WorldWideScience

Sample records for aided design cad

  1. An Analysis of Computer Aided Design (CAD) Packages Used at MSFC for the Recent Initiative to Integrate Engineering Activities

    Science.gov (United States)

    Smith, Leigh M.; Parker, Nelson C. (Technical Monitor)

    2002-01-01

    This paper analyzes the use of Computer Aided Design (CAD) packages at NASA's Marshall Space Flight Center (MSFC). It examines the effectiveness of recent efforts to standardize CAD practices across MSFC engineering activities. An assessment of the roles played by management, designers, analysts, and manufacturers in this initiative will be explored. Finally, solutions are presented for better integration of CAD across MSFC in the future.

  2. Computer Aided Design (CAD) of a Multi-component Condenser

    OpenAIRE

    Bandyopadhyay, S.; Alam, M. S.; Agrawal, V. K.; Wasewar, K.L.

    2007-01-01

    In the case of multi-component condensation the ‘condensing vapour contains a mixture of components having different boiling points, which condense over a wide temperature range, either in presence of or absence of non-condensing material. In this work, a design algorithm for the condensation of a multi-component vapour mixture in shell side of a shell and tube vertical condenser has been developed using Bell and Ghaly’s method. Based on this algorithm, an in-house computer code has been deve...

  3. Using the Continuum of Design Modelling Techniques to Aid the Development of CAD Modeling Skills in First Year Industrial Design Students

    Science.gov (United States)

    Storer, I. J.; Campbell, R. I.

    2012-01-01

    Industrial Designers need to understand and command a number of modelling techniques to communicate their ideas to themselves and others. Verbal explanations, sketches, engineering drawings, computer aided design (CAD) models and physical prototypes are the most commonly used communication techniques. Within design, unlike some disciplines,…

  4. A CAD/CAM interface for computer-aided design of cams

    OpenAIRE

    Gandhi, Ashit R.

    1985-01-01

    The purpose of this thesis is to provide a complete package for the design and three dimensional modeling display of cams. The software produced as a part of this work will operate as a module of CADAM to produce cam designs and enter the resulting cam as a CAD model and produce the graphical display of the cam. In addition to the introductory material, this thesis is divided into four sections. The section on the graphics packages used in this thesis includes a b...

  5. It is easier with CAD/CAM. Designing flow machines for air conditioning technique with computer-aided methods; Mit CAD/CAM geht`s besser. Stroemungsmaschinen fuer die Klimatechnik anwendungsspezifisch auslegen mit Hilfe computerunterstuetzter Methoden

    Energy Technology Data Exchange (ETDEWEB)

    Carolus, T. [Universitaet-Gesamthochschule Siegen (Germany). Inst. fuer Fluid- und Thermodynamik; Homrighausen, B. [Universitaet-Gesamthochschule Siegen (Germany). Inst. fuer Fluid- und Thermodynamik; Beiler, M. [Universitaet-Gesamthochschule Siegen (Germany). Inst. fuer Fluid- und Thermodynamik

    1994-08-08

    One requires many flow machines for circulation and delivery in air conditioning and ventilation technique. Computer-aided design and manufacture (CAD/CAM) and computational fluid dynamics (CFD) are now important aids for queck and reliable development of advanced flow machines. Conventional design processes supply the raw data of the generally very complicated geometry. (orig.) [Deutsch] In der Klima- und Lueftungstechnik benoetigt man zahlreiche Stroemungsmaschinen zum Umwaelzen und Foerdern. CAD/CAM (Computer aided design und manufacture) und CFD (Computational fluid dynamics) sind heute wichtige Hilfsmittel zur schnellen und zuverlaessigen Entwicklung fortschrittlicher Stroemungsmaschinen. Klassische Auslegeverfahren liefern die Rohdaten der allgemein sehr komplizierten Geometrie. (orig.)

  6. Modification to the Monte N-Particle (MCNP) Visual Editor (MCNPVised) to read in Computer Aided Design (CAD) files

    International Nuclear Information System (INIS)

    Monte Carlo N-Particle Transport Code (MCNP) (Reference 1) is the code of choice for doing complex neutron/photon/electron transport calculations for the nuclear industry and research institutions. The Visual Editor for Monte Carlo N-Particle (References 2 to 11) is recognized internationally as the best code for visually creating and graphically displaying input files for MCNP. The work performed in this grant enhanced the capabilities of the MCNP Visual Editor to allow it to read in a 2D Computer Aided Design (CAD) file, allowing the user to modify and view the 2D CAD file and then electronically generate a valid MCNP input geometry with a user specified axial extent

  7. Modification to the Monte Carlo N-Particle (MCNP) Visual Editor (MCNPVised) to Read in Computer Aided Design (CAD) Files

    International Nuclear Information System (INIS)

    Monte Carlo N-Particle Transport Code (MCNP) is the code of choice for doing complex neutron/photon/electron transport calculations for the nuclear industry and research institutions. The Visual Editor for Monte Carlo N-Particle is internationally recognized as the best code for visually creating and graphically displaying input files for MCNP. The work performed in this grant was used to enhance the capabilities of the MCNP Visual Editor to allow it to read in both 2D and 3D Computer Aided Design (CAD) files, allowing the user to electronically generate a valid MCNP input geometry

  8. Modification to the Monte Carlo N-Particle (MCNP) Visual Editor (MCNPVised) to Read in Computer Aided Design (CAD) Files

    Energy Technology Data Exchange (ETDEWEB)

    Randolph Schwarz; Leland L. Carter; Alysia Schwarz

    2005-08-23

    Monte Carlo N-Particle Transport Code (MCNP) is the code of choice for doing complex neutron/photon/electron transport calculations for the nuclear industry and research institutions. The Visual Editor for Monte Carlo N-Particle is internationally recognized as the best code for visually creating and graphically displaying input files for MCNP. The work performed in this grant was used to enhance the capabilities of the MCNP Visual Editor to allow it to read in both 2D and 3D Computer Aided Design (CAD) files, allowing the user to electronically generate a valid MCNP input geometry.

  9. CAD/CAM (Computer Aided Design/Computer Aided Manufacture). A Brief Guide to Materials in the Library of Congress.

    Science.gov (United States)

    Havas, George D.

    This brief guide to materials in the Library of Congress (LC) on computer aided design and/or computer aided manufacturing lists reference materials and other information sources under 13 headings: (1) brief introductions; (2) LC subject headings used for such materials; (3) textbooks; (4) additional titles; (5) glossaries and handbooks; (6)…

  10. Criterios para Seleccionar Sistemas de Diseño y Manufactura Asistidos por Computadora (CAD/CAM Criteria for the Selection of Computer Aided Design and Manufacturing Systems (CAD/CAM

    Directory of Open Access Journals (Sweden)

    R.R. Martínez

    2004-01-01

    Full Text Available Este estudio tiene como objetivo presentar en forma clara los principios fundamentales que se requieren para tener un criterio sobre las bondades e inconvenientes de los sistemas Diseño y Manufactura Asistidos por Computadora (CAD/CAM. La inquietud nació por algunos problemas presentados en la primera adquisición de un sistema de CAD/CAM. Se adaptó a una máquina de Control Numérico por Computadora (CNC las dos modalidades de CAM, el primero con el sistema de CAD integrado y la otra con interacción en AutoCAD. Del análisis se determinó la indiferencia de usar un software de CAD desarrollado por la misma compañía del CAM. El resultado de estos experimentos y observaciones proporciona una herramienta fundamental para seleccionar un sistema de CAD/CAM eficienteThe objective of this study was to present in clear form the fundamental principles required to obtain a criterion of the advantages and disadvantages of computer aided design and manufacturing systems (CAD/CAM. The idea for setting these selection criteria were obtained during the initial acquisition of a CAD/CAM system. A Numerical Control by Computer (CNC machine was adapted to two modalities of CAM, the first with an integrated CAD system and another with AutoCAD interaction. From the analysis it was determined that it was immaterial whether or not the use of CAD software was from the same company that produced the CAM software. The results of these experiments and observations provide a fundamental tool for selecting an efficient CAD/CAM system

  11. SPLPKG WFCMPR WFAPPX, Wilson-Fowler Spline Generator for Computer Aided Design And Manufacturing (CAD/CAM) Systems

    International Nuclear Information System (INIS)

    1 - Description of program or function: The three programs SPLPKG, WFCMPR, and WFAPPX provide the capability for interactively generating, comparing and approximating Wilson-Fowler Splines. The Wilson-Fowler spline is widely used in Computer Aided Design and Manufacturing (CAD/CAM) systems. It is favored for many applications because it produces a smooth, low curvature fit to planar data points. Program SPLPKG generates a Wilson-Fowler spline passing through given nodes (with given end conditions) and also generates a piecewise linear approximation to that spline within a user-defined tolerance. The program may be used to generate a 'desired' spline against which to compare other Splines generated by CAD/CAM systems. It may also be used to generate an acceptable approximation to a desired spline in the event that an acceptable spline cannot be generated by the receiving CAD/CAM system. SPLPKG writes an IGES file of points evaluated on the spline and/or a file containing the spline description. Program WFCMPR computes the maximum difference between two Wilson-Fowler Splines and may be used to verify the spline recomputed by a receiving system. It compares two Wilson-Fowler Splines with common nodes and reports the maximum distance between curves (measured perpendicular to segments) and the maximum difference of their tangents (or normals), both computed along the entire length of the Splines. Program WFAPPX computes the maximum difference between a Wilson- Fowler spline and a piecewise linear curve. It may be used to accept or reject a proposed approximation to a desired Wilson-Fowler spline, even if the origin of the approximation is unknown. The maximum deviation between these two curves, and the parameter value on the spline where it occurs are reported. 2 - Restrictions on the complexity of the problem - Maxima of: 1600 evaluation points (SPLPKG), 1000 evaluation points (WFAPPX), 1000 linear curve breakpoints (WFAPPX), 100 spline Nodes

  12. Computer-aided-diagnosis (CAD) for colposcopy

    Science.gov (United States)

    Lange, Holger; Ferris, Daron G.

    2005-04-01

    Uterine cervical cancer is the second most common cancer among women worldwide. Colposcopy is a diagnostic method, whereby a physician (colposcopist) visually inspects the lower genital tract (cervix, vulva and vagina), with special emphasis on the subjective appearance of metaplastic epithelium comprising the transformation zone on the cervix. Cervical cancer precursor lesions and invasive cancer exhibit certain distinctly abnormal morphologic features. Lesion characteristics such as margin; color or opacity; blood vessel caliber, intercapillary spacing and distribution; and contour are considered by colposcopists to derive a clinical diagnosis. Clinicians and academia have suggested and shown proof of concept that automated image analysis of cervical imagery can be used for cervical cancer screening and diagnosis, having the potential to have a direct impact on improving women"s health care and reducing associated costs. STI Medical Systems is developing a Computer-Aided-Diagnosis (CAD) system for colposcopy -- ColpoCAD. At the heart of ColpoCAD is a complex multi-sensor, multi-data and multi-feature image analysis system. A functional description is presented of the envisioned ColpoCAD system, broken down into: Modality Data Management System, Image Enhancement, Feature Extraction, Reference Database, and Diagnosis and directed Biopsies. The system design and development process of the image analysis system is outlined. The system design provides a modular and open architecture built on feature based processing. The core feature set includes the visual features used by colposcopists. This feature set can be extended to include new features introduced by new instrument technologies, like fluorescence and impedance, and any other plausible feature that can be extracted from the cervical data. Preliminary results of our research on detecting the three most important features: blood vessel structures, acetowhite regions and lesion margins are shown. As this is a new

  13. Structural design by CAD system

    International Nuclear Information System (INIS)

    CAD systems are now widely used for the design of many engineering problems involving static, dynamic and thermal stress analyses of structures. In order to apply CAD systems to the structural analysis and design, the function of hardwares and softwares necessary for the CAD systems must be understood. The purpose of this study is to introduce the basic elements that are indispensible in the application of CAD systems to the analysis and design of structures and to give a thorough understanding of CAD systems to design engineers, so as to participate in the further technological developments of CAD systems. Due to the complexity and variety of the shape and size of the nowa-days structures, the need of new design technologies is growing for more efficient, accurate and economical design of structures. The application of CAD systems to structural engineering fields enables to improve structural engineering analysis and design technologies and also to obtain the standardization of the design process. An active introduction of rapidly developing CAD technologies will contribute to analyzing and designing structures more efficiently and reliably. Based on this report of the current status of the application of CAD systems to the structural analysis and design, the next goal is to develop the expert system which enables to perform the design of structures by CAD systems from the preliminary conceptual design to the final detail drawings automatically. (Author)

  14. Development of problem-oriented software packages for numerical studies and computer-aided design (CAD) of gyrotrons

    Science.gov (United States)

    Damyanova, M.; Sabchevski, S.; Zhelyazkov, I.; Vasileva, E.; Balabanova, E.; Dankov, P.; Malinov, P.

    2016-03-01

    Gyrotrons are the most powerful sources of coherent CW (continuous wave) radiation in the frequency range situated between the long-wavelength edge of the infrared light (far-infrared region) and the microwaves, i.e., in the region of the electromagnetic spectrum which is usually called the THz-gap (or T-gap), since the output power of other devices (e.g., solid-state oscillators) operating in this interval is by several orders of magnitude lower. In the recent years, the unique capabilities of the sub-THz and THz gyrotrons have opened the road to many novel and future prospective applications in various physical studies and advanced high-power terahertz technologies. In this paper, we present the current status and functionality of the problem-oriented software packages (most notably GYROSIM and GYREOSS) used for numerical studies, computer-aided design (CAD) and optimization of gyrotrons for diverse applications. They consist of a hierarchy of codes specialized to modelling and simulation of different subsystems of the gyrotrons (EOS, resonant cavity, etc.) and are based on adequate physical models, efficient numerical methods and algorithms.

  15. Computer Aided Product Service Systems Design: Service CAD and Its integration with Life Cycle Simulation

    NARCIS (Netherlands)

    Komoto, H.

    2009-01-01

    Integration of product design into service design, or vice versa, is considered to bring more efficient and effective value addition. Besides EcoDesign tools and methods, a methodology to design such an integration of products and services from a systemic perspective, or product-service systems (PSS

  16. A Case Study in CAD Design Automation

    Science.gov (United States)

    Lowe, Andrew G.; Hartman, Nathan W.

    2011-01-01

    Computer-aided design (CAD) software and other product life-cycle management (PLM) tools have become ubiquitous in industry during the past 20 years. Over this time they have continuously evolved, becoming programs with enormous capabilities, but the companies that use them have not evolved their design practices at the same rate. Due to the…

  17. Design of pharmaceutical tablet formulation for a low water soluble drug : search for the critical concentration of starch based disintegrant applying percolation theory and F-CAD (Formulation-Computer Aided Design)

    OpenAIRE

    Kimura, Go

    2012-01-01

    The topic of this PhD work is to search the critical concentration of starch based disintegrant applying percolation theory and F-CAD (Formulation-Computer Aided Design) in order to design a pharmaceutical tablet formulation for a low water soluble drug. Critical concentration of maize starch (MS) for a ternary mefenamic acid (MA) tablet formulation with respect to a minimum disintegration time is investigated. Additionally implemented application of F-CAD to compute the disintegration time o...

  18. CAD Computer Aided Design

    DEFF Research Database (Denmark)

    Sigrist, F.(red.)

    Publikationen indeholder foredrag, oplæg og sammenfatning af diskussionerne på et seminar, der havde til formål at informere byggeriets parter om udviklingen omkring brug af edb i byggesektoren....

  19. Improving the radiologist–CAD interaction: designing for appropriate trust

    International Nuclear Information System (INIS)

    Computer-aided diagnosis (CAD) has great potential to improve radiologists' diagnostic performance. However, the reported performance of the radiologist–CAD team is lower than what might be expected based on the performance of the radiologist and the CAD system in isolation. This indicates that the interaction between radiologists and the CAD system is not optimal. An important factor in the interaction between humans and automated aids (such as CAD) is trust. Suboptimal performance of the human–automation team is often caused by an inappropriate level of trust in the automation. In this review, we examine the role of trust in the radiologist–CAD interaction and suggest ways to improve the output of the CAD system so that it allows radiologists to calibrate their trust in the CAD system more effectively. Observer studies of the CAD systems show that radiologists often have an inappropriate level of trust in the CAD system. They sometimes under-trust CAD, thereby reducing its potential benefits, and sometimes over-trust it, leading to diagnostic errors they would not have made without CAD. Based on the literature on trust in human–automation interaction and the results of CAD observer studies, we have identified four ways to improve the output of CAD so that it allows radiologists to form a more appropriate level of trust in CAD. Designing CAD systems for appropriate trust is important and can improve the performance of the radiologist–CAD team. Future CAD research and development should acknowledge the importance of the radiologist–CAD interaction, and specifically the role of trust therein, in order to create the perfect artificial partner for the radiologist. This review focuses on the role of trust in the radiologist–CAD interaction. The aim of the review is to encourage CAD developers to design for appropriate trust and thereby improve the performance of the radiologist–CAD team. - Highlights: • Radiologists often have an inappropriate

  20. Present state of computer-aided diagnosis (CAD) development

    International Nuclear Information System (INIS)

    Topics of computer-aided detection (CAD) are reviewed. Commercially available, Food and Drug Administration (FDA)-approved CAD systems are for fields of breast cancer (mammography), chest (flat X-ray and CT imaging) and colon (polyp detection). In Japan, only mammography CAD is approved. Efficacy of CAD is controversial, for which reliable database is important, and its construction is under development in various medical fields. Digitalized image is now popularized, which conceivably leads to improve the cost-effectiveness of diagnosis with CAD. For incentive, approval for health insurance would be the case as seen in the increased CAD sale by R2 Technology Co., and MHLW actually assists facilities to introduce the reading-aid system of mammography by sharing a half of its cost. There are 2 big projects for CAD study supported by MECSST, which the author concerns. One is the development of diagnostic aid for the multi-dimensional medical images where the multi-organ, multi-disease CAD system is considered. The other involves the CAD in brain MRI, in breast US and in eyeground picture. It is not in so far future for patients and doctors to fully enjoy the benefit of CAD. (R.T.)

  1. A Multidisciplinary Research Team Approach to Computer-Aided Drafting (CAD) System Selection. Final Report.

    Science.gov (United States)

    Franken, Ken; And Others

    A multidisciplinary research team was assembled to review existing computer-aided drafting (CAD) systems for the purpose of enabling staff in the Design Drafting Department at Linn Technical College (Missouri) to select the best system out of the many CAD systems in existence. During the initial stage of the evaluation project, researchers…

  2. CAD Skills Increased through Multicultural Design Project

    Science.gov (United States)

    Clemons, Stephanie

    2006-01-01

    This article discusses how students in a college-entry-level CAD course researched four generations of their family histories and documented cultural and symbolic influences within their family backgrounds. AutoCAD software was then used to manipulate those cultural and symbolic images to create the design for a multicultural area rug. AutoCAD was…

  3. CAD/CAM: improved design quality, increased productivity

    Energy Technology Data Exchange (ETDEWEB)

    Evans, D. E.; England, J.

    1980-01-01

    Maintaining productivity levels while assuring the quality of engineering products grows increasingly more difficult and costly for industries such as the energy industry which are heavily committed to product design. The man/machine interface made possible through the development of computer-aided design/computer-aided manufacturing (CAD/CAM) technology can be applied to the design process as a tool for increased control to assure the quality of the final engineering product. The quality-control aspects of CAD/CAM technology are addressed in this presentation.

  4. CAD optimization design of exact mechanism

    International Nuclear Information System (INIS)

    Based on the study of the 'laser light magnifier bearing device', the CAD optimization-design technology of exact mechanism is discussed and the design of 'magnifier bearing device' by using CAD software 'PRO/E', CAE software 'ANSYS' and engineering drawing software 'AUTOCAD' as the optimization-design tool is accomplished

  5. TFTR Bumper Limiter and Protective Plate (BL/PP) graphite tile computer aided design and manufacture (CAD/CAM)

    International Nuclear Information System (INIS)

    The Bumper Limiter/Protective Plate (BL/PP) project was part of McDonnell Douglas Astronautics Company's (MDAC's) diversification effort into Fusion Energy. MDAC planned to layout and fabricate protective liners for the inside walls of the Tokamak Fusion Test Reactor (TFTR). The conceptual design was given: water-cooled Inconel backing plates covered with high purity graphite tiles. This paper describes how the computer was used to design, fabricate, and inspect the liners and, in particular, the tiles

  6. Collaborative Design in PDM/3D CAD Integrated Environment

    Institute of Scientific and Technical Information of China (English)

    CHEN Zhuoning; ZHANG Fen; YAN Xiaoguang; BIN Hongzan

    2006-01-01

    Some key issues in supporting collaborative design in product data management (PDM) system and 3D computer aided design(CAD) system integrated environment are analyzed. The general architecture of the integrated environment is divided into five tiers and employs the transparently integrated mode, with the mode, function calling and information exchanging among independent PDM and CAD processes are carried out via message translation /parse approach.Product layout feature(PLF ) model definition is presented,PLF model is used to represent design intention at the preliminary design phase. The collaborative design methodology employing the PLF model in PDM/3D CAD integrated environment is analyzed. The design methodology can speed up the design process, reduce the investment and improve the product quality.

  7. Computer aided design (CAD) for electronics improvement of the nuclear channels of TRIGA Mark III reactor of the ININ

    International Nuclear Information System (INIS)

    The 4 neutron measurement channels of the digital control console (CCD) of the TRIGA Mark III reactor (RTMIII) of the ININ, its were designed and built with the corresponding Quality Guarantee program, being achieved the one licensing to replace the old console. With the time they were carried out some changes to improve and to not solve some problems detected in the tests, verification and validation, requiring to modify the circuits originally designed. In this work the corrective actions carried out to eliminate the Non Conformity generated by these problems, being mentioned the advantages of using modern tools, as the software applied to the Attended Engineering by Computer, and those obtained results are presented. (Author)

  8. Computer-aided engineering: the step beyond CAD/CAM

    Energy Technology Data Exchange (ETDEWEB)

    Hatfield, L.; Trost, S.R.; O' Brien, D.W.; Pomernacki, C.L.

    1981-11-06

    At Lawrence Livermore National Laboratory, the need for increased engineering productivity, coupled with increasingly difficult engineering problems, presents a significant challenge. Advances in computer technology coupled with successful CAD/CAM experiences suggest that computer-aided engineering (CAE) will help meet this challenge. Requirements for a CAE system are developed, a CAE system plan is outlined, and some remaining problem areas are discussed.

  9. Improving the radiologist-CAD interaction: designing for appropriate trust

    NARCIS (Netherlands)

    Jorritsma, W; Cnossen, F; van Ooijen, P M A

    2015-01-01

    Computer-aided diagnosis (CAD) has great potential to improve radiologists' diagnostic performance. However, the reported performance of the radiologist-CAD team is lower than what might be expected based on the performance of the radiologist and the CAD system in isolation. This indicates that the

  10. Integrated computer-aided design in automotive development development processes, geometric fundamentals, methods of CAD, knowledge-based engineering data management

    CERN Document Server

    Mario, Hirz; Gfrerrer, Anton; Lang, Johann

    2013-01-01

    The automotive industry faces constant pressure to reduce development costs and time while still increasing vehicle quality. To meet this challenge, engineers and researchers in both science and industry are developing effective strategies and flexible tools by enhancing and further integrating powerful, computer-aided design technology. This book provides a valuable overview of the development tools and methods of today and tomorrow. It is targeted not only towards professional project and design engineers, but also to students and to anyone who is interested in state-of-the-art computer-aided development. The book begins with an overview of automotive development processes and the principles of virtual product development. Focusing on computer-aided design, a comprehensive outline of the fundamentals of geometry representation provides a deeper insight into the mathematical techniques used to describe and model geometrical elements. The book then explores the link between the demands of integrated design pr...

  11. Contribution of CAD and PLM Research Reactors Design and Construction

    Energy Technology Data Exchange (ETDEWEB)

    Bonnetain, Xavier [AREVA TA, Paris (France)

    2013-07-01

    As all the reactors, the main stakes in the engineering of design and construction of the research reactors consist of the management and sharing of the technical data, the functional, physical and contractual interfaces data between the various contributors on the whole designs and construction cycle project. For 40 years, AREVA TA designs and builds reactors. Computer Aided Design (CAD) tools were introduced for 30 years into the engineering processes of AREVA TA, completed for 15 years by Product Lifecycle Management (PLM) tools. For 15 years AREVA TA pursues the integration since the feasibility of its newest Information Technologies (IT). In the first part, the paper presents IN the second part, the paper presents how the schematics and CAD tools support the engineering processes during the different phases of the project. CAD was used during the studies and now supports the management of the layout and design studies, including interfaces between suppliers, up to the constitution of the as built CAD mock-up. In the third part, the paper presents the relations between the various tools and the PLM solution implemented by AREVA TA to ensure the consistency between all tools and data for the benefit of the project.

  12. Augmented Reality Computer-Aided Drawing (AR-CAD)

    OpenAIRE

    ECT Team, Purdue

    2007-01-01

    While Virtual Reality (VR) replaces the entire real world with virtual images, Augmented Reality (AR) superimposes virtual images on the real world. Augmented Reality (a most useful form of Mixed Reality (MR)) is a popular concept for using computers to overlay virtual information onto a view of the real world. In 2000, Phillip Dunston then at the University of Washington in Seattle and his research team presented the initial concept of AR CAD developed for supporting design and construction....

  13. Role of computer aided detection (CAD) integration: case study with meniscal and articular cartilage CAD applications

    Science.gov (United States)

    Safdar, Nabile; Ramakrishna, Bharath; Saiprasad, Ganesh; Siddiqui, Khan; Siegel, Eliot

    2008-03-01

    Knee-related injuries involving the meniscal or articular cartilage are common and require accurate diagnosis and surgical intervention when appropriate. With proper techniques and experience, confidence in detection of meniscal tears and articular cartilage abnormalities can be quite high. However, for radiologists without musculoskeletal training, diagnosis of such abnormalities can be challenging. In this paper, the potential of improving diagnosis through integration of computer-aided detection (CAD) algorithms for automatic detection of meniscal tears and articular cartilage injuries of the knees is studied. An integrated approach in which the results of algorithms evaluating either meniscal tears or articular cartilage injuries provide feedback to each other is believed to improve the diagnostic accuracy of the individual CAD algorithms due to the known association between abnormalities in these distinct anatomic structures. The correlation between meniscal tears and articular cartilage injuries is exploited to improve the final diagnostic results of the individual algorithms. Preliminary results from the integrated application are encouraging and more comprehensive tests are being planned.

  14. Design, Optimization and Development of Assemblies for Continuous Casting Facility using Techniques CAD, CAM and CAE

    Directory of Open Access Journals (Sweden)

    Marius Tufoi

    2011-10-01

    Full Text Available This work presents design methods, optimization and realization of mechanical for continuous casting plants using modern techniques: CAD,CAM and CAE. These current techniques refer to techniques CAD (Computer-Aided Design, CAE (Computer-Aided Engineering and CAM (Computer-Aided Manufacturing. Techniques mentioned above are areas of information technology aimed at helping engineering a variety of areas to be faster, more efficient and creative. A synthesis of the works published in the last 15 years shows that computer aided design and manufacturing are two areas which have developed simultaneously being treated in a common vision based on the natural links that exist between the activities of design and production or manufacturing. The paper will present a practical case application of techniques CAD, CAE and CAM.

  15. Design strategy of intelligent CAD for welding positioner scheme design

    Institute of Scientific and Technical Information of China (English)

    林三宝; 杨春利; 吴林; 黎明

    2002-01-01

    Traditional CAD technique does not support the design processes such as function definition, conceptual design and preliminary design, which are most creative and play significant roles on the design quality. Because scheme design has close relationship with product structure, performance and technology cost, it is important for applying the intelligent CAD of scheme design to improve the quality and competitive level of the product. The definition and function of welding positioner are discussed in this paper. The new definition of welding positioner extends the research scope of welding positioner to welding fixture and welding positioning motion mechanism. The design process of welding fixture and positioning motion system is described, and the cased-based and knowledge-based design strategy of welding positioner scheme design intelligent CAD is then put forward, which lays foundation for developing proto-type system of welding positioner scheme design.

  16. A CAD (Classroom Assessment Design) of a Computer Programming Course

    Science.gov (United States)

    Hawi, Nazir S.

    2012-01-01

    This paper presents a CAD (classroom assessment design) of an entry-level undergraduate computer programming course "Computer Programming I". CAD has been the product of a long experience in teaching computer programming courses including teaching "Computer Programming I" 22 times. Each semester, CAD is evaluated and modified for the subsequent…

  17. Computer-aided determination of occlusal contact points for dental 3-D CAD.

    Science.gov (United States)

    Maruyama, Tomoaki; Nakamura, Yasuo; Hayashi, Toyohiko; Kato, Kazumasa

    2006-05-01

    Present dental CAD systems enable us to design functional occlusal tooth surfaces which harmonize with the patient's stomatognathic function. In order to avoid occlusal interferences during tooth excursions, currently available systems usually use the patient's functional occlusal impressions for the design of occlusal contact points. Previous interfere-free design, however, has been done on a trial-and-error basis by using visual inspection. To improve this time-consuming procedure, this paper proposes a computer-aided system for assisting in the determination of the occlusal contact points by visualizing the appropriate regions of the opposing surface. The system can designate such regions from data of the opposing occlusal surfaces and their relative movements can be simulated by using a virtual articulator. Experiments for designing the crown of a lower first molar demonstrated that all contact points selected within the designated regions completely satisfied the required contact or separation during tooth excursions, confirming the effectiveness of our computer-aided procedure.

  18. CAD-CAM printed circuit board design

    Science.gov (United States)

    Agy, W. E.

    A step-by-step procedure for a printed circuit design achieved by CAD is presented. The operator at the interactive CRT station moves a stylus across a graphics tablet and intersperses commands which result in computer-generated pictorial forms on the screen that were drawn on the pad. Standard symbols are used for commands allowing, for instance, connections to be made of specific types in certain locations, which can be automatically edited from a materials list. An entire network of drawn lines can be referenced by a signal name for recall, and a finished circuit schematic can be checked for designs rules compliance, including fault reporting in terms of designator/pin number. A map may be present delineating the boundaries of the circuitry area, and previously completed circuitry segments can be recalled for piece-by-piece assembly of the circuit board.

  19. Radiation transport analysis with the aid of CAD/CAM

    International Nuclear Information System (INIS)

    The determination of radiation exposure to sensitive parts in spacecraft involves complex shielding configurations and multi-directional exposures. Ray tracing is commonly used to determine shielding along different directions for transport calculations and dose conversions. Ray tracing requires geometric modeling of the spacecraft, structures, equipment and enclosures. Modeling by manual procedures is inefficient and slow. Combinatorial geometry codes are a substantial improvement over manual procedures but modeling a spacecraft and its contents can take many man months; and still involves many approximations. The increasing use of CAD/CAM in engineering and design results in the convenient accessibility of geometric modeling data. A CAD/CAM system, CADAM, was used to develop an ancillary program which provides one-dimensional ray trace information from CADAM models. The resultant ray trace information is used in subsequent transport analysis on a DEC computer. The result is a timesavings of man-months, by utilizing an existing data base and an increase in accuracy by using up-to-date geometrical information

  20. 3D CAD for concept design - a case study

    OpenAIRE

    Mandal, S. K.; P.K. Maji; Karmakar, S

    2013-01-01

    Generally for any new design initially a concept layout in 2D CAD is generated. But sometimes if the geometry of product becomes complicated, then 3D CAD model is preferred. Because 3D CAD model can give us a complete all side view at a time like a real product, but in a virtual world. The present case study will show the utilization of 3D CAD at the concept design stage of a complicated shaped product for a new system. This will also give an idea about cost and time comparison. Thus this pap...

  1. Complete PCB design using OrCAD capture and layout

    CERN Document Server

    Mitzner, Kraig

    2011-01-01

    This book provides instruction on how to use the OrCAD design suite to design and manufacture printed circuit boards. The book is written for both students and practicing engineers who need a quick tutorial on how to use the software and who need in-depth knowledge of the capabilities and limitations of the software package. There are two goals the book aims to reach:The primary goal is to show the reader how to design a PCB using OrCAD Capture and OrCAD Layout. Capture is used to build the schematic diagram of the circuit, and Layout is used to design the circuit board so that

  2. CAD/CAM导板在上颌后牙种植修复中的临床应用研究%Clinical application research of the computer aided design and computer aided manufacture template for implants placement in maxillary posterior area

    Institute of Scientific and Technical Information of China (English)

    王宏远; 缪羽; 安婧薇; 曹庆堂

    2013-01-01

    Objective:To evaluate the location accuracy of the computer-aided design and computer-aided manufacture (CAD/CAM)implant template based on CT data for dental implants placement.Methods:Based on the maxillary CT data from 16 patients with 20 missing molars,the CAD/CAM implant templates were designed and fabricated.Totally,20 implants were placed in the maxillary posterior region under the guidance of CAD/CAM implant templates.The CT data were regained after the dental implant placement.All the pre-and post-operative CT were registered by the point to point method,and the deviation between actual and virtual implants was measured to assess the location accuracy of the CAD/CAM templates.Results:With the aid of CAD/CAM implant template,the average deviations of the position at the tail of the implant,at the tip of the implant and the projected deviation of angle were(1.03± 0.06)mm,(1.19± 0.02)mm,and 0.73°± 0.64°,respectively,and the deviations of the position at the bucco-palatal,disto-mesial,vertical direction were (0.53± 0.04)mm,(0.42± 0.03)mm,(0.30± 0.04)mm,respectively.Based on the statistic test results,we found that there was no difference between the deviation value of bucco-palatal and vertical direction at the tip of the implant,but the deviation value of the disto-mesial was more obvious than others with significant differences.And there was no difference between the deviation value of bucco-palatal,disto-mesial,vertical direction at the tip of implant respectively.Conclusion:The higher location accuracy could be obtained under the guidance of CAD/CAM implant templates for dental implant placement.Relatively,implant deviation of angle after implanting was affected by implant template obviously.And in three-dimensional the deviation at the disto-mesial direction of implant have the more influence to the whole deviation at the tip of the implant.%目的:评价基于临床CT数据的计算机辅助设计和制造(computer aided design/computer aided

  3. 3D CAD for concept design - a case study

    Directory of Open Access Journals (Sweden)

    S.K. Mandal

    2013-07-01

    Full Text Available Generally for any new design initially a concept layout in 2D CAD is generated. But sometimes if the geometry of product becomes complicated, then 3D CAD model is preferred. Because 3D CAD model can give us a complete all side view at a time like a real product, but in a virtual world. The present case study will show the utilization of 3D CAD at the concept design stage of a complicated shaped product for a new system. This will also give an idea about cost and time comparison. Thus this paper will describe about the importance of 3D CAD tools for product development. 

  4. Computer-Aided Business Model Design

    OpenAIRE

    Fritscher B.

    2014-01-01

    There is a lack of dedicated tools for business model design at a strategic level. However, in today's economic world the need to be able to quickly reinvent a company's business model is essential to stay competitive. This research focused on identifying the functionalities that are necessary in a computer-aided design (CAD) tool for the design of business models in a strategic context. Using design science research methodology a series of techniques and prototypes have been designed and eva...

  5. Computer Aided Design Tools for Extreme Environment Electronics Project

    Data.gov (United States)

    National Aeronautics and Space Administration — This project aims to provide Computer Aided Design (CAD) tools for radiation-tolerant, wide-temperature-range digital, analog, mixed-signal, and radio-frequency...

  6. Adaptive subsystem aided design synthesis units REA on minicomputers

    Directory of Open Access Journals (Sweden)

    Yu. F. Zin'kovskii

    1986-04-01

    Full Text Available Questions of construction sub-aided design CAD integrated electronics units based on the principles of adaptation and self-tuning software and mathematical software for solving a specific problem.

  7. CAD/CAM at the design stage

    Energy Technology Data Exchange (ETDEWEB)

    Masur, W.

    1989-01-01

    The introduction of CAD/CAM requires a thorough analysis of the manufacturing process in order to be able to single out those operations and partial complexes which are found suited for CAD/CAM use and are also expected to bring about the streamlining effects desired. Further it has to be analysed what partial jobs can be done by existing and planned hardware and software as well as by the skilled labour available or to be made available yet. The organization of the relations between program developer and program user and the required training measures has to be fixed in time and clearly by the managerial staff.

  8. CAD system for footwear design based on whole real 3D data of last surface

    Science.gov (United States)

    Song, Wanzhong; Su, Xianyu

    2000-10-01

    Two major parts of application of CAD in footwear design are studied: the development of last surface; computer-aided design of planar shoe-template. A new quasi-experiential development algorithm of last surface based on triangulation approximation is presented. This development algorithm consumes less time and does not need any interactive operation for precisely development compared with other development algorithm of last surface. Based on this algorithm, a software, SHOEMAKERTM, which contains computer aided automatic measurement, automatic development of last surface and computer aide design of shoe-template has been developed.

  9. Multifunctional facades - design optimisation with CAD; Multifunktionale Fassaden - Effektive Auslegung durch CAD-Einsatz

    Energy Technology Data Exchange (ETDEWEB)

    Viotto, M. [Institut fuer Solare Energieversorgungstechnik (ISET), Kassel (Germany). Abt. fuer Anlagen- und Messtechnik

    1998-02-01

    The energetically optimal design of PV facades requires the consideration of many technical conditions (different elevations/orientations of modules; shading possibility; high and different module temperatures). It also requires the interface with architecture, civil and electrical engineering. To support this planning process, the software program PV-CAD was developed which rapidly calculates energy yield under conditions of inhomogeneous irradiance, shading, thermal behaviour of modules and electrical layout. PV-CAD is compatible with other civil and electrical engineering CAD programs and incorporates extensive databases (weather data; modules and inverter types). (orig.) [Deutsch] Fuer optimalen Energieertrag sind zahlreiche technische Randbedingungen bei der Auslegung einer Photovoltaik (PV)-Fassade zu beruecksichtigen (unterschiedliche Ausrichtungen/Neigungen der Module; moegliche Teilabschattung; hoehere und unterschiedliche Betriebstemperaturen). Installation und Betrieb einer PV-Fassade erfordern die Abstimmung zwischen Architektur, Bauwesen und Elektrotechnik. Zur Unterstuetzung der Planer wurde das Programm PV-CAD entwickelt, das den Energieertrag unter Beruecksichtigung von inhomogener Einstrahlung und Abschattung, Temperaturverhalten der Fassadenmodule sowie unterschiedlichen elektrischen Anlagenkonzepten schnell ermittelt; es fuegt sich nahtlos in CAD-Arbeitsumgebungen ein. (orig.)

  10. Multi-Volume CAD Modeling for Heterogeneous Object Design and Fabrication

    Institute of Scientific and Technical Information of China (English)

    SUN Wei

    2000-01-01

    he current computer-aided technologies in design and product development, the evolution of CAD modeling, and a framework of multi-volume CAD modeling system for heterogeneous object design and fabrication are presented in this paper.The multi-volume CAD modeling system is presented based on nonmanifold topological elements. Material identifications are defined as design attributes introduced along with geometric and topological information at the design stage. Extended Euler operation and reasoning Boolean operations for merging and extraction are executed according to the associated material identifications in the developed multi-volume modeling system for heterogeneous object.An application example and a pseudo-processing algorithm for prototyping of heterogeneous structure through solid free-form fabrication are also described.1

  11. ROCK-CAD - computer aided geological modelling system

    International Nuclear Information System (INIS)

    The study discusses surface and solid modelling methods, their use and interfacing with geodata. Application software named ROCK-CAD suitable for geological bedrock modelling has been developed with support from Teollisuuden Voima Oy (TVO). It has been utilized in the Finnish site characterization programme for spent nuclear fuel waste disposal during the 1980s and 1990s. The system is based on the solid modelling technique. It comprises also rich functionality for the particular geological modelling scheme. The ROCK-CAD system provides, among other things, varying graphical vertical and horizontal intersections and perspective illustrations. The specially developed features are the application of the boundary representation modelling method, parametric object generation language and the discipline approach. The ROCK-CAD system has been utilized in modelling spatial distribution of rock types and fracturing structures in TVO's site characterization. The Olkiluoto site at Eurajoki serves as an example case. The study comprises the description of the modelling process, models and illustration examples. The utilization of bedrock models in site characterization, in tentative repository siting as well as in groundwater flow simulation is depicted. The application software has improved the assessment of the sites studied, given a new basis for the documentation of interpretation and modelling work, substituted hand-drawing and enabled digital transfer to numerical analysis. Finally, aspects of presentation graphics in geological modelling are considered. (84 refs., 30 figs., 11 tabs.)

  12. Designing State Aid Formulas

    Science.gov (United States)

    Zhao, Bo; Bradbury, Katharine

    2009-01-01

    This paper designs a new equalization-aid formula based on fiscal gaps of local communities. When states are in transition to a new local aid formula, the issue of whether and how to hold existing aid harmless poses a challenge. The authors show that some previous studies and the formulas derived from them give differential weights to existing and…

  13. Evaluation of Five Microcomputer CAD Packages.

    Science.gov (United States)

    Leach, James A.

    1987-01-01

    Discusses the similarities, differences, advanced features, applications and number of users of five microcomputer computer-aided design (CAD) packages. Included are: "AutoCAD (V.2.17)"; "CADKEY (V.2.0)"; "CADVANCE (V.1.0)"; "Super MicroCAD"; and "VersaCAD Advanced (V.4.00)." Describes the evaluation of the packages and makes recommendations for…

  14. Development to integrate conceptual design tools and a CAD system

    Science.gov (United States)

    Torres, V. H.; Ríos, J.; Vizán, A.; Pérez, J. M.

    2012-04-01

    The information supported by PLM/CAD systems is mainly related to Embodiment and Detail Design Phases. Information related to the Conceptual Design Phase is mainly limited to requirement specification documents and system architecture diagram documents. This work aims helping in the integration of the Conceptual Design process and its associated information flow into a commercial software system. It proposes a development framework to integrate Quality Function Deployment, Axiomatic Design, and Failure Mode and Effects Analysis into a PLM/CAD system. This communication presents the methodology used in the development, the software development environment, the modeling of the proposed application and the first results of a pilot implementation.

  15. 64006 CAD i Byggesektoren. Grundkursus

    DEFF Research Database (Denmark)

    Borchersen, Egil

    1998-01-01

    Overview on Computer Aided Design in Civil Engineering and introduction to AutoCAD version 13, layers, colours, blocks, attributes.......Overview on Computer Aided Design in Civil Engineering and introduction to AutoCAD version 13, layers, colours, blocks, attributes....

  16. AutoCAD electrical 2013 for electrical control designers

    CERN Document Server

    Tickoo, Sham; CADCIM Technologies

    2013-01-01

    The AutoCAD Electrical 2013 for Electrical Control Designers textbook has been written to assist the engineering students and the practicing designers learn the application of various AutoCAD Electrical tools and options for creating electrical control designs. After reading this textbook, the users will be able to create professional electrical-control drawings easily and effectively. Moreover, the users will be able to automate various control engineering tasks such as building circuits, numbering wires, creating bills of materials, and many more. The textbook takes the users across a wide spectrum of electrical control drawings through progressive examples and numerous illustrations and exercises, thereby making it an ideal guide for both the novice and the advanced users. Salient Features of the Textbook Consists of 14 chapters that are organized in a pedagogical sequence covering various tools and features of AutoCAD Electrical such as schematic drawings, parametric and non-parametric PLC modules, Circu...

  17. Research for Computer Aided Design based on Visual Fortran and AutoCAD%基于Visual Fortran和AutoCAD的计算机辅助设计研究

    Institute of Scientific and Technical Information of China (English)

    白新理; 周生通; 李涛峰; 王清云

    2009-01-01

    Aimed at the fussy details of artificial design of engineering products, taking the fist - level gears transmission for example, using Visual Fortran to carry out the design calculation and the software interface design; adopting programs and database to store and retrieve design data; applying interface programs of Fortran - AutoCAD secondary development to realize the automatic drawing of engineering graphics; and finally could develop a practical CAD System. As a result, the system shows to be easy to learn and use, can greatly improve the design efficiency and quality and is valuable to use widely.%针对工程产品手工设计工作繁琐的缺点,以一级齿轮传动为例,利用Visual Fortran进行设计计算与软件界面设计,借助自编程序及数据库技术存储和管理设计数据,使用开发的Fortran-AutoCAD接口程序来实现工程图自动绘制,最终可开发出一个自动化设计的软件.结果证明,研究成果简单易学,使用方便,能大大提高设计效率和质量,值得广泛推广.

  18. On CAD-integrated Structural Topology and Design Optimization

    DEFF Research Database (Denmark)

    Olhoff, Niels; Bendsøe, M.P.; Rasmussen, John

    1991-01-01

    Concepts underlying an interactive CAD-based engineering design optimization system are developed, and methods of optimizing the topology, shape and sizing of mechanical components are presented. These methods are integrated in the system, and the method for determining the optimal topology is used...

  19. CAD and CAE Integration Through Scientific Visualization Techniques for Illumination Design

    Institute of Scientific and Technical Information of China (English)

    Tiago Martinuzzi Buriol; Sergio Scheer

    2008-01-01

    Engineers tend to use different software to perform tasks such as geometry modeling,database management,numerical analysis,and visualization.This may cause decrease of productivity and loss of information during the conversion process between different data file formats.This paper presents a computer aided design (CAD) and computer aided engineering (CAE) system integration using scientific visualization tools and techniques.It deals with the development of a 3D CAD add-in for lighting analysis which uses the CAD model as 3D interface for creating a lighting scheme,processing,and visualizing 2D or 3D illuminance fields.Visualization features as color and contour mapping were developed using the visualization toolkit (VTK) toolkit.The application integrates all functionalities of the 3D CAD with tools for light sources database management,pre-processing,processing,and post-processing of illuminance fields in a single environment.This approach increases productivity and eliminates the need for different software.

  20. CAD/CAE Integration Enhanced by New CAD Services Standard

    Science.gov (United States)

    Claus, Russell W.

    2002-01-01

    A Government-industry team led by the NASA Glenn Research Center has developed a computer interface standard for accessing data from computer-aided design (CAD) systems. The Object Management Group, an international computer standards organization, has adopted this CAD services standard. The new standard allows software (e.g., computer-aided engineering (CAE) and computer-aided manufacturing software to access multiple CAD systems through one programming interface. The interface is built on top of a distributed computing system called the Common Object Request Broker Architecture (CORBA). CORBA allows the CAD services software to operate in a distributed, heterogeneous computing environment.

  1. Teaching Computer-Aided Design of Fluid Flow and Heat Transfer Engineering Equipment.

    Science.gov (United States)

    Gosman, A. D.; And Others

    1979-01-01

    Describes a teaching program for fluid mechanics and heat transfer which contains both computer aided learning (CAL) and computer aided design (CAD) components and argues that the understanding of the physical and numerical modeling taught in the CAL course is essential to the proper implementation of CAD. (Author/CMV)

  2. Design and manufacture of turbine runner blades using CAD/CAM technology

    Energy Technology Data Exchange (ETDEWEB)

    Strohmer, F.; Winkler, S.

    1986-05-01

    Advances in hydraulic and mechanical design and manufacture of hydraulic turbines have occured over the last years. The turbines have reached a high level of performance. This is especially a result of a proper design and accurate manufacture of the turbine runner due to the application of the computer aided design and computer aided manufacturing systems combined with new computerized analysis techniques. The various steps of the modular numerical system - hydraulic computation, interactive blade design, fluid flow analysis, stress analysis and CNC-manufacture of the model blade - are shown on the example of a runner blade for axial turbines. For optimizing the manufacturing of the prototype blade the CAD/CAM-technology is applied. The data flow from the model blade, measured on an electronic coordinate measurement machine, via the CAD/CAM-system, which represents the blade surface in a mathematical form and calculates the tool paths, to the five axis CNC-milling machine is demonstrated. Through the application of the CAD/CAM-technology to hydraulic blades the time frame for designing and manufacturing has been reduced while improving quality and accuracy of the blades.

  3. COMPUTER AIDED DESIGN OF CUTTING TOOLS

    Directory of Open Access Journals (Sweden)

    Jakub Matuszak

    2015-11-01

    Full Text Available Correct and stable machining process requires an appropriate cutting tool. In most cases the tool can be selected by using special tool catalogs often available in online version. But in some cases there is a need to design unusual tools, for special treatment, which are not available in tool manufacturers’ catalogs. Proper tool design requires strength and geometric calculations. Moreover, in many cases specific technical documentation is required. By using Computer Aided Design of cutting tools this task can be carried out quickly and with high accuracy. Cutting tool visualization in CAD programs gives a clear overview of the design process. Besides, these programs provide the ability to simulate real machining process. Nowadays, 3D modeling in CAD programs is a fundamental tool for engineers. Therefore, it is important to use them in the education process.

  4. Integration of CAD/CAE System for Casting Process Design

    Institute of Scientific and Technical Information of China (English)

    周舰; 荆涛

    2003-01-01

    Concurrent engineering is needed to modernize the foundry industry and to reduce the scrap from castings and thus increase the economic profit. This paper presents an integrated 3-D CAD/CAE system for a foundry using concurrent engineering which considers casting structure, casting type, and manufacturing properties in the CAD module to design the pouring system, the riser, the chill core and so on. A visualized solid model is developed for the casting component with the model design enhanced by CAE analysis. Heat transfer and fluid flow simulation are used to analyze the initial design. The whole product development process is analyzed using concurrent engineering methods. The application shows that the integrated system can improve the efficiency of the design and manufacturing process of die casting.

  5. CDMS: CAD data set system design description. Revision 1

    International Nuclear Information System (INIS)

    This document is intended to formalize the program design of the CAD Data Set Management System (CDMS) and to be the vehicle to communicate the design to the Engineering, Design Services, and Configuration Management organizations and the WHC IRM Analysts/Programmers. The SDD shows how the software system will be structured to satisfy the requirements identified in the WHC-SD-GN-CSRS-30005 CDMS Software Requirement Specification (SRS). It is a description of the software structure, software components, interfaces, and data that make up the CDMS System. The design descriptions contained within this document will describe in detail the software product that will be developed to assist the aforementioned organizations for the express purpose of managing CAD data sets associated with released drawings, replacing the existing locally developed system and laying the foundation for automating the configuration management

  6. Modeling electric fields in two dimensions using computer aided design

    International Nuclear Information System (INIS)

    The authors describe a method for analyzing static electric fields in two dimensions using AutoCAD. The algorithm is coded in LISP and is modeled after Coloumb's Law. The software platform allows for facile graphical manipulations of field renderings and supports a wide range of hardcopy-output and data-storage formats. More generally, this application is representative of the ability to analyze data that is the solution to known mathematical functions with computer aided design (CAD)

  7. Computer Aided Design Modeling for Heterogeneous Objects

    CERN Document Server

    Gupta, Vikas; Tandon, Puneet

    2010-01-01

    Heterogeneous object design is an active research area in recent years. The conventional CAD modeling approaches only provide geometry and topology of the object, but do not contain any information with regard to the materials of the object and so can not be used for the fabrication of heterogeneous objects (HO) through rapid prototyping. Current research focuses on computer-aided design issues in heterogeneous object design. A new CAD modeling approach is proposed to integrate the material information into geometric regions thus model the material distributions in the heterogeneous object. The gradient references are used to represent the complex geometry heterogeneous objects which have simultaneous geometry intricacies and accurate material distributions. The gradient references helps in flexible manipulability and control to heterogeneous objects, which guarantees the local control over gradient regions of developed heterogeneous objects. A systematic approach on data flow, processing, computer visualizat...

  8. Studies Regarding Design and Optimization of Mechanisms Using Modern Techniques of CAD and CAE

    Directory of Open Access Journals (Sweden)

    Marius Tufoi

    2010-01-01

    Full Text Available The paper presents applications of modern techniques of CAD (Computer Aided Design and CAE (Computer Aided Engineering to design and optimize the mechanisms used in mechanical engineering. The use exemplification of these techniques was achieved by designing and optimizing parts of a drawing installation for horizontal continuous casting of metals. By applying these design methods and using finite element method at simulations on designed mechanisms results a number of advantages over traditional methods of drawing and design: speed in drawing, design and optimization of parts and mechanisms, kinematic analysis option, kinetostatic and dynamic through simulation, without requiring physical realization of the part or mechanism, the determination by finite element method of tension, elongations, travel and safety factor and the possibility of optimization for these sizes to ensure the mechanical strength of each piece separately. Achieving these studies was possible using SolidWorks 2009 software suite.

  9. CAD/CAM from the graphic-design perspective

    Energy Technology Data Exchange (ETDEWEB)

    Marcus, A.

    1982-11-01

    CAD/CAM systems have evolved elaborate human-computer interfaces in order to facilitate the creation of highly detailed and specialized schematic diagrams and texts. Although these systems have powerful capacities in terms of graphics editing, data manipulation, and data storage, insufficient attention has been given to making the online interface (together with supporting documentation) user-friendly, i.e., understandable, memorable, and appealing to the general user. Graphic-design considerations in particular have been routinely overlooked. Graphic design concerns typography, symbol design, color, spatial layout, and temporal sequencing. Graphic design can assist computer science by providing insight and expertise in designing effective communication between human being and machine.

  10. Evolution of Geometric Sensitivity Derivatives from Computer Aided Design Models

    Science.gov (United States)

    Jones, William T.; Lazzara, David; Haimes, Robert

    2010-01-01

    The generation of design parameter sensitivity derivatives is required for gradient-based optimization. Such sensitivity derivatives are elusive at best when working with geometry defined within the solid modeling context of Computer-Aided Design (CAD) systems. Solid modeling CAD systems are often proprietary and always complex, thereby necessitating ad hoc procedures to infer parameter sensitivity. A new perspective is presented that makes direct use of the hierarchical associativity of CAD features to trace their evolution and thereby track design parameter sensitivity. In contrast to ad hoc methods, this method provides a more concise procedure following the model design intent and determining the sensitivity of CAD geometry directly to its respective defining parameters.

  11. Computer-aided detection (CAD) of lung nodules in CT scans: radiologist performance and reading time with incremental CAD assistance

    Energy Technology Data Exchange (ETDEWEB)

    Roos, Justus E.; Paik, David; Olsen, David; Liu, Emily G.; Leung, Ann N.; Mindelzun, Robert; Choudhury, Kingshuk R.; Napel, Sandy; Rubin, Geoffrey D. [Stanford University Medical Center, Department of Radiology, Stanford, CA (United States); Chow, Lawrence C. [Oregon Health and Science University, Department of Radiology, Portland, OR (United States); Naidich, David P. [New York University Medical Center, Department of Radiology, New York, NY (United States)

    2010-03-15

    The diagnostic performance of radiologists using incremental CAD assistance for lung nodule detection on CT and their temporal variation in performance during CAD evaluation was assessed. CAD was applied to 20 chest multidetector-row computed tomography (MDCT) scans containing 190 non-calcified {>=}3-mm nodules. After free search, three radiologists independently evaluated a maximum of up to 50 CAD detections/patient. Multiple free-response ROC curves were generated for free search and successive CAD evaluation, by incrementally adding CAD detections one at a time to the radiologists' performance. The sensitivity for free search was 53% (range, 44%-59%) at 1.15 false positives (FP)/patient and increased with CAD to 69% (range, 59-82%) at 1.45 FP/patient. CAD evaluation initially resulted in a sharp rise in sensitivity of 14% with a minimal increase in FP over a time period of 100 s, followed by flattening of the sensitivity increase to only 2%. This transition resulted from a greater prevalence of true positive (TP) versus FP detections at early CAD evaluation and not by a temporal change in readers' performance. The time spent for TP (9.5 s {+-} 4.5 s) and false negative (FN) (8.4 s {+-} 6.7 s) detections was similar; FP decisions took two- to three-times longer (14.4 s {+-} 8.7 s) than true negative (TN) decisions (4.7 s {+-} 1.3 s). When CAD output is ordered by CAD score, an initial period of rapid performance improvement slows significantly over time because of non-uniformity in the distribution of TP CAD output and not to a changing reader performance over time. (orig.)

  12. Computer-aided detection (CAD) of lung nodules and small tumours on chest radiographs

    International Nuclear Information System (INIS)

    Detection of focal pulmonary lesions is limited by quantum and anatomic noise and highly influenced by variable perception capacity of the reader. Multiple studies have proven that lesions - missed at time of primary interpretation - were visible on the chest radiographs in retrospect. Computer-aided diagnosis (CAD) schemes do not alter the anatomic noise but aim at decreasing the intrinsic limitations and variations of human perception by alerting the reader to suspicious areas in a chest radiograph when used as a 'second reader'. Multiple studies have shown that the detection performance can be improved using CAD especially for less experienced readers at a variable amount of decreased specificity. There seem to be a substantial learning process for both, experienced and inexperienced readers, to be able to optimally differentiate between false positive and true positive lesions and to build up sufficient trust in the capabilities of these systems to be able to use them at their full advantage. Studies so far focussed on stand-alone performance of the CAD schemes to reveal the magnitude of potential impact or on retrospective evaluation of CAD as a second reader for selected study groups. Further research is needed to assess the performance of these systems in clinical routine and to determine the trade-off between performance increase in terms of increased sensitivity and decreased inter-reader variability and loss of specificity and secondary indicated follow-up examinations for further diagnostic workup.

  13. Computer-aided detection (CAD) of breast masses in mammography: combined detection and ensemble classification

    International Nuclear Information System (INIS)

    We propose a novel computer-aided detection (CAD) framework of breast masses in mammography. To increase detection sensitivity for various types of mammographic masses, we propose the combined use of different detection algorithms. In particular, we develop a region-of-interest combination mechanism that integrates detection information gained from unsupervised and supervised detection algorithms. Also, to significantly reduce the number of false-positive (FP) detections, the new ensemble classification algorithm is developed. Extensive experiments have been conducted on a benchmark mammogram database. Results show that our combined detection approach can considerably improve the detection sensitivity with a small loss of FP rate, compared to representative detection algorithms previously developed for mammographic CAD systems. The proposed ensemble classification solution also has a dramatic impact on the reduction of FP detections; as much as 70% (from 15 to 4.5 per image) at only cost of 4.6% sensitivity loss (from 90.0% to 85.4%). Moreover, our proposed CAD method performs as well or better (70.7% and 80.0% per 1.5 and 3.5 FPs per image respectively) than the results of mammography CAD algorithms previously reported in the literature. (paper)

  14. A critically appraised topic review of computer-aided design/computer-aided machining of removable partial denture frameworks.

    Science.gov (United States)

    Lang, Lisa A; Tulunoglu, Ibrahim

    2014-01-01

    A critically appraised topic (CAT) review is presented about the use of computer-aided design (CAD)/computer-aided machining (CAM) removable partial denture (RPD) frameworks. A systematic search of the literature supporting CAD/CAM RPD systems revealed no randomized clinical trials, hence the CAT review was performed. A PubMed search yielded 9 articles meeting the inclusion criteria. Each article was characterized by study design and level of evidence. No clinical outcomes research has been published on the use of CAD/CAM RPDs. Low levels of evidence were found in the available literature. Clinical research studies are needed to determine the efficacy of this treatment modality.

  15. Assessment of Chair-side Computer-Aided Design and Computer-Aided Manufacturing Restorations: A Review of the Literature

    OpenAIRE

    Baroudi, Kusai; Ibraheem, Shukran Nasser

    2015-01-01

    Background: This paper aimed to evaluate the application of computer-aided design and computer-aided manufacturing (CAD-CAM) technology and the factors that affect the survival of restorations. Materials and Methods: A thorough literature search using PubMed, Medline, Embase, Science Direct, Wiley Online Library and Grey literature were performed from the year 2004 up to June 2014. Only relevant research was considered. Results: The use of chair-side CAD/CAM systems is promising in all dental...

  16. Cam Design Projects in an Advanced CAD Course for Mechanical Engineers

    Science.gov (United States)

    Ault, H. K.

    2009-01-01

    The objective of this paper is to present applications of solid modeling aimed at modeling of complex geometries such as splines and blended surfaces in advanced CAD courses. These projects, in CAD-based Mechanical Engineering courses, are focused on the use of the CAD system to solve design problems for applications in machine design, namely the…

  17. AutoCAD electrical 2016 for electrical control designers

    CERN Document Server

    Tickoo, Sham

    2016-01-01

    The AutoCAD Electrical 2016 for Electrical Control Designers textbook has been written to assist the engineering students and the practicing designers who are new to AutoCAD Electrical. Using this textbook, the readers can learn the application of basic tools required for creating professional electrical control drawings with the help of AutoCAD Electrical. Keeping in view the varied requirements of the users, this textbook covers a wide range of tools and features such as schematic drawings, Circuit Builder, panel drawings, parametric and nonparametric PLC modules, stand-alone PLC I/O points, ladder diagrams, point-to-point wiring diagrams, report generation, creation of symbols, and so on. This will help the readers to create electrical drawings easily and effectively. Special emphasis has been laid on the introduction of concepts, which have been explained using text and supported with graphical examples. The examples and tutorials used in this book ensure that the users can relate the information provided...

  18. AutoCAD 2010 For Dummies

    CERN Document Server

    Byrnes, David

    2009-01-01

    AutoCAD is the hot computer-aided design software known for both its powerful tools and its complexity. AutoCAD 2010 for Dummies is the bestselling guide that walks you through this complicated program so you can build complex 3D technical drawings, edit like a pro, enter new dimensions, and plot with style. AutoCAD 2010 for Dummies helps you navigate the program, use the AutoCAD Design Center, create a basic layout and work with dimension, and put your drawings on the Internet. You'll soon be setting up the AutoCAD environment, using the AutoCAD Ribbon, creating annotation and dimension drawi

  19. Comparison of standard reading and computer aided detection (CAD) on a national proficiency test of screening mammography

    International Nuclear Information System (INIS)

    Objective: To evaluate the role of computer aided detection (CAD) in improving the interpretation of screening mammograms Material and methods: Ten radiologists underwent a proficiency test of screening mammography first by conventional reading and then with the help of CAD. Radiologists were blinded to test results for the whole study duration. Results of conventional and CAD reading were compared in terms of sensitivity and recall rate. Double reading was simulated combining conventional readings of four expert radiologists and compared with CAD reading. Results: Considering all ten readings, cancer was identified in 146 or 153 of 170 cases (85.8 vs. 90.0%; χ2=0.99, df=1, P=0.31) and recalls were 106 or 152 of 1330 cases (7.9 vs. 11.4%; χ2=8.69, df=1, P=0.003) at conventional or CAD reading, respectively. CAD reading was essentially the same (sensitivity 97.0 vs. 96.0%; χ2=7.1, df=1, P=0.93; recall rate 10.7 vs. 10.6%; χ2=1.5, df=1, P=0.96) as compared with simulated conventional double reading. Conclusion: CAD reading seems to improve the sensitivity of conventional reading while reducing specificity, both effects being of limited size. CAD reading had almost the same performance of simulated conventional double reading, suggesting a possible use of CAD which needs to be confirmed by further studies inclusive of cost-effective analysis

  20. Computer aided product design

    DEFF Research Database (Denmark)

    Constantinou, Leonidas; Bagherpour, Khosrow; Gani, Rafiqul;

    1996-01-01

    A general methodology for Computer Aided Product Design (CAPD) with specified property constraints which is capable of solving a large range of problems is presented. The methodology employs the group contribution approach, generates acyclic, cyclic and aromatic compounds of various degrees......-liquid equilibria (LLE), solid-liquid equilibria (SLE) and gas solubility. Finally, a computer program based on the extended methodology has been developed and the results from five case studies highlighting various features of the methodology are presented....

  1. A REVIEW ON DISEASES MANIFESTATION BY OCULAR DISEASES USING COMPUTER AIDED DIAGNOSIS (CAD

    Directory of Open Access Journals (Sweden)

    Ridza Azri Ramlee

    2015-08-01

    Full Text Available The use of eye for diagnosis for detecting the disease has been used long time ago. However, for conventional medical practitioners this procedure are used to detect diseases that cause vision problems. This method is widely used by practitioners of alternative medicine that uses the eyes to detect the presence of disease, such as iridology practitioners. In this paper we study the method adopted by the researchers based on conventional and alternative medical practitioners to detect the presence of disease using a computer-aided diagnosis (CAD or automatically

  2. VLSI Design with Alliance Free CAD Tools: an Implementation Example

    Directory of Open Access Journals (Sweden)

    Chávez-Bracamontes Ramón

    2015-07-01

    Full Text Available This paper presents the methodology used for a digital integrated circuit design that implements the communication protocol known as Serial Peripheral Interface, using the Alliance CAD System. The aim of this paper is to show how the work of VLSI design can be done by graduate and undergraduate students with minimal resources and experience. The physical design was sent to be fabricated using the CMOS AMI C5 process that features 0.5 micrometer in transistor size, sponsored by the MOSIS Educational Program. Tests were made on a platform that transfers data from inertial sensor measurements to the designed SPI chip, which in turn sends the data back on a parallel bus to a common microcontroller. The results show the efficiency of the employed methodology in VLSI design, as well as the feasibility of ICs manufacturing from school projects that have insufficient or no source of funding

  3. Advances in computer-aided engineering: CAD/CAM-research at Delft University of Technology. Report of the VF-project CAD/CAM 1989-1994

    NARCIS (Netherlands)

    1994-01-01

    This book contains a collection of articles describing on-going CAD/CAM-research at several engineering faculties at Delft University of Technology. Two main themes covered in this book are 'Conceptual design of complex products' and 'Product modelling and product data exchange'.

  4. Is computer aided detection (CAD cost effective in screening mammography? A model based on the CADET II study

    Directory of Open Access Journals (Sweden)

    Wallis Matthew G

    2011-01-01

    Full Text Available Abstract Background Single reading with computer aided detection (CAD is an alternative to double reading for detecting cancer in screening mammograms. The aim of this study is to investigate whether the use of a single reader with CAD is more cost-effective than double reading. Methods Based on data from the CADET II study, the cost-effectiveness of single reading with CAD versus double reading was measured in terms of cost per cancer detected. Cost (Pound (£, year 2007/08 of single reading with CAD versus double reading was estimated assuming a health and social service perspective and a 7 year time horizon. As the equipment cost varies according to the unit size a separate analysis was conducted for high, average and low volume screening units. One-way sensitivity analyses were performed by varying the reading time, equipment and assessment cost, recall rate and reader qualification. Results CAD is cost increasing for all sizes of screening unit. The introduction of CAD is cost-increasing compared to double reading because the cost of CAD equipment, staff training and the higher assessment cost associated with CAD are greater than the saving in reading costs. The introduction of single reading with CAD, in place of double reading, would produce an additional cost of £227 and £253 per 1,000 women screened in high and average volume units respectively. In low volume screening units, the high cost of purchasing the equipment will results in an additional cost of £590 per 1,000 women screened. One-way sensitivity analysis showed that the factors having the greatest effect on the cost-effectiveness of CAD with single reading compared with double reading were the reading time and the reader's professional qualification (radiologist versus advanced practitioner. Conclusions Without improvements in CAD effectiveness (e.g. a decrease in the recall rate CAD is unlikely to be a cost effective alternative to double reading for mammography screening

  5. The application of computer-aided technologies in automotive styling design

    Science.gov (United States)

    Zheng, Ze-feng; Zhang, Ji; Zheng, Ying

    2012-04-01

    In automotive industry, outline design is its life and creative design is its soul indeed. Computer-aided technology has been widely used in the automotive industry and more and more attention has been paid. This paper chiefly introduce the application of computer-aided technologies including CAD, CAM and CAE, analyses the process of automotive structural design and describe the development tendency of computer-aided design.

  6. A review of computer-aided design/computer-aided manufacture techniques for removable denture fabrication.

    Science.gov (United States)

    Bilgin, Mehmet Selim; Baytaroğlu, Ebru Nur; Erdem, Ali; Dilber, Erhan

    2016-01-01

    The aim of this review was to investigate usage of computer-aided design/computer-aided manufacture (CAD/CAM) such as milling and rapid prototyping (RP) technologies for removable denture fabrication. An electronic search was conducted in the PubMed/MEDLINE, ScienceDirect, Google Scholar, and Web of Science databases. Databases were searched from 1987 to 2014. The search was performed using a variety of keywords including CAD/CAM, complete/partial dentures, RP, rapid manufacturing, digitally designed, milled, computerized, and machined. The identified developments (in chronological order), techniques, advantages, and disadvantages of CAD/CAM and RP for removable denture fabrication are summarized. Using a variety of keywords and aiming to find the topic, 78 publications were initially searched. For the main topic, the abstract of these 78 articles were scanned, and 52 publications were selected for reading in detail. Full-text of these articles was gained and searched in detail. Totally, 40 articles that discussed the techniques, advantages, and disadvantages of CAD/CAM and RP for removable denture fabrication and the articles were incorporated in this review. Totally, 16 of the papers summarized in the table. Following review of all relevant publications, it can be concluded that current innovations and technological developments of CAD/CAM and RP allow the digitally planning and manufacturing of removable dentures from start to finish. As a result according to the literature review CAD/CAM techniques and supportive maxillomandibular relationship transfer devices are growing fast. In the close future, fabricating removable dentures will become medical informatics instead of needing a technical staff and procedures. However the methods have several limitations for now. PMID:27095912

  7. A review of computer-aided design/computer-aided manufacture techniques for removable denture fabrication.

    Science.gov (United States)

    Bilgin, Mehmet Selim; Baytaroğlu, Ebru Nur; Erdem, Ali; Dilber, Erhan

    2016-01-01

    The aim of this review was to investigate usage of computer-aided design/computer-aided manufacture (CAD/CAM) such as milling and rapid prototyping (RP) technologies for removable denture fabrication. An electronic search was conducted in the PubMed/MEDLINE, ScienceDirect, Google Scholar, and Web of Science databases. Databases were searched from 1987 to 2014. The search was performed using a variety of keywords including CAD/CAM, complete/partial dentures, RP, rapid manufacturing, digitally designed, milled, computerized, and machined. The identified developments (in chronological order), techniques, advantages, and disadvantages of CAD/CAM and RP for removable denture fabrication are summarized. Using a variety of keywords and aiming to find the topic, 78 publications were initially searched. For the main topic, the abstract of these 78 articles were scanned, and 52 publications were selected for reading in detail. Full-text of these articles was gained and searched in detail. Totally, 40 articles that discussed the techniques, advantages, and disadvantages of CAD/CAM and RP for removable denture fabrication and the articles were incorporated in this review. Totally, 16 of the papers summarized in the table. Following review of all relevant publications, it can be concluded that current innovations and technological developments of CAD/CAM and RP allow the digitally planning and manufacturing of removable dentures from start to finish. As a result according to the literature review CAD/CAM techniques and supportive maxillomandibular relationship transfer devices are growing fast. In the close future, fabricating removable dentures will become medical informatics instead of needing a technical staff and procedures. However the methods have several limitations for now.

  8. Web-Based Interactive VR-CAD System for Conceptual Design and Analysis

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    To overcome the bottleneck of the one-way translation from VR (virtual reality) to CAD in VR-based CAD system, this paper proposes a Web-based VR-CAD system WVCD ( Web-based virtual conceptual designer) to support both customers'and design team members'involvement in the conceptual design and analysis activity over the Interbet. It provides users with both parametric and freehand methods to create and edit 3D conceptual models with different levels of complexity in a VR envixonment intuitively without the need of switching between the VR environment and CAD tools. As a simple and low-cost VR-CAD system, WVCD can help to popularize and improve the Web-based collaborative conceptual design.

  9. Complete PCB design using OrCAD capture and PCB editor

    CERN Document Server

    Mitzner, Kraig

    2009-01-01

    This book provides instruction on how to use the OrCAD design suite to design and manufacture printed circuit boards. The primary goal is to show the reader how to design a PCB using OrCAD Capture and OrCAD Editor. Capture is used to build the schematic diagram of the circuit, and Editor is used to design the circuit board so that it can be manufactured. The book is written for both students and practicing engineers who need in-depth instruction on how to use the software, and who need background knowledge of the PCB design process. KEY FEATURES:* Beginning to end cove

  10. Computer-aided detection of lung cancer on chest radiographs: effect of machine CAD true positive/false negative detections on radiologists' confidence level

    Science.gov (United States)

    Freedman, Matthew T.; Osicka, Teresa; Lo, Shih-Chung Benedict; Lure, Fleming; Xu, Xin-Wei; Lin, Jesse; Zhao, Hui; Zhang, Ron

    2004-05-01

    This paper evaluates the effect of Computer-Aided Detection prompts on the confidence and detection of cancer on chest radiographs. Expected findings included an increase in confidence rating and a decrease in variance in confidence when radiologists interacted with a computer prompt that confirmed their initial decision or induced them to switch from an incorrect to a correct decision. Their confidence rating decreased and the variance of confidence rating increased when the computer failed to confirm a correct or incorrect decision. A population of cases was identified that changed among reading modalities. This unstable group of cases differed between the Independent and Sequential without CAD modalities in cancer detection by radiologists and cancer detection by machine. CAD prompts induced the radiologists to make two types of changes in cases: changes on the sequential modality with CAD that restored an initial diagnosis made in the Independent read and new changes that were not present in the Independent or Sequential reads without CAD. This has implications for double reading of cases. The effects of intra-observer variability and inter-observer variability are suggested as potential causes for differences in statistical significance of the Independent and Sequential Design approaches to ROC studies.

  11. Computer Aided Design Of Electrical Machines For Variable Speed Applications.

    Science.gov (United States)

    Krishnan, R.; Aravind, S.; Materu, P.

    1987-10-01

    In recent years, the product life cycle has decreased and demands for new products have emerged due to competition, modern industrial needs and rapidly changing technology. This has necessitated changes in design, development and manufacturing processes so as to improve quality and efficiency as well as reducing costs. Computer Aided Design (CAD) helps to meet this challenge in the design evaluation and final product design stages. This paper presents the development of an interactive software for the optimal design of a motor intended for variable speed applications. The use of finite element analysis methods is proposed as an indispensable part of the CAD system for electrical machine design. An illustration of the method is given for the design of a switched reluctance motor.

  12. Computer-aided fabrication of bridges; Kyoryo seisaku ni okeru CAD-CAM no genjo to kadai

    Energy Technology Data Exchange (ETDEWEB)

    Watanabe, N. [Mitsubishi Heavy Industries, Ltd., Tokyo (Japan)

    1996-08-01

    Described herein is application of the computer-aided CAD/CAM systems to fabrication of bridges from the designs to inspection and production management in the order of production flow. The design works begin with inputting coordinate values for road alignment to determine alignment drawings, coordinates and haunches, and to output the alignment drawings, coordinates, haunches and calculation of haunches and web crest height, and are extended to automatic designs of major girder sections, splices, stiffeners and floor frames, and to preparation of design calculation sheets. As the drawings, although showing bridge characteristics such as completed shapes, are frequently silent on fabricated shapes, the full-size modeling is effected by an automatic program with the additional data regarding welding-induced shrinkage, cambers, joint gaps, allowances for finishing and bore sizes. The CAM systems for fabrication include those for marking, NC marking for cutting, plasma/gas cutters and panel welding robots, which are connected to DNC servers in LAN systems. 6 refs., 14 figs.

  13. Mobile Technology and CAD Technology Integration in Teaching Architectural Design Process for Producing Creative Product

    Science.gov (United States)

    Bin Hassan, Isham Shah; Ismail, Mohd Arif; Mustafa, Ramlee

    2011-01-01

    The purpose of this research is to examine the effect of integrating the mobile and CAD technology on teaching architectural design process for Malaysian polytechnic architectural students in producing a creative product. The website is set up based on Caroll's minimal theory, while mobile and CAD technology integration is based on Brown and…

  14. ASPECTS OF DESIGN PROCESS AND CAD MODELLING OF AN ADJUSTABLE CENTRIFUGAL COUPLING

    Directory of Open Access Journals (Sweden)

    Adrian BUDALĂ

    2015-05-01

    Full Text Available The paper deals with constructive and functional elements of an adjustable coupling with friction shoes and adjustable driving. Also, the paper shows few stages of the design process, some advantages of the using CAD software and some comparative results prototype vs. CAD model.

  15. 3D-CAD Effects on Creative Design Performance of Different Spatial Abilities Students

    Science.gov (United States)

    Chang, Y.

    2014-01-01

    Students' creativity is an important focus globally and is interrelated with students' spatial abilities. Additionally, three-dimensional computer-assisted drawing (3D-CAD) overcomes barriers to spatial expression during the creative design process. Does 3D-CAD affect students' creative abilities? The purpose of this study was to…

  16. Influence of different luting protocols on shear bond strength of computer aided design/computer aided manufacturing resin nanoceramic material to dentin

    OpenAIRE

    Claudio Poggio; Marco Pigozzo; Matteo Ceci; Andrea Scribante; Riccardo Beltrami; Marco Chiesa

    2016-01-01

    Background: The purpose of this study was to evaluate the influence of three different luting protocols on shear bond strength of computer aided design/computer aided manufacturing (CAD/CAM) resin nanoceramic (RNC) material to dentin. Materials and Methods: In this in vitro study, 30 disks were milled from RNC blocks (Lava Ultimate/3M ESPE) with CAD/CAM technology. The disks were subsequently cemented to the exposed dentin of 30 recently extracted bovine permanent mandibular incisors. The...

  17. Modeling facilities Architecture and Design using transfer files from AutoCAD to 3d Max Designe

    OpenAIRE

    Hnitetska, T.; National Aviation University, Kyiv, Ukraine; Hnitetska, G. O.; National Aviation University, Kyiv, Ukraine

    2014-01-01

    This work is devoted to the possibility of modeling objects ofarchitecture and design in a single information space of two graphical editors AutoCAD and 3d Max Designe. Consider ways to create 3d objects in various ways, and automatic modification of 3d model in 3d Max Designe in amending its plan in AutoCAD.

  18. Fracture resistance of computer-aided design/computer-aided manufacturing-generated composite resin-based molar crowns

    OpenAIRE

    Harada, A.; Nakamura, Keisuke; Kanno, Taro; Inagaki, R.; Ørtengren, Ulf Thore; Niwano, Y; Sasaki, Keiichi; Egusa, Hiroshi

    2015-01-01

    The aim of this study was to investigate whether different fabrication processes, such as the computer-aided design/computer-aided manufacturing (CAD/CAM) system or the manual build-up technique, affect the fracture resistance of composite resin-based crowns. Lava Ultimate (LU), Estenia C&B (EC&B), and lithium disilicate glass-ceramic IPS e.max press (EMP) were used. Four types of molar crowns were fabricated: CAD/CAM-generated composite resin-based crowns (LU crowns); manua...

  19. Computer-Aided Design System for CP Single-Screw Compressor

    Institute of Scientific and Technical Information of China (English)

    SHEN Jing-feng; YAO Fu-sheng

    2006-01-01

    To design various optimum parameters and simulate the working process of CP single-screw compressor,the Computer-Aided Design(CAD)system for the CP singlescrew compressor has been established.A new method based on computer graphics technology,database technology,object-oriented programming technology,and visual simulation technology has been adopted in this CAD system.The system has integrated solid modeling function with parameterization design function and animator simulation function based on analyzing the working principle of the CP single-screw compressor.The experimental results show fhat the CAD system for the CP single-screw compressor is practical and feasible.

  20. Human Factors of Integrating Speech and Manual Input Devices: The Case of Computer Aided Design

    OpenAIRE

    Khalid, H. M.

    1990-01-01

    The thesis investigates integrating the use of speech input and manual input devices in human-computer systems. The domain of computer aided design (CAD) is used as a case study. A methodology for empirical evaluation of CAD systems is presented. The methodology is based on a framework that describes the input/output processes presumed to underlie performance in design activities, using behaviour protocols and performance indices as data. For modelling system behaviour, a framework d...

  1. Aspects on Transfer of Aided - Design Files

    Science.gov (United States)

    Goanta, A. M.; Anghelache, D. G.

    2016-08-01

    At this stage of development of hardware and software, each company that makes design software packages has a certain type of file created and customized in time to distinguish that company from its competitors. Thus today are widely known the DWG files belonging AutoCAD, IPT / IAM belonging to Inventor, PAR / ASM of Solid Edge's, PRT from the NX and so on. Behind every type of file there is a mathematical model which is common to more types of files. A specific aspect of the computer -aided design is that all softwares are working with both individual parts and assemblies, but their approach is different in that some use the same type of file both for each part and for the whole (PRT ), while others use different types of files (IPT / IAM, PAR / ASM, etc.). Another aspect of the computer -aided design is to transfer files between different companies which use different software packages or even the same software package but in different versions. Each of these situations generates distinct issues. Thus, to solve the partial reading by a project different from the native one, transfer files of STEP and IGES type are used

  2. Viewing CAD Drawings on the Internet

    Science.gov (United States)

    Schwendau, Mark

    2004-01-01

    Computer aided design (CAD) has been producing 3-D models for years. AutoCAD software is frequently used to create sophisticated 3-D models. These CAD files can be exported as 3DS files for import into Autodesk's 3-D Studio Viz. In this program, the user can render and modify the 3-D model before exporting it out as a WRL (world file hyperlinked)…

  3. Computing Mass Properties From AutoCAD

    Science.gov (United States)

    Jones, A.

    1990-01-01

    Mass properties of structures computed from data in drawings. AutoCAD to Mass Properties (ACTOMP) computer program developed to facilitate quick calculations of mass properties of structures containing many simple elements in such complex configurations as trusses or sheet-metal containers. Mathematically modeled in AutoCAD or compatible computer-aided design (CAD) system in minutes by use of three-dimensional elements. Written in Microsoft Quick-Basic (Version 2.0).

  4. Computer- Aided Design in Power Engineering Application of Software Tools

    CERN Document Server

    Stojkovic, Zlatan

    2012-01-01

    This textbooks demonstrates the application of software tools in solving a series of problems from the field of designing power system structures and systems. It contains four chapters: The first chapter leads the reader through all the phases necessary in the procedures of computer aided modeling and simulation. It guides through the complex problems presenting on the basis of eleven original examples. The second chapter presents  application of software tools in power system calculations of power systems equipment design. Several design example calculations are carried out using engineering standards like MATLAB, EMTP/ATP, Excel & Access, AutoCAD and Simulink. The third chapters focuses on the graphical documentation using a collection of software tools (AutoCAD, EPLAN, SIMARIS SIVACON, SIMARIS DESIGN) which enable the complete automation of the development of graphical documentation of a power systems. In the fourth chapter, the application of software tools in the project management in power systems ...

  5. Comparison of two software versions of a commercially available computer-aided detection (CAD) system for detecting breast cancer

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Seung Ja; Moon, Woo Kyung; Kim, Soo-Yeon; Chang, Jung Min; Cho, Nariya (Dept. of Radiology, Seoul National Univ. Hospital, Seoul (Korea)), e-mail: moonwk@radcom.snu.ac.kr; Kim, Sun Mi (Dept. of Radiology and Bundang Seoul National Univ. Hospital, Seoul (Korea))

    2010-06-15

    Background: The performance of the computer-aided detection (CAD) system can be determined by the sensitivity and false-positive marks rate, therefore these factors should be improved by upgrading the software version of the CAD system. Purpose: To compare retrospectively the performances of two software versions of a commercially available CAD system when applied to full-field digital mammograms for the detection of breast cancers in a screening group. Material and Methods: Versions 3.1 and 8.3 of a CAD software system (ImageChecker, R2 Technology) were applied to the full-field digital mammograms of 130 women (age range 36-80, mean age 53 years) with 130 breast cancers detected by screening. Results: The overall sensitivities of the version 3.1 and 8.3 CAD systems were 92.3% (120 of 130) and 96.2% (125 of 130) (P=0.025), respectively, and sensitivities for masses were 78.3% (36 of 46) and 89.1% (41 of 46) (P=0.024) and for microcalcifications 100% (84 of 84) and 100% (84 of 84), respectively. Version 8.3 correctly marked five lesions of invasive ductal carcinoma that were missed by version 3.1. Average numbers of false-positive marks per image were 0.38 (0.15 for calcifications, 0.23 for masses) for version 3.1 and 0.46 (0.13 for calcifications, 0.33 for masses) for version 8.3 (P=0.1420). Conclusion: The newer version 8.3 of the CAD system showed better overall sensitivity for the detection of breast cancer than version 3.1 due to its improved sensitivity for masses when applied to full-field digital mammograms

  6. SNL Mechanical Computer Aided Design (MCAD) guide 2007.

    Energy Technology Data Exchange (ETDEWEB)

    Moore, Brandon; Pollice, Stephanie L.; Martinez, Jack R.

    2007-12-01

    This document is considered a mechanical design best-practice guide to new and experienced designers alike. The contents consist of topics related to using Computer Aided Design (CAD) software, performing basic analyses, and using configuration management. The details specific to a particular topic have been leveraged against existing Product Realization Standard (PRS) and Technical Business Practice (TBP) requirements while maintaining alignment with sound engineering and design practices. This document is to be considered dynamic in that subsequent updates will be reflected in the main title, and each update will be published on an annual basis.

  7. Energy-aware memory management for embedded multimedia systems a computer-aided design approach

    CERN Document Server

    Balasa, Florin

    2011-01-01

    Energy-Aware Memory Management for Embedded Multimedia Systems: A Computer-Aided Design Approach presents recent computer-aided design (CAD) ideas that address memory management tasks, particularly the optimization of energy consumption in the memory subsystem. It explains how to efficiently implement CAD solutions, including theoretical methods and novel algorithms. The book covers various energy-aware design techniques, including data-dependence analysis techniques, memory size estimation methods, extensions of mapping approaches, and memory banking approaches. It shows how these techniques

  8. CAD-Based Aerodynamic Design of Complex Configurations using a Cartesian Method

    Science.gov (United States)

    Nemec, Marian; Aftosmis, Michael J.; Pulliam, Thomas H.

    2003-01-01

    A modular framework for aerodynamic optimization of complex geometries is developed. By working directly with a parametric CAD system, complex-geometry models are modified nnd tessellated in an automatic fashion. The use of a component-based Cartesian method significantly reduces the demands on the CAD system, and also provides for robust and efficient flowfield analysis. The optimization is controlled using either a genetic or quasi-Newton algorithm. Parallel efficiency of the framework is maintained even when subject to limited CAD resources by dynamically re-allocating the processors of the flow solver. Overall, the resulting framework can explore designs incorporating large shape modifications and changes in topology.

  9. Is single reading with computer-aided detection (CAD as good as double reading in mammography screening? A systematic review

    Directory of Open Access Journals (Sweden)

    Azavedo Edward

    2012-07-01

    Full Text Available Abstract Background In accordance with European guidelines, mammography screening comprises independent readings by two breast radiologists (double reading. CAD (computer-aided detection has been suggested to complement or replace one of the two readers (single reading + CAD. The aim of this systematic review is to address the following question: Is the reading of mammographic x-ray images by a single breast radiologist together with CAD at least as accurate as double reading? Methods The electronic literature search included the databases Pub Med, EMBASE and The Cochrane Library. Two independent reviewers assessed abstracts and full-text articles. Results 1049 abstracts were identified, of which 996 were excluded with reference to inclusion and exclusion criteria; 53 full-text articles were assessed for eligibility. Finally, four articles were included in the qualitative analysis, and one in a GRADE synthesis. Conclusions The scientific evidence is insufficient to determine whether the accuracy of single reading + CAD is at least equivalent to that obtained in standard practice, i.e. double reading where two breast radiologists independently read the mammographic images.

  10. Computer aided design (CAD) for electronics improvement of the nuclear channels of TRIGA Mark III reactor of the ININ; Diseno asistido por computadora (DAC) para mejorar la electronica de los canales nucleares del reactor TRIGA Mark III del ININ

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez M, J.L.; Rivero G, T.; Aguilar H, F. [ININ, 52750 La Marquesa, Estado de Mexico (Mexico)]. e-mail: jlgm@nuclear.inin.mx

    2007-07-01

    The 4 neutron measurement channels of the digital control console (CCD) of the TRIGA Mark III reactor (RTMIII) of the ININ, its were designed and built with the corresponding Quality Guarantee program, being achieved the one licensing to replace the old console. With the time they were carried out some changes to improve and to not solve some problems detected in the tests, verification and validation, requiring to modify the circuits originally designed. In this work the corrective actions carried out to eliminate the Non Conformity generated by these problems, being mentioned the advantages of using modern tools, as the software applied to the Attended Engineering by Computer, and those obtained results are presented. (Author)

  11. DESIGN AND CAD SYSTEM OF THE TOOL FOR DRILL FLUTE

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Based on the principles of differential geometry and kinematics, a mathematical model is developed to describe the grinding wheel axial cross-section with the radial cross-section of the flute in a given drill under the basic engagement condition between the generating flute and the generated grinding wheel (or disk milling tool). The mathematical model is good for the flute in the radial cross-section consisting of three arcs. Furthermore, a CAD system is also developed to represent the axial cross-section of the grinding wheel (or disk milling tool). With the system, the grinding wheel (or disk milling tool) axial cross-section that corresponds to the three-arc flute cross section can be conveniently simulated. Through the grinding experiment of drill flutes, the method and the CAD system are proved to be feasible and reasonable.

  12. Resin-composite Blocks for Dental CAD/CAM Applications

    OpenAIRE

    Ruse, N.D.; Sadoun, M.J.

    2014-01-01

    Advances in digital impression technology and manufacturing processes have led to a dramatic paradigm shift in dentistry and to the widespread use of computer-aided design/computer-aided manufacturing (CAD/CAM) in the fabrication of indirect dental restorations. Research and development in materials suitable for CAD/CAM applications are currently the most active field in dental materials. Two classes of materials are used in the production of CAD/CAM restorations: glass-ceramics/ceramics and ...

  13. PorkCAD: Case study of the design of a pork product prototyper

    DEFF Research Database (Denmark)

    Laursen, Lasse Farnung; Bærentzen, J. Andreas; Igarashi, T.;

    2013-01-01

    With the help of industry experts we developed porkCAD, an application intended to aid in the communication process between producer and retailer when developing new meat products for a constantly evolving market. The application interface allows the user to make planar cuts to a virtual pig formed...... the usability of porkCAD, we tested it with personnel from the pork industry, using two different controller interfaces, one being a traditional mouse and keyboard input, and the other a six degrees of freedom haptic feedback device. The accurate depiction of pig anatomy guided trained professionals to re......-create standardized pig products using porkCAD. The quantitative results of the usability test with sales personnel did not lean significantly in favor of either interface. Since one interface was extremely well known and the other highly unfamiliar, the fact that users did not express a clear preference...

  14. On the Use of Parmetric-CAD Systems and Cartesian Methods for Aerodynamic Design

    Science.gov (United States)

    Nemec, Marian; Aftosmis, Michael J.; Pulliam, Thomas H.

    2004-01-01

    Automated, high-fidelity tools for aerodynamic design face critical issues in attempting to optimize real-life geometry arid in permitting radical design changes. Success in these areas promises not only significantly shorter design- cycle times, but also superior and unconventional designs. To address these issues, we investigate the use of a parmetric-CAD system in conjunction with an embedded-boundary Cartesian method. Our goal is to combine the modeling capabilities of feature-based CAD with the robustness and flexibility of component-based Cartesian volume-mesh generation for complex geometry problems. We present the development of an automated optimization frame-work with a focus on the deployment of such a CAD-based design approach in a heterogeneous parallel computing environment.

  15. Computer Aided Design i England

    DEFF Research Database (Denmark)

    Sigrist, F.; Agger, K.; Barfoed, P.;

    Meddelelsen redegør for en række besøg hos engelske systemleverandører og brugere. Seks forskellige CAD-systemer vurderes på baggrund af deres brug i praksis, og valget af to systemer til afprøvning i Danmark begrundes. Desuden bringes generelle konklusioner om CAD-systemernes aktuelle udviklings...

  16. Computer Aided Design of Kaplan Turbine Piston with\tSolidWorks

    Directory of Open Access Journals (Sweden)

    Camelia Jianu

    2010-10-01

    Full Text Available The paper presents the steps for 3D computer aided design (CAD of Kaplan turbine piston made in SolidWorks.The present paper is a tutorial for a Kaplan turbine piston 3D geometry, which is dedicaded to the Parts Sketch and Parts Features design and Drawing Geometry and Drawing Annotation.

  17. Echelle spectrograph software design aid

    Science.gov (United States)

    Dantzler, A. A.

    1985-01-01

    A method for mapping, to first order, the spectrograms that result from echelle spectrographic systems is discussed. An in-depth description of the principles behind the method are given so that software may be generated. Such software is an invaluable echelle spectrograph design aid. Results from two applications are discussed.

  18. Computer-aided design of a coffee-dragging device

    OpenAIRE

    Marcus Vinicuis Morais de Oliveira; Mauri Martins Teixeira; Haroldo Carlos Fernandes; Daniel Marçal de Queiroz; Raphael Magalhães Gomes Moreira

    2014-01-01

    Dragging is the most costly and time-consuming stage of the coffee harvest. Therefore, its mechanization is important. The objectives of this study were to design, build, and evaluate the dynamics of a coffee-dragging device in a laboratory setting. The prototype consists of a dragging device with rods mounted on a metal plate and a chassis. Computer-aided design (CAD) software was used to generate a solid second-order tetrahedral mesh for use in finite element analyses of the device and its ...

  19. Usage of possibilities AutoCAD 2010 in operation of the engineer-designer

    OpenAIRE

    Поморцева, Елена Евгеньевна

    2012-01-01

    Questions of an intensification of work of the designers using at designing AutoCAD are considered. Passage to new level of designing at the expense of usage of new possibilities of version 2010 will allow to spare considerably time and to receive real incomes.

  20. Effect of different reconstruction algorithms on computer-aided diagnosis (CAD) performance in ultra-low dose CT colonography

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Eun Sun [Department of Radiology, Seoul National University Hospital (Korea, Republic of); Institute of Radiation Medicine, Seoul National University Hospital (Korea, Republic of); Kim, Se Hyung, E-mail: shkim7071@gmail.com [Department of Radiology, Seoul National University Hospital (Korea, Republic of); Institute of Radiation Medicine, Seoul National University Hospital (Korea, Republic of); Im, Jong Pil; Kim, Sang Gyun [Department of Internal Medicine, Seoul National University Hospital (Korea, Republic of); Shin, Cheong-il; Han, Joon Koo; Choi, Byung Ihn [Department of Radiology, Seoul National University Hospital (Korea, Republic of); Institute of Radiation Medicine, Seoul National University Hospital (Korea, Republic of)

    2015-04-15

    Highlights: •We assessed the effect of reconstruction algorithms on CAD in ultra-low dose CTC. •30 patients underwent ultra-low dose CTC using 120 and 100 kVp with 10 mAs. •CT was reconstructed with FBP, ASiR and Veo and then, we applied a CAD system. •Per-polyp sensitivity of CAD in ULD CT can be improved with the IR algorithms. •Despite of an increase in the number of FPs with IR, it was still acceptable. -- Abstract: Purpose: To assess the effect of different reconstruction algorithms on computer-aided diagnosis (CAD) performance in ultra-low-dose CT colonography (ULD CTC). Materials and methods: IRB approval and informed consents were obtained. Thirty prospectively enrolled patients underwent non-contrast CTC at 120 kVp/10 mAs in supine and 100 kVp/10 mAs in prone positions, followed by same-day colonoscopy. Images were reconstructed with filtered back projection (FBP), 80% adaptive statistical iterative reconstruction (ASIR80), and model-based iterative reconstruction (MBIR). A commercial CAD system was applied and per-polyp sensitivities and numbers of false-positives (FPs) were compared among algorithms. Results: Mean effective radiation dose of CTC was 1.02 mSv. Of 101 polyps detected and removed by colonoscopy, 61 polyps were detected on supine and on prone CTC datasets on consensus unblinded review, resulting in 122 visible polyps (32 polyps <6 mm, 52 6–9.9 mm, and 38 ≥ 10 mm). Per-polyp sensitivity of CAD for all polyps was highest with MBIR (56/122, 45.9%), followed by ASIR80 (54/122, 44.3%) and FBP (43/122, 35.2%), with significant differences between FBP and IR algorithms (P < 0.017). Per-polyp sensitivity for polyps ≥ 10 mm was also higher with MBIR (25/38, 65.8%) and ASIR80 (24/38, 63.2%) than with FBP (20/38, 58.8%), albeit without statistical significance (P > 0.017). Mean number of FPs was significantly different among algorithms (FBP, 1.4; ASIR, 2.1; MBIR, 2.4) (P = 0.011). Conclusion: Although the performance of stand-alone CAD

  1. Effect of different reconstruction algorithms on computer-aided diagnosis (CAD) performance in ultra-low dose CT colonography

    International Nuclear Information System (INIS)

    Highlights: •We assessed the effect of reconstruction algorithms on CAD in ultra-low dose CTC. •30 patients underwent ultra-low dose CTC using 120 and 100 kVp with 10 mAs. •CT was reconstructed with FBP, ASiR and Veo and then, we applied a CAD system. •Per-polyp sensitivity of CAD in ULD CT can be improved with the IR algorithms. •Despite of an increase in the number of FPs with IR, it was still acceptable. -- Abstract: Purpose: To assess the effect of different reconstruction algorithms on computer-aided diagnosis (CAD) performance in ultra-low-dose CT colonography (ULD CTC). Materials and methods: IRB approval and informed consents were obtained. Thirty prospectively enrolled patients underwent non-contrast CTC at 120 kVp/10 mAs in supine and 100 kVp/10 mAs in prone positions, followed by same-day colonoscopy. Images were reconstructed with filtered back projection (FBP), 80% adaptive statistical iterative reconstruction (ASIR80), and model-based iterative reconstruction (MBIR). A commercial CAD system was applied and per-polyp sensitivities and numbers of false-positives (FPs) were compared among algorithms. Results: Mean effective radiation dose of CTC was 1.02 mSv. Of 101 polyps detected and removed by colonoscopy, 61 polyps were detected on supine and on prone CTC datasets on consensus unblinded review, resulting in 122 visible polyps (32 polyps <6 mm, 52 6–9.9 mm, and 38 ≥ 10 mm). Per-polyp sensitivity of CAD for all polyps was highest with MBIR (56/122, 45.9%), followed by ASIR80 (54/122, 44.3%) and FBP (43/122, 35.2%), with significant differences between FBP and IR algorithms (P < 0.017). Per-polyp sensitivity for polyps ≥ 10 mm was also higher with MBIR (25/38, 65.8%) and ASIR80 (24/38, 63.2%) than with FBP (20/38, 58.8%), albeit without statistical significance (P > 0.017). Mean number of FPs was significantly different among algorithms (FBP, 1.4; ASIR, 2.1; MBIR, 2.4) (P = 0.011). Conclusion: Although the performance of stand-alone CAD

  2. CAD/CAM interface design of excimer laser micro-processing system

    Science.gov (United States)

    Jing, Liang; Chen, Tao; Zuo, Tiechuan

    2005-12-01

    Recently CAD/CAM technology has been gradually used in the field of laser processing. The excimer laser micro-processing system just identified G instruction before CAD/CAM interface was designed. However the course of designing a part with G instruction for users is too hard. The efficiency is low and probability of making errors is high. By secondary development technology of AutoCAD with Visual Basic, an application was developed to pick-up each entity's information in graph and convert them to each entity's processing parameters. Also an additional function was added into former controlling software to identify these processing parameters of each entity and realize continue processing of graphic. Based on the above CAD/CAM interface, Users can design a part in AutoCAD instead of using G instruction. The period of designing a part is sharply shortened. This new way of design greatly guarantees the processing parameters of the part is right and exclusive. The processing of complex novel bio-chip has been realized by this new function.

  3. Utilization of CAD/CAE for concurrent design of structural aircraft components

    Science.gov (United States)

    Kahn, William C.

    1993-01-01

    The feasibility of installing the Stratospheric Observatory for Infrared Astronomy telescope (named SOFIA) into an aircraft for NASA astronomy studies is investigated using CAD/CAE equipment to either design or supply data for every facet of design engineering. The aircraft selected for the platform was a Boeing 747, chosen on the basis of its ability to meet the flight profiles required for the given mission and payload. CAD models of the fuselage of two of the aircraft models studied (747-200 and 747 SP) were developed, and models for the component parts of the telescope and subsystems were developed by the various concurrent engineering groups of the SOFIA program, to determine the requirements for the cavity opening and for design configuration. It is noted that, by developing a plan to use CAD/CAE for concurrent engineering at the beginning of the study, it was possible to produce results in about two-thirds of the time required using traditional methods.

  4. OPTIMAL HYDRAULIC DESIGN AND CAD APPLICATIONS OF AXIAL FLOW HYDRAULIC TURBINE'S RUNNER

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    A method of the optimal hydraulic design and CAD application of runner blades of axial-flow hydraulic turbines are discussed on the basis of optimization principle and CAD technique in this paper. Based on the theory of fluid dynamics, the blade′s main geometrical parameter, working parameters and performances index of the blades and the relationship between them are analysed, and the mathematical model of optimal hydraulic design of axial-flow runners has been established. Through nonlinear programming, the problems can be solved. By making use of the calculation geometry and computer graphics, the distribution method of the singular points, and an CAD applied software, an optimal hydraulic design are presented.

  5. Wind Turbine Blade CAD Models Used as Scaffolding Technique to Teach Design Engineers

    Science.gov (United States)

    Irwin, John

    2013-01-01

    The Siemens PLM CAD software NX is commonly used for designing mechanical systems, and in complex systems such as the emerging area of wind power, the ability to have a model controlled by design parameters is a certain advantage. Formula driven expressions based on the amount of available wind in an area can drive the amount of effective surface…

  6. Design & Reality of CAD/CAM in Laser Beam Scanning Manufacturing System

    Institute of Scientific and Technical Information of China (English)

    SUN Jianjun; SUN Huilai; ZHAO Fangfang; LIN Shuzhong; QI Xiangyang

    2006-01-01

    In laser beam scanning manufacturing (LSM) system the PLT file was adopted as design file. The data of design file were processed by CAD software programmed. And the control model was adopted DEA control model. The DEA model was concerned with not only the distance of the two swaying mirrors, the distance between the swaying mirror and convex lens, the mirror swaying angle and the lens focal length but also the lens central height, the lens convex radius and the medium refractive index. It improved the precision and reduced the error in LBM system. The application of CAD/CAM system in LSM improved the LSM manufacturing velocity and manufacturing quality.

  7. CAD-VR geometry and meta data synchronization for design review applications

    Institute of Scientific and Technical Information of China (English)

    SCHILLING Arne; KIM Seokryul; WEISSMANN Daniel; TANG Ziying; CHOI Sangsu

    2006-01-01

    In this paper we present the MEMPHIS middleware framework for the integration of CAD geometries and assemblies with derived Virtual Reality (VR) models and its specific meta data and attributes. The goal of this work is to connect real time VR applications, especially for the Design Review, with enterprise software storing and managing CAD models (Product Data Management-PDM). The preparation of VR models requires expert knowledge, is time consuming, and includes selection of required CAD data, tessellation, healing of unwanted gaps, applying materials and textures, and special surface and light effects. During the Design Review process, decisions are made concerning the choice of materials and surface forms. While materials can be switched directly on the VR model, the modification of part geometries must be made on the CAD model. Our system synchronizes modifications of the original CAD geometries and of attributes that are relevant for the realistic rendering using the PLM Services standard. Thus, repeated work for the VR preparation can be avoided.

  8. Aerodynamic Design of Complex Configurations Using Cartesian Methods and CAD Geometry

    Science.gov (United States)

    Nemec, Marian; Aftosmis, Michael J.; Pulliam, Thomas H.

    2003-01-01

    The objective for this paper is to present the development of an optimization capability for the Cartesian inviscid-flow analysis package of Aftosmis et al. We evaluate and characterize the following modules within the new optimization framework: (1) A component-based geometry parameterization approach using a CAD solid representation and the CAPRI interface. (2) The use of Cartesian methods in the development Optimization techniques using a genetic algorithm. The discussion and investigations focus on several real world problems of the optimization process. We examine the architectural issues associated with the deployment of a CAD-based design approach in a heterogeneous parallel computing environment that contains both CAD workstations and dedicated compute nodes. In addition, we study the influence of noise on the performance of optimization techniques, and the overall efficiency of the optimization process for aerodynamic design of complex three-dimensional configurations. of automated optimization tools. rithm and a gradient-based algorithm.

  9. Efficient Use of Preisach Hysteresis Model in Computer Aided Design

    Directory of Open Access Journals (Sweden)

    IONITA, V.

    2013-05-01

    Full Text Available The paper presents a practical detailed analysis regarding the use of the classical Preisach hysteresis model, covering all the steps, from measuring the necessary data for the model identification to the implementation in a software code for Computer Aided Design (CAD in Electrical Engineering. An efficient numerical method is proposed and the hysteresis modeling accuracy is tested on magnetic recording materials. The procedure includes the correction of the experimental data, which are used for the hysteresis model identification, taking into account the demagnetizing effect for the sample that is measured in an open-circuit device (a vibrating sample magnetometer.

  10. Use of CAD systems in design of Space Station and space robots

    Science.gov (United States)

    Dwivedi, Suren N.; Yadav, P.; Jones, Gary; Travis, Elmer W.

    1988-01-01

    The evolution of CAD systems is traced. State-of-the-art CAD systems are reviewed and various advanced CAD facilities and supplementing systems being used at NASA-Goddard are described. CAD hardware, computer software, and protocols are detailed.

  11. Using AutoCAD to improve the visibility of the organizational technological design

    Directory of Open Access Journals (Sweden)

    Lebedeva Irina Mikhailovna

    2014-01-01

    Full Text Available The article describes the issue of increasing the visibility of technological solutions in organizational-technological design. The ability to visualize the main stages of building process technology contributes to organic integration of all the requirements. A special role for the harmonious perception is played by correct display of the lighting facilities, shadowing. Realistic shadows help to analyze the rooms’ insolation of the designed facility and the surrounding areas. We give a justification for the use of AutoCAD in order to automate the process of visualizing the results of organizational-technological design. The author describes the methods of obtaining realistic natural lighting in AutoCAD without significantly increasing the complexity of the process. Engineering companies in 46 % of cases use the software AutoCAD in order to create construction plans. AutoCAD has a variety of possibilities and is constantly evolving. Continuation is one of the benefits of this program. AutoCAD is unique in terms of customization, because, apart from instruction languages, it has two built-in programming languages: AutoLISP and VisualBasic. Because of these specific features AutoCAD allows to create any applications related to graphics implementation. Constant monitoring of lightning changes allows finding the appropriate in terms of aesthetics, ergonomics and insolation decisions on planning and associating a building or structure to the environment. Solar lighting is simulated by a combination of several directional lightning point sources. The author offers a brief description of the program algorithm, which allows automatically managing lighting settings and creating a file with a realistic visualization of the design solutions.

  12. Simulation tools for computer-aided design and numerical investigations of high-power gyrotrons

    Science.gov (United States)

    Damyanova, M.; Balabanova, E.; Kern, S.; Illy, S.; Sabchevski, S.; Thumm, M.; Vasileva, E.; Zhelyazkov, I.

    2012-03-01

    Modelling and simulation are essential tools for computer-aided design (CAD), analysis and optimization of high-power gyrotrons used as radiation sources for electron cyclotron resonance heating (ECRH) and current drive (ECCD) of magnetically confined plasmas in the thermonuclear reactor ITER. In this communication, we present the current status of our simulation tools and discuss their further development.

  13. Application of CAD/CAPP/CAM in design & manufacture process of mould%CAD/CAPP/CAM在模具设计制造中的应用

    Institute of Scientific and Technical Information of China (English)

    任玉珠

    2011-01-01

    模具设计与制造是一个集设计、绘图、制订工艺路线、加工制造等为一体的系列工作过程.阐述了在模具设计制造中应用CAD软件进行模具的特征三维造型设计、应用CAPP软件制订模具加工工艺规程,利用CAM软件模拟模具辅助制造"用二维代替三维""特殊工艺造型""使用混合模型""化整为零"过程,同时自动生成刀具加工时的运动轨迹(刀位文件)和数控程序的技术路线,为模具设计制造提供了先进的方法和手段,给企业模具设计制造以借鉴.%Design and manufacture of mould is a series of work flow integrating designing, drafting,formulating process routes and machining as a whole.lt elaborated on the features of three-dimensional model design of mould by applying CAD software in the process of mould design and manufacture as well as the mould processing procedure by applying CAPP software.Furthermore CAM software is utilized to simulate aided mould manufacturing process of“replacing 2D by 3D”“unique process model”“hybrid model breaking up the whole into parts” ,and motion trail (cutter location files )and technical routes of numerical control program are generated automatically during machining knife tools ,which provides advanced ways and means for design and manufacture of mould,for the reference of enterprises accordingly.

  14. Application of in-house CAD software in surface mine design and planning

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, R.; Ren, T.X.; Yu, R.; Zhang, Y.; Li, K. [University of Nottingham, Nottingham (United Kingdom)

    1998-12-31

    This paper describes the development of an in-house CAD software for surface mine design and planning. The software has a multi-module structure and is run on PCs with a friendly user interface. Its use is demonstrated through a real case, the optimization of mining planning for the super HWS surface coal mine in China. The paper emphasises the need of investment and technology for developing a new generation of CAD packages that are particularly applicable to the Chinese mining industry. 9 refs., 4 figs., 2 tabs.

  15. The Role of Flow Experience and CAD Tools in Facilitating Creative Behaviours for Architecture Design Students

    Science.gov (United States)

    Dawoud, Husameddin M.; Al-Samarraie, Hosam; Zaqout, Fahed

    2015-01-01

    This study examined the role of flow experience in intellectual activity with an emphasis on the relationship between flow experience and creative behaviour in design using CAD. The study used confluence and psychometric approaches because of their unique abilities to depict a clear image of creative behaviour. A cross-sectional study…

  16. Bilgisayar destekli diş hekimliği ve güncel CAD/CAM sistemleri

    OpenAIRE

    Gözde Çelik; Tuğrul Sarı; Aslıhan Üşümez

    2013-01-01

    CAD/CAM systems (computer aided design/computer aided manufacturing) has been used in dentistry since 1987. In the past 25 years, development of various high quality chairside and laboratory CAD/CAM systems has been continued with the progress of technology. This article describes currently used CAD/CAM systems.

    Keywords: Dental, CAD/CAM systems.

     

    ÖZET

  17. Indications for Computer-Aided Design and Manufacturing in Congenital Craniofacial Reconstruction.

    Science.gov (United States)

    Fisher, Mark; Medina, Miguel; Bojovic, Branko; Ahn, Edward; Dorafshar, Amir H

    2016-09-01

    The complex three-dimensional relationships in congenital craniofacial reconstruction uniquely lend themselves to the ability to accurately plan and model the result provided by computer-aided design and manufacturing (CAD/CAM). The goal of this study was to illustrate indications where CAD/CAM would be helpful in the treatment of congenital craniofacial anomalies reconstruction and to discuss the application of this technology and its outcomes. A retrospective review was performed of all congenital craniofacial cases performed by the senior author between 2010 and 2014. Cases where CAD/CAM was used were identified, and illustrative cases to demonstrate the benefits of CAD/CAM were selected. Preoperative appearance, computerized plan, intraoperative course, and final outcome were analyzed. Preoperative planning enabled efficient execution of the operative plan with predictable results. Risk factors which made these patients good candidates for CAD/CAM were identified and compiled. Several indications, including multisuture and revisional craniosynostosis, facial bipartition, four-wall box osteotomy, reduction cranioplasty, and distraction osteogenesis could benefit most from this technology. We illustrate the use of CAD/CAM for these applications and describe the decision-making process both before and during surgery. We explore why we believe that CAD/CAM is indicated in these scenarios as well as the disadvantages and risks. PMID:27516839

  18. Some Workplace Effects of CAD and CAM.

    Science.gov (United States)

    Ebel, Karl-H.; Ulrich, Erhard

    1987-01-01

    Examines the impact of computer-aided design (CAD) and computer-aided manufacturing (CAM) on employment, work organization, working conditions, job content, training, and industrial relations in several countries. Finds little evidence of negative employment effects since productivity gains are offset by various compensatory factors. (Author/CH)

  19. Aids to School Bus Design

    Science.gov (United States)

    1991-01-01

    Navistar International Transportation Corporation, Chicago, IL, used three separate NASA-developed technologies in the design and testing of their 3000 Series Bus Chassis which was developed expressly for school bus applications. For structural analysis, they used the MSC/NASTRAN program which mathematically analyzes a design and predicts how it will hold up under stress. They also used the SPATE 9000 system for non-contact measurement of stress, load transfer mechanisms, detection of hidden flaws, and monitoring structural changes during fatigue testing. SPATE 9000 was based on infrared stress measurement technology developed by Langley Research Center. They also employed the Wyle Ride Quality Meter, which was developed by Langley to aid in passenger aircraft design by providing an accurate measurement of ride vibration and sound level. These numbers translate into a subjective discomfort level index. These technologies contribute to the company's 45-48 percent share of the school bus chassis market.

  20. CEGB intergraph computer aided design system as an aid for the navigation of remote manipulators

    International Nuclear Information System (INIS)

    Computer Aided Design Systems with 3D Graphic capability can offer substantial benefits for the simulation and navigation of remote manipulators. The CEGB has been experimenting with its own Corporate INTERGRAPH CAD Network using as an example a remote links manipulator working within the above gas baffle dome area of an Advanced Gas Cooled Reactor. A report of this work is presented together with graphic simulations of the manipulator within the above dome area and reconstructions of images anticipated from the on board cameras. Future improvements in the speed of graphic processing will enable these techniques to be used for the on-line navigation of manipulators, as an aid to the interpretation of video images and for the training of operators without the need for full size test and training facilities. (author)

  1. COLLABORATIVE CAD MODELING PROCESS ANALYSIS TO SUPPORT TEAMWORK FOR BUILDING DESIGN

    Directory of Open Access Journals (Sweden)

    Sérgio SCHEER

    2009-05-01

    Full Text Available Collaborative tools are information systems which allow document sharing through local area networks, intranets and extranets. Collaborative design can be a solution to increase the productivity and the final quality of the product in a building design office. In this way it is possible to assure the information integration and also the data integrity during the design process based on computer network communication. The goal of this article is to analyze how one CAD system based on BIM concept (ArchiCAD software - Graphisoft/Nemetschek can support a collaborative teamwork structured on an integrated model for different design views. In this model, the tasks are assigned by a coordinator and executed by the designers in different places following the client-service scheme. It is intended to contribute with the diffusion of this information technology tool and to present its potentiality for the improvement of the design performance. The research method used was a case study of the development design. In this case study, communication guidelines had been applied to verify the software behavior in relation to the task execution in a shared framework. The use of the collaborative CAD modeling in the development design provided information sharing, track and control of document versions and also the integration of design modifications in such automatic and simultaneous way between different computers used.

  2. SYSTEM FOR TORQUE CONVERTER DESIGN AND ANALYSIS BASED ON CAD/CFD INTEGRATED PLATFORM

    Institute of Scientific and Technical Information of China (English)

    WU Guangqiang; YAN Peng

    2008-01-01

    A 3D torque converter design system is developed based on numerical investigation into flow field and CAD technology. The 3D steady-state flow field simulation is undertaken by using time averaged Reynolds equation and k-epsilon turbulence model, with mixing-plane boundary conditions at three section interfaces. The blades are designed according to the flow field characteristics by using a reverse design method in the system. The accurateness of numerical analysis and the validity of design system are verified by the fluid field experiment of desingn example of the torque converter. This kind of design and analysis system for torque converter based on integration of comput ationol fluid dynamics (CFD) and CAD is a powerful tool for torque converter manufacturing, but also a prettg important significance for research and development.

  3. Computer Aided Design in England

    DEFF Research Database (Denmark)

    Grau, K.(red.); Sigrist, F.(red.)

    Meddelelsen, der er på engelsk, bringer i fortsættelse af SBI-meddelelse 41 redigerede uddrag af leverandørernes introduktionsmateriale til seks CAD-systemer. Materialet indeholder værdifulde redegørelser for systemernes principielle opbygning og deres praktiske funktion og ydeevne....

  4. Study on glass infiltrated alumina(GIA) ceramic for CAD/CAM

    Institute of Scientific and Technical Information of China (English)

    LI Mingzhe; LI Hong; WANG Wei; Zhao Yunfeng

    2001-01-01

    @@ With the rapid development of computer technique , Computer aided design(CAD) and computer aided manufacturing(CAM) or computer integrated manufacturing(CIM) has became an alternative to the conventional technique for producingdental restorations.

  5. Benefits of using CAD/CAM for design, draughting and prototype production of automotive instrumentation parts

    Energy Technology Data Exchange (ETDEWEB)

    Morgan, N.A.

    1982-01-01

    The paper will describe the work untertaken in the company over the last five years. This work now enables us to take a design concept through to volume production in about 12 months and delivery of prototypes 3-4 months from the start of design. This was not possible prior to the introduction of the CAD/CAM equipment. The C.A.D. graphics system will be described in terms of its method of use by designers, draughtsmen and part programmers. All these people use a common database to ensure validity of design. The C.A.M. operation on C.N.C.Milling machines will be described also, and indications given of future areas of work on this project. These will relate to tool manufacture using the same database.

  6. Catheter detection and classification on chest radiographs: an automated prototype computer-aided detection (CAD) system for radiologists

    Science.gov (United States)

    Ramakrishna, Bharath; Brown, Matthew; Goldin, Jonathan; Cagnon, Chris; Enzmann, Dieter

    2011-03-01

    Chest radiographs are the quickest and safest method to check placement of man-made medical devices placed in the body like catheters, stents and pacemakers etc out of which catheters are the most commonly used devices. The two most often used catheters especially in the ICU are the Endotracheal (ET) tube used to maintain patient's airway and the Nasogastric (NG) tube used to feed and administer drugs. Tertiary ICU's typically generate over 250 chest radiographs per day to confirm tube placement. Incorrect tube placements can cause serious complications and can even be fatal. The task of identifying these tubes on chest radiographs is difficult for radiologists and ICU personnel given the high volume of cases. This motivates the need for an automatic detection system to aid radiologists in processing these critical cases in a timely fashion while maintaining patient safety. To-date there has been very little research in this area. This paper develops a new fully automatic prototype computer-aided detection (CAD) system for detection and classification of catheters on chest radiographs using a combination of template matching, morphological processing and region growing. The preliminary evaluation was carried out on 25 cases. The prototype CAD system was able to detect ET and NG tubes with sensitivities of 73.7% and 76.5% respectively and with specificities of 91.3% and 84.0% respectively. The results from the prototype system show that it is feasible to automatically detect both catheters on chest radiographs, with the potential to significantly speed the delivery of imaging services while maintaining high accuracy.

  7. Computer-aided system design

    Science.gov (United States)

    Walker, Carrie K.

    1991-01-01

    A technique has been developed for combining features of a systems architecture design and assessment tool and a software development tool. This technique reduces simulation development time and expands simulation detail. The Architecture Design and Assessment System (ADAS), developed at the Research Triangle Institute, is a set of computer-assisted engineering tools for the design and analysis of computer systems. The ADAS system is based on directed graph concepts and supports the synthesis and analysis of software algorithms mapped to candidate hardware implementations. Greater simulation detail is provided by the ADAS functional simulator. With the functional simulator, programs written in either Ada or C can be used to provide a detailed description of graph nodes. A Computer-Aided Software Engineering tool developed at the Charles Stark Draper Laboratory (CSDL CASE) automatically generates Ada or C code from engineering block diagram specifications designed with an interactive graphical interface. A technique to use the tools together has been developed, which further automates the design process.

  8. Concurrent Design Study of the Petroleum Equipment CAD System

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Military petroleum equipment, as the special device a nd tool for petroleum storage, transportation, filling, chemical analysis, detec tion and maintenance for the army, is an important means and basis of petroleum indemnificatory. To adapt to modern war in high-tech conditions, the petroleum equipment have to develop towards higher reliability, adaptability, maneuverabil ity, standardization, container and cell type with versatile multi-functions. As a new design theory and design process, concur...

  9. From CAD to Robot: Undergraduate Capstone Design in Engineering Technology

    Directory of Open Access Journals (Sweden)

    Kuldeep S. Rawat

    2013-06-01

    Full Text Available A novel senior project in designing and implementing a wheeled platform-based experimental mobile robot is discussed. This mobile robot design project was used as a platform to learn sensor interfacing, microcontroller programming, motor control, and electronic circuit design and troubleshooting. A specially designed proto board was used so that students could experiment with various types of sensors and supporting electronic circuitry. The modules implemented in this project are, servo motor control, infrared (IR-based obstacle detection and avoidance, temperature sensing, and IR wireless communication. An 8-bit Peripheral Interface Controller (PIC microcontroller, operating at 20MHz, was used as a programmable controller to monitor external environment through sensors and make appropriate decisions. PIC microcontroller was programmed using PICBasic PRO, a BASIC like high-level language. The implementation was divided into separate experiments, through which the students progressively completed the mobile robot. This progressive experimentation helped students develop their knowledge of interfacing, microcontroller programming, electronic control, circuit design, and troubleshooting in an incremental manner. The robot design experiments, sensor interfacing, electronic control, supporting circuitry, problems faced and troubleshooting during implementation are discussed in the paper.

  10. CAD System Dedicated to the Design of Sport Bike Frame Structure

    Institute of Scientific and Technical Information of China (English)

    Wang Jianhua; Yang Wentong; Hu Fenglai; Wang Dakang

    2001-01-01

    This article aims to discuss the design process of the CAD system dedicated for sport bikeflame stracture, introducing in detail its design concept and the scheme of implementation. Based onthe different usages of sport bikes and the requirements on the system made out by Beijing HanglunSport Apparatus Company Limited. Structural analysis on two types of bikes' frames is carried out.The system defines the basic design parameters and analyses the constraint conditions. Thencalculating formulas with constraint conditions are derived. The system solves equations with VisualC++ program, realizes input of the original data and output of the results through interactive system.With AutoCAD14.0 as the platform, the system uses VC++ and ObjectARX to realize auto output ofbike frame graphics. The system has been put into use. Practice has affirmed that the system'sconvenience, applicability and reliability all have reached the expected goal.

  11. TGeoCad: an Interface between ROOT and CAD Systems

    International Nuclear Information System (INIS)

    In the simulation of High Energy Physics experiment a very high precision in the description of the detector geometry is essential to achieve the required performances. The physicists in charge of Monte Carlo Simulation of the detector need to collaborate efficiently with the engineers working at the mechanical design of the detector. Often, this collaboration is made hard by the usage of different and incompatible software. ROOT is an object-oriented C++ framework used by physicists for storing, analyzing and simulating data produced by the high-energy physics experiments while CAD (Computer-Aided Design) software is used for mechanical design in the engineering field. The necessity to improve the level of communication between physicists and engineers led to the implementation of an interface between the ROOT geometrical modeler used by the virtual Monte Carlo simulation software and the CAD systems. In this paper we describe the design and implementation of the TGeoCad Interface that has been developed to enable the use of ROOT geometrical models in several CAD systems. To achieve this goal, the ROOT geometry description is converted into STEP file format (ISO 10303), which can be imported and used by many CAD systems

  12. Development of reactor design aid tool using virtual reality technology

    International Nuclear Information System (INIS)

    A new type of aid system for fusion reactor design, to which the virtual reality (VR) visualization and sonification techniques are applied, is developed. This system provides us with an intuitive interaction environment in the VR space between the observer and the designed objects constructed by the conventional 3D computer-aided design (CAD) system. We have applied the design aid tool to the heliotron-type fusion reactor design activity FFHR2m [A. Sagara, S. Imagawa, O. Mitarai, T. Dolan, T. Tanaka, Y. Kubota, et al., Improved structure and long -life blanket concepts for heliotron reactors, Nucl. Fusion 45 (2005) 258-263] on the virtual reality system CompleXcope [Y. Tamura, A. Kageyama, T. Sato, S. Fujiwara, H. Nakamura, Virtual reality system to visualize and auralize numerical imulation data, Comp. Phys. Comm. 142 (2001) 227-230] of the National Institute for Fusion Science, Japan, and have evaluated its performance. The tool includes the functions of transfer of the observer, translation and scaling of the objects, recording of the operations and the check of interference

  13. GenoCAD Plant Grammar to Design Plant Expression Vectors for Promoter Analysis.

    Science.gov (United States)

    Coll, Anna; Wilson, Mandy L; Gruden, Kristina; Peccoud, Jean

    2016-01-01

    With the rapid advances in prediction tools for discovery of new promoters and their cis-elements, there is a need to improve plant expression methodologies in order to facilitate a high-throughput functional validation of these promoters in planta. The promoter-reporter analysis is an indispensible approach for characterization of plant promoters. It requires the design of complex plant expression vectors, which can be challenging. Here, we describe the use of a plant grammar implemented in GenoCAD that will allow the users to quickly design constructs for promoter analysis experiments but also for other in planta functional studies. The GenoCAD plant grammar includes a library of plant biological parts organized in structural categories to facilitate their use and management and a set of rules that guides the process of assembling these biological parts into large constructs. PMID:27557770

  14. Supporting Product Family Design in a 3D CAD/PDM Integrated System

    Institute of Scientific and Technical Information of China (English)

    ZHANG Fen; CHEN Zhuo-ning; YAN Xiao-guang; BIN Hong-zan

    2006-01-01

    This paper addresses some key issues in supporting product family design in a 3D CAD/PDM integrated system and introduces the techniques developed or adopted in building the integrated system. The general architecture of a 3D CAD/PDM integrated system is organized as five tiers. Multi-agent technology is applied with a collaborative design environment. The rule-based product family architecture (PFA) and tabular layouts of article characteristics (TLAC) technique are applied to represent the knowledge for product families. They make the knowledge understandable, simplified and can be exchanged among heterogeneous information systems. A transparently concentric integrated mode is put forward to enable the heterogeneous processes to interact and communicate regardless of the language used to construct each process. With the mode, function calling and information exchanging among different processes are carried out via message translation/parse approach. Currently, the integrated system is implemented in the platform of Windows NT and 2000.

  15. Tool application CAD / CAM for design and construction of a prototype of plastic injection mold

    Directory of Open Access Journals (Sweden)

    Albert Miyer Suárez Castrillón

    2015-11-01

    Full Text Available The study, development and production of injection molds comes with the implementation of CAD and CAM tools available on the market; using these tools, a prototype injection mold for thermoplastic materials was designed and built, based on a mold is injection in the laboratory of the University of Pamplona, in which a couple of modifications were made in order to experiment with its design. The prototype was manufactured through a 3D scan of the original mold to provide the CAD / CAM files with the simulated 3D printing technique for performing an experimental study with the prototype for adjusting temperature and pressure sensors and for coatings metallic materials for use in the injection molding process.

  16. PLAID- A COMPUTER AIDED DESIGN SYSTEM

    Science.gov (United States)

    Brown, J. W.

    1994-01-01

    PLAID is a three-dimensional Computer Aided Design (CAD) system which enables the user to interactively construct, manipulate, and display sets of highly complex geometric models. PLAID was initially developed by NASA to assist in the design of Space Shuttle crewstation panels, and the detection of payload object collisions. It has evolved into a more general program for convenient use in many engineering applications. Special effort was made to incorporate CAD techniques and features which minimize the users workload in designing and managing PLAID models. PLAID consists of three major modules: the Primitive Object Generator (BUILD), the Composite Object Generator (COG), and the DISPLAY Processor. The BUILD module provides a means of constructing simple geometric objects called primitives. The primitives are created from polygons which are defined either explicitly by vertex coordinates, or graphically by use of terminal crosshairs or a digitizer. Solid objects are constructed by combining, rotating, or translating the polygons. Corner rounding, hole punching, milling, and contouring are special features available in BUILD. The COG module hierarchically organizes and manipulates primitives and other previously defined COG objects to form complex assemblies. The composite object is constructed by applying transformations to simpler objects. The transformations which can be applied are scalings, rotations, and translations. These transformations may be defined explicitly or defined graphically using the interactive COG commands. The DISPLAY module enables the user to view COG assemblies from arbitrary viewpoints (inside or outside the object) both in wireframe and hidden line renderings. The PLAID projection of a three-dimensional object can be either orthographic or with perspective. A conflict analysis option enables detection of spatial conflicts or collisions. DISPLAY provides camera functions to simulate a view of the model through different lenses. Other

  17. Nano-scale CMOS analog circuits models and CAD techniques for high-level design

    CERN Document Server

    Pandit, Soumya; Patra, Amit

    2014-01-01

    Reliability concerns and the limitations of process technology can sometimes restrict the innovation process involved in designing nano-scale analog circuits. The success of nano-scale analog circuit design requires repeat experimentation, correct analysis of the device physics, process technology, and adequate use of the knowledge database.Starting with the basics, Nano-Scale CMOS Analog Circuits: Models and CAD Techniques for High-Level Design introduces the essential fundamental concepts for designing analog circuits with optimal performances. This book explains the links between the physic

  18. Sharing the learning activity using intelligent CAD

    DEFF Research Database (Denmark)

    Duffy, S. M.; Duffy, Alex

    1996-01-01

    In this paper the need for Intelligent Computer Aided Design (Int.CAD) to jointly support design and learning assistance is introduced. The paper focuses on presenting and exploring the possibility of realizing ''learning'' assistance in Int.CAD by introducing a new concept called Shared Learning....... Shared Learning is proposed to empower CAD tools with more useful learning capabilities than that currently available and thereby provide a stronger interaction of learning between a designer and a computer. ''Controlled'' computational learning is proposed as a means whereby the Shared Learning concept...... how a designer and PERSPECT can jointly learn. There is still much work to be done before the full potential of Shared Learning can be realized. However, the authors do believe that the concept of Shared Learning may hold the key to truly empowering learning in Int.CAD....

  19. Challenges in IC design for hearing aids

    DEFF Research Database (Denmark)

    Jørgensen, Ivan Harald Holger

    2012-01-01

    Designing modern hearing aids is a formidable challenge. The size of hearing aids is constantly decreasing, making them virtually invisible today. Still, as in all other modern electronics, more and more features are added to these devices driven by the development in modern IC technology....... The demands for performance and features at very low supply voltage and power consumption constantly prove a challenge to the physical design of hearing aids and not at least the design of the ICs for these. As a result of this all large hearing aid manufacturers use fully customized ASICs in their products...... to produce a competitive advantage. This presentation will give a brief insight into the hearing aid market and industry, a brief view of the historic development of hearing aids and an introduction to how a modern hearing is constructed showing the amplifier as the key component in the modern hearing aid...

  20. Three-dimensional computer-aided design system for plant layout

    International Nuclear Information System (INIS)

    A three-dimensional CAD system for plant layout of nuclear power plants has been developed, adopting the latest technologies of knowledge engineering, CAD/CAM, and interactive computer graphics. With this system, Hitachi is now able to plan plant layout more effectively, reduce design time and cost, and detect defective designs before actual construction problems occur. Hitachi is planning to enhance this three-dimensional CAD system to a plant total life computer-aided engineering (CAE) system. This system will include a construction CAE system, a test operation and in-service inspection control system, and a plant maintenance system. After completion of this system, Hitachi will be able to plan, monitor, and control all major aspects in the life of a nuclear power plant from the very first stage of the planning to its decommissioning

  1. The Use of a Parametric Feature Based CAD System to Teach Introductory Engineering Graphics.

    Science.gov (United States)

    Howell, Steven K.

    1995-01-01

    Describes the use of a parametric-feature-based computer-aided design (CAD) System, AutoCAD Designer, in teaching concepts of three dimensional geometrical modeling and design. Allows engineering graphics to go beyond the role of documentation and communication and allows an engineer to actually build a virtual prototype of a design idea and…

  2. An evaluation of computer aided design of below-knee prosthetic sockets.

    Science.gov (United States)

    Topper, A K; Fernie, G R

    1990-12-01

    Forty-eight below-knee amputees compared sockets designed using CANFIT computer aided design (CAD) software with sockets designed using conventional methods. Each subject was fitted by one prosthetist who used conventional techniques and one who used the CANFIT system to design the socket. Prosthetists alternated design methods for each new subject. The prosthetist using the conventional techniques was allowed up to 2 design attempts and the prosthetist using the CANFIT system was allowed up to 5 design attempts. After 2 design attempts with each method 21% of the subjects preferred the CANFIT design socket. Following up to 5 attempts 54% preferred the CANFIT designed socket. A jury of experts made an assessment of the CANFIT system and of CAD in prosthetics. The jury did not think that the version of the system tested was cost effective but that at the rate that it was improving it would become such within 3 to 5 years. The jury noted that, as well as monetary benefits, CAD presents the possibility of benefits in other areas such as research and teaching. A number of specific suggestions regarding the use and development of CAD in prosthetics were also made.

  3. Computer Aided Design of the Link-Fork Head-Piston Assembly of the Kaplan Turbine with Solidworks

    Directory of Open Access Journals (Sweden)

    Camelia Jianu

    2010-10-01

    Full Text Available The paper presents the steps for 3D computer aided design (CAD of the link-fork head-piston assembly of the Kaplan turbine made in SolidWorks.The present paper is a tutorial for a Kaplan turbine assembly 3D geometry, which is dedicated to the Assembly design and Drawing Geometry and Drawing Annotation.

  4. Industrial Robotics Platform for Simulation Design, Planning and Optimization based on Off-line CAD Programming

    Directory of Open Access Journals (Sweden)

    Baizid Khelifa

    2016-01-01

    Full Text Available This paper presents IRoSim: Industrial Robotics Simulation Design Planning and Optimization platform which we developed based on SolidWorks API. The main objective is to integrate features from mechanical and robotics CAD software into the same platform in order to facilitate the development process through a friendly interaction interface. The platform provides important steps to develop a given robotized task such as: defining a given task, CAD learning of the end-effectors’ trajectory, checking the manipulator’s reach-ability to perform a task, simulating the motion and preventing the trajectory from possible collisions. To assess the usability of the proposed platform, a car’s doors painting task using a 6 Degree Of Freedom industrial manipulator has been developed.

  5. A QFD-based decision making model for computer-aided design software selection

    Directory of Open Access Journals (Sweden)

    Kanika Prasad

    2016-03-01

    Full Text Available With the progress in technology and innovation in product development, the contribution of computer- aided design (CAD software in the design and manufacture of parts/products is growing on significantly. Selection of an appropriate CAD software is not a trifling task as it involves analyzing the appositeness of the available software packages to the unique requirements of the organization. Existence of a large number of CAD software vendors, presence of discordance among different hardware and software systems, and dearth of technical knowledge and experience of the decision makers further complicate the selection procedure. Moreover, there are very few published research papers related to CAD software selection, and majority of them have either employed criteria weights computed utilizing subjective judgements of the end users or floundered to incorporate the voice of customers in the decision making process. Quality function deployment (QFD is a well-known technique for determining the relative importance of customers’ defined criteria for selection of any product or service. Therefore, this paper deals with design and development of a QFD-based decision making model in Visual BASIC 6.0 for selection of CAD software for manufacturing organizations. In order to demonstrate the applicability and potentiality of the developed model in the form of a software prototype, two illustrative examples are also provided.

  6. Object-oriented CAD data-base support for software reusability in computer-aided software engineering environments

    Energy Technology Data Exchange (ETDEWEB)

    Poulin, J.S.

    1989-01-01

    There is currently a large research effort underway to develop new techniques and methods for the efficient development of software. However, much of this effort ignores the vast sum of knowledge that has been acquired through the experiences in the field of engineering CAD, especially in the area of VLSI design. Much of what has been learned in this area centers on database support for the design process, and in particular, efficient object-oriented modeling techniques for software design data. It is believed that the data model for software is a central issue surrounding the development of CASE systems. Recognizing that great gains in software productivity will be realized only when software developed for one application is reused in subsequent applications, it is necessary to consider ways to support reuse through the data model used in these CASE environments. Awareness of these reusability issues has led to the development of a new object-oriented semantic data model for use in CASE environments. The proposed semantic data model for software is based on the molecular object model used in CAD, but has been enhanced to capture and support more of the software development cycle. The model differs from the molecular object model in that where the molecular model defines an object as being composed of only an interface and an implementation, this model distinguishes between the interface used for defining an object and an interface that is used to call an object. The comprehensive model structure incorporates a classification and retrieval mechanism designed to help map conceptual requirements to existing components in the software archive.

  7. Design and development of a quad copter (UMAASK) using CAD/CAM/CAE

    Science.gov (United States)

    Manarvi, Irfan Anjum; Aqib, Muhammad; Ajmal, Muhammad; Usman, Muhammad; Khurshid, Saqib; Sikandar, Usman

    Micro flying vehicles1 (MFV) have become a popular area of research due to economy of production, flexibility of launch and variety of applications. A large number of techniques from pencil sketching to computer based software are being used for designing specific geometries and selection of materials to arrive at novel designs for specific requirements. Present research was focused on development of suitable design configuration using CAD/CAM/CAE tools and techniques. A number of designs were reviewed for this purpose. Finally, rotary wing Quadcopter flying vehicle design was considered appropriate for this research. Performance requirements were planned as approximately 10 meters ceiling, weight less than 500grams and ability to take videos and pictures. Parts were designed using Finite Element Analysis, manufactured using CNC machines and assembled to arrive at final design named as UMAASK. Flight tests were carried out which confirmed the design requirements.

  8. Update on CAD/CAM activities at Sandia Laboratories

    Energy Technology Data Exchange (ETDEWEB)

    Oliver, D.A.

    1977-09-01

    Development of systems for Computer-Aided Design and Computer-Aided Manufacturing (CAD/CAM) has been underway at Sandia Laboratories for several years. These include systems for circuit design and analysis, systems for design and fabrication of printed circuit boards and hybrid microcircuits, and systems for mechanical applications, such as mass properties calculations and stress analysis. CAD/CAM operations have proved successful for electronic applications. Current emphasis is on development of mechanical support software, and with putting into production a machine-aided design and definition system (MADDS) utilizing Applicon Graphics Systems (AGS). 14 figures. (RWR)

  9. Fracture resistance of computer-aided design/computer-aided manufacturing-generated composite resin-based molar crowns.

    Science.gov (United States)

    Harada, Akio; Nakamura, Keisuke; Kanno, Taro; Inagaki, Ryoichi; Örtengren, Ulf; Niwano, Yoshimi; Sasaki, Keiichi; Egusa, Hiroshi

    2015-04-01

    The aim of this study was to investigate whether different fabrication processes, such as the computer-aided design/computer-aided manufacturing (CAD/CAM) system or the manual build-up technique, affect the fracture resistance of composite resin-based crowns. Lava Ultimate (LU), Estenia C&B (EC&B), and lithium disilicate glass-ceramic IPS e.max press (EMP) were used. Four types of molar crowns were fabricated: CAD/CAM-generated composite resin-based crowns (LU crowns); manually built-up monolayer composite resin-based crowns (EC&B-monolayer crowns); manually built-up layered composite resin-based crowns (EC&B-layered crowns); and EMP crowns. Each type of crown was cemented to dies and the fracture resistance was tested. EC&B-layered crowns showed significantly lower fracture resistance compared with LU and EMP crowns, although there was no significant difference in flexural strength or fracture toughness between LU and EC&B materials. Micro-computed tomography and fractographic analysis showed that decreased strength probably resulted from internal voids in the EC&B-layered crowns introduced by the layering process. There was no significant difference in fracture resistance among LU, EC&B-monolayer, and EMP crowns. Both types of composite resin-based crowns showed fracture loads of >2000 N, which is higher than the molar bite force. Therefore, CAD/CAM-generated crowns, without internal defects, may be applied to molar regions with sufficient fracture resistance. PMID:25683749

  10. An application protocol for CAD to CAD transfer of electronic information

    Science.gov (United States)

    Azu, Charles C., Jr.

    1993-01-01

    The exchange of Computer Aided Design (CAD) information between dissimilar CAD systems is a problem. This is especially true for transferring electronics CAD information such as multi-chip module (MCM), hybrid microcircuit assembly (HMA), and printed circuit board (PCB) designs. Currently, there exists several neutral data formats for transferring electronics CAD information. These include IGES, EDIF, and DXF formats. All these formats have limitations for use in exchanging electronic data. In an attempt to overcome these limitations, the Navy's MicroCIM program implemented a project to transfer hybrid microcircuit design information between dissimilar CAD systems. The IGES (Initial Graphics Exchange Specification) format is used since it is well established within the CAD industry. The goal of the project is to have a complete transfer of microelectronic CAD information, using IGES, without any data loss. An Application Protocol (AP) is being developed to specify how hybrid microcircuit CAD information will be represented by IGES entity constructs. The AP defines which IGES data items are appropriate for describing HMA geometry, connectivity, and processing as well as HMA material characteristics.

  11. Computer aided design around the A 300 Airbus

    International Nuclear Information System (INIS)

    More than thirteen years after the launching of the first AIRBUS development a survey of CAD/CAM introduction and operation at AEROSPATIALE, Aircraft Division, is conducted. The following points are reviewed: - short description of AEROSPATIALE Aircraft Division - technical level and limits reached with the Concorde programm - first CAD experience and the decision to proceed and generalize CAD/CAM techniques towards computer aided engineering (CAE) - CAE basic concepts. Then is shown the implementation of CAE in the structural, aerodynamic and electrical fields in response to the growing success of the various Airbus programs and in front of an everyday tougher competition. After a description of the to-day situation and a first estimate of CAE benefits, special attention is devoted to the difficulties encountered with both hardware and software used in the system involved. To conclude and attempt is made to define the respective roles of the system buyer and vendor in the CAD/CAM field. (orig.)

  12. Evaluation of biogeneric design techniques with CEREC CAD/CAM system

    Science.gov (United States)

    2015-01-01

    PURPOSE The aim of this study was to evaluate occlusal contacts generated by 3 different biogeneric design modes (individual (BI), copy (BC), reference (BR)) of CEREC software and to assess the designs subjectively. MATERIALS AND METHODS Ten pairs of maxillary and mandibular casts were obtained from full dentate individuals. Gypsum cast contacts were quantified with articulating paper and digital impressions were taken. Then, all ceramic crown preparation was performed on the left first molar teeth and digital impressions of prepared teeth were made. BI, BC, and BR crowns were designed. Occlusal images of designs including occlusal contacts were superimposed on the gypsum cast images and corresponding contacts were determined. Three designs were evaluated by the students. RESULTS The results of the study revealed that there was significant difference among the number of contacts of gypsum cast and digital models (P<.05). The comparison of the percentage of virtual contacts of three crown designs which were identical to the contacts of original gypsum cast revealed that BI and BR designs showed significantly higher percentages of identical contacts compared with BC design (P<.05). Subjective assessment revealed that students generally found BI designs and BR designs natural regarding naturalness of fissure morphology and cusp shape and cusp tip position. For general occlusal morphology, student groups generally found BI design "too strong" or "perfect", BC design "too weak", and BR design "perfect". CONCLUSION On a prepared tooth, three different biogeneric design modes of a CAD/CAM software reveals different crown designs regarding occlusal contacts and morphology. PMID:26816572

  13. Design and Implementation of an Integrated CAD/CAPP System Based on PDM

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Product data management (PDM) is a new technique that is developed from database management system (DBMS) to manage the information and the associated procedure of a product. Many design engineers have employed PDM tools to coordinate and control access to documented versions of product designs. But it is still a focus of research efforts in industry and academic how to further build an efficient and effective integrated product/process development environments (IPDEs) based on PDM to meet requirements of enterprises. This paper introduces the approach to design and implementation of an integrated CAD/CAPP system (IC2S) based on PDM. This system is an important compent of computer integrated manufacturing system in KELON Inc(Kelon-CIMS). It is mainly used to support for the design and development of the home electric appliances (HEA).

  14. Computer aided design on the Tandem Mirror Experiment Upgrade (TMX-U)

    International Nuclear Information System (INIS)

    The Tandem Mirror Experiment-Upgrade (TMX-U) at Lawrence Livermore National Laboratory (LLNL) has been using a Computer Aided Design (CAD) graphics system to enhance its design capabilities since November of 1984. Three-dimensional models of the TMX-U magnet set, neutral beams, plasma, and containment vessel have been modeled on the system. These models are used for location verification, diagnostic placement, interference checking, and visualization of complex shapes generated on the Magnetic Fusion Energy Computer Center (MFECC) mainframes. The graphics system used at LLNL is a Computervision multi-application graphics system. Four other fusion laboratories, Princeton, Oak Ridge, General Atomic, and Los Alamos, have purchased this same CAD system. These sites are linked through the MFE computer network to allow for the exchange of design files and the transfer of physics and engineering data to and from the CAD systems. This paper gives examples of how the CAD system has been used to solve design and engineering problems for the TMX-U

  15. Computer-aided detection (CAD) as a second reader using perspective filet view at CT colonography: effect on performance of inexperienced readers

    Energy Technology Data Exchange (ETDEWEB)

    Fisichella, V.A. [Department of Radiology, Sahlgrenska University Hospital and Sahlgrenska Academy at University of Gothenburg, Gothenburg (Sweden)], E-mail: valeria.fisichella@vgregion.se; Jaederling, F. [Department of Radiology, St. Goeran' s Hospital, Stockholm (Sweden); Horvath, S. [Department of Radiology, Sahlgrenska University Hospital and Sahlgrenska Academy at University of Gothenburg, Gothenburg (Sweden); Stotzer, P.-O.; Kilander, A. [Department of Gastroenterology, Sahlgrenska University Hospital, Gothenburg (Sweden); Bath, M. [Department of Medical Physics and Biomedical Engineering, Sahlgrenska University Hospital, Gothenburg (Sweden); Hellstroem, M. [Department of Radiology, Sahlgrenska University Hospital and Sahlgrenska Academy at University of Gothenburg, Gothenburg (Sweden)

    2009-10-15

    Aim: To evaluate whether computer-aided detection (CAD) as a second reader using perspective filet view [three-dimensional (3D) filet] improves the performance of inexperienced readers at computed tomography colonography (CTC) compared with unassisted 3D filet and unassisted two-dimensional (2D) CTC. Material and methods: Fifty symptomatic patients underwent CTC and same-day colonoscopy with segmental unblinding. Two inexperienced readers read the CTC studies on 3D filet and 2D several weeks apart. Four months later, readers re-read the cases only evaluating CAD marks using 3D filet. Suspicious CAD marks not previously described on 3D filet were recorded. Jackknife free-response receiver operating characteristic (JAFROC-1) analysis was used to compare the observers' performances in detecting lesions with 3D filet, 2D and 3D filet with CAD. Results: One hundred and three lesions {>=}3 mm were detected at colonoscopy with segmental unblinding. CAD alone had a sensitivity of 73% (75/103) at a mean false-positive rate per patient of 12.8 in supine and 11.4 in prone. For inexperienced readers sensitivities with 3D filet with CAD were 58% (60/103) and 48% (50/103) with an improvement of 14-16 percentage points (p < 0.05) compared with 2D and of 10-11 percentage points (p < 0.05) compared with 3D filet. For inexperienced readers, the false-positive rate was 25-41% and 71-200% higher with 3D filet with CAD compared with 3D filet and 2D, respectively. JAFROC-1 analysis showed no significant differences in per-lesion overall performance among reading modes (p = 0.8). Conclusion: CAD applied as a second reader using 3D filet increased both sensitivity and the number of false positives by inexperienced readers compared with 3D filet and 2D, thus not improving overall performance, i.e., the ability to distinguish between lesions and non-lesions.

  16. Computer-aided detection (CAD) as a second reader using perspective filet view at CT colonography: effect on performance of inexperienced readers

    International Nuclear Information System (INIS)

    Aim: To evaluate whether computer-aided detection (CAD) as a second reader using perspective filet view [three-dimensional (3D) filet] improves the performance of inexperienced readers at computed tomography colonography (CTC) compared with unassisted 3D filet and unassisted two-dimensional (2D) CTC. Material and methods: Fifty symptomatic patients underwent CTC and same-day colonoscopy with segmental unblinding. Two inexperienced readers read the CTC studies on 3D filet and 2D several weeks apart. Four months later, readers re-read the cases only evaluating CAD marks using 3D filet. Suspicious CAD marks not previously described on 3D filet were recorded. Jackknife free-response receiver operating characteristic (JAFROC-1) analysis was used to compare the observers' performances in detecting lesions with 3D filet, 2D and 3D filet with CAD. Results: One hundred and three lesions ≥3 mm were detected at colonoscopy with segmental unblinding. CAD alone had a sensitivity of 73% (75/103) at a mean false-positive rate per patient of 12.8 in supine and 11.4 in prone. For inexperienced readers sensitivities with 3D filet with CAD were 58% (60/103) and 48% (50/103) with an improvement of 14-16 percentage points (p < 0.05) compared with 2D and of 10-11 percentage points (p < 0.05) compared with 3D filet. For inexperienced readers, the false-positive rate was 25-41% and 71-200% higher with 3D filet with CAD compared with 3D filet and 2D, respectively. JAFROC-1 analysis showed no significant differences in per-lesion overall performance among reading modes (p = 0.8). Conclusion: CAD applied as a second reader using 3D filet increased both sensitivity and the number of false positives by inexperienced readers compared with 3D filet and 2D, thus not improving overall performance, i.e., the ability to distinguish between lesions and non-lesions.

  17. Automated a complex computer aided design concept generated using macros programming

    International Nuclear Information System (INIS)

    Changing a complex Computer Aided design profile such as car and aircraft surfaces has always been difficult and challenging. The capability of CAD software such as AutoCAD and CATIA show that a simple configuration of a CAD design can be easily modified without hassle, but it is not the case with complex design configuration. Design changes help users to test and explore various configurations of the design concept before the production of a model. The purpose of this study is to look into macros programming as parametric method of the commercial aircraft design. Macros programming is a method where the configurations of the design are done by recording a script of commands, editing the data value and adding a certain new command line to create an element of parametric design. The steps and the procedure to create a macro programming are discussed, besides looking into some difficulties during the process of creation and advantage of its usage. Generally, the advantages of macros programming as a method of parametric design are; allowing flexibility for design exploration, increasing the usability of the design solution, allowing proper contained by the model while restricting others and real time feedback changes

  18. Automated a complex computer aided design concept generated using macros programming

    Science.gov (United States)

    Rizal Ramly, Mohammad; Asrokin, Azharrudin; Abd Rahman, Safura; Zulkifly, Nurul Ain Md

    2013-12-01

    Changing a complex Computer Aided design profile such as car and aircraft surfaces has always been difficult and challenging. The capability of CAD software such as AutoCAD and CATIA show that a simple configuration of a CAD design can be easily modified without hassle, but it is not the case with complex design configuration. Design changes help users to test and explore various configurations of the design concept before the production of a model. The purpose of this study is to look into macros programming as parametric method of the commercial aircraft design. Macros programming is a method where the configurations of the design are done by recording a script of commands, editing the data value and adding a certain new command line to create an element of parametric design. The steps and the procedure to create a macro programming are discussed, besides looking into some difficulties during the process of creation and advantage of its usage. Generally, the advantages of macros programming as a method of parametric design are; allowing flexibility for design exploration, increasing the usability of the design solution, allowing proper contained by the model while restricting others and real time feedback changes.

  19. Promoting best practice design intent in 3D CAD for engineers through a task analysis

    Directory of Open Access Journals (Sweden)

    Keelin Leahy

    2013-01-01

    Full Text Available Assessment encompasses a range of methods and techniques. At the University of Limerick, Ireland, it is an affirmed obligation to facilitate timely and useful feedback for both formative (for learning and summative (of learning assessment. However, the effectiveness of this feedback has raised concern and has a wide-ranging review of research findings. This paper presents research findings to build a picture of the extent to which the impact of feedback as a constructivist paradigm of teaching and learning can promote best practice design intent in 3D CAD Modelling. The resulting data set, comprised of 114 higher education students, is used to discuss the impact of assessment and feedback, comparing semesters Spring 2011/12 and Spring 2012/13. The 2012/13 cohort received formative assessment feedback from a task analysis. This evidenced an upsurge in understanding in best practice design intent in 3D CAD parametric modelling, supported by an effect size of 0.534.

  20. Immersive CAD

    Energy Technology Data Exchange (ETDEWEB)

    Ames, A.L.

    1999-02-01

    This paper documents development of a capability for performing shape-changing editing operations on solid model representations in an immersive environment. The capability includes part- and assembly-level operations, with part modeling supporting topology-invariant and topology-changing modifications. A discussion of various design considerations in developing an immersive capability is included, along with discussion of a prototype implementation we have developed and explored. The project investigated approaches to providing both topology-invariant and topology-changing editing. A prototype environment was developed to test the approaches and determine the usefulness of immersive editing. The prototype showed exciting potential in redefining the CAD interface. It is fun to use. Editing is much faster and friendlier than traditional feature-based CAD software. The prototype algorithms did not reliably provide a sufficient frame rate for complex geometries, but has provided the necessary roadmap for development of a production capability.

  1. PopupCAD: a tool for automated design, fabrication, and analysis of laminate devices

    Science.gov (United States)

    Aukes, Daniel M.; Wood, Robert J.

    2015-05-01

    Recent advances in laminate manufacturing techniques have driven the development of new classes of millimeter-scale sensorized medical devices, robots capable of terrestrial locomotion and sustained flight, and new techniques for sensing and actuation. Recently, the analysis of laminate micro-devices has focused more manufacturability concerns and not on mechanics. Considering the nature of such devices, we draw from existing research in composites, origami kinematics, and finite element methods in order to identify issues related to sequential assembly and self-folding prior to fabrication as well as the stiffness of composite folded systems during operation. These techniques can be useful for understanding how such devices will bend and flex under normal operating conditions, and when added to new design tools like popupCAD, will give designers another means to develop better devices throughout the design process.

  2. Computer Aided Control System Design (CACSD)

    Science.gov (United States)

    Stoner, Frank T.

    1993-01-01

    The design of modern aerospace systems relies on the efficient utilization of computational resources and the availability of computational tools to provide accurate system modeling. This research focuses on the development of a computer aided control system design application which provides a full range of stability analysis and control design capabilities for aerospace vehicles.

  3. Selecting a CAD/CAM system for the first time

    Energy Technology Data Exchange (ETDEWEB)

    Link, C.H.

    1984-01-01

    A good percentage of manufacturing companies with gross sales exceeding $100 million already use some form of computer-aided design and manufacturing (CAD/CAM). More recently, however, a new, larger group with annual gross sales between $10 million and $100 million have entered the CAD/CAM marketplace. Interested because the technology has proven itself to be economical, beneficial, and relatively easy to implement without prior computer experience, these companies are actively investigating and applying CAD and CAD/CAM. Many are subcontractors to large companies with low design requirements. Others may design and/or manufacture a proprietary product line. Yet, while resembling one another, the needs of these companies vary widely. Applying the proper kind and level of CAD/CAM, therefore, requires a careful analysis of each user's needs.

  4. CAD/CAM at Gullick Dobson Ltd

    Energy Technology Data Exchange (ETDEWEB)

    1985-11-01

    Gullick Dobson introduced computer-aided design systems more than four years ago, and those have improved the standard of technical presentation for tendering as well as saving time and the repetitive mundane work involved in incorporating standard plants onto several drawings. Computer-aided manufacture has also helped to reduce costs and in future interactive CAD/CAM will be developed where total engineering will result in the best product.

  5. Schools (Students) Exchanging CAD/CAM Files over the Internet.

    Science.gov (United States)

    Mahoney, Gary S.; Smallwood, James E.

    This document discusses how students and schools can benefit from exchanging computer-aided design/computer-aided manufacturing (CAD/CAM) files over the Internet, explains how files are exchanged, and examines the problem of selected hardware/software incompatibility. Key terms associated with information search services are defined, and several…

  6. Advanced 3D-CAD Design Methods in Education and Research

    Directory of Open Access Journals (Sweden)

    Patrick Rossbacher

    2009-12-01

    Full Text Available The integration of advanced virtual engineering methods into 3D-CAD based development processes leads to increased requirements, concerning the software packages as well as regarding the applied procedures and strategies. Modern IT- based engineering tools offer much more than the conventional development methodologies in component creation and digital mock-up processes. The trend definitely goes into the direction of simultaneous CAE - support during the layout and design phases, attendant quality and structural management and the implementation of external data sources and receivers into the product development. It is up to the engineers to tap the full potential of virtual engineering processes regarding time reduction, error prevention in early phases and through technical modifications, whereas the applied methods and strategies represent a key factor on the way to efficient progresses. The present publication includes an assessment and evaluation of modern 3D-CAD based development processes and discusses future prospects in the field of virtual engineering. On the basis of parametric geometry generation, different methods and tools, which are able to increase the efficiency in virtual development processes, will be introduced and compared.

  7. CAD System for Aircraft Structure Static Test Design%飞机结构静力试验 CAD 系统

    Institute of Scientific and Technical Information of China (English)

    侯同济; 张建锋; 滕申科

    2013-01-01

      飞机结构静力试验设计系统(Aircraft Structure Static Test Design System-ASSTDS)是用于全尺寸飞机结构静力试验设计的、图形交互式的计算机辅助设计(CAD)软件系统。本文介绍了基于面向对象技术完成的软件系统需求分析、功能分解和对象抽象,软件开发过程中建立的系统对象体系以及主要对象和它们之间的相互关系。飞机结构静力试验设计系统采用 VC++编程语言在 Windows 操作系统上开发完成的。%The ASSTDS system is a special graphical interactive CAD software for the aircraft structure static test design. The paper introduces the requesting analysis, function decomposing and object abstracting for the sofeware based on object-oriented technology and the object architecture in the software development. The main objects and their relationships are also described. ASSTDS is developed in the programming language VC++ on the Windows operation system.

  8. Next-generation CAE/CAD/CAM system, CADDS5, featuring configurable design technology and intelligent user interfaces. Shinsedai CAE/CAD/CAM system CADDS5

    Energy Technology Data Exchange (ETDEWEB)

    Mizobe, K.; Suzuki, K.; Shimada, K. (Toshiba Corp., Tokyo (Japan))

    1992-12-01

    The next-generation CAE/CAD/CAM system (CADDS5) is outlined. It is featured by feature-based modeling capability which is possible to generate not only solid models of objects but also advanced models enhanced by material, finishing and machining information. Its software system is composed of (1) the main software package including a variational sketcher function, parametric solid one, feature-based modeling one and equation solver, (2) the software group for downsizing of software, and (3) the object-oriented programming tool to generate customized functions. In addition, CADDS5 provides some application software tools, (1) the plant piping design support tool including procedures from a piping layout to a cost estimation, (2) the structure design support tool for plants and buildings, and (3) the civil engineering design support tool to generate three-dimensional terrain models from terrain or surveying data. 2 refs., 2 figs.

  9. CAD-CAM at Bendix Kansas city: the BICAM system

    Energy Technology Data Exchange (ETDEWEB)

    Witte, D.R.

    1983-04-01

    Bendix Kansas City Division (BEKC) has been involved in Computer Aided Manufacturing (CAM) technology since the late 1950's when the numerical control (N/C) analysts installed computers to aid in N/C tape preparation for numerically controlled machines. Computer Aided Design (CAD) technology was introduced in 1976, when a number of 2D turnkey drafting stations were procured for printed wiring board (PWB) drawing definition and maintenance. In June, 1980, CAD-CAM Operations was formed to incorporate an integrated CAD-CAM capability into Bendix operations. In March 1982, a ninth division was added to the existing eight divisions at Bendix. Computer Integrated Manufacturing (CIM) is a small organization, reporting directly to the general manager, who has responsibility to coordinate the overall integration of computer aided systems at Bendix. As a long range plan, CIM has adopted a National Bureau of Standards (NBS) architecture titled Factory of the Future. Conceptually, the Bendix CAD-CAM system has a centrally located data base which can be accessed by both CAD and CAM tools, processes, and personnel thus forming an integrated Computer Aided Engineering (CAE) System. This is a key requirement of the Bendix CAD-CAM system that will be presented in more detail.

  10. The Importance of CAD and Knowledge Management in Concurrent Engineering Project Performance

    OpenAIRE

    Poh Kiat Ng; Gerald Guan Gan Goh; Uchenna Cyril Eze

    2011-01-01

    As a complex method for manufacturing and development, concurrent engineering has been studied and implemented extensively in the manufacturing industry to speed up production schedules and to reduce costs. One of the tools used in concurrent engineering is computer-aided design or CAD in short. CAD applications in multifunctional knowledge distribution refer to the use of CAD to provide information to different groups of employees in their organisation to sustain new product development acti...

  11. DeviceEditor visual biological CAD canvas

    Directory of Open Access Journals (Sweden)

    Chen Joanna

    2012-02-01

    Full Text Available Abstract Background Biological Computer Aided Design (bioCAD assists the de novo design and selection of existing genetic components to achieve a desired biological activity, as part of an integrated design-build-test cycle. To meet the emerging needs of Synthetic Biology, bioCAD tools must address the increasing prevalence of combinatorial library design, design rule specification, and scar-less multi-part DNA assembly. Results We report the development and deployment of web-based bioCAD software, DeviceEditor, which provides a graphical design environment that mimics the intuitive visual whiteboard design process practiced in biological laboratories. The key innovations of DeviceEditor include visual combinatorial library design, direct integration with scar-less multi-part DNA assembly design automation, and a graphical user interface for the creation and modification of design specification rules. We demonstrate how biological designs are rendered on the DeviceEditor canvas, and we present effective visualizations of genetic component ordering and combinatorial variations within complex designs. Conclusions DeviceEditor liberates researchers from DNA base-pair manipulation, and enables users to create successful prototypes using standardized, functional, and visual abstractions. Open and documented software interfaces support further integration of DeviceEditor with other bioCAD tools and software platforms. DeviceEditor saves researcher time and institutional resources through correct-by-construction design, the automation of tedious tasks, design reuse, and the minimization of DNA assembly costs.

  12. Quantitative Evaluation of Tissue Surface Adaption of CAD-Designed and 3D Printed Wax Pattern of Maxillary Complete Denture

    Directory of Open Access Journals (Sweden)

    Hu Chen

    2015-01-01

    Full Text Available Objective. To quantitatively evaluate the tissue surface adaption of a maxillary complete denture wax pattern produced by CAD and 3DP. Methods. A standard edentulous maxilla plaster cast model was used, for which a wax pattern of complete denture was designed using CAD software developed in our previous study and printed using a 3D wax printer, while another wax pattern was manufactured by the traditional manual method. The cast model and the two wax patterns were scanned in the 3D scanner as “DataModel,” “DataWaxRP,” and “DataWaxManual.” After setting each wax pattern on the plaster cast, the whole model was scanned for registration. After registration, the deviations of tissue surface between “DataModel” and “DataWaxRP” and between “DataModel” and “DataWaxManual” were measured. The data was analyzed by paired t-test. Results. For both wax patterns produced by the CAD&RP method and the manual method, scanning data of tissue surface and cast surface showed a good fit in the majority. No statistically significant (P>0.05 difference was observed between the CAD&RP method and the manual method. Conclusions. Wax pattern of maxillary complete denture produced by the CAD&3DP method is comparable with traditional manual method in the adaption to the edentulous cast model.

  13. AutoCAD aplicado a la Topografía

    OpenAIRE

    Mora Navarro, Joaquin Gaspar; Femenia Ribera, Carmen

    2008-01-01

    The most common tasks for Topography professionals consist of doing land surveys, making digital models of the terrain, longitudinal profiles, cross sections, volume calculation and on-site layouts. At this time, it is necessary to use computer aided design (CAD) programs to create and lay out final maps, and one of the most common programs is AutoCAD. This graphic editor makes it possible to precisely solve the most common topography tasks quickly and with good quality: g...

  14. Computer-aided design of a coffee-dragging device

    Directory of Open Access Journals (Sweden)

    Marcus Vinicuis Morais de Oliveira

    2014-10-01

    Full Text Available Dragging is the most costly and time-consuming stage of the coffee harvest. Therefore, its mechanization is important. The objectives of this study were to design, build, and evaluate the dynamics of a coffee-dragging device in a laboratory setting. The prototype consists of a dragging device with rods mounted on a metal plate and a chassis. Computer-aided design (CAD software was used to generate a solid second-order tetrahedral mesh for use in finite element analyses of the device and its parts. It was possible to simulate and display the device’s errors and failures and generate data on part deformities, Von Mises tension, and equivalent efforts. Equations based on the Denavit–Hartenberg theory were developed to describe the dragging device kinematics, and the results obtained with these equations were compared to those for the design developed using the software program. A preliminary drawing analysis identified a lever-type system as the best configuration for the device, based on its simple construction and its ability to balance the weight of the project parts. The safety factor achieved was greater than 28. Adjustment of the vibration amplitude of the rods is possible using the eccentric shaft of the connecting rod drive. Finite element analyses was used to analyze the connecting rod and predict the likely failure points.

  15. Computer-Aided Design Method of Warp-Knitted Jacquard Spacer Fabrics

    Directory of Open Access Journals (Sweden)

    Li Xinxin

    2016-06-01

    Full Text Available Based on a further study on knitting and jacquard principles, this paper presents a mathematical design model to make computer-aided design of warp-knitted jacquard spacer fabrics more efficient. The mathematical model with matrix method employs three essential elements of chain notation, threading and Jacquard designing. With this model, the processing to design warp-knitted jacquard spacer fabrics with CAD software is also introduced. In this study, the sports shoes which have separated functional areas according to the feet structure and characteristics of movement are analysed. The results show the different patterns on Jacquard spacer fabrics that are seamlessly stitched with jacquard technics. The computer-aided design method of warp-knitted jacquard spacer fabrics is efficient and simple.

  16. Teaching Computer Aided Architectural Design at UCLA.

    Science.gov (United States)

    Mitchell, William J.

    This brief overview includes a rationale for the program and describes course goals and objectives, curriculum content, teaching methods and materials, staffing, and problems of integrating computer aided design with traditional architectural curricula at the School of Architecture and Urban Planning at UCLA. A list of texts for use in teaching…

  17. Engineering specification and system design for CAD/CAM of custom shoes: UMC project effort

    Science.gov (United States)

    Bao, Han P.

    1991-01-01

    The goal of this project is to supplement the footwear design system of North Carolina State University (NCSU) with a software module to design and manufacture a combination sole. The four areas of concentration were: customization of NASCAD (NASA Computer Aided Design) to the footwear project; use of CENCIT data; computer aided manufacturing activities; and beginning work for the bottom elements of shoes. The task of generating a software module for producing a sole was completed with a demonstrated product realization. The software written in C was delivered to NCSU for inclusion in their design system for custom footwear known as LASTMOD. The machining process of the shoe last was improved using a spiral tool path approach.

  18. Numerical Simulation of the Francis Turbine and CAD used to Optimized the Runner Design (2nd).

    Science.gov (United States)

    Sutikno, Priyono

    2010-06-01

    Hydro Power is the most important renewable energy source on earth. The water is free of charge and with the generation of electric energy in a Hydroelectric Power station the production of green house gases (mainly CO2) is negligible. Hydro Power Generation Stations are long term installations and can be used for 50 years and more, care must be taken to guarantee a smooth and safe operation over the years. Maintenance is necessary and critical parts of the machines have to be replaced if necessary. Within modern engineering the numerical flow simulation plays an important role in order to optimize the hydraulic turbine in conjunction with connected components of the plant. Especially for rehabilitation and upgrading existing Power Plants important point of concern are to predict the power output of turbine, to achieve maximum hydraulic efficiency, to avoid or to minimize cavitations, to avoid or to minimized vibrations in whole range operation. Flow simulation can help to solve operational problems and to optimize the turbo machinery for hydro electric generating stations or their component through, intuitive optimization, mathematical optimization, parametric design, the reduction of cavitations through design, prediction of draft tube vortex, trouble shooting by using the simulation. The classic design through graphic-analytical method is cumbersome and can't give in evidence the positive or negative aspects of the designing options. So it was obvious to have imposed as necessity the classical design methods to an adequate design method using the CAD software. There are many option chose during design calculus in a specific step of designing may be verified in ensemble and detail form a point of view. The final graphic post processing would be realized only for the optimal solution, through a 3 D representation of the runner as a whole for the final approval geometric shape. In this article it was investigated the redesign of the hydraulic turbine's runner

  19. Absorbing CAD system geometries into GEANT

    International Nuclear Information System (INIS)

    The simulation community has for many years discussed the possibility of direct conversion of geometrical detector models from computer- aided design and engineering systems (CAD systems) to the simulation packages (which we shall assume means GEANT). This would allow fast and simultaneous optimization of the physics performance and structural integrity of detector designs. The benefit that this would offer is the avoidance of such problems as the late discovery of the rather thick cryostats in the D-Zero detector. Recent progress in the absorption of CAD geometries into GEANT models is reviewed, including descriptions of the additions to the I-DEAS solid modeller package developed for the EMPACT SSC proposal, the COGENT CAD-to-GEANT interpreter developed by Quantum Research Services, and the OCTAGON package for representing arbitrary shapes in GEANT. Likely future directions of development are described. 2 refs., 7 figs

  20. 基于辅助线滞生法的Auto CAD R12参数化设计系统%Auto CAD R12 Parametric Design System Based on the Detained Auxiliary Line

    Institute of Scientific and Technical Information of China (English)

    郭启全; 周克绳

    1996-01-01

    本文提出了一种在Auto CAD R12环境下,用C语言(基于ADS)开发二维图形参数化设计的新方法辅助线滞生法.解决了辅助线滞生法与ADS具体结合中的技术难题;阐述了实元素悬挂到辅助元素上的新思想,实现了尺寸驱动;为用户众多的Auto CAD R12增加了新功能.基于该方法的Auto CAD R12参数化设计系统(Auto CAD R12 Parametric Design System--APDS)已用于悬挂输送机、管道油阀及半挂自卸车的设计绘图.

  1. Resin-composite blocks for dental CAD/CAM applications.

    Science.gov (United States)

    Ruse, N D; Sadoun, M J

    2014-12-01

    Advances in digital impression technology and manufacturing processes have led to a dramatic paradigm shift in dentistry and to the widespread use of computer-aided design/computer-aided manufacturing (CAD/CAM) in the fabrication of indirect dental restorations. Research and development in materials suitable for CAD/CAM applications are currently the most active field in dental materials. Two classes of materials are used in the production of CAD/CAM restorations: glass-ceramics/ceramics and resin composites. While glass-ceramics/ceramics have overall superior mechanical and esthetic properties, resin-composite materials may offer significant advantages related to their machinability and intra-oral reparability. This review summarizes recent developments in resin-composite materials for CAD/CAM applications, focusing on both commercial and experimental materials.

  2. Resin-composite Blocks for Dental CAD/CAM Applications

    Science.gov (United States)

    Ruse, N.D.; Sadoun, M.J.

    2014-01-01

    Advances in digital impression technology and manufacturing processes have led to a dramatic paradigm shift in dentistry and to the widespread use of computer-aided design/computer-aided manufacturing (CAD/CAM) in the fabrication of indirect dental restorations. Research and development in materials suitable for CAD/CAM applications are currently the most active field in dental materials. Two classes of materials are used in the production of CAD/CAM restorations: glass-ceramics/ceramics and resin composites. While glass-ceramics/ceramics have overall superior mechanical and esthetic properties, resin-composite materials may offer significant advantages related to their machinability and intra-oral reparability. This review summarizes recent developments in resin-composite materials for CAD/CAM applications, focusing on both commercial and experimental materials. PMID:25344335

  3. Design and RF test of MEBT buncher cavities for C-ADS Injector II at IMP

    Energy Technology Data Exchange (ETDEWEB)

    Huang, Shichun; Jia, Huan [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); University of Chinese Academy of Sciences, Beijing 100049 (China); Niu, Haihua [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); He, Yuan, E-mail: hey@impcas.ac.cn [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); Zhang, Shenghu; Yuan, Chenzhang [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); Wang, Jing [Lanzhou University of Technology, Lanzhou 730050 (China); Zhang, Shengxue; Chang, Wei; Zhang, Peng; Zhao, Hongwei; Xia, Jiawen [Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China)

    2015-11-01

    Abstracts: To match the beam from the Radio Frequency Quadrupole (RFQ) accelerator to the Superconducting Half-wave Resonator (HWR) Linac, two room temperature (RT) double-gap Quarter-wave Resonator (QWR) bunchers are designed to be located in the Medium Energy Beam Transport Line (MEBT) for the C-ADS Injector II at IMP. Both cavities work at 162.5 MHz, with β=0.067 and a beam aperture diameter of 40 mm. The effective voltage of these two cavities needs to reach 135 kV in Continuous Wave (CW) mode. In this paper, the RF design and thermal analysis of the cavities will be presented, along with the tuners and coupler consideration. The measured frequencies, R{sub sh}/Q{sub 0}, Q{sub 0} and voltage of the cavities agree well with the simulation result. Details of the RF test results including the full power tests of the cavities will be shown. - Highlights: • High bunching voltage for this type of cavity with limited longitudinal length in MEBT line. • Using copper-plated stainless technique for cavity outer conductor. • Spiral cooling channel design for stem cooling.

  4. Computers in engineering 1983; Proceedings of the International Conference and Exhibit, Chicago, IL, August 7-11, 1983. Volume 1 - Computer-aided design, manufacturing, and simulation

    Science.gov (United States)

    Cokonis, T. J.

    The papers presented in this volume provide examples of the impact of computers on present engineering practice and indicate some future trends in computer-aided design, manufacturing, and simulation. Topics discussed include computer-aided design of turbine cycle configuration, managing and development of engineering computer systems, computer-aided manufacturing with robots in the automotive industry, and computer-aided design/analysis techniques of composite materials in the cure phase. Papers are also presented on computer simulation of vehicular propulsion systems, the performance of a hydraulic system simulator in a CAD environment, and computer simulation of hovercraft heave dynamics and control.

  5. CAD/CAM-assisted breast reconstruction

    Energy Technology Data Exchange (ETDEWEB)

    Melchels, Ferry; Hutmacher, Dietmar Werner [Institute of Health and Biomedical Innovation, Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, QLD 4059 (Australia); Wiggenhauser, Paul Severin; Schantz, Jan-Thorsten [Department of Plastic and Hand Surgery, Klinikum rechts der Isar, Technische Universitaet Muenchen, Ismaninger Strasse 22, 81675 Munich (Germany); Warne, David; Barry, Mark [High Performance Computing and Research Support, Queensland University of Technology, Gardens Point Road, Brisbane, QLD 4000 (Australia); Ong, Fook Rhu; Chong, Woon Shin, E-mail: Dietmar.Hutmacher@qut.edu.au, E-mail: jtschantz@lrz.tu-muenchen.de [Singapore Polytechnic, 500 Dover Road, 139651 Singapore (Singapore)

    2011-09-15

    The application of computer-aided design and manufacturing (CAD/CAM) techniques in the clinic is growing slowly but steadily. The ability to build patient-specific models based on medical imaging data offers major potential. In this work we report on the feasibility of employing laser scanning with CAD/CAM techniques to aid in breast reconstruction. A patient was imaged with laser scanning, an economical and facile method for creating an accurate digital representation of the breasts and surrounding tissues. The obtained model was used to fabricate a customized mould that was employed as an intra-operative aid for the surgeon performing autologous tissue reconstruction of the breast removed due to cancer. Furthermore, a solid breast model was derived from the imaged data and digitally processed for the fabrication of customized scaffolds for breast tissue engineering. To this end, a novel generic algorithm for creating porosity within a solid model was developed, using a finite element model as intermediate.

  6. CAD/CAM-assisted breast reconstruction

    International Nuclear Information System (INIS)

    The application of computer-aided design and manufacturing (CAD/CAM) techniques in the clinic is growing slowly but steadily. The ability to build patient-specific models based on medical imaging data offers major potential. In this work we report on the feasibility of employing laser scanning with CAD/CAM techniques to aid in breast reconstruction. A patient was imaged with laser scanning, an economical and facile method for creating an accurate digital representation of the breasts and surrounding tissues. The obtained model was used to fabricate a customized mould that was employed as an intra-operative aid for the surgeon performing autologous tissue reconstruction of the breast removed due to cancer. Furthermore, a solid breast model was derived from the imaged data and digitally processed for the fabrication of customized scaffolds for breast tissue engineering. To this end, a novel generic algorithm for creating porosity within a solid model was developed, using a finite element model as intermediate.

  7. Introduction to AutoCAD 2013 2D and 3D design

    CERN Document Server

    Yarwood, Alf

    2013-01-01

    Master the complexities of the world's bestselling 2D and 3D software with Alf Yarwood's Introduction to AutoCAD 2013. Ideally suited to new users of AutoCAD, this book will be a useful resource for drawing modules in both vocational and introductory undergraduate courses in engineering and construction.Alf Yarwood has once again produced a comprehensive, step-by-step introduction to the latest release of AutoCAD. Covering all the basic principles and acting as an introduction to 2D drawing, it also contains extensive coverage of all 3D topics, including 3D solid modelling a

  8. Custom-Made Computer-Aided-Design/Computer-Aided-Manufacturing Biphasic Calcium-Phosphate Scaffold for Augmentation of an Atrophic Mandibular Anterior Ridge

    Directory of Open Access Journals (Sweden)

    Francesco Guido Mangano

    2015-01-01

    Full Text Available This report documents the clinical, radiographic, and histologic outcome of a custom-made computer-aided-design/computer-aided-manufactured (CAD/CAM scaffold used for the alveolar ridge augmentation of a severely atrophic anterior mandible. Computed tomographic (CT images of an atrophic anterior mandible were acquired and modified into a 3-dimensional (3D reconstruction model; this was transferred to a CAD program, where a custom-made scaffold was designed. CAM software generated a set of tool-paths for the manufacture of the scaffold on a computer-numerical-control milling machine into the exact shape of the 3D design. A custom-made scaffold was milled from a synthetic micromacroporous biphasic calcium phosphate (BCP block. The scaffold closely matched the shape of the defect: this helped to reduce the time for the surgery and contributed to good healing. One year later, newly formed and well-integrated bone was clinically available, and two implants (AnyRidge, MegaGen, Gyeongbuk, South Korea were placed. The histologic samples retrieved from the implant sites revealed compact mature bone undergoing remodelling, marrow spaces, and newly formed trabecular bone surrounded by residual BCP particles. This study demonstrates that custom-made scaffolds can be fabricated by combining CT scans and CAD/CAM techniques. Further studies on a larger sample of patients are needed to confirm these results.

  9. CAD of waveguide array antennas based on "filter" concepts

    NARCIS (Netherlands)

    Visser, H.J.; Guglielmi, M.

    1999-01-01

    In this paper an alternative approach for the design of open-ended waveguide array antennas is presented. The approach is based on microwave filter concepts. The exploitation of this alternative viewpoint has been made possible by the availability of a very efficient computer-aided design (CAD) tool

  10. Harmonizing interoperability - Emergent Serious Gaming in Playful Stochastic CAD Environments

    NARCIS (Netherlands)

    Kosmadoudi, Z.; Lim, T.; Ritchie, J.M.; Liu, Y.; Sung, R.; Hauge, J.B.; Garbaya, S.; Wendrich, R.E.; Stanescu, I.A.; De Gloria, Alessandro

    2014-01-01

    Computer-Aided Design (CAD) applications often promote memorable experiences for the wrong reasons. Coupled with complex functionality and poor user experience the learning curve is often steep and overwhelming. Invoking design creativity remains limited to conveying established geometry. Gameplay c

  11. Conflict Resolution in Distributed CAD Cooperative Design%分布式CAD协同设计中的冲突消解

    Institute of Scientific and Technical Information of China (English)

    孙欢; 刘强

    2006-01-01

    本文提出了一个分布式三维CAD(Computer Aided Design)协同设计环境中进行冲突避免、检测和解决的模型DCCM(Distributed Cooperation Conflicts Model).DCCM将具有语义的CAD命令分为两类,混合使用操作序列化和半乐观锁机制进行并发控制;提供协同感知机制避免协作冲突;采用两级冲突解决模式,基于命令的语义进行冲突检测,提供仲裁者机制协商解决冲突.

  12. An Aided Tool for Enterprise Network Design

    Institute of Scientific and Technical Information of China (English)

    冯径; 马小骏; 顾伯萱; 顾冠群

    2000-01-01

    With the rapid development of network technologies, it is necessary to make use of an aided tool (AT) to help enterprise network design (END). The AT must process many requirements qualitatively and quantitatively, and then give out the logical network guidance and preferred solution. The AT also needs to carry out a simulation program, and gives the feasibility report. This paper will introduce the authors' research work on above aspects.

  13. Computer-aided design of conveyor belts

    Energy Technology Data Exchange (ETDEWEB)

    Karolewski, B.; Pytel, J.

    1984-01-01

    Possibilities are discussed for using mathematical models of belt conveyors for development of computer-aided design of conveyors for coal mining. Examples of optimization tasks and methods for their solution using computerized simulation are analyzed. The analysis is illustrated by an algorithm used to design a starter for the drive system of a belt conveyor. Electromagnetic moment and starting current are used as optimization criteria. A simplified model of a belt conveyor is used. The model consists of an equation of motion with variable braking moment and variable moment of inertia. 3 references.

  14. Computer-Aided Design of Antimicrobial Peptides

    DEFF Research Database (Denmark)

    Fjell, Christopher D.; Hancock, Robert E.W.; Jenssen, Håvard

    2010-01-01

    chemical parameters with biological activities of the peptide, using statistical methods. In this review we will discuss two different in silico strategies of computer-aided antibacterial peptide design, a linear correlation model build as an extension of traditional principal component analysis (PCA......) and a non-linear artificial neural network model. Studies on structurally diverse peptides, have concluded that the PCA derived model are able to guide the antibacterial peptide design in a meaningful way, however requiring rather a high homology between the peptides in the test-set and the in silico...

  15. Computer-Aided Design (CAD) Tools to Support the Human Factors Design Teams

    Science.gov (United States)

    Null, Cynthia H.; Jackson, Mariea D.; Perry, Trey; Quick, Jason C.; Stokes, Jack W.

    2014-01-01

    The scope of this assessment was to develop a library of basic 1-Gravity (G) human posture and motion elements used to construct complex virtual simulations of ground processing and maintenance tasks for spaceflight vehicles, including launch vehicles, crewed spacecraft, robotic spacecraft, satellites, and other payloads. The report herein describes the task, its purpose, performance, findings, NASA Engineering and Safety Center (NESC) recommendations, and conclusions in the definition and assemblage of the postures and motions database (PMD).

  16. CAD based design sensitivity analysis and shape optimization of scaffolds for bio-root regeneration in swine.

    Science.gov (United States)

    Luo, Xiangyou; Yang, Bo; Sheng, Lei; Chen, Jinlong; Li, Hui; Xie, Li; Chen, Gang; Yu, Mei; Guo, Weihua; Tian, Weidong

    2015-07-01

    Tooth root supports dental crown and bears occlusal force. While proper root shape and size render the force being evenly delivered and dispersed into jawbone. Yet it remains unclear what shape and size of a biological tooth root (bio-root), which is mostly determined by the scaffold geometric design, is suitable for stress distributing and mastication performing. Therefore, this study hypothesized scaffold fabricated in proper shape and size is better for regeneration of tooth root with approving biomechanical functional features. In this study, we optimized shape and size of scaffolds for bio-root regeneration using computer aided design (CAD) modeling and finite element analysis (FEA). Statical structural analysis showed the total deformation (TD) and equivalent von-mises stress (EQV) of the restored tooth model mainly concentrated on the scaffold and the post, in accordance with the condition in a natural post restored tooth. Design sensitivity analysis showed increasing the height and upper diameter of the scaffold can tremendously reduce the TD and EQV of the model, while increasing the bottom diameter of scaffold can, to some extent, reduce the EQV in post. However, increase on post height had little influence on the whole model, only slightly increased the native EQV stress in post. Through response surface based optimization, we successfully screened out the optimal shape of the scaffold used in tissue engineering of tooth root. The optimal scaffold adopted a slightly tapered shape with the upper diameter of 4.9 mm, bottom diameter of 3.4 mm; the length of the optimized scaffold shape was 9.4 mm. While the analysis also suggested a height of about 9 mm for a metal post with a diameter of 1.4 mm suitable for crown restoration in bio-root regeneration. In order to validate the physiological function of the shape optimized scaffold in vivo, we transplanted the shape optimized treated dentin matrix (TDM) scaffold, seeding with dental stem cells, into alveolar

  17. COMPUTER AIDED THREE DIMENSIONAL DESIGN OF MOLD COMPONENTS

    Directory of Open Access Journals (Sweden)

    Kerim ÇETİNKAYA

    2000-02-01

    Full Text Available Sheet metal molding design with classical methods is formed in very long times calculates and drafts. At the molding design, selection and drafting of most of the components requires very long time because of similar repetative processes. In this study, a molding design program has been developed by using AutoLISP which has been adapted AutoCAD packet program. With this study, design of sheet metal molding, dimensioning, assemly drafting has been realized.

  18. Domain specific software design for decision aiding

    Science.gov (United States)

    Keller, Kirby; Stanley, Kevin

    1992-01-01

    McDonnell Aircraft Company (MCAIR) is involved in many large multi-discipline design and development efforts of tactical aircraft. These involve a number of design disciplines that must be coordinated to produce an integrated design and a successful product. Our interpretation of a domain specific software design (DSSD) is that of a representation or framework that is specialized to support a limited problem domain. A DSSD is an abstract software design that is shaped by the problem characteristics. This parallels the theme of object-oriented analysis and design of letting the problem model directly drive the design. The DSSD concept extends the notion of software reusability to include representations or frameworks. It supports the entire software life cycle and specifically leads to improved prototyping capability, supports system integration, and promotes reuse of software designs and supporting frameworks. The example presented in this paper is the task network architecture or design which was developed for the MCAIR Pilot's Associate program. The task network concept supported both module development and system integration within the domain of operator decision aiding. It is presented as an instance where a software design exhibited many of the attributes associated with DSSD concept.

  19. Recent Developments in CAD/analysis Integration

    OpenAIRE

    Lian, H.; Bordas, S. P. A.; Sevilla, R.; Simpson, R.N.

    2012-01-01

    For linear elastic problems, it is well-known that mesh generation dominates the total analysis time. Different types of methods have been proposed to directly or indirectly alleviate this burden associated with mesh generation. We review in this paper a subset of such methods centred on tighter coupling between computer aided design (CAD) and analysis (finite element or boundary element methods). We focus specifically on frameworks which rely on constructing a discretisation directly from th...

  20. Integrating Real-Time Room Acoustics Simulation into a CAD Modeling Software to Enhance the Architectural Design Process

    OpenAIRE

    Sönke Pelzer; Lukas Aspöck; Dirk Schröder; Michael Vorländer

    2014-01-01

    For architects, real-time 3D visual rendering of CAD-models is a valuable tool. The architect usually perceives the visual appearance of the building interior in a natural and realistic way during the design process. Unfortunately this only emphasizes the role of the visual appearance of a building, while the acoustics often remain disregarded. Controlling the room acoustics is not integrated into most architects’ workflows—due to a lack of tools. The present contribution describes a newly de...

  1. An accelerated technique for a ceramic-pressed-to-metal restoration with CAD/CAM technology.

    Science.gov (United States)

    Lee, Ju-Hyoung

    2014-11-01

    The conventional fabrication of metal ceramic restorations depends on an experienced dental technician and requires a long processing time. However, complete-contour digital waxing and digital cutback with computer-aided design and computer-aided manufacturing (CAD/CAM) technology can overcome these disadvantages and provide a correct metal framework design and space for the ceramic material. PMID:24952883

  2. Using CAD software to simulate PV energy yield - The case of product integrated photovoltaic operated under indoor solar irradiation

    NARCIS (Netherlands)

    Reich, N.H.; van Sark, W.G.J.H.M.; Turkenburg, W.C.; Sinke, W.C.

    2010-01-01

    In this paper, we show that photovoltaic (PV) energy yields can be simulated using standard rendering and ray-tracing features of Computer Aided Design (CAD) software. To this end, three-dimensional (3-D) sceneries are ray-traced in CAD. The PV power output is then modeled by translating irradiance

  3. Comparative fracture strength analysis of Lava and Digident CAD/CAM zirconia ceramic crowns

    OpenAIRE

    Kwon, Taek-Ka; Pak, Hyun-Soon; Yang, Jae-Ho; Han, Jung-Suk; Lee, Jai-Bong; Kim, Sung-Hun; Yeo, In-Sung

    2013-01-01

    PURPOSE All-ceramic crowns are subject to fracture during function. To minimize this common clinical complication, zirconium oxide has been used as the framework for all-ceramic crowns. The aim of this study was to compare the fracture strengths of two computer-aided design/computer-aided manufacturing (CAD/CAM) zirconia crown systems: Lava and Digident. MATERIALS AND METHODS Twenty Lava CAD/CAM zirconia crowns and twenty Digident CAD/CAM zirconia crowns were fabricated. A metal die was also ...

  4. Statistical-techniques-based computer-aided diagnosis (CAD) using texture feature analysis: application in computed tomography (CT) imaging to fatty liver disease

    Energy Technology Data Exchange (ETDEWEB)

    Chung, Woon-Kwan [Chosun University, Gwangju (Korea, Republic of); Park, Hyong-Hu [Bong-Seng Memorial Hospital, Busan (Korea, Republic of); Im, In-Chul; Lee, Jae-Seung [Dong-eui University, Busan (Korea, Republic of); Goo, Eun-Hoe [Cheong-ju University, Cheongju (Korea, Republic of); Dong, Kyung-Rae [Gwangju Health College University, Gwangju (Korea, Republic of); Chosun University, Gwangju (Korea, Republic of)

    2012-09-15

    This paper proposes a computer-aided diagnosis (CAD) system based on texture feature analysis and statistical wavelet transformation technology to diagnose fatty liver disease with computed tomography (CT) imaging. In the target image, a wavelet transformation was performed for each lesion area to set the region of analysis (ROA, window size: 50 x 50 pixels) and define the texture feature of a pixel. Based on the extracted texture feature values, six parameters (average gray level, average contrast, relative smoothness, skewness, uniformity, and entropy) were determined to calculate the recognition rate for a fatty liver. In addition, a multivariate analysis of the variance (MANOVA) method was used to perform a discriminant analysis to verify the significance of the extracted texture feature values and the recognition rate for a fatty liver. According to the results, each texture feature value was significant for a comparison of the recognition rate for a fatty liver (p < 0.05). Furthermore, the F-value, which was used as a scale for the difference in recognition rates, was highest in the average gray level, relatively high in the skewness and the entropy, and relatively low in the uniformity, the relative smoothness and the average contrast. The recognition rate for a fatty liver had the same scale as that for the F-value, showing 100% (average gray level) at the maximum and 80% (average contrast) at the minimum. Therefore, the recognition rate is believed to be a useful clinical value for the automatic detection and computer-aided diagnosis (CAD) using the texture feature value. Nevertheless, further study on various diseases and singular diseases will be needed in the future.

  5. Statistical-techniques-based computer-aided diagnosis (CAD) using texture feature analysis: application in computed tomography (CT) imaging to fatty liver disease

    Science.gov (United States)

    Chung, Woon-Kwan; Park, Hyong-Hu; Im, In-Chul; Lee, Jae-Seung; Goo, Eun-Hoe; Dong, Kyung-Rae

    2012-09-01

    This paper proposes a computer-aided diagnosis (CAD) system based on texture feature analysis and statistical wavelet transformation technology to diagnose fatty liver disease with computed tomography (CT) imaging. In the target image, a wavelet transformation was performed for each lesion area to set the region of analysis (ROA, window size: 50 × 50 pixels) and define the texture feature of a pixel. Based on the extracted texture feature values, six parameters (average gray level, average contrast, relative smoothness, skewness, uniformity, and entropy) were determined to calculate the recognition rate for a fatty liver. In addition, a multivariate analysis of the variance (MANOVA) method was used to perform a discriminant analysis to verify the significance of the extracted texture feature values and the recognition rate for a fatty liver. According to the results, each texture feature value was significant for a comparison of the recognition rate for a fatty liver ( p < 0.05). Furthermore, the F-value, which was used as a scale for the difference in recognition rates, was highest in the average gray level, relatively high in the skewness and the entropy, and relatively low in the uniformity, the relative smoothness and the average contrast. The recognition rate for a fatty liver had the same scale as that for the F-value, showing 100% (average gray level) at the maximum and 80% (average contrast) at the minimum. Therefore, the recognition rate is believed to be a useful clinical value for the automatic detection and computer-aided diagnosis (CAD) using the texture feature value. Nevertheless, further study on various diseases and singular diseases will be needed in the future.

  6. Comments on How to Make Mechanical CAD Drawing Conforming to National Standards

    Institute of Scientific and Technical Information of China (English)

    CongWei; TangYongge; 等

    2002-01-01

    At present many CAD software products did not fully meet the requirements of National Standard 《Technical drafting and Mechanical Drawing》 that greatly affects the quality and speed of engineering design.Taking computer-aided design of typical mechanical parts as an example,this paper proposes an approach to develop corresponding functions in CAD software to enhance the standardization of engineering design.

  7. [Digital smile design and anterior monolithic restorations chair side fabrication with Cerec Cad/Cam system].

    Science.gov (United States)

    Perez-Davidi, M

    2015-10-01

    Digital dentistry and digital smile design are both components of modern dentistry. The combination of the two enables the dentist to simulate the desired outcome, share the mock up with the patient and coordinate his or her expectations with the probable esthetic outcome. In this article a case is presented of anterior restorations performed to improve the smile and esthetics of the patient, combining the digital smile design (by Christian Coachman) and the Avatar Digital smile aide of the Cerec SW4 (sirona Germany) software for designing and the MCxI inlab milling unit for the fabrication. The patients picture was imported into the software and the model of the teeth was super imposed into the 3d picture of the face enabling positioning the incisal edge and midline in the desired place and sharing the virtual demo with the patient. All this procedure was performed after the patient had a mockup session in the mouth done according to the wax up procedure. The mockup can be scanned in the mouth and added as a protocol to the patient's digital models, to be used later in the biogeneric copy option. Using this option the software uses the outline of the mockup as guide lins for the final restoration computerized proposal. It is still an aide tool to be improved and simplified but definitely it is the present and future of chair side prosthodontics.

  8. [Digital smile design and anterior monolithic restorations chair side fabrication with Cerec Cad/Cam system].

    Science.gov (United States)

    Perez-Davidi, M

    2015-10-01

    Digital dentistry and digital smile design are both components of modern dentistry. The combination of the two enables the dentist to simulate the desired outcome, share the mock up with the patient and coordinate his or her expectations with the probable esthetic outcome. In this article a case is presented of anterior restorations performed to improve the smile and esthetics of the patient, combining the digital smile design (by Christian Coachman) and the Avatar Digital smile aide of the Cerec SW4 (sirona Germany) software for designing and the MCxI inlab milling unit for the fabrication. The patients picture was imported into the software and the model of the teeth was super imposed into the 3d picture of the face enabling positioning the incisal edge and midline in the desired place and sharing the virtual demo with the patient. All this procedure was performed after the patient had a mockup session in the mouth done according to the wax up procedure. The mockup can be scanned in the mouth and added as a protocol to the patient's digital models, to be used later in the biogeneric copy option. Using this option the software uses the outline of the mockup as guide lins for the final restoration computerized proposal. It is still an aide tool to be improved and simplified but definitely it is the present and future of chair side prosthodontics. PMID:26727845

  9. Computer Aided Aerodynamic Design of Missile Configuration

    Directory of Open Access Journals (Sweden)

    S. Panneerselvam

    1987-10-01

    Full Text Available Aerodynamic configurations of tactical missiles have to produce the required lateral force with minimum time lag to meet the required manoeuvability and response time. The present design which is mainly based on linearised potential flow involves (a indentification of critical design points, (b design of lifting components and their integration with mutual interference, (c evaluation of aerodynamic characteristics, (d checking its adequacy at otherpoints, (e optimization of parameters and selection of configuration, and (f detailed evaluation including aerodynamic pressure distribution. Iterative design process in involed because of the mutual dependance between aerodynamic charactertistics and the parameters of the configuration. though this design method is based on third level of approximation with respect to real flow, aid of computer is essential for carrying out the iterative design process and also for effective selection of configuration by analysing performance. Futuristic design requirement which demand better accuracy on design and estimation calls for sophisticated super computer based theoretical methods viz. , full Euler solution/Navier-Strokes solutions.

  10. Application of CAD in Hydraulic Circuit Design%CAD在液压回路设计中的应用

    Institute of Scientific and Technical Information of China (English)

    郭平

    2011-01-01

    绘制液压回路图的软件与方法很多,CAD软件是其中的一种.为快速正确地绘制液压回路图,设计出合格的液压系统,熟练地应用计算机绘图CAD软件是十分必要的.本文以一液压基本回路图为例,深入描述了CAD软件在绘制液压回路图时的应用及以利用液压回路的特性,快速绘制液压回路的方法与技巧,大大提高了液压回路的设计效率.%Hydraulic circuit diagram drawing software and many ways, CAD software is one of them. In order to draw hydraulic circuit rapidly and accurately, and to design the qualified hydraulic system diagram, using computer graphics software CAD skillfully is necessary. In this paper, the hydraulic basic circuit diagram, for example, described the blocks application in the hydraulic circuit diagram drawing deeply and also the methods and techniques of CAD drawing by using the characteristics of hydraulic circuit. Then the efficiency of designing hydraulic circuit greatly is increased.

  11. Computer Aided Design in Digital Human Modeling for Human Computer Interaction in Ergonomic Assessment: A Review

    Directory of Open Access Journals (Sweden)

    Suman Mukhopadhyay , Sanjib Kumar Das and Tania Chakraborty

    2012-12-01

    Full Text Available Research in Human-Computer Interaction (HCI hasbeen enormously successful in the area of computeraidedergonomics or human-centric designs. Perfectfit for people has always been a target for productdesign. Designers traditionally used anthropometricdimensions for 3D product design which created a lotof fitting problems when dealing with thecomplexities of the human body shapes. Computeraided design (CAD, also known as Computer aideddesign and drafting (CADD is the computertechnology used for the design processing and designdocumentation. CAD has now been used extensivelyin many applications such as automotive,shipbuilding, aerospace industries, architectural andindustrial designs, prosthetics, computer animationfor special effects in movies, advertising andtechnical manuals. As a technology, digital humanmodeling (DHM has rapidly emerged as atechnology that creates, manipulates and controlhuman representations and human-machine systemsscenes on computers for interactive ergonomic designproblem solving. DHM promises to profoundlychange how products or systems are designed, howergonomics analysis is performed, how disorders andimpairments are assessed and how therapies andsurgeries are conducted. The imperative andemerging need for the DHM appears to be consistentwith the fact that the past decade has witnessedsignificant growth in both the software systemsoffering DHM capabilities as well as the corporateadapting the technology.The authors shall dwell atlength and deliberate on how research in DHM hasfinally brought about an enhanced HCI, in thecontext of computer-aided ergonomics or humancentricdesign and discuss about future trends in thiscontext.

  12. IGIS (Interactive Geologic Interpretation System) computer-aided photogeologic mapping with image processing, graphics and CAD/CAM capabilities

    Energy Technology Data Exchange (ETDEWEB)

    McGuffie, B.A.; Johnson, L.F.; Alley, R.E.; Lang, H.R. (California Institute of Technology, Pasadena (USA))

    1989-10-01

    Advances in computer technology are changing the way geologists integrate and use data. Although many geoscience disciplines are absolutely dependent upon computer processing, photogeological and map interpretation computer procedures are just now being developed. Historically, geologists collected data in the field and mapped manually on a topographic map or aerial photographic base. New software called the interactive Geologic Interpretation System (IGIS) is being developed at the Jet Propulsion Laboratory (JPL) within the National Aeronautics and Space Administration (NASA)-funded Multispectral Analysis of Sedimentary Basins Project. To complement conventional geological mapping techniques, Landsat Thematic Mapper (TM) or other digital remote sensing image data and co-registered digital elevation data are combined using computer imaging, graphics, and CAD/CAM techniques to provide tools for photogeologic interpretation, strike/dip determination, cross section construction, stratigraphic section measurement, topographic slope measurement, terrain profile generation, rotatable 3-D block diagram generation, and seismic analysis.

  13. Computer Graphic Design Using Auto-CAD and Plug Nozzle Research

    Science.gov (United States)

    Rogers, Rayna C.

    2004-01-01

    The purpose of creating computer generated images varies widely. They can be use for computational fluid dynamics (CFD), or as a blueprint for designing parts. The schematic that I will be working on the summer will be used to create nozzles that are a part of a larger system. At this phase in the project, the nozzles needed for the systems have been fabricated. One part of my mission is to create both three dimensional and two dimensional models on Auto-CAD 2002 of the nozzles. The research on plug nozzles will allow me to have a better understanding of how they assist in the thrust need for a missile to take off. NASA and the United States military are working together to develop a new design concept. On most missiles a convergent-divergent nozzle is used to create thrust. However, the two are looking into different concepts for the nozzle. The standard convergent-divergent nozzle forces a mixture of combustible fluids and air through a smaller area in comparison to where the combination was mixed. Once it passes through the smaller area known as A8 it comes out the end of the nozzle which is larger the first or area A9. This creates enough thrust for the mechanism whether it is an F-18 fighter jet or a missile. The A9 section of the convergent-divergent nozzle has a mechanism that controls how large A9 can be. This is needed because the pressure of the air coming out nozzle must be equal to that of the ambient pressure other wise there will be a loss of performance in the machine. The plug nozzle however does not need to have an A9 that can vary. When the air flow comes out it can automatically sense what the ambient pressure is and will adjust accordingly. The objective of this design is to create a plug nozzle that is not as complicated mechanically as it counterpart the convergent-divergent nozzle.

  14. CAD/CAM at a Distance: Assessing the Effectiveness of Web-Based Instruction To Meet Workforce Development Needs. AIR 2000 Annual Forum Paper.

    Science.gov (United States)

    Wilkerson, Joyce A.; Elkins, Susan A.

    This qualitative case study assessed web-based instruction in a computer-aided design/computer-assisted manufacturing (CAD/CAM) course designed for workforce development. The study examined students' and instructors' experience in a CAD/CAM course delivered exclusively on the Internet, evaluating course content and delivery, clarity of…

  15. Computer-aided design in power engineering. Application of software tools

    International Nuclear Information System (INIS)

    Demonstrates the use software tools in the practice of design in the field of power systems. Presents many applications in the design in the field of power systems. Useful for educative purposes and practical work. This textbooks demonstrates the application of software tools in solving a series of problems from the field of designing power system structures and systems. It contains four chapters: The first chapter leads the reader through all the phases necessary in the procedures of computer aided modeling and simulation. It guides through the complex problems presenting on the basis of eleven original examples. The second chapter presents application of software tools in power system calculations of power systems equipment design. Several design example calculations are carried out using engineering standards like MATLAB, EMTP/ATP, Excel and Access, AutoCAD and Simulink. The third chapters focuses on the graphical documentation using a collection of software tools (AutoCAD, EPLAN, SIMARIS SIVACON, SIMARIS DESIGN) which enable the complete automation of the development of graphical documentation of a power systems. In the fourth chapter, the application of software tools in the project management in power systems is discussed. Here, the emphasis is put on the standard software MS Excel and MS Project.

  16. Computer-aided design in power engineering. Application of software tools

    Energy Technology Data Exchange (ETDEWEB)

    Stojkovic, Zlatan

    2012-07-01

    Demonstrates the use software tools in the practice of design in the field of power systems. Presents many applications in the design in the field of power systems. Useful for educative purposes and practical work. This textbooks demonstrates the application of software tools in solving a series of problems from the field of designing power system structures and systems. It contains four chapters: The first chapter leads the reader through all the phases necessary in the procedures of computer aided modeling and simulation. It guides through the complex problems presenting on the basis of eleven original examples. The second chapter presents application of software tools in power system calculations of power systems equipment design. Several design example calculations are carried out using engineering standards like MATLAB, EMTP/ATP, Excel and Access, AutoCAD and Simulink. The third chapters focuses on the graphical documentation using a collection of software tools (AutoCAD, EPLAN, SIMARIS SIVACON, SIMARIS DESIGN) which enable the complete automation of the development of graphical documentation of a power systems. In the fourth chapter, the application of software tools in the project management in power systems is discussed. Here, the emphasis is put on the standard software MS Excel and MS Project.

  17. Automotive Sheet Metal Design Via CAD Technology%汽车钣金模具CAD技术研究

    Institute of Scientific and Technical Information of China (English)

    李柏青; 赵文崇

    2012-01-01

    汽车钣金逆向CAD模型建构在汽车业界的发展已久.近年来,国内开始使用逆向工程软件,以建构曲面及特征线的方式,进行钣逆向CAD模型的建构.该方法除可以通过控制曲面质量来改善加工精度,以减少后段工程的钳修部份,更由于CAD的曲面资,可以做为设计后端各工程参考依据,使得整个开发的过程予以计算机化,节省再开发的成本.本文讨论了钣金模具逆向流程,以及汽车钣金逆向CAD模型的建构技术.%Reverse CAD models of automotive sheet metal construction of the development in the automotive industry has been investigated for a long time. In recent years, the use of reverse engineering software to construct the surface and the characteristic line, sheet metal reverse the construction of the CAD model. In addition to, the method can control the surface quality to improve the processing of continuous improvement level in order to reduce the rear section of the clamp repair part, more due to the CAD surface data, reference can be used as the design of the back-end engineering, making the entire development process to be computerized saving the cost of redevelopment. This article discusses the sheet metal mold reverse flow, and automotive sheet metal reverse CAD model constructed technology

  18. Effect of different adhesive strategies on microtensile bond strength of computer aided design/computer aided manufacturing blocks bonded to dentin

    Science.gov (United States)

    Roperto, Renato; Akkus, Anna; Akkus, Ozan; Lang, Lisa; Sousa-Neto, Manoel Damiao; Teich, Sorin; Porto, Thiago Soares

    2016-01-01

    Background: The aim of this study was to determine the microtensile bond strength (μTBS) of ceramic and composite computer aided design-computer aided manufacturing (CAD-CAM) blocks bonded to dentin using different adhesive strategies. Materials and Methods: In this in vitro study, 30 crowns of sound freshly extracted human molars were sectioned horizontally 3 mm above the cementoenamel junction to produce flat dentin surfaces. Ceramic and composite CAD/CAM blocks, size 14, were sectioned into slices of 3 mm thick. Before bonding, CAD/CAM block surfaces were treated according to the manufacturer's instructions. Groups were created based on the adhesive strategy used: Group 1 (GI) - conventional resin cement + total-etch adhesive system, Group 2 (GII) - conventional resin cement + self-etch adhesive system, and Group 3 (GIII) - self-adhesive resin cement with no adhesive. Bonded specimens were stored in 100% humidity for 24h at 37΀C, and then sectioned with a slow-speed diamond saw to obtain 1 mm × 1 mm × 6 mm microsticks. Microtensile testing was then conducted using a microtensile tester. μTBS values were expressed in MPa and analyzed by one-way ANOVA with post hoc (Tukey) test at the 5% significance level. Results: Mean values and standard deviations of μTBS (MPa) were 17.68 (±2.71) for GI/ceramic; 17.62 (±3.99) for GI/composite; 13.61 (±6.92) for GII/composite; 12.22 (±4.24) for GII/ceramic; 7.47 (±2.29) for GIII/composite; and 6.48 (±3.10) for GIII/ceramic; ANOVA indicated significant differences among the adhesive modality and block interaction (P CAD/CAM restorations, either composite or ceramic, can be significantly affected by different adhesive strategies used. PMID:27076825

  19. AutoCAD 2014 for dummies

    CERN Document Server

    Fane, Bill

    2013-01-01

    Find your way around AutoCAD 2014 with this full-color, For Dummies guide!Put away that pencil and paper and start putting the power of AutoCAD 2014 to work in your CAD projects and designs. From setting up your drawing environment to using text, dimensions, hatching, and more, this guide walks you through AutoCAD basics and provides you with a solid understanding of the latest CAD tools and techniques. You'll also benefit from the full-color illustrations that mirror exactly what you'll see on your AutoCAD 2014 screen and highlight the importance of AutoCAD's Mode

  20. CAD: How it works, how to use it, performance

    Energy Technology Data Exchange (ETDEWEB)

    Regge, Daniele, E-mail: daniele.regge@ircc.it [Institute for Cancer Research and Treatment, Candiolo-Torino (Italy); Halligan, Steve, E-mail: s.halligan@ucl.ac.uk [University College Hospital London, London (United Kingdom)

    2013-08-15

    Computer-aided diagnosis (CAD) systems are software algorithms designed to assist radiologists (or other practitioners) in solving a diagnostic problem by using a visual prompt (or “CAD mark”) to direct the observer towards potential pathology. CT colonography is a recent arrival to CAD, but could represent one of its most fruitful applications in the future. In contrast to other organs, where a variety of different pathologies are equally represented, significant colorectal pathologies other than polyps and cancer are relatively uncommon. As we shall see, this simplifies the diagnostic task for artificial intelligence developers and also for radiologists who, ultimately, must make the final decision. This review aims to present the current state-of-the-art for CAD applied to CT colonography. A brief overview of the technical essentials and of the diagnostic performance of CAD in isolation, is followed by an explanation of how CAD is used in day-to-day practice. The last section will deal with the most controversial issues affecting CAD performance in clinical practice, with a focus on the interaction between human and artificial intelligence.

  1. Complete denture fabrication supported by CAD/CAM.

    Science.gov (United States)

    Wimmer, Timea; Gallus, Korbinian; Eichberger, Marlis; Stawarczyk, Bogna

    2016-05-01

    The inclusion of computer-aided design/computer-aided manufacturing (CAD/CAM) technology into complete denture fabrication facilitates the procedures. The presented workflow for complete denture fabrication combines conventional and digitally supported treatment steps for improving dental care. With the presented technique, the registration of the occlusal plane, the determination of the ideal lip support, and the verification of the maxillomandibular relationship record are considered. PMID:26774323

  2. Computer-aided software development process design

    Science.gov (United States)

    Lin, Chi Y.; Levary, Reuven R.

    1989-01-01

    The authors describe an intelligent tool designed to aid managers of software development projects in planning, managing, and controlling the development process of medium- to large-scale software projects. Its purpose is to reduce uncertainties in the budget, personnel, and schedule planning of software development projects. It is based on dynamic model for the software development and maintenance life-cycle process. This dynamic process is composed of a number of time-varying, interacting developmental phases, each characterized by its intended functions and requirements. System dynamics is used as a modeling methodology. The resulting Software LIfe-Cycle Simulator (SLICS) and the hybrid expert simulation system of which it is a subsystem are described.

  3. Teachers’ Attitude towards Integration of Computer Assisted Instructions in Teaching and Learning Process in CAD/CAM/CNC Module

    OpenAIRE

    Abdulrasool, Salah Mahdi; Mishra, Rakesh

    2010-01-01

    The purpose of this study was to understand the effects of teachers’ attitudes, effectiveness of various teaching methods employed as well as teachers’ perceptions of the teaching experience on effectiveness of teaching-learning processes in computer-aided design/computer-aided manufacturing and computer numerical control (CAD/CAM/CNC) module used in vocational education department in Bahrain. Previous studies suggested that a part of the problem in CAD/CAM/CNC subject area is the use of inap...

  4. Forced orthodontic extrusion and use of CAD/CAM for reconstruction of grossly destructed crown: A multidisciplinary approach

    OpenAIRE

    Rahul Kumar; Suvarna Patil

    2012-01-01

    The aim of this study is to present a report of a case where forced orthodontic extrusion and computer-aided design and computer-aided manufacturing (CAD/CAM) technique was used for reconstruction of right maxillary central incisor with grossly destructed crown. Aesthetic rehabilitation of a fractured maxillary right central incisor was performed employing a multidisciplinary approach i.e. conventional endodontic treatment followed by orthodontic extrusion and final restoration using CAD-CAM ...

  5. A methodological study on organizing an intelligent CAD/CAE system for conceptual design of advanced nuclear reactor system

    International Nuclear Information System (INIS)

    In order to shorten the time span of design work and enhance both consistency and rationality of design products, the authors are now investigating an intelligent CAD/CAE system to support cooperative works by many specialists by adopting object-oriented approach. In this paper, the cognitive aspect of design activities of specialists in the conceptual design phase of nuclear reactors is discussed. The activities of the specialists in their design analysis process are highly knowledge-based and goal-oriented. The characteristics of the activities are 1) hierarchization of design goal into sub-goals, 2) prioritization of design sub-goals and step-by-step practise of design analysis, and 3) abstraction of real-world space structure into more simplified space structure to cope with theoretical treatment. Based on these consideration, a conceptual design model of specialists' activities composed of attribute modeling and design expertise knowledge base is proposed. The 'principle of functional independence' proposed by Sue is applied to bridge between the attribute modeling and design expertise knowledge base. The intelligent CAD/CAE system is now under development by focusing on the conceptual design of a space power reactor core utilizing thermo-ionic fuel elements as direct thermo-to-electric conversion. A program to calculate thermo-hydraulics of reactor core and thermo-ionic power generation has been developed. An interface has been also developed in order to communicate with the specialists at JAERI by E-mail concerning the interactive calculation between our calculation and the neutronics calculation of reactor core. (orig.)

  6. Three-dimensional computer aided design system for plant layout

    International Nuclear Information System (INIS)

    The CAD system for three-dimensional plant layout planning, with which the layout of pipings, cable trays, air conditioning ducts and so on in nuclear power plants can be planned and designed effectively in a short period is reported. This system comprises the automatic routing system by storing the rich experience and know-how of designers in a computer as the knowledge, and deciding the layout automatically following the predetermined sequence by using these, the interactive layout system for reviewing the routing results from higher level and modifying to the optimum layout, the layout evaluation system for synthetically evaluating the layout from the viewpoint of the operability such as checkup and maintenance, and the data base system which enables these effective planning and design. In this report, the total constitution of this system and the technical features and effects of the individual subsystems are outlined. In this CAD system for three-dimensional plant layout planning, knowledge engineering, CAD/CAM, computer graphics and other latest technology were introduced, accordingly by applying this system to plant design, the design can be performed quickly, various case studies can be carried out at planning stage, and systematic and optimum layout planning becomes possible. (Kako, I.)

  7. Technical evaluation of a CAD system for orthopaedic shoe-upper design.

    Science.gov (United States)

    Lord, M; Foulston, J; Smith, P J

    1991-01-01

    Computer aided design is now employed routinely in the volume shoe trade. New styles are developed on a three-dimensional image of the last followed by automated pattern generation and engineering. It is suggested that such systems could be useful in the orthopaedic footwear industry although the different requirements for these bespoke products need careful consideration. A clinical trial has been conducted on the Shoemaster (Clarks Shoes) upper design system both to assess its technical capabilities and to consider its role in improvement of service and cosmetic appearance. This particular system works throughout on a three-dimensional representation of the shoe last, which offers particular advantages for integration with shape capture and reproduction. The report concentrates on the technical evaluation to assess (a) its ability to work with unusual last shapes dictated by medical requirements and (b) its potential for integration into a complete computer system for design of both shoe lasts and shoe uppers. The trial indicates that this particular system is promising in both respects.

  8. Technical evaluation of a CAD system for orthopaedic shoe-upper design.

    Science.gov (United States)

    Lord, M; Foulston, J; Smith, P J

    1991-01-01

    Computer aided design is now employed routinely in the volume shoe trade. New styles are developed on a three-dimensional image of the last followed by automated pattern generation and engineering. It is suggested that such systems could be useful in the orthopaedic footwear industry although the different requirements for these bespoke products need careful consideration. A clinical trial has been conducted on the Shoemaster (Clarks Shoes) upper design system both to assess its technical capabilities and to consider its role in improvement of service and cosmetic appearance. This particular system works throughout on a three-dimensional representation of the shoe last, which offers particular advantages for integration with shape capture and reproduction. The report concentrates on the technical evaluation to assess (a) its ability to work with unusual last shapes dictated by medical requirements and (b) its potential for integration into a complete computer system for design of both shoe lasts and shoe uppers. The trial indicates that this particular system is promising in both respects. PMID:1840716

  9. 3D CAD Technology Curriculum Design and Reform%3D CAD技术的课程设计教改探讨

    Institute of Scientific and Technical Information of China (English)

    杨艳

    2011-01-01

    As engineering design and product development tools of 3D CAD technology is bound to spread.The development of 3D CAD technology, university teaching also poses a severe challenge,3D CAD technology, curriculum design is an important part of teaching,should be fully integrated with the traditional two-dimensional engineering drawings and CAD,three-dimensional CAD teaching,to carry out 3D CAD technology, curriculum design the use of computer technology to enhance teaching three-dimensional product modeling capabilities.%作为工程设计和产品开发工具的3D CAD技术必将普及。3DCAD技术的发展对高校教学也提出了严峻的挑战,3DCAD技术的课程设计教学是一个重要环节,应充分结合传统工程制图与二维CAD、三维CAD的教学,开展3D CAD技术的课程设计教学以提高运用计算机技术建立三维产品模型的能力。

  10. Using a Shape Model in the Design of Hearing Aids

    DEFF Research Database (Denmark)

    Paulsen, Rasmus Reinhold; Nielsen, Claus; Laugesen, Søren;

    2004-01-01

    Today the design of custom completely-in-the-canal hearing aids is a manual process and therefore there is a variation in the quality of the finished hearing aids. Especially the placement of the so-called faceplate on the hearing aid strongly influences the size and shape of the hearing aid. Since...... the future hearing aid production will be less manual there is a need for algorithms that mimic the craftsmanship of skilled operators. In this paper it is described how a statistical shape model of the ear canal can be used to predict the placement of the faceplate on a hearing aid made for a given ear...

  11. Practical Exploration on Curriculum Integration of Chemical Engineering Drawing and CAD Auxiliary Design%《化工制图》与《CAD 辅助设计》课程整合的实践探索

    Institute of Scientific and Technical Information of China (English)

    马其坤

    2014-01-01

    For the problems existing in the two separate creating courses of chemical engineering drawing and CAD auxiliary design, starting from the teaching practice, the reform scheme is proposed to integrate the teaching content of two courses. In the teaching process, the reform measures are taken, such as project teaching, integrated use of various teaching methods, manual drawing combined with CAD, strengthening practice. In the meanwhile, the inspection way is reformed. In order to make the students meet the needs of chemical industry jobs.%针对《化工制图》和《CAD 辅助设计》两门课程分开开设存在的问题,从教学实践出发,提出将两门课程的教学内容进行整合的改革方案。在教学过程中,采用项目化教学、多种教学方法综合运用、手工绘图与 CAD 相结合、加强实践环节等措施,并改革考核方式,使培养的学生更能满足化工岗位的需求。

  12. Menu Design of Ship's Application Prograe on AutoCAD VBA%基于AutoCAD VBA船舶应用程序的菜单设计

    Institute of Scientific and Technical Information of China (English)

    张远双; 熊绪

    2005-01-01

    本文介绍了基于AutoCAD VBA船舶应用程序下拉菜单的程序设计方法,包括主菜单、次菜单、菜单项及其快捷键、分隔符的设计,以及菜单宏的自动加载与运行,列举了用VBA编写的相关程序.

  13. CAD/CAM网站中动态页面的设计%Dynamic web design in CAD/CAM education web set

    Institute of Scientific and Technical Information of China (English)

    陈杰

    2004-01-01

    介绍了CAD/CAM网站中动态页面的设计.为了实现用户与网站的交互功能,在词汇查询与问题讨论部分采用ASP技术,使本站能够根据用户的需求在数据库中调取相关数据,动态生成页面.

  14. A new design of CAD/CAM surgical template system for two-piece narrowing genioplasty.

    Science.gov (United States)

    Li, B; Shen, S G; Yu, H; Li, J; Xia, J J; Wang, X

    2016-05-01

    The purpose of this study was to develop and validate a new chin template system for a two-piece narrowing genioplasty. Nine patients with wide chin deformities were enrolled. Surgeries were planned with the computer-aided surgical simulation (CASS) planning method. Surgical splints and chin templates were designed in a computer and fabricated using a three-dimensional printing technique. The chin template system included a cutting guide and a repositioning guide for a two-piece narrowing genioplasty. These guides were also designed to avoid the mental foramen area and inferior alveolar nerve loops during the osteotomy, for nerve protection. After surgery, the outcome evaluation was completed by first superimposing the postoperative computed tomography model onto the planned model, and then measuring the differences between the planned and actual outcomes. All surgeries were completed successfully using the chin template system. No inferior alveolar nerve damage was seen in this study. With the use of the chin templates, the largest linear root mean square deviation (RMSD) between the planned and the postoperative chin segments was 0.7mm and the largest angular RMSD was 4.5°. The results showed that the chin template system provides a reliable method of transfer for two-piece osseous narrowing genioplasty planning. PMID:26725914

  15. Computer aided materials design; Keisanki zairyo sekkei

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1997-03-01

    The questionnaire survey on the computer aided materials design (CAMD), and the survey of current domestic and overseas software concerned were carried out to clarify developmental issues. The current elementary technology of CAMD was also surveyed to study its several problems caused with a progress of material design technology due to drastic diffusion of CAMD. This project aims at establishment of a new demanded software, computer chemistry, focusing attention on functional materials such as catalyst, polymer and non-linear electronic materials. Microscopic simulation technology was mainly surveyed in fiscal 1996. Although some fruitful results have been obtained in the fields of medical and agricultural chemicals, organic compounds, proteins, catalysts and electronic materials, such some problems are pointed out as `CAMD cannot handle an actual size of the target system` and `commercially available software are very expensive.` Reliable tool development as elementary technology, and the verification of its applications are thus required. Meso-dynamics, polymers, surface reaction and integrated technological environment attract users` attention. 27 refs., 16 figs., 2 tabs.

  16. Integrating Real-Time Room Acoustics Simulation into a CAD Modeling Software to Enhance the Architectural Design Process

    Directory of Open Access Journals (Sweden)

    Sönke Pelzer

    2014-04-01

    Full Text Available For architects, real-time 3D visual rendering of CAD-models is a valuable tool. The architect usually perceives the visual appearance of the building interior in a natural and realistic way during the design process. Unfortunately this only emphasizes the role of the visual appearance of a building, while the acoustics often remain disregarded. Controlling the room acoustics is not integrated into most architects’ workflows—due to a lack of tools. The present contribution describes a newly developed plug-in for adding an adequate 3D-acoustics feedback to the architect. To present intuitively the acoustical effect of the current design project, the plug-in uses real-time audio rendering and 3D-reproduction. The room acoustics of the design can be varied by modifying structural shapes as well as by changing the material selection. In addition to the audio feedback, also a visualization of important room acoustics qualities is provided by displaying color-coded maps inside the CAD software.

  17. Computer-aided design and computer science technology

    Science.gov (United States)

    Fulton, R. E.; Voigt, S. J.

    1976-01-01

    A description is presented of computer-aided design requirements and the resulting computer science advances needed to support aerospace design. The aerospace design environment is examined, taking into account problems of data handling and aspects of computer hardware and software. The interactive terminal is normally the primary interface between the computer system and the engineering designer. Attention is given to user aids, interactive design, interactive computations, the characteristics of design information, data management requirements, hardware advancements, and computer science developments.

  18. Introduction to AutoCAD 2004 2D and 3D design

    CERN Document Server

    Yarwood, Alf

    2004-01-01

    Taking the reader step-by-step through the features of AutoCAD, Alf Yarwood provides a structured course of work matched to the latest release of this software. Introducing first principles and the creation of 2D technical drawings, the author goes on to demonstrate construction of 3D solid model drawings and rendering of 3D models. Worked examples and exercises are included throughout the text, to enable the reader to apply theory into real-world engineering practice, along with revision notes and exercises at the end of chapters for the reader to check their understanding of the material the

  19. Understanding dental CAD/CAM for restorations--the digital workflow from a mechanical engineering viewpoint.

    Science.gov (United States)

    Tapie, L; Lebon, N; Mawussi, B; Fron Chabouis, H; Duret, F; Attal, J-P

    2015-01-01

    As digital technology infiltrates every area of daily life, including the field of medicine, so it is increasingly being introduced into dental practice. Apart from chairside practice, computer-aided design/computer-aided manufacturing (CAD/CAM) solutions are available for creating inlays, crowns, fixed partial dentures (FPDs), implant abutments, and other dental prostheses. CAD/CAM dental solutions can be considered a chain of digital devices and software for the almost automatic design and creation of dental restorations. However, dentists who want to use the technology often do not have the time or knowledge to understand it. A basic knowledge of the CAD/CAM digital workflow for dental restorations can help dentists to grasp the technology and purchase a CAM/CAM system that meets the needs of their office. This article provides a computer-science and mechanical-engineering approach to the CAD/CAM digital workflow to help dentists understand the technology. PMID:25911827

  20. Comparative fracture strength analysis of Lava and Digident CAD/CAM zirconia ceramic crowns

    Science.gov (United States)

    Kwon, Taek-Ka; Pak, Hyun-Soon; Han, Jung-Suk; Lee, Jai-Bong; Kim, Sung-Hun

    2013-01-01

    PURPOSE All-ceramic crowns are subject to fracture during function. To minimize this common clinical complication, zirconium oxide has been used as the framework for all-ceramic crowns. The aim of this study was to compare the fracture strengths of two computer-aided design/computer-aided manufacturing (CAD/CAM) zirconia crown systems: Lava and Digident. MATERIALS AND METHODS Twenty Lava CAD/CAM zirconia crowns and twenty Digident CAD/CAM zirconia crowns were fabricated. A metal die was also duplicated from the original prepared tooth for fracture testing. A universal testing machine was used to determine the fracture strength of the crowns. RESULTS The mean fracture strengths were as follows: 54.9 ± 15.6 N for the Lava CAD/CAM zirconia crowns and 87.0 ± 16.0 N for the Digident CAD/CAM zirconia crowns. The difference between the mean fracture strengths of the Lava and Digident crowns was statistically significant (P<.001). Lava CAD/CAM zirconia crowns showed a complete fracture of both the veneering porcelain and the core whereas the Digident CAD/CAM zirconia crowns showed fracture only of the veneering porcelain. CONCLUSION The fracture strengths of CAD/CAM zirconia crowns differ depending on the compatibility of the core material and the veneering porcelain. PMID:23755332

  1. Art,Science and Technology——Computed Aided Design in Practice & How computer technology affect designer’s work

    Institute of Scientific and Technical Information of China (English)

    赵耀

    2010-01-01

    Introduction:Computing technology has developed significantly in the past few decades.It affects almost everyone in the modern society,creating new ways of communication which affects both our work and leisure activities.Particularly,in today’s world of design and technology,computer aided design is fast becoming a technologically and economically feasible reality.Most designers have accepted the fact that computer aided design plays an important role in the success of their practices,not due to it’s value as an efficient drafting and modeling tool,but also because of clients’perception that it makes sound financial sense to utilize CAD.On the other hand,many people argue that computers are not fully autonomous,they are merely unconscious digital slaves or tools of production.In addition,the abusive use of software technology would turn creative art design into a purely industrial activity.

  2. Computer Aided Design and Analysis of a 2-4 GHz Broadband Balanced Microstrip Amplifier

    Directory of Open Access Journals (Sweden)

    S. H. Ibrahim

    2012-07-01

    Full Text Available In this paper, a computer-aided design and analysis of a 2-4 GHz broadband balanced microstrip amplifier using a full computer simulation program developed by the author and others is presented. A short and efficient CAD procedure for broadband amplifier design is introduced. The first step is to design an initial narrow-band high gain microstrip amplifier at 3-GHz central frequency. The second step is to optimize the initial lengths and widths of the input and output microstrip-matching circuits to get the broadband amplifier over the range 2-4 GHz. The analysis of both narrow and broadband amplifiers is investigated. In addition, with the design and analysis of a low-pass microstrip filter, the paper introduces the design and analysis of a Lange coupler. The final AC schematic diagram of the designed amplifier with the lengths and widths of microstrip lines is presented.Key Words: Computer-Aided Design and Analysis, Microstrip Amplifier, Microwave Amplifier.

  3. Design of fabric CAD based on ARM%基于ARM的织物CAD软件设计

    Institute of Scientific and Technical Information of China (English)

    刘家希; 王跃存; 马崇启

    2012-01-01

    以Samsung公司的S3C6410为主芯片,Linux为嵌入式系统,Qt/Embedded为用户图形界面构成硬件平台;以Window系统+VMware虚拟机形式提供开发环境,利用Qt软件开发基于ARM平台的织物CAD软件,实现织物组织设计、色纱排列、织物参数设计、系统通讯存储等功能.与传统基于PC平台的织物CAD相比,此系统操作简单,界面友好,具有很强的实用性.%The hardware platform is constituted by Samsung S3C6410 chip, Linux operating system and the interface that is made by Qt/Embedded. A developing environment is provided by the windows system and VMware virtual machine, and the software of textile CAD is developed by using the Qt to complete some functions such as the fabric weave design, yam arrangement, fabric parameter design, communication and storage and so on. Comparing to the traditional software of textile CAD based on PC, this system has the convenience, friendly interface and highly practical.

  4. Proposal for providing integrated CAD/CAM in the DOE/NWC

    Energy Technology Data Exchange (ETDEWEB)

    Crowe, R.A.; Elliott, R.L.; Jones, J.F.; Kelly, J.C.

    1982-08-01

    This is a proposal for providing integrated Computer-Aided Design/Computer-Aided Manufacturing (CAD/CAM) in the Department of Energy/Nuclear Weapons Complex (DOE/NWC). This plan was developed under the premise that commitment to this CAD/CAM Integration Plan will lead to improved use of DOE/NWC's limited resources. The Integration Plan consists of the development of a Design with recommended action, followed by implementation and maintenance plans. This report proposes a methodology for the development of the design.

  5. RAPID CREATION OF CFD-CAPABLE CAD-MODELS FOR CABIN AIR VENTILATION SIMULATION

    OpenAIRE

    Fuchte, Jörg; Wick, Andreas; Rajkowski, Sergej

    2011-01-01

    The objective of this paper is to describe a method for rapid creation of cabin CAD (Computer Aided Design) models for usage in CFD (Computational Fluid Dynamics) simulations of cabin air ventilation. The intention is to automate the process of model creation in order to speed up the process and reduce the workload both in CAD modeling and mesh creation. The described method is part of a larger process intended to facilitate the usage of CFD cabin air ventilation simulations for passenger com...

  6. Marginal Integrity of CAD/CAM Fixed Partial Dentures

    OpenAIRE

    Rosentritt, Martin; Behr, Michael; Kolbeck, Carola; Handel, Gerhard

    2007-01-01

    Objectives Computer-aided design (CAD) and manufacturing (CAM) allows the milling of high strength zirconia fixed partial dentures (FPD), however bonding to an inert ZrO2 ceramic surface may effect the marginal integrity of the FPDs. The aim of this investigation was to evaluate the marginal adaptation of zirconia FPDs at the interfaces between zirconia, cement, and tooth. Methods 32 3-unit FPDs were fabricated of the CAD/CAM Y-TZP zirconia (Lava, 3M Espe, Germany) according to the manufactur...

  7. Construction CAE; Integration of CAD, simulation, planning and cost control

    Energy Technology Data Exchange (ETDEWEB)

    Wickard, D.A. (Bechtel Power Corp., Los Angeles, CA (USA)); Bill, R.D.; Gates, K.H.; Yoshinaga, T.; Ohcoshi, S. (Nuclear Engineering and Construction Dept., Hitachi Works, Hitachi Ltd., Hitachi (JP))

    1989-01-01

    Construction CAE is a simulation, planning, scheduling, and cost control tool that is integrated with a computer aided design (CAD) system. The system uses a CAD model and allows the user to perform construction simulation on objects defined within the model. Initial cost/schedule reports as well as those required for project chronicling are supported through an interface to a work breakdown structure (WBS) and a client's existing schedule reporting system. By integrating currently available project control tools with a simulation system, Construction CAE is more effective than its individual components.

  8. Application of CAD/CAE/CAM in forging process: a review

    International Nuclear Information System (INIS)

    Forging can be described as the process in which metal is plastically deformed with application of huge pressure. The process not only changes the shape but also improves the properties of the forged parts due to grain size refinement. Conventionally, the empirical trial and error method has been applied, but recently there are various tools are employed to improved product quality and economic of the process. For example, Computer Aided Design (CAD) is widely used in modeling of the process, while Computer Aided Engineering (CAE) tools have been utilized in analyzing the process. To physically demonstrate the process, Computer Aided Manufacturing (CAM) such as CNC machine has been exploited. In order to improve forging process efficiency, an integrated system that combines all advantages of CAD, CAM and CAE need to be developed. This paper presents an overview of computer aided simulation such as CAD, CAE and CAM application in forging process. (Author)

  9. The study of CAD/CAPP concurrent design system based on Internet%基于 Internet的 CAD/CAPP 并行设计系统的研究

    Institute of Scientific and Technical Information of China (English)

    陈志伟; 易红; 倪中华; 蒋伟

    2001-01-01

    因特网( Internet)作为信息传递与共享的主要载体,为解决企业在分布式设计和制造环境下的信息交流问题提供了强有力的支持。本文对应用 Internet技术和并行工程的思想实现 CAD/CAPP并行设计系统所涉及的关键支撑技术进行了研究,在此基础上建立了基于 Internet的 CAD/CAPP并行设计系统的体系结构和工作流程。%As a primary media of information transformation and sharing, Internet offers a strong support in solving the cooperate information exchanging problem in the distribute design and manufacturing environments. Applying today Internet technologies (including Intranet and Extranet)and the concept of Concurrent Engineering (CE),the paper study the key supporting technique for realizing CAD/CAPP concurrent design system, and corresponding system structure ,working process are builded.

  10. AutoCAD 2008 for dummies

    CERN Document Server

    Byrnes, David

    2007-01-01

    A gentle, humorous introduction to this fearsomely complex software that helps new users start creating 2D and 3D technical drawings right awayCovers the new features and enhancements in the latest AutoCAD version and provides coverage of AutoCAD LT, AutoCAD''s lower-cost siblingTopics covered include creating a basic layout, using AutoCAD DesignCenter, drawing and editing, working with dimensions, plotting, using blocks, adding text to drawings, and drawing on the InternetAutoCAD is the leading CAD software for architects, engineers, and draftspeople who need to create detailed 2D and 3D tech

  11. Marginal accuracy of four-unit zirconia fixed dental prostheses fabricated using different computer-aided design/computer-aided manufacturing systems.

    Science.gov (United States)

    Kohorst, Philipp; Brinkmann, Henrike; Li, Jiang; Borchers, Lothar; Stiesch, Meike

    2009-06-01

    Besides load-bearing capacity, marginal accuracy is a further crucial factor influencing the clinical long-term reliability of fixed dental prostheses (FDPs). The aim of this in vitro study was to evaluate the marginal fit of four-unit zirconia bridge frameworks fabricated using four different computer-aided design (CAD)/computer-aided manufacturing (CAM) systems. Ten frameworks were manufactured using each fabricating system. Three systems (inLab, Everest, Cercon) processed white-stage zirconia blanks, which had to be sintered to final density after milling, while with one system (Digident) restorations were directly milled from a fully sintered material. After manufacturing, horizontal and vertical marginal discrepancies, as well as the absolute marginal discrepancy, were determined by means of a replica technique. The absolute marginal discrepancy, which is considered to be the most suitable parameter reflecting restorations' misfit in the marginal area, had a mean value of 58 mum for the Digident system. By contrast, mean absolute marginal discrepancies for the three other systems, processing presintered blanks, differed significantly and ranged between 183 and 206 mum. Within the limitations of this study, it could be concluded that the marginal fit of zirconia FDPs is significantly dependent on the CAD/CAM system used, with restorations processed of fully sintered zirconia showing better fitting accuracy. PMID:19583762

  12. Fatigue analysis of computer-aided design/computer-aided manufacturing resin-based composite vs. lithium disilicate glass-ceramic.

    Science.gov (United States)

    Ankyu, Shuhei; Nakamura, Keisuke; Harada, Akio; Hong, Guang; Kanno, Taro; Niwano, Yoshimi; Örtengren, Ulf; Egusa, Hiroshi

    2016-08-01

    Resin-based composite molar crowns made by computer-aided design/computer-aided manufacturing (CAD/CAM) systems have been proposed as an inexpensive alternative to metal-ceramic or all-ceramic crowns. However, there is a lack of scientific information regarding fatigue resistance. This study aimed to analyze the fatigue behavior of CAD/CAM resin-based composite compared with lithium disilicate glass-ceramic. One-hundred and sixty bar-shaped specimens were fabricated using resin-based composite blocks [Lava Ultimate (LU); 3M/ESPE] and lithium disilicate glass-ceramic [IPS e.max press (EMP); Ivoclar/Vivadent]. The specimens were divided into four groups: no treatment (NT); thermal cycling (TC); mechanical cycling (MC); and thermal cycling followed by mechanical cycling (TCMC). Thermal cycling was performed by alternate immersion in water baths of 5°C and 55°C for 5 × 10(4) cycles. Mechanical cycling was performed in a three-point bending test, with a maximum load of 40 N, for 1.2 × 10(6) cycles. In addition, LU and EMP molar crowns were fabricated and subjected to fatigue treatments followed by load-to-failure testing. The flexural strength of LU was not severely reduced by the fatigue treatments. The fatigue treatments did not significantly affect the fracture resistance of LU molar crowns. The results demonstrate the potential of clinical application of CAD/CAM-generated resin-based composite molar crowns in terms of fatigue resistance. PMID:27203408

  13. Research on Computer Aided Design (CAD) Technique and Novel Pattern for Electronic Architectural Drawing and Perspective

    Institute of Scientific and Technical Information of China (English)

    Tian XiJiang

    2015-01-01

    With the progress of computer technology, CAD technique is urgent needed. In this paper, we conduct numerical and theoretical analysis and research on computer aided design technique and novel pattern for electronic architectural drawing and perspective. AUTOCAD drawing soRware because of its versatility and easy entry, in engineering has broad user base, but also because of the basis of general drawing software, often cannot directly use of the existing order efficiently complete professional drawing. We modify the current pattern and introduce our proposed pattern for advancement. The experiment proves the effectiveness of the pattern. In addition, we will conduct more insightful research in the future to nolish the current anoroach.

  14. Methodology for benefit analysis of CAD/CAM in USN shipyards.

    OpenAIRE

    Grahlman, Richard B.

    1984-01-01

    Approved for public release; distribution in unlimited. This thesis expands the concept of Computer-Aided Design/Computer-Aided Manufacturing (CAD/CAM) in naval shipbuilding to include maintenance. This inclusion is coupled with the integration of the design and manufacturing processes in the acronym CIDMM, which stands for Computer-Integrated Design, Manufacture and Maintenance. http://archive.org/details/methodologyforbe00grah Lieutenant Commander, United States Navy

  15. Development of CAD software package of intellectualized casting technology

    Institute of Scientific and Technical Information of China (English)

    HOU Hua; CHENG Jun; XU Hong

    2005-01-01

    Based on the numerical simulation of solidification, a computer aid design(CAD) software package of casting technique was developed to design the rising system intelligently. The software can calculate the size and locate the situations of the isolated melts. According to the liquid shrinkage of each isolated melts and the standard parameters of risers in the database, the riser's situation and the size can be identified intelligently as long as the riser's shape is selected. 3-D software and simulation analysis of CAST soft/computer aid engineering(CAE) software show that the design of the riser and the running system is feasible.

  16. Cool-and Unusual-CAD Applications

    Science.gov (United States)

    Calhoun, Ken

    2004-01-01

    This article describes several very useful applications of AutoCAD that may lie outside the normal scope of application. AutoCAD commands used in this article are based on AutoCAD 2000I. The author and his students used a Hewlett Packard 750C DesignJet plotter for plotting. (Contains 5 figures and 5 photos.)

  17. Computer aided pantograph design for garment panels

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Discusses the difficulties and problems with manual pantograph ofgarment panels, introduces several typical pantographic ways and their characteristics both at home and abroad, presents a new pantographic method based on similar figures developed to overcome the deficiency of those methods, so as to realize computer aid automatic panel pantograph.

  18. Full-wave CAD of a rectangular waveguide filter with integrated coaxial excitation

    NARCIS (Netherlands)

    Gerini, G.; Guglielmi, M.

    2001-01-01

    Coaxial waveguides are very commonly used in many microwave subsystems for the connection of various components. Significant size reduction could, therefore, be achieved by integrating the design of the coaxial transition in the computer-aided design (CAD) of microwave filters. In this context, we f

  19. Complete-mouth rehabilitation using a 3D printing technique and the CAD/CAM double scanning method: A clinical report.

    Science.gov (United States)

    Joo, Han-Sung; Park, Sang-Won; Yun, Kwi-Dug; Lim, Hyun-Pil

    2016-07-01

    According to evolving computer-aided design/computer-aided manufacturing (CAD/CAM) technology, ceramic materials such as zirconia can be used to create fixed dental prostheses for partial removable dental prostheses. Since 3D printing technology was introduced a few years ago, dental applications of this technique have gradually increased. This clinical report presents a complete-mouth rehabilitation using 3D printing and the CAD/CAM double-scanning method.

  20. Complete-mouth rehabilitation using a 3D printing technique and the CAD/CAM double scanning method: A clinical report.

    Science.gov (United States)

    Joo, Han-Sung; Park, Sang-Won; Yun, Kwi-Dug; Lim, Hyun-Pil

    2016-07-01

    According to evolving computer-aided design/computer-aided manufacturing (CAD/CAM) technology, ceramic materials such as zirconia can be used to create fixed dental prostheses for partial removable dental prostheses. Since 3D printing technology was introduced a few years ago, dental applications of this technique have gradually increased. This clinical report presents a complete-mouth rehabilitation using 3D printing and the CAD/CAM double-scanning method. PMID:26946918

  1. CFD Aided Design and Production of Hydraulic Turbines

    Science.gov (United States)

    Kaplan, Alper; Cetinturk, Huseyin; Demirel, Gizem; Ayli, Ece; Celebioglu, Kutay; Aradag, Selin; ETU Hydro Research Center Team

    2014-11-01

    Hydraulic turbines are turbo machines which produce electricity from hydraulic energy. Francis type turbines are the most common one in use today. The design of these turbines requires high engineering effort since each turbine is tailor made due to different head and discharge. Therefore each component of the turbine is designed specifically. During the last decades, Computational Fluid Dynamics (CFD) has become very useful tool to predict hydraulic machinery performance and save time and money for designers. This paper describes a design methodology to optimize a Francis turbine by integrating theoretical and experimental fundamentals of hydraulic machines and commercial CFD codes. Specific turbines are designed and manufactured with the help of a collaborative CFD/CAD/CAM methodology based on computational fluid dynamics and five-axis machining for hydraulic electric power plants. The details are presented in this study. This study is financially supported by Turkish Ministry of Development.

  2. Assessment of the Incremental Benefit of Computer-Aided Detection (CAD for Interpretation of CT Colonography by Experienced and Inexperienced Readers.

    Directory of Open Access Journals (Sweden)

    Darren Boone

    Full Text Available To quantify the incremental benefit of computer-assisted-detection (CAD for polyps, for inexperienced readers versus experienced readers of CT colonography.10 inexperienced and 16 experienced radiologists interpreted 102 colonography studies unassisted and with CAD utilised in a concurrent paradigm. They indicated any polyps detected on a study sheet. Readers' interpretations were compared against a ground-truth reference standard: 46 studies were normal and 56 had at least one polyp (132 polyps in total. The primary study outcome was the difference in CAD net benefit (a combination of change in sensitivity and change in specificity with CAD, weighted towards sensitivity for detection of patients with polyps.Inexperienced readers' per-patient sensitivity rose from 39.1% to 53.2% with CAD and specificity fell from 94.1% to 88.0%, both statistically significant. Experienced readers' sensitivity rose from 57.5% to 62.1% and specificity fell from 91.0% to 88.3%, both non-significant. Net benefit with CAD assistance was significant for inexperienced readers but not for experienced readers: 11.2% (95%CI 3.1% to 18.9% versus 3.2% (95%CI -1.9% to 8.3% respectively.Concurrent CAD resulted in a significant net benefit when used by inexperienced readers to identify patients with polyps by CT colonography. The net benefit was nearly four times the magnitude of that observed for experienced readers. Experienced readers did not benefit significantly from concurrent CAD.

  3. Computer-aided dispatching system design specification

    Energy Technology Data Exchange (ETDEWEB)

    Briggs, M.G.

    1997-12-16

    This document defines the performance requirements for a graphic display dispatching system to support Hanford Patrol Operations Center. This document reflects the as-built requirements for the system that was delivered by GTE Northwest, Inc. This system provided a commercial off-the-shelf computer-aided dispatching system and alarm monitoring system currently in operations at the Hanford Patrol Operations Center, Building 2721E. This system also provides alarm back-up capability for the Plutonium Finishing Plant (PFP).

  4. Computer-aided dispatching system design specification

    International Nuclear Information System (INIS)

    This document defines the performance requirements for a graphic display dispatching system to support Hanford Patrol Operations Center. This document reflects the as-built requirements for the system that was delivered by GTE Northwest, Inc. This system provided a commercial off-the-shelf computer-aided dispatching system and alarm monitoring system currently in operations at the Hanford Patrol Operations Center, Building 2721E. This system also provides alarm back-up capability for the Plutonium Finishing Plant (PFP)

  5. C2CAD: A SUSTAINABLE APPAREL DESIGN AND PRODUCTION CONCEPTUAL FRAMEWORK

    Science.gov (United States)

    Many environmental problems related to apparel industry, such as toxicity in dyeing wastewater, could be minimized by apparel designers and manufacturers. However, no apparel design and production model put designers' role in environmental sustainability into consideration. ...

  6. TEACHING CAD PROGRAMMING TO ARCHITECTURE STUDENTS

    Directory of Open Access Journals (Sweden)

    Maria Gabriela Caffarena CELANI

    2008-11-01

    Full Text Available The objective of this paper is to discuss the relevance of including the discipline of computer programming in the architectural curriculum. To do so I start by explaining how computer programming has been applied in other educational contexts with pedagogical success, describing Seymour Papert's principles. After that, I summarize the historical development of CAD and provide three historical examples of educational applications of computer programming in architecture, followed by a contemporary case that I find of particular relevance. Next, I propose a methodology for teaching programming for architects that aims at improving the quality of designs by making their concepts more explicit. This methodology is based on my own experience teaching computer programming for architecture students at undergraduate and graduate levels at the State University of Campinas, Brazil. The paper ends with a discussion about the role of programming nowadays, when most CAD software are user-friendly and do not require any knowledge of programming for improving performance. I conclude that the introduction of programming in the CAD curriculum within a proper conceptual framework may transform the concept of architectural education. Key-words: Computer programming; computer-aided design; architectural education.

  7. Role of radiologists in CAD life-cycle

    International Nuclear Information System (INIS)

    A modern CAD (computer-aided diagnosis) system development involves a multidisciplinary team whose members are experts in medical and technical fields. This study indicates the activities of medical experts at various stages of the CAD design, testing, and implementation. Those stages include a medical analysis of the diagnostic problem, data collection, image analysis, evaluation, and clinical verification. At each stage the physicians knowledge and experience are indispensable. The final implementation involves integration with the existing Picture Archiving and Communication System. The term CAD life-cycle describes an overall process of the design, testing, and implementation of a system that in its final form assists the radiologists in their daily clinical routine. Four CAD systems (applied to the bone age assessment, Multiple Sclerosis detection, lung nodule detection, and pneumothorax measurement) developed in our laboratory are given as examples of how consecutive stages are developed by the multidisciplinary team. Specific advantages of the CAD implementation that include the daily clinical routine as well as research and education activities are discussed.

  8. Role of radiologists in CAD life-cycle

    Energy Technology Data Exchange (ETDEWEB)

    Pietka, Ewa, E-mail: ewa.pietka@polsl.pl [Silesian University of Technology, Faculty of Automatic Control, Electronics and Computer Science, ul. Akademicka 16, 44-100 Gliwice (Poland); Kawa, Jacek, E-mail: jacek.kawa@polsl.pl [Silesian University of Technology, Faculty of Automatic Control, Electronics and Computer Science, ul. Akademicka 16, 44-100 Gliwice (Poland); Spinczyk, Dominik, E-mail: dominik.spinczyk@polsl.pl [Silesian University of Technology, Faculty of Automatic Control, Electronics and Computer Science, ul. Akademicka 16, 44-100 Gliwice (Poland); Badura, Pawel, E-mail: pawel.badura@polsl.pl [Silesian University of Technology, Faculty of Automatic Control, Electronics and Computer Science, ul. Akademicka 16, 44-100 Gliwice (Poland); Wieclawek, Wojciech, E-mail: wojciech.wieclawek@polsl.pl [Silesian University of Technology, Faculty of Automatic Control, Electronics and Computer Science, ul. Akademicka 16, 44-100 Gliwice (Poland); Czajkowska, Joanna, E-mail: joanna.czajkowska@polsl.pl [Silesian University of Technology, Faculty of Automatic Control, Electronics and Computer Science, ul. Akademicka 16, 44-100 Gliwice (Poland); Rudzki, Marcin, E-mail: marcin.rudzki@polsl.pl [Silesian University of Technology, Faculty of Automatic Control, Electronics and Computer Science, ul. Akademicka 16, 44-100 Gliwice (Poland)

    2011-05-15

    A modern CAD (computer-aided diagnosis) system development involves a multidisciplinary team whose members are experts in medical and technical fields. This study indicates the activities of medical experts at various stages of the CAD design, testing, and implementation. Those stages include a medical analysis of the diagnostic problem, data collection, image analysis, evaluation, and clinical verification. At each stage the physicians knowledge and experience are indispensable. The final implementation involves integration with the existing Picture Archiving and Communication System. The term CAD life-cycle describes an overall process of the design, testing, and implementation of a system that in its final form assists the radiologists in their daily clinical routine. Four CAD systems (applied to the bone age assessment, Multiple Sclerosis detection, lung nodule detection, and pneumothorax measurement) developed in our laboratory are given as examples of how consecutive stages are developed by the multidisciplinary team. Specific advantages of the CAD implementation that include the daily clinical routine as well as research and education activities are discussed.

  9. Interoperability of CAD Standards and Robotics in CIME

    DEFF Research Database (Denmark)

    Sørensen, Torben

    The research presented in this dissertation concerns the identification of problems and provision of solutions for increasing the degree of interoperability between CAD, CACSD (Computer Aided Control Systems Design) and CAR (Computer Aided Robotics) in Computer Integrated Manufacturing and Engine......The research presented in this dissertation concerns the identification of problems and provision of solutions for increasing the degree of interoperability between CAD, CACSD (Computer Aided Control Systems Design) and CAR (Computer Aided Robotics) in Computer Integrated Manufacturing......· The development of a STEP based interface for general control system data and functions, especially related to robot motion control for interoperability of CAD, CACSD, and CAR systems for the extension of the inter-system communication capabilities beyond the stage achieved up to now.This interface development...... comprehends the following work:· The definition of the concepts of 'information' and 'information model', and the selection of a proper information modeling methodology within the STEP methodologies.· The elaboration of a general function model of a generic robot motion controller in IDEF0 for interface...

  10. El CAD en la actividad de reingeniería e ingeniería en los mantenimientos a centrales eléctricas // CAD in the reengineering and engineering activity in maintenance of power plants

    Directory of Open Access Journals (Sweden)

    R. García Ramírez

    2000-07-01

    Full Text Available El presente trabajo muestra algunas experiencias obtenidas en la actividad de ingeniería y reingeniería durante elmantenimiento a centrales eléctricas con empleo del CAD (Computer Aided Design, se muestran además las estrategiasseguidas con vistas a automatizar la actividad de reingeniería en ordenadores y a lograr mejoras económicas en la actividada costa de disminuir los costos de producción.Palabras claves: CAD, reingeniería, mantenimiento de calderas._________________________________________________________________________AbstractThe present work shows some experiences obtained in the engineering and reengineering during the maintenance activity inpower plants carried out by our company applying the CAD (Computer Aided Design, it is also exposed the strategyfollowed with a view to automating the reengineering activity with the use of computers, keeping in mind a view to achieveconomic improvements in the activity to diminish production costs.Key words: reengineering, CAD, maintenance, boiler.

  11. CAD/CAM-assisted breast reconstruction.

    Science.gov (United States)

    Melchels, Ferry; Wiggenhauser, Paul Severin; Warne, David; Barry, Mark; Ong, Fook Rhu; Chong, Woon Shin; Hutmacher, Dietmar Werner; Schantz, Jan-Thorsten

    2011-09-01

    The application of computer-aided design and manufacturing (CAD/CAM) techniques in the clinic is growing slowly but steadily. The ability to build patient-specific models based on medical imaging data offers major potential. In this work we report on the feasibility of employing laser scanning with CAD/CAM techniques to aid in breast reconstruction. A patient was imaged with laser scanning, an economical and facile method for creating an accurate digital representation of the breasts and surrounding tissues. The obtained model was used to fabricate a customized mould that was employed as an intra-operative aid for the surgeon performing autologous tissue reconstruction of the breast removed due to cancer. Furthermore, a solid breast model was derived from the imaged data and digitally processed for the fabrication of customized scaffolds for breast tissue engineering. To this end, a novel generic algorithm for creating porosity within a solid model was developed, using a finite element model as intermediate. PMID:21900731

  12. Marginal fit of anterior 3-unit fixed partial zirconia restorations using different CAD/CAM systems

    OpenAIRE

    Song, Tae-Jin; Kwon, Taek-Ka; Yang, Jae-Ho; Han, Jung-Suk; Lee, Jai-Bong; Kim, Sung-Hun; Yeo, In-Sung

    2013-01-01

    PURPOSE Few studies have investigated the marginal accuracy of 3-unit zirconia fixed partial dentures (FPDs) fabricated by computer-aided design/computer-aided manufacturing (CAD/CAM) system. The purpose of this study was to compare the marginal fit of zirconia FPDs made using two CAD/CAM systems with that of metal-ceramic FPDs. MATERIALS AND METHODS Artificial resin maxillary central and lateral incisors were prepared for 3-unit FPDs and fixed in yellow stone. This model was duplicated to ep...

  13. AutoCAD 2015 and AutoCAD LT 2015 bible

    CERN Document Server

    Finkelstein, Ellen

    2014-01-01

    The perfect reference for all AutoCAD users AutoCAD 2015 and AutoCAD LT 2015 Bible is the book you want to have close at hand to answer those day-to-day questions about this industry-leading software. Author and Autodesk University instructor Ellen Finkelstein guides readers through AutoCAD 2015 and AutoCAD LT 2015 with clear, easy-to-understand instruction and hands-on tutorials that allow even total beginners to create a design on their very first day. Although simple and fundamental enough to be used by those new to CAD, the book is so comprehensive that even Autodesk power u

  14. Three-unit posterior zirconia-ceramic fixed dental prostheses (FDPs) veneered with layered and milled (CAD-on) veneering ceramics: 1-year follow-up of a randomized controlled clinical trial

    OpenAIRE

    Grohmann, Philipp; Bindl, Andreas; Hämmerle, Christoph; Mehl, Albert; Sailer, Irena

    2015-01-01

    The aim of this multicenter randomized controlled clinical trial was to test posterior zirconia-ceramic fixed dental prostheses (FDPs) veneered with a computer-aided design/computer- assisted manufacture (CAD/CAM) lithium disilicate veneering ceramic (CAD-on) and manually layered zirconia veneering ceramic with respect to survival of the FDPs, and technical and biologic outcomes.

  15. Development and some applications of general purpose CAD/CAM/CAE system -IMAGE-

    International Nuclear Information System (INIS)

    General purpose CAD/CAM/CAE system, named IMAGE (Interactive Modeling Aids for Graphics in Engineering), has been developed. This system is composed of several subsystems. Two modeling types are available, one is a wire frame model and the other is a surface model. CAD subsystems for drawings, piping and preliminary design, CAM subsystems for NC programming/nesting and CAE subsystems for FEM preprocessing are described. Three applications are described. The first application field is the boiler plant design, the second one the nuclear equipment engineering design and the third one the industrial machinery design. (author)

  16. Performative Computation-aided Design Optimization

    Directory of Open Access Journals (Sweden)

    Ming Tang

    2012-12-01

    Full Text Available This article discusses a collaborative research and teaching project between the University of Cincinnati, Perkins+Will’s Tech Lab, and the University of North Carolina Greensboro. The primary investigation focuses on the simulation, optimization, and generation of architectural designs using performance-based computational design approaches. The projects examine various design methods, including relationships between building form, performance and the use of proprietary software tools for parametric design.

  17. Computer-aided design of electrical machines

    CERN Document Server

    Murthy, KM Vishnu

    2008-01-01

    The aim of this book is to present the sequential steps for developing the computer programs for the design of electrical machines, using well-established design formulae. The data of magnetic and non-magnetic materials used in latest designs by industries, is applied for optimizing the design. Salient Features: MATLAB Version of C Language is used for computer programming because of its easiness and simplicity over conventional C Program. The total program is split into a number of parts and each part is run independently. The total program for total design is obtained by adding the programs

  18. CAD/CAM method application for ear shell auto-manufacturing

    Science.gov (United States)

    Jarng, Soon Suck; Ting, Gao

    2010-01-01

    This paper presents the engineering technique of the rapid hearing aid production with a rapid shell modelling (RSM) Computer Aided Design/Manufacturing (CAD/CAM). It will be worthwhile to describe how the virtual ear shell designed with RSM from an ear impression. And the virtual ear shell model is then used as the template to manufacture the actual ear shell by a Rapid Production (RP) machine. Some detailed description of the whole processing will be given in this thesis. The CAD/CAM method processing will enhance and provide outstanding, high-quality hearing aid shell production capabilities to customers. It reduces the time and the cost of designing products and facilitates direct and indirect manufacturing by creating actual parts directly from digital input. It determines that this technique has made a large impact on hearing aid processing and fitting.

  19. AutoCAD 2014 essentials

    CERN Document Server

    Onstott, Scott

    2013-01-01

    Learn crucial AutoCAD tools and techniques with this Autodesk Official Press Book Quickly become productive using AutoCAD 2014 and AutoCAD LT 2014 with this full color Autodesk Official Press guide. This unique learning resource features concise, straightforward explanations and real-world, hands-on exercises and tutorials. Following a quick discussion of concepts and goals, each chapter moves on to an approachable hands-on exercise designed to reinforce real-world tactics and techniques. Compelling, full-color screenshots illustrate tutorial steps, and chapters conclude with relat

  20. Rationale for the Use of CAD/CAM Technology in Implant Prosthodontics

    Science.gov (United States)

    Abduo, Jaafar; Lyons, Karl

    2013-01-01

    Despite the predictable longevity of implant prosthesis, there is an ongoing interest to continue to improve implant prosthodontic treatment and outcomes. One of the developments is the application of computer-aided design and computer-aided manufacturing (CAD/CAM) to produce implant abutments and frameworks from metal or ceramic materials. The aim of this narrative review is to critically evaluate the rationale of CAD/CAM utilization for implant prosthodontics. To date, CAD/CAM allows simplified production of precise and durable implant components. The precision of fit has been proven in several laboratory experiments and has been attributed to the design of implants. Milling also facilitates component fabrication from durable and aesthetic materials. With further development, it is expected that the CAD/CAM protocol will be further simplified. Although compelling clinical evidence supporting the superiority of CAD/CAM implant restorations is still lacking, it is envisioned that CAD/CAM may become the main stream for implant component fabrication. PMID:23690778

  1. Rationale for the Use of CAD/CAM Technology in Implant Prosthodontics

    Directory of Open Access Journals (Sweden)

    Jaafar Abduo

    2013-01-01

    Full Text Available Despite the predictable longevity of implant prosthesis, there is an ongoing interest to continue to improve implant prosthodontic treatment and outcomes. One of the developments is the application of computer-aided design and computer-aided manufacturing (CAD/CAM to produce implant abutments and frameworks from metal or ceramic materials. The aim of this narrative review is to critically evaluate the rationale of CAD/CAM utilization for implant prosthodontics. To date, CAD/CAM allows simplified production of precise and durable implant components. The precision of fit has been proven in several laboratory experiments and has been attributed to the design of implants. Milling also facilitates component fabrication from durable and aesthetic materials. With further development, it is expected that the CAD/CAM protocol will be further simplified. Although compelling clinical evidence supporting the superiority of CAD/CAM implant restorations is still lacking, it is envisioned that CAD/CAM may become the main stream for implant component fabrication.

  2. Understanding dental CAD/CAM for restorations--accuracy from a mechanical engineering viewpoint.

    Science.gov (United States)

    Tapie, Laurent; Lebon, Nicolas; Mawussi, Bernardin; Fron-Chabouis, Hélène; Duret, Francois; Attal, Jean-Pierre

    2015-01-01

    As is the case in the field of medicine, as well as in most areas of daily life, digital technology is increasingly being introduced into dental practice. Computer-aided design/ computer-aided manufacturing (CAD/CAM) solutions are available not only for chairside practice but also for creating inlays, crowns, fixed partial dentures (FPDs), implant abutments, and other dental prostheses. CAD/CAM dental practice can be considered as the handling of devices and software processing for the almost automatic design and creation of dental restorations. However, dentists who want to use dental CAD/CAM systems often do not have enough information to understand the variations offered by such technology practice. Knowledge of the random and systematic errors in accuracy with CAD/CAM systems can help to achieve successful restorations with this technology, and help with the purchasing of a CAD/CAM system that meets the clinical needs of restoration. This article provides a mechanical engineering viewpoint of the accuracy of CAD/ CAM systems, to help dentists understand the impact of this technology on restoration accuracy.

  3. Understanding dental CAD/CAM for restorations--accuracy from a mechanical engineering viewpoint.

    Science.gov (United States)

    Tapie, Laurent; Lebon, Nicolas; Mawussi, Bernardin; Fron-Chabouis, Hélène; Duret, Francois; Attal, Jean-Pierre

    2015-01-01

    As is the case in the field of medicine, as well as in most areas of daily life, digital technology is increasingly being introduced into dental practice. Computer-aided design/ computer-aided manufacturing (CAD/CAM) solutions are available not only for chairside practice but also for creating inlays, crowns, fixed partial dentures (FPDs), implant abutments, and other dental prostheses. CAD/CAM dental practice can be considered as the handling of devices and software processing for the almost automatic design and creation of dental restorations. However, dentists who want to use dental CAD/CAM systems often do not have enough information to understand the variations offered by such technology practice. Knowledge of the random and systematic errors in accuracy with CAD/CAM systems can help to achieve successful restorations with this technology, and help with the purchasing of a CAD/CAM system that meets the clinical needs of restoration. This article provides a mechanical engineering viewpoint of the accuracy of CAD/ CAM systems, to help dentists understand the impact of this technology on restoration accuracy. PMID:26734668

  4. Computer Aided Aerodynamic Design of Missile Configuration

    OpenAIRE

    Panneerselvam, S; P. Theerthamalai; A.K. Sarkar

    1987-01-01

    Aerodynamic configurations of tactical missiles have to produce the required lateral force with minimum time lag to meet the required manoeuvability and response time. The present design which is mainly based on linearised potential flow involves (a) indentification of critical design points, (b) design of lifting components and their integration with mutual interference, (c) evaluation of aerodynamic characteristics, (d) checking its adequacy at otherpoints, (e) optimization of parameters an...

  5. CAD for LEP

    CERN Multimedia

    1983-01-01

    A work station of the Computer-Aided Design system which was installed in 1982 to aid in the mechanics design for LEP. Visible on the screen is a design made for a pick-up for LEP. See Annual Report 1982 p. 79, Fig. 2.

  6. Computer Program Aids Design Of Impeller Blades

    Science.gov (United States)

    Chen, Wei-Chung; Galazin, John V.

    1992-01-01

    Impeller blades for centrifugal turbopumps designed quickly with help of computer program. Generates blade contours and continually subjects them to evaluation. Checks physical parameters to ensure they are compatible with required performance and recycles design if criteria not met. Program written for centrifugal turbomachinery, also adapted to such axial pump components as inducer blades and stator vanes.

  7. Analog design and simulation using OrCAD capture and PSpice

    CERN Document Server

    Fitzpatrick, Dennis

    2012-01-01

    Anyone involved in circuit design that needs the practical know-how it takes to design a successful circuit or product, will find this practical guide to using Capture-PSpice (written by a former Cadence PSpice expert for Europe) an essential book. The text delivers step-by-step guidance on using Capture-PSpice to help professionals produce reliable, effective designs. Readers will learn how to get up and running quickly and efficiently with industry standard software and in sufficient detail to enable building upon personal experience to avoid common errors and pit-falls. This book is of great benefit to professional electronics design engineers, advanced amateur electronics designers, electronic engineering students and academic staff looking for a book with a real-world design outlook. This book provides both a comprehensive user guide, and a detailed overview of simulation; each chapter has worked and ready to try sample designs and provides a wide range of to-do exercises; core skills are developed using...

  8. OOADS:An Object—Oriented Design Model for Advertising CAD System

    Institute of Scientific and Technical Information of China (English)

    庄越挺; 潘云鹤; 等

    1996-01-01

    The advances of computer graphics and image processing have made it possible to design advertisements by computers.Presently,many commercial systems have come into being,such as CorelDraw and PhotoShop.All of them are developed out of the idea of graphics system or image system.For the ads designer,what is actually needed is a system developed from the point of view of ads design domain.In this paper,an object-oriented design model called OOADS is presented,around which five categories of operations,namely CMPDS(Clip/Modify/Paste/Draw/Select)are organized.Key approaches with the operations such as representation and organization of objects,virtual clipping,shadow images are demonstrated.In the end,the implementation of OOADS is discussed.

  9. Using AutoCAD to improve the visibility of the organizational technological design

    OpenAIRE

    Lebedeva Irina Mikhailovna

    2014-01-01

    The article describes the issue of increasing the visibility of technological solutions in organizational-technological design. The ability to visualize the main stages of building process technology contributes to organic integration of all the requirements. A special role for the harmonious perception is played by correct display of the lighting facilities, shadowing. Realistic shadows help to analyze the rooms’ insolation of the designed facility and the surrounding areas. We give a justif...

  10. Evaluation of biogeneric design techniques with CEREC CAD/CAM system

    OpenAIRE

    Arslan, Yeliz; Karakoca Nemli, Seçil; Bankoğlu Güngör, Merve; Tamam, Evşen; Yılmaz, Handan

    2015-01-01

    PURPOSE The aim of this study was to evaluate occlusal contacts generated by 3 different biogeneric design modes (individual (BI), copy (BC), reference (BR)) of CEREC software and to assess the designs subjectively. MATERIALS AND METHODS Ten pairs of maxillary and mandibular casts were obtained from full dentate individuals. Gypsum cast contacts were quantified with articulating paper and digital impressions were taken. Then, all ceramic crown preparation was performed on the left first molar...

  11. Space systems computer-aided design technology

    Science.gov (United States)

    Garrett, L. B.

    1984-01-01

    The interactive Design and Evaluation of Advanced Spacecraft (IDEAS) system is described, together with planned capability increases in the IDEAS system. The system's disciplines consist of interactive graphics and interactive computing. A single user at an interactive terminal can create, design, analyze, and conduct parametric studies of earth-orbiting satellites, which represents a timely and cost-effective method during the conceptual design phase where various missions and spacecraft options require evaluation. Spacecraft concepts evaluated include microwave radiometer satellites, communication satellite systems, solar-powered lasers, power platforms, and orbiting space stations.

  12. Mechatronical Aided Concept (MAC in Intelligent Transport Vehicles Design

    Directory of Open Access Journals (Sweden)

    Pavel Pavlasek

    2003-01-01

    Full Text Available This article deals with the principles of synergy effect of mechatronical aided concept (MAC to the design of intelligent transport vehicles products applying CA technologies and virtual reality design methods. Also includes presentation of intelligent railway vehicle development.

  13. Preparing for High Technology: CAD/CAM Programs. Research & Development Series No. 234.

    Science.gov (United States)

    Abram, Robert; And Others

    This guide is one of three developed to provide information and resources to assist in planning and developing postsecondary technican training programs in high technology areas. It is specifically intended for vocational-technical educators and planners in the initial stages of planning a specialized training option in computer-aided design (CAD)…

  14. Roots of Performance - Aided Design in Utzon´s design principles

    DEFF Research Database (Denmark)

    Parigi, Dario

    2014-01-01

    This paper discuss an emerging paradigm here identified as PAD, acronym of Performance-Aided Design, that aims at embracing complexity in the design process, and tackling it with digital tools. Computer Aided Design tools are gradually shifting from the mere translation of the work once carried o...

  15. A CAD investigation of metal-overhang on multiple guard ring design for high voltage operation of Si sensors

    Science.gov (United States)

    Bhardwaj, Ashutosh; Ranjan, Kirti; Namrata; Chatterji, Sudeep; Srivastava, Ajay K.; Shivpuri, R. K.

    2002-12-01

    The extension of Si detectors to the next generation high-energy physics experiments such as large hadron collider implies a reliable operation in high radiation environment which is by far the main technological challenge for these detectors. Multiple field limiting ring systems are well established as a means of protecting diffused junction from high voltage premature breakdown. Also, a spread of the Al metallization over the inter-cathodic field oxide sensibly lowers the electric field at the junction edges, thus, allowing for higher breakdown voltages. The purpose of this work is to combine the positive aspects of these two termination techniques with the aim of defining layouts and technological solutions suitable for the use of Si detectors in adverse radiation environment. An important feature is the potential distribution in the multi-guard ring structure, which depends on the bulk doping concentration, the oxide charge, the size of the gap between guard rings and the metal-overhang design. A systematic investigation on the breakdown performance is done by varying the physical and geometrical parameters such as width of overhang, guard ring spacing, junction depth and oxide charge. CAD tools are used for evaluating potential and electric field distributions within the device.

  16. CAD/CAM and new design technologies in high energy physics electronics applications

    International Nuclear Information System (INIS)

    In the past few years, several significant new technologies related to electronics design, fabrication and testing, appear to have reached a level of maturity which makes them ripe for exploitation by high energy physics laboratories. This paper reviews recent developments and trends, and draws particularly from some examples at Stanford Linear Accelerator Center. Cost benefits as well as difficulties of implementing new technologies into relatively small laboratories will be examined

  17. CAD/CAM and new design technologies in high energy physics electronics applications

    Energy Technology Data Exchange (ETDEWEB)

    Larsen, R.S.

    1984-10-01

    In the past few years, several significant new technologies related to electronics design, fabrication and testing, appear to have reached a level of maturity which makes them ripe for exploitation by high energy physics laboratories. This paper reviews recent developments and trends and draws particularly from some examples at Stanford Linear Accelerator Center. Cost benefits as well as difficulties of implementing new technologies into relatively small laboratories are examined. 3 references, 11 figures, 2 tables.

  18. CAD/CAM and new design technologies in high energy physics electronics applications

    International Nuclear Information System (INIS)

    In the past few years, several significant new technologies related to electronics design, fabrication and testing, appear to have reached a level of maturity which makes them ripe for exploitation by high energy physics laboratories. This paper reviews recent developments and trends and draws particularly from some examples at Stanford Linear Accelerator Center. Cost benefits as well as difficulties of implementing new technologies into relatively small laboratories are examined. 3 references, 11 figures, 2 tables

  19. CAD/CAM and new design technologies in high energy physics electronics applications

    Energy Technology Data Exchange (ETDEWEB)

    Larsen, R.S.

    1985-02-01

    In the past few years, several significant new technologies related to electronics design, fabrication and testing, appear to have reached a level of maturity which makes them ripe for exploitation by high energy physics laboratories. This paper reviews recent developments and trends, and draws particularly from some examples at Stanford Linear Accelerator Center. Cost benefits as well as difficulties of implementing new technologies into relatively small laboratories will be examined.

  20. COMPUTER-AIDED DESIGN OF EMBOSSING TAPS

    OpenAIRE

    Lyczko, Kazimierz; Legutko, Stanislaw; Słonina, Lukasz; Sercer, Mladen

    2014-01-01

    The paper presents the development of an algorithm for computing the sizes of embossing taps. There are defined: the area of the software program encompassing the types and range of threads (metric and unified of the UNC, UNF, UNEF and G types), the design of the working portion (the conical and curvilinear shape of the forming portion, the number of lobes) and the overall dimensions and the profile type (incomplete or complete) of the thread to be formed. The general description and operatio...

  1. Influence of different luting protocols on shear bond strength of computer aided design/computer aided manufacturing resin nanoceramic material to dentin

    Science.gov (United States)

    Poggio, Claudio; Pigozzo, Marco; Ceci, Matteo; Scribante, Andrea; Beltrami, Riccardo; Chiesa, Marco

    2016-01-01

    Background: The purpose of this study was to evaluate the influence of three different luting protocols on shear bond strength of computer aided design/computer aided manufacturing (CAD/CAM) resin nanoceramic (RNC) material to dentin. Materials and Methods: In this in vitro study, 30 disks were milled from RNC blocks (Lava Ultimate/3M ESPE) with CAD/CAM technology. The disks were subsequently cemented to the exposed dentin of 30 recently extracted bovine permanent mandibular incisors. The specimens were randomly assigned into 3 groups of 10 teeth each. In Group 1, disks were cemented using a total-etch protocol (Scotchbond™ Universal Etchant phosphoric acid + Scotchbond Universal Adhesive + RelyX™ Ultimate conventional resin cement); in Group 2, disks were cemented using a self-etch protocol (Scotchbond Universal Adhesive + RelyX™ Ultimate conventional resin cement); in Group 3, disks were cemented using a self-adhesive protocol (RelyX™ Unicem 2 Automix self-adhesive resin cement). All cemented specimens were placed in a universal testing machine (Instron Universal Testing Machine 3343) and submitted to a shear bond strength test to check the strength of adhesion between the two substrates, dentin, and RNC disks. Specimens were stressed at a crosshead speed of 1 mm/min. Data were analyzed with analysis of variance and post-hoc Tukey's test at a level of significance of 0.05. Results: Post-hoc Tukey testing showed that the highest shear strength values (P < 0.001) were reported in Group 2. The lowest data (P < 0.001) were recorded in Group 3. Conclusion: Within the limitations of this in vitro study, conventional resin cements (coupled with etch and rinse or self-etch adhesives) showed better shear strength values compared to self-adhesive resin cements. Furthermore, conventional resin cements used together with a self-etch adhesive reported the highest values of adhesion. PMID:27076822

  2. Evaluation of three-dimensional position change of the condylar head after orthognathic surgery using computer-aided design/computer-aided manufacturing-made condyle positioning jig.

    Science.gov (United States)

    Kim, Hyung-Mo; Baek, Seung-Hak; Kim, Tae-Yun; Choi, Jin-Young

    2014-11-01

    This study was performed to evaluate the efficacy of computer-aided design/computer-aided manufacturing (CAM/CAD)-made condyle positioning jig in orthognathic surgery. The sample consisted of 40 mandibular condyles of 20 patients with class III malocclusion who underwent bilateral sagittal split ramus osteotomy with semirigid fixation (6 men and 14 women; mean age, 25 y; mean amount of mandibular setback, 5.8 mm). Exclusion criteria were patients who needed surgical correction of the frontal ramal inclination and had signs and symptoms of the temporomandibular disorder before surgery. Three-dimensional computed tomograms were taken 1 month before the surgery (T1) and 1 day after the surgery (T2). The condylar position was evaluated at the T1 and T2 stages on the axial, frontal, and sagittal aspects in the three-dimensional coordinates. The linear change of the posterior border of the proximal segment of the ramus between T1 and T2 was also evaluated in 30 condyles (15 patients), with the exception of 10 condyles of 5 patients who received mandibular angle reduction surgery. There was no significant difference in the condylar position in the frontal and sagittal aspects (P > 0.05). Although there was a significant difference in the condylar position in the axial aspect (P < 0.01), the amount of difference was less than 1 mm and 1 degree; it can be considered clinically nonsignificant. In the linear change of the posterior border of the proximal segment of the ramus, the mean change was 1.4 mm and 60% of the samples showed a minimal change of less than 1 mm. The results of this study suggest that CAD/CAM-made condyle positioning jig is easy to install and reliable to use in orthognathic surgery.

  3. 三维CAD技术在机械设计中的应用探究%3D CAD technology application in the mechanical design research

    Institute of Scientific and Technical Information of China (English)

    史越

    2013-01-01

    在科技飞速发展的今天,各国都加大而来对机械制造业的发展,而三维CAD技术的出现给机械设计带来新的希望。论文通过对三维CAD技术的定义、优势的阐述,结合其在机械设计中的应用、优势、问题以及对机械设计产生的影响分析,得出三维CAD技术是促进机械设计不断发展进步的主要途径,具有重要的指导意义。%In today's rapid development of science and technology,countries are increasing and to the development of mechanical manufacturing,and the emergence of 3 d CAD technology to mechanical design brings new hope.Based on definition of 3 d CAD technology,advantages,combined with its application in mechanical design,advantages,problems and analysis of the impact of mechanical design,it is concluded that the three-dimensional CAD technology is a major way to promote the continuous development and progress of mechanical design, have important guiding significance.

  4. Computer-Aided Design Of Sheet-Material Parts

    Science.gov (United States)

    Gilbert, Jeffrey L.; Paternoster, Vincent Y.; Levitt, Maureen L.; Osterloh, Mark R.

    1991-01-01

    Computer-aided-design system partly automates tedious process of designing and guiding assembly of small pieces of flat sheet material into large surfaces that approximate smoothly curved surfaces having complicated three-dimensional shapes. Capability provides for flexibility enabling designer to assess quickly and easily effects of changes in design in making engineering compromises among various sizes and shapes. Saves time and money in both design and fabrication. Used in rocket-engine application and other applications requiring design of sheet-material parts.

  5. Surface Roughness and Microhardness of Two Recent CAD/CAM-Materials After Storage

    OpenAIRE

    Flury, Simon; Diebold, Elisabeth; Peutzfeldt, Anne; Lussi, Adrian

    2014-01-01

    Objectives: To investigate surface roughness and microhardness of two recent resin-ceramic materials for computer-aided design/computer-aided manufacturing (CAD/CAM) after polishing with three polishing systems. Surface roughness and microhardness were measured immediately after polishing and after six months storage including monthly artificial toothbrushing. Methods: Sixty specimens of Lava Ultimate (3M ESPE) and 60 specimens of VITA ENAMIC (VITA Zahnfabrik) were roughened in a standardi...

  6. CAD/CAM fabricated single-unit all-ceramic post–core–crown restoration

    OpenAIRE

    Thilla Sekar Vinothkumar; Deivanayagam Kandaswamy; Pallavi Chanana

    2011-01-01

    This case report explains about an innovative treatment strategy for the management of damaged anterior teeth with reduced incisal clearance by means of a single-unit all-ceramic post-core-crown zirconia ceramic restoration fabricated by Computer-aided designing and computer-aided manufacturing (CAD/CAM) technology. The reinforced zirconia ceramics allow fabrication of durable esthetic restorations in cases with high functional loading and the unification of the post, core, and crown in a sin...

  7. A 3-dimensional accuracy analysis of chairside CAD/CAM milling processes

    OpenAIRE

    Bosch, Gabriel; Ender, Andreas; Mehl, Albert

    2014-01-01

    STATEMENT OF PROBLEM Milling is a central and important aspect of computer-aided design and computer-aided manufacturing (CAD/CAM) technology. High milling accuracy reduces the time needed to adapt the workpiece and provides restorations with better longevity and esthetic appeal. The influence of different milling processes on the accuracy of milled restorations has not yet been reviewed. PURPOSE The purpose of this study was to investigate the influence of different milling processes on t...

  8. Learning Aids in Chemistry: Design and Development

    Directory of Open Access Journals (Sweden)

    TienTien Lee

    2012-09-01

    Full Text Available Electrochemistry is found to be a difficult topic to learn due to its abstract concepts that involve the macroscopic, microscopic and symbolic representation levels. Research showed that animation and simulation using Information and Communication Technology (ICT can help students to visualize and hence enhance students’ understanding in learning abstract chemistry topics. As a result, Interactive Multimedia Module with Pedagogical Agent (IMMPA named EC Lab was developed in order to assist students in the learning of the Electrochemistry topic. KemGerly Model (combination of Kemp Model, Gerlach and Ely Model were combined as instructional design models for the design of IMMPA EC Lab. Pedagogical Agents (PAs were added in IMMPA EC Lab to facilitate learning in computer-mediated learning environments. The information delivery and the flow of content follow the Needham phases in constructivism theory. It is hoped that the IMMPA EC Lab would be able to assist students in the learning of Electrochemistry in terms of concept understanding and motivation level.

  9. False positive reduction for lung nodule CAD

    Science.gov (United States)

    Zhao, Luyin; Boroczky, Lilla; Drysdale, Jeremy; Agnihotri, Lalitha; Lee, Michael C.

    2007-03-01

    Computer-aided detection (CAD) algorithms 'automatically' identify lung nodules on thoracic multi-slice CT scans (MSCT) thereby providing physicians with a computer-generated 'second opinion'. While CAD systems can achieve high sensitivity, their limited specificity has hindered clinical acceptance. To overcome this problem, we propose a false positive reduction (FPR) system based on image processing and machine learning to reduce the number of false positive lung nodules identified by CAD algorithms and thereby improve system specificity. To discriminate between true and false nodules, twenty-three 3D features were calculated from each candidate nodule's volume of interest (VOI). A genetic algorithm (GA) and support vector machine (SVM) were then used to select an optimal subset of features from this pool of candidate features. Using this feature subset, we trained an SVM classifier to eliminate as many false positives as possible while retaining all the true nodules. To overcome the imbalanced nature of typical datasets (significantly more false positives than true positives), an intelligent data selection algorithm was designed and integrated into the machine learning framework, thus further improving the FPR rate. Three independent datasets were used to train and validate the system. Using two datasets for training and the third for validation, we achieved a 59.4% FPR rate while removing one true nodule on the validation datasets. In a second experiment, 75% of the cases were randomly selected from each of the three datasets and the remaining cases were used for validation. A similar FPR rate and true positive retention rate was achieved. Additional experiments showed that the GA feature selection process integrated with the proposed data selection algorithm outperforms the one without it by 5%-10% FPR rate. The methods proposed can be also applied to other application areas, such as computer-aided diagnosis of lung nodules.

  10. Computer Aided Solvent Selection and Design Framework

    DEFF Research Database (Denmark)

    Mitrofanov, Igor; Conte, Elisa; Abildskov, Jens;

    Solvents are widely used as a reaction medium, as a reactant or as carrier at some stages of the manufacturing chain in products from the chemical, fine chemical, pharmaceutical, food, and agrochemical industries. Solvent are either required for processing after which they are removed...... is to develop a systematic framework and implement it as software for selection and design of solvents for many applications including organic synthesis, complex reaction systems and solvent-based separations. The solvent selection framework is based on a combination of knowledge from industrial practice...... for each reaction: 1. Problem identification. Finding an objective for given system, identifying actual functions of the solvent. 2. Search criteria definition. The solvent functions that satisfy the operational needs of the process are defined in terms of a set of search criteria (R-indices), defined...

  11. A method of computer aided design with self-generative models in NX Siemens environment

    Science.gov (United States)

    Grabowik, C.; Kalinowski, K.; Kempa, W.; Paprocka, I.

    2015-11-01

    Currently in CAD/CAE/CAM systems it is possible to create 3D design virtual models which are able to capture certain amount of knowledge. These models are especially useful in an automation of routine design tasks. These models are known as self-generative or auto generative and they can behave in an intelligent way. The main difference between the auto generative and fully parametric models consists in the auto generative models ability to self-organizing. In this case design model self-organizing means that aside from the possibility of making of automatic changes of model quantitative features these models possess knowledge how these changes should be made. Moreover they are able to change quality features according to specific knowledge. In spite of undoubted good points of self-generative models they are not so often used in design constructional process which is mainly caused by usually great complexity of these models. This complexity makes the process of self-generative time and labour consuming. It also needs a quite great investment outlays. The creation process of self-generative model consists of the three stages it is knowledge and information acquisition, model type selection and model implementation. In this paper methods of the computer aided design with self-generative models in NX Siemens CAD/CAE/CAM software are presented. There are the five methods of self-generative models preparation in NX with: parametric relations model, part families, GRIP language application, knowledge fusion and OPEN API mechanism. In the paper examples of each type of the self-generative model are presented. These methods make the constructional design process much faster. It is suggested to prepare this kind of self-generative models when there is a need of design variants creation. The conducted research on assessing the usefulness of elaborated models showed that they are highly recommended in case of routine tasks automation. But it is still difficult to distinguish

  12. Bilgisayar destekli diş hekimliği ve güncel CAD/CAM sistemleri

    Directory of Open Access Journals (Sweden)

    Gözde Çelik

    2013-01-01

    Full Text Available

    CAD/CAM systems (computer aided design/computer aided manufacturing has been used in dentistry since 1987. In the past 25 years, development of various high quality chairside and laboratory CAD/CAM systems has been continued with the progress of technology. This article describes currently used CAD/CAM systems.

    Keywords: Dental, CAD/CAM systems.

     

    ÖZET

    CAD/CAM sistemleri (bilgisayar destekli tasarım/bilgisayar destekli üretim diş hekimliğinde 1987 yılından beri kullanılmaktadır. Son 25 yılda teknolojinin de ilerlemesiyle üstün özellikte çeşitli klinik ve laboratuvar CAD/CAM sistemleri geliştirilmeye devam etmektedir. Bu makalede günümüzde kullanılan CAD/CAM sistemleri anlatılmaktadır.

  13. Information technology aided exploration of system design spaces

    Science.gov (United States)

    Feather, Martin S.; Kiper, James D.; Kalafat, Selcuk

    2004-01-01

    We report on a practical application of information technology techniques to aid system engineers effectively explore large design spaces. We make use of heuristic search, visualization and data mining, the combination of which we have implemented wtihin a risk management tool in use at JPL and NASA.

  14. Mechanism design process CAD based on Information processing%基于信息加工的机构设计过程CAD

    Institute of Scientific and Technical Information of China (English)

    张晓钟; 杨哲; 董丽丽; 万晓鸽

    2011-01-01

    Based on the analysis of the existing mechanical design methods and the information processing views, the representation forms, evolution and information processing under the thinking brain during the mechanical design process and at different stages were studied.And based on the computer's working principle, the characteristics of handling text message and graphic information, it was proposed to complete entire mechanical design activities in the computer through the integration of text processing, textgraphics conversion, graphics processing by using data mining, feature extraction, feature dimension reduction, the gray relational degree algorithm, parametric technology, secondary benchmark based assembly technology and secondary development technologies and etc.By taking the link mechanism design as an example, the computerized, intelligent, automated design process was achieved in man-machine interactive environment.%文中在分析现有机构设计方法的基础上,依据信息加工观,研究了机构设计过程及各阶段在大脑思维下的表征形式、演变及信息处理过程,再依据计算机的工作原理、处理文本信息与图形信息的特点,提出利用数据挖掘、特征提取、特征降维、灰色关联度算法、参数化技术、基于辅助基准的装配技术、二次开发技术等在计算机上实现文本处理、文本一图形转换、图形处理等过程的一体化来完成整个机构设计活动.以连杆机构设计为例,实现了在人机交互环境下计算机化、智能化、自动化的设计过程.

  15. Computer Aided Design System for Developing Musical Fountain Programs

    Institute of Scientific and Technical Information of China (English)

    刘丹; 张乃尧; 朱汉城

    2003-01-01

    A computer aided design system for developing musical fountain programs was developed with multiple functions such as intelligent design, 3-D animation, manual modification and synchronized motion to make the development process more efficient. The system first analyzed the music form and sentiment using many basic features of the music to select a basic fountain program. Then, this program is simulated with 3-D animation and modified manually to achieve the desired results. Finally, the program is transformed to a computer control program to control the musical fountain in time with the music. A prototype system for the musical fountain was also developed. It was tested with many styles of music and users were quite satisfied with its performance. By integrating various functions, the proposed computer aided design system for developing musical fountain programs greatly simplified the design of the musical fountain programs.

  16. Evaluation of the effect of zirconia all-ceramic fixed dental prostheses designed and manufactured by CAD/CAM in restoration of posterior teeth%CAD/CAM二氧化锆全瓷固定桥的修复效果评价

    Institute of Scientific and Technical Information of China (English)

    宓勇

    2015-01-01

    To observe the 36 months follow-up outcome of zirconia all-ceramic posterior fixed dental prostheses(FDPs)designed and manu-factured by computer aided design and computer aided manufacture (CAD /CAM)from clinical aspect,and to evaluate the success rate of zirconia framework and veneering porcelain.78 patients with less than three teeth lost which had natural opposing teeth were included.A to-tal of ninty-two zirconia all-ceramic FDPs (59 three-unit FDPs,20 four-unit FDPs and 13 five-unit FDPs)were made by CAD /CAM.Three years after cementation of the restorations,the reasons for complication and failure of FDPs in different lengths were analysed.Six FDPs were removed (frame fracture:1;porcelain fracture:1;secondary caries:2;vertical root fractures and post-core fracture after root canal therapy of premolars:2).The success rate of these FDPs was 93.5%.The success rate of zirconia all-ceramic crowns and bridges was higher.Their clinical effect was satisfactory.The main complications of these FDPs were porcelain fracture and de-bonding.%选择78名口内最多缺失2颗牙且存在对颌牙用 CAD/CAM氧化锆固定桥修复的患者,制作92件固定桥:3单位桥59件,4单位桥20件,5单位桥13件。在修复体粘接后,随访3年,分析不同长度的全瓷桥并发症的发生和失败原因的差异。6件固定桥需要拆除,修复成功率93.5%;1例因支架断裂拆除,1例由于崩瓷面积较大而拆除,2例因继发龋脱落而不能重新粘接,另外 2例前磨牙根管治疗后牙根纵裂和核折断导致修复失败。二氧化锆全瓷冠桥具有较高的成功率,临床效果满意,主要并发症是崩瓷和脱粘接。

  17. CAD/CAE-based Electric Bike Trunk Injection Mold Design%基于CAD/CAE的电动自行车后备箱注射模具设计

    Institute of Scientific and Technical Information of China (English)

    王晓梅; 程晓宇

    2012-01-01

    通过对电动自行车后备箱的工艺分析,介绍了后备箱的模具结构特点和设计途径,分析了成型零件设计的要点和对曲面表面质量要求较高的浇注系统设计的要点,给出了基于MOLDFLOW模流分析报告,通过应用模具CAD/模具CAE正确设计,保证了产品质量.%Through the process analysis on the electric bicycle trunk, the mold structure characteristics and design approach of the trunk is presented, the main points of the molded part design and gating system design requirements of a higher quality of curved surface are analyzed, and based on the MOLDFLOW mode flow analysis reports are given to ensure product quality through proper design of the mold GAD/die CAE.

  18. Integrating conventional and CAD/CAM digital techniques for establishing canine protected articulation: A clinical report.

    Science.gov (United States)

    El Kerdani, Tarek; Nimmo, Arthur

    2016-05-01

    Canine protected articulation is widely accepted for patients requiring extensive oral rehabilitation. Computer-aided design and computer-aided manufacturing (CAD/CAM) restorations have been primarily designed in occlusion at the maximum intercuspal position. Designing a virtual articulator that is capable of accepting excursive occlusal records and duplicating the mandibular movements is a challenge for CAD/CAM technology. Modifying tooth shape using composite resin trial restorations to produce esthetic results and later scanning the modified teeth to create milled crowns is becoming a popular use of the CAD/CAM technology. This report describes a technique that combines conventional and CAD/CAM prosthodontic techniques for milling crowns for canine teeth that are designed to establish or improve canine protected articulation. This technique involves designing and fabricating interim restorations based on diagnostic waxing, scanning the designs intraorally, and storing them in software as pretreatment digital records. The scanned designs are then applied to the digital representation of the prepared teeth to fabricate the definitive restorations. PMID:26774319

  19. Design and fabrication of uncemented femoral prosthesis using CAD/CAM/Robotic integration method%CAD/CAM/Robotic集成方法设计与制作生物型股骨柄假体

    Institute of Scientific and Technical Information of China (English)

    韩文龙; 朱建非; 吴琪; 刘昌华; 王爱民; 席文明

    2014-01-01

    BACKGROUND:In total hip replacements, aseptic loosening of uncemented femoral hip prosthesis is the main reason for the failure of artificial hip replacement, the prerequisite of reducing aseptic loosening of prosthesis is to increase fil ing area of femoral prosthesis in femoral cavity. OBJECTIVE:To obtain the fil ing rate of customized femoral prosthesis in femoral cavity and verify the validity of the methods of CAD/CAM/Robotic integration and the robot grind. METHODIn this paper, the CT data of femur were used to reconstruct three-dimensional model of femoral cavity. According to this model, a custom uncemented femoral hip prosthesis was designed, then the model of this custom prosthesis was imported into the CAD/CAM/Robotic software to generate cut path. After the cut path was imported into the robotic control er, the custom prosthesis can be fabricated, then this custom prosthesis was inserted into the femoral cavity, and the fil ing result of the custom prosthesis in femoral cavity was analyzed. RESULTS AND CONCLUSION:The experiment results showed that the customized prosthesis in femoral cavity achieved good fil ing result, the structure of femoral cavity resisted the rotation of the customized prosthesis in femoral cavity, and the customized prosthesis obtained stable fixation in the femoral cavity.%背景:生物型股骨柄假体无菌松动是全髋关节置换失败的主要因素,减少无菌松动的先决条件是增加股骨柄假体在股骨髓腔中的填充率。  目的:得到定制式股骨柄假体在髓腔中的填充率,验证计算机辅助设计/计算机辅助制造/工业机器人加工(CAD/CAM/Robotic)集成方法和机器人磨削的有效性。  方法:利用 CT 数据重建股骨髓腔三维模型,在此三维模型基础上设计股骨柄假体的柄体,依据标准直柄股骨柄假体近端模型设计股骨柄假体的其余部分。将设计的股骨柄假体模型导入CAD/CAM/Robotic集成系统生成机

  20. 浅谈CAD技术完善室内设计的操作指南与操作技巧%Operation Instruction and Operative Skills of CAD Technology for Optimizing Interior Design

    Institute of Scientific and Technical Information of China (English)

    侯婕

    2015-01-01

    The author compactly sums up the research on CAD software and combines with the experience of interior design by CAD to analyze the main operation instruction and related operative skills of building interior design by using the CAD software and deepen the understanding of CAD software of designers.%作者精要总结自身对CAD软件的研究,同时联系参与CAD室内设计的经历,分析利用CAD软件为建筑室内进行设计的主要操作技术与相关技巧,深化设计师们对CAD软件的认识。

  1. Technology computer aided design simulation for VLSI MOSFET

    CERN Document Server

    Sarkar, Chandan Kumar

    2013-01-01

    Responding to recent developments and a growing VLSI circuit manufacturing market, Technology Computer Aided Design: Simulation for VLSI MOSFET examines advanced MOSFET processes and devices through TCAD numerical simulations. The book provides a balanced summary of TCAD and MOSFET basic concepts, equations, physics, and new technologies related to TCAD and MOSFET. A firm grasp of these concepts allows for the design of better models, thus streamlining the design process, saving time and money. This book places emphasis on the importance of modeling and simulations of VLSI MOS transistors and

  2. Off-line programming: key to CAD/CAM (robots)

    Energy Technology Data Exchange (ETDEWEB)

    Durham, T.

    1983-06-23

    Off-line programming is essential if robots are to be fully integrated into the computer-aided design/computer-aided manufacturing (CAD/CAM) process. It is also fundamental to the use of robots with touch and vision sensors, since the movements of such a robot depend on real-world data and cannot be taught in advance. Edinburgh (UK) University's Department of Artificial Intelligence is developing a high-level language called Rapt, for the programming of assembly robots. Rapt is described as an object-level language. Its statements refer to material objects and their physical relationships and motions. It uses higher level descriptions than those of commercially available robot languages such as unimation's val. The developments in off-line programming which are crucial to the successful integration of industrial robots into computer-aided design and manufacturing processes are discussed.

  3. Discrete Dipole Approximation Aided Design Method for Nanostructure Arrays

    Institute of Scientific and Technical Information of China (English)

    ZHU Shao-Li; LUO Xian-Gang; DU Chun-Lei

    2007-01-01

    A discrete dipole approximation (DDA) aided design method is proposed to determine the parameters of nanostructure arrays. The relationship between the thickness, period and extinction efficiency of nanostructure arrays for the given shape can be calculated using the DDA. Based on the calculated curves, the main parameters of the nanostructure arrays such as thickness and period can be determined. Using this aided method, a rhombic sliver nanostructure array is designed with the determinant parameters of thickness (40 nm) and period (440 nm).We further fabricate the rhombic sliver nanostructure arrays and testify the character of the extinction spectra.The obtained extinction spectra is within the visible range and the full width at half maximum is 99nm, as is expected.

  4. Computer-aided conceptual design of Air Cushion Vehicles

    Science.gov (United States)

    Band, E. G. U.; Lavis, D. R.

    This paper describes the development and use of a computer-aided design tool which has been used to explore preferred options for amphibious Air-Cushion Vehicle (ACV) and Surface-Effect Ship (SES) designs in support of U.S. Navy and U.S. Army programs. The tool, referred to as the ACV Design Synthesis Model (ADSM), is an interactive computer program which provides a description of feasible ACV or SES concepts that could be developed, by a competent design team, to perform the mission described by the input parameters. The paper discusses how the program was used to explore parametrically the design of a range of self-propelled hoverbarges to meet requirements of the U.S. Army Logistics Over the Shore (LOTS) phases of an amphibious landing. Examples of results are presented to illustrate the method used in determining design and performance trade-offs.

  5. The Computer Aided Integrated Design and Analysis of Oil Tank in Vehicle

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    This paper creates 3D solid model and assembly of U RJ 92-6 oil tank and analyses its strength by integrated CAD/CAE/CAM software I-D EAS. Through integrated simulation in computer, design efficiency and quality of oil tank is greatly improved. Adopting integrated CAD/CAE/CAM software to carry out integrated research to equ ipment and products, we will be able to take overall analysis in aspects of 3-D solid modeling, pre-assembly and strength, etc., to realize non-paper designi ng and parallel designing...

  6. Protein: CAD [Trypanosomes Database

    Lifescience Database Archive (English)

    Full Text Available CAD carbamoyl-phosphate synthetase 2, aspartate transcarbamylase, and dihydroorotaseCA...D trifunctional proteincarbamoylphosphate synthetase 2/aspartate transcarbamylase/dihydroorotasemultifunctional protein CA...D H.sapiens 47458828 18105007 790 P27708 CAD_(gene) 2.1.3.2|3.5.2.3|6.3.5.5 114010 2p22-p21 hsa00250|hsa00240 ...

  7. AutoCAD

    DEFF Research Database (Denmark)

    Jensen, Henrik

    1998-01-01

    I 1998 var AutoCAD Arkitektskolens basale CAD-tilbud til de studerende. Kursets vægt ligger på konstruktion og strukturering af 3d-modeller og med udgangspunkt i dette, 2d-tegning. Kurset er opbygget over CAD Clasic skabelonen (se min forskning). Kompendiet kan bruges til selvstudium....

  8. AutoCAD的三维设计技术研究%3D design in AutoCAD

    Institute of Scientific and Technical Information of China (English)

    吴春燕; 陈兵

    2005-01-01

    通过对在 AutoCAD中进行三维图形设计工作示控制、建模、编辑、着色和渲染的介绍,展示了 AutoCAD 2002版本中增强的三维绘图功能,为众多的 AutoCAD用户提供了一种三维设计的思路.

  9. Bendix CAD-CAM site plan

    Energy Technology Data Exchange (ETDEWEB)

    Smith, M.L.

    1982-12-01

    The Bendix Site Plan for CAD-CAM encompasses the development and integration of interactive graphics systems, factory data management systems, robotics, direct numerical control, automated inspection, factory automation, and shared data bases to achieve significant plant-wide gains in productivity. This plan does not address all current or planned computerization projects within our facility. A summary of planning proposals and rationale is presented in the following paragraphs. Interactive Graphics System (IGS) capability presently consists of two Applicon CAD systems and the CD-2000 software program processing on a time-shared CYBER 174 computer and a dedicated CYBER 173. Proposed plans include phased procurment through FY85 of additional computers and sufficient graphics terminals to support projected needs in drafting, tool/gage design, N/C programming, and process engineering. Planned procurement of additional computer equipment in FY86 and FY87 will provide the capacity necessary for a comprehensive graphics data base management system, computer-aided process planning graphics, and special graphics requirements in facilities and test equipment design. The overall IGS plan, designated BICAM (Bendix Integrated Computer Aided Manufacturing), will provide the capability and capacity to integrate manufacturing activities through a shared product data base and standardized data exchange format. Planned efforts in robotics will result in productive applications of low to medium technology robots beginning in FY82, and extending by FY85 to work cell capabilities utilizing higher technology robots with sensors such as vision and instrumented remote compliance devices. A number of robots are projected to be in service by 1990.

  10. Tooth-colored CAD/CAM monolithic restorations.

    Science.gov (United States)

    Reich, S

    2015-01-01

    A monolithic restoration (also known as a full contour restoration) is one that is manufactured from a single material for the fully anatomic replacement of lost tooth structure. Additional staining (followed by glaze firing if ceramic materials are used) may be performed to enhance the appearance of the restoration. For decades, monolithic restoration has been the standard for inlay and partial crown restorations manufactured by both pressing and computer-aided design and manufacturing (CAD/CAM) techniques. A limited selection of monolithic materials is now available for dental crown and bridge restorations. The IDS (2015) provided an opportunity to learn about and evaluate current trends in this field. In addition to new developments, established materials are also mentioned in this article to complete the picture. In line with the strategic focus of the IJCD, the focus here is naturally on CAD/CAM materials. PMID:26110926

  11. Integrating reliability analysis and design

    International Nuclear Information System (INIS)

    This report describes the Interactive Reliability Analysis Project and demonstrates the advantages of using computer-aided design systems (CADS) in reliability analysis. Common cause failure problems require presentations of systems, analysis of fault trees, and evaluation of solutions to these. Results have to be communicated between the reliability analyst and the system designer. Using a computer-aided design system saves time and money in the analysis of design. Computer-aided design systems lend themselves to cable routing, valve and switch lists, pipe routing, and other component studies. At EG and G Idaho, Inc., the Applicon CADS is being applied to the study of water reactor safety systems

  12. Mammogram CAD, hybrid registration and iconic analysis

    Science.gov (United States)

    Boucher, A.; Cloppet, F.; Vincent, N.

    2013-03-01

    This paper aims to develop a computer aided diagnosis (CAD) based on a two-step methodology to register and analyze pairs of temporal mammograms. The concept of "medical file", including all the previous medical information on a patient, enables joint analysis of different acquisitions taken at different times, and the detection of significant modifications. The developed registration method aims to superimpose at best the different anatomical structures of the breast. The registration is designed in order to get rid of deformation undergone by the acquisition process while preserving those due to breast changes indicative of malignancy. In order to reach this goal, a referent image is computed from control points based on anatomical features that are extracted automatically. Then the second image of the couple is realigned on the referent image, using a coarse-to-fine approach according to expert knowledge that allows both rigid and non-rigid transforms. The joint analysis detects the evolution between two images representing the same scene. In order to achieve this, it is important to know the registration error limits in order to adapt the observation scale. The approach used in this paper is based on an image sparse representation. Decomposed in regular patterns, the images are analyzed under a new angle. The evolution detection problem has many practical applications, especially in medical images. The CAD is evaluated using recall and precision of differences in mammograms.

  13. Design of casting blanks in CAPP system for parts of piston-cylinder assembly of internal combustion engines

    OpenAIRE

    Todić, V.; J. Tepić; Milošević, M.; D. Lukić; Hadžistević, M.

    2012-01-01

    Development of information technology industry provided great possibilities in the area of integration of diff erent CAx systems, such as CAD, CAM, CAE and others. In order to successfully link systems of automated-design (or Computer Aided Design - CAD) with automated manufacturing systems (or Computer Aided Manufacturing – CAM), automation of manufacturing process planning is needed, i.e. CAPP (Computer-Aided Process Planning) systems can bridge a gap between design and manufacturing. In th...

  14. Different CAD/CAM-processing routes for zirconia restorations: influence on fitting accuracy.

    Science.gov (United States)

    Kohorst, Philipp; Junghanns, Janet; Dittmer, Marc P; Borchers, Lothar; Stiesch, Meike

    2011-08-01

    The aim of the present in vitro study was to evaluate the influence of different processing routes on the fitting accuracy of four-unit zirconia fixed dental prostheses (FDPs) fabricated by computer-aided design/computer-aided manufacturing (CAD/CAM). Three groups of zirconia frameworks with ten specimens each were fabricated. Frameworks of one group (CerconCAM) were produced by means of a laboratory CAM-only system. The other frameworks were made with different CAD/CAM systems; on the one hand by in-laboratory production (CerconCAD/CAM) and on the other hand by centralized production in a milling center (Compartis) after forwarding geometrical data. Frameworks were then veneered with the recommended ceramics, and marginal accuracy was determined using a replica technique. Horizontal marginal discrepancy, vertical marginal discrepancy, absolute marginal discrepancy, and marginal gap were evaluated. Statistical analyses were performed by one-way analysis of variance (ANOVA), with the level of significance chosen at 0.05. Mean horizontal discrepancies ranged between 22 μm (CerconCAM) and 58 μm (Compartis), vertical discrepancies ranged between 63 μm (CerconCAD/CAM) and 162 μm (CerconCAM), and absolute marginal discrepancies ranged between 94 μm (CerconCAD/CAM) and 181 μm (CerconCAM). The marginal gap varied between 72 μm (CerconCAD/CAM) and 112 μm (CerconCAM, Compartis). Statistical analysis revealed that, with all measurements, the marginal accuracy of the zirconia FDPs was significantly influenced by the processing route used (p < 0.05). Within the limitations of this study, all restorations showed a clinically acceptable marginal accuracy; however, the results suggest that the CAD/CAM systems are more precise than the CAM-only system for the manufacture of four-unit FDPs. PMID:20495937

  15. From Artisanal to CAD-CAM Blocks: State of the Art of Indirect Composites.

    Science.gov (United States)

    Mainjot, A K; Dupont, N M; Oudkerk, J C; Dewael, T Y; Sadoun, M J

    2016-05-01

    Indirect composites have been undergoing an impressive evolution over the last few years. Specifically, recent developments in computer-aided design-computer-aided manufacturing (CAD-CAM) blocks have been associated with new polymerization modes, innovative microstructures, and different compositions. All these recent breakthroughs have introduced important gaps among the properties of the different materials. This critical state-of-the-art review analyzes the strengths and weaknesses of the different varieties of CAD-CAM composite materials, especially as compared with direct and artisanal indirect composites. Indeed, new polymerization modes used for CAD-CAM blocks-especially high temperature (HT) and, most of all, high temperature-high pressure (HT-HP)-are shown to significantly increase the degree of conversion in comparison with light-cured composites. Industrial processes also allow for the augmentation of the filler content and for the realization of more homogeneous structures with fewer flaws. In addition, due to their increased degree of conversion and their different monomer composition, some CAD-CAM blocks are more advantageous in terms of toxicity and monomer release. Finally, materials with a polymer-infiltrated ceramic network (PICN) microstructure exhibit higher flexural strength and a more favorable elasticity modulus than materials with a dispersed filler microstructure. Consequently, some high-performance composite CAD-CAM blocks-particularly experimental PICNs-can now rival glass-ceramics, such as lithium-disilicate glass-ceramics, for use as bonded partial restorations and crowns on natural teeth and implants. Being able to be manufactured in very low thicknesses, they offer the possibility of developing innovative minimally invasive treatment strategies, such as "no prep" treatment of worn dentition. Current issues are related to the study of bonding and wear properties of the different varieties of CAD-CAM composites. There is also a crucial

  16. Implementation of a tolerance model in a computer aided design and inspection system

    Directory of Open Access Journals (Sweden)

    R. Hunter

    2006-04-01

    Full Text Available Purpose: Purpose of this paper is present a detailed framework to integrate the Computer Aided Design (CAD and Inspection (CAI systems through the integration of the Geometric Dimensioning and Tolerancing (GD&T with the inspection process in coordinate measuring machines (CMMs.Design/methodology/approach: The approach used to develop a prototype of a Knowledge Based System (KBS applied to inspection process establishes a new methodology for integrate the geometric dimensioning and tolerancing (GD&T. The integration is achieved through the definition of the knowledge units for functional properties of GD&T, inspection resources and inspection operations in a common knowledge model. The manufacturing and processing applications are the main topics approach of this paper.Findings: The findings are focused in modeling the features and interactions between knowledge units associated to topology, geometry and tolerances with the inspection process activities. The implementation of the product knowledge model is presented in a computer platform that extracts and represents the GD&T information in a CAI system.Research limitations/implications: The implications are focused on the automation of the inspection process in a KBS application. The future research is focused on the use of artificial intelligent technique, such as genetic algorithms and neural networks, to optimize the time to execute the inspection process.Practical implications: The main outcomes and implication of the KBS prototype application are focused on the reduction of the time spend to develop the inspection process. This KBS application provides the needed information to elaborate this process without the human interface.Originality/value: The original value of this paper is the integration of the design and inspection specification in a unique prototype application. The knowledge model has been defined in a common modeling language (UML and can be implemented in different

  17. The Effect of Preparation Design on the Fracture Resistance of Zir-Conia Crown Copings (Computer Associated Design/Computer Associated Machine, CAD/CAM System

    Directory of Open Access Journals (Sweden)

    B. Atashkar

    2011-09-01

    Full Text Available Objective: One of the major problems of all ceramic restorations is their probable fracture against the occlusal force. The aim of the present in-vitro study is was to compare the effect of two marginal designs (chamfer & shoulder on the fracture resistance of zirconia copings, CERCON (CAD/CAM.MATERIALS AND METHODS: This in vitro study was done with single blind experimental technique. One stainless steel dye with 50’ chamfer finish line design (0.8 mm depth was prepared using milling machine. Ten epoxy resin dyes were made, The same dye was retrieved and 50' chamfer was converted into shoulder (1 mm.again ten epoxy resin dyes were made from shoulder dyes. Zirconia cores with 0.4 mm thickness and 35 µm cement Space fabricated on the20 epoxy resin dyes (10 samples chamfer and 10 samples shoulder in a dental laboratory. Then the zirconia cores were cemented on the epoxy resin dyes and underwent a fracture test with a universal testing machine (GOTECH AI-700LAC, Arson, USA and samples were investigated from the point of view of the origin of the failure.RESULT: The mean value of fracture resistance for shoulder margins were 788.90±99.56 N and for the chamfer margins were 991.75±112.00 N. The student’s T-test revealed a statistically significant difference between groups (P=0.001.CONCLUSION: The result of this study indicates that marginal design of the zirconia cores effects on their fracture resistance. A chamfer margin could improve the biomechanical performance of posterior single zirconia crown restorations. This may be because of strong unity and round internal angle in chamfer margin.

  18. The Effect of Preparation Design on the Fracture Resistance of Zirconia Crown Copings (Computer Associated Design/Computer Associated Machine, CAD/CAM System)

    Science.gov (United States)

    Jalalian, E.; Atashkar, B.; Rostami, R.

    2011-01-01

    Objective One of the major problems of all ceramic restorations is their probable fracture against the occlusal force. The aim of the present in-vitro study is was to compare the effect of two marginal designs (chamfer & shoulder) on the fracture resistance of zirconia copings, CERCON (CAD/CAM). MATERIALS AND METHODS This in vitro study was done with single blind experimental technique. One stainless steel dye with 50′ chamfer finish line design (0.8 mm depth) was prepared using milling machine. Ten epoxy resin dyes were made, The same dye was retrieved and 50′ chamfer was converted into shoulder (1 mm).again ten epoxy resin dyes were made from shoulder dyes. Zirconia cores with 0.4 mm thickness and 35 μm cement Space fabricated on the 20 epoxy resin dyes (10 samples chamfer and 10 samples shoulder) in a dental laboratory. Then the zirconia cores were cemented on the epoxy resin dyes and underwent a fracture test with a universal testing machine (GOTECH AI-700LAC, Arson, USA) and samples were investigated from the point of view of the origin of the failure. RESULT The mean value of fracture resistance for shoulder margins were 788.90±99.56 N and for the chamfer margins were 991.75±112.00 N. The student’s T-test revealed a statistically significant difference between groups (P=0.001). CONCLUSION The result of this study indicates that marginal design of the zirconia cores effects on their fracture resistance. A chamfer margin could improve the biomechanical performance of posterior single zirconia crown restorations. This may be because of strong unity and round internal angle in chamfer margin. PMID:22457839

  19. Reconstruction of a maxillary defect with a fibula graft and titanium mesh using CAD/CAM techniques.

    Directory of Open Access Journals (Sweden)

    Poort Lucas J

    2010-07-01

    Full Text Available Abstract We present a case of maxillary and orbital floor reconstruction with a microvascular fibula graft and an individualized titanium mesh. Both were planned virtually; templates were made by rapid prototyping. The postoperative computertomography scans showed that the planned positions were achieved correctly. This case report illustrates maxillary reconstruction performed with a special template technique and demonstrates the possibilities of computer aided design/computer aided manufacturing (CAD/CAM applications in reconstructive surgery.

  20. Reconstruction of a maxillary defect with a fibula graft and titanium mesh using CAD/CAM techniques.

    Science.gov (United States)

    2010-01-01

    We present a case of maxillary and orbital floor reconstruction with a microvascular fibula graft and an individualized titanium mesh. Both were planned virtually; templates were made by rapid prototyping. The postoperative computertomography scans showed that the planned positions were achieved correctly. This case report illustrates maxillary reconstruction performed with a special template technique and demonstrates the possibilities of computer aided design/computer aided manufacturing (CAD/CAM) applications in reconstructive surgery. PMID:20642821

  1. Dentinhaftkraft zweier neuer CAD/CAM-Materialien in Abhängigkeit verschiedener adhäsiver Zementsysteme

    OpenAIRE

    Schmidt, Stefanie Zita

    2015-01-01

    Zielsetzung: Ziel der Studie war die Bestimmung der Dentinhaftkraft von zwei so-genannten Hybridmaterialien für computer-aided design/computer-aided manufacturing (CAD/CAM) Restaurationen unter Anwendung von fünf verschiedenen Zementen vor und nach sechsmonatiger Lagerung. Materialien und Methoden: Aus extrahierten menschlichen Molaren wurden 300 Dentinprobekörper hergestellt (n=15 pro Gruppe; 10 Gruppen (2 Hybridkeramiken, 5 Zemente) je nach 24 h/nach sechsmonatiger Lagerung). Aus Hybridk...

  2. Single-tooth dento-osseous osteotomy with a computer-aided design/computer-aided manufacturing surgical guide

    Science.gov (United States)

    2016-01-01

    This clinical note introduces a method to assist surgeons in performing single-tooth dento-osseous osteotomy. For use in this method, a surgical guide was manufactured using computer-aided design/computer-aided manufacturing technology and was based on preoperative surgical simulation data. This method was highly conducive to successful single-tooth dento-osseous segmental osteotomy. PMID:27162756

  3. A Design of a Computer-Aided Diagnostic Tool For Chest X-Ray Analysis

    Directory of Open Access Journals (Sweden)

    Kim Le

    2011-04-01

    Full Text Available Diagnosis of some chest diseases like heart failure, lung cancer or lung tuberculosis, etc. isoften based on chest X-ray images (CXR. The diseases are curable if they are detected in theirearly stages. Examining CXR is a time consuming process. In some cases, medical experts hadoverlooked the diseases in their firstexaminations on CXR, and when the images were reexamined,the disease signs could be detected.Furthermore, the number of CXR to examine isnumerous and far beyond the capability of available medical staff, especially in developingcountries.A computer-aided diagnosis (CAD system can mark suspected areas on CXR for carefulexamination by medical doctors, and can give alarm in the cases that need urgent attention.This paper reports our continuous work on the development of a CAD tool, which is anextended version of a conference paper [1]. In this version, we present some more works onCXR analysis and examination.

  4. Computer aided design around the A300 Airbus

    CERN Document Server

    Audy, J J

    1982-01-01

    More than thirteen years after the launching of the first AIRBUS development a survey of CAD/CAM introduction and operation at AEROSPATIALE, Aircraft Division was conducted. The results of this survey are described. Initially, a short description of AEROSPATIALE Aircraft Division is given and the state of CAD/CAM expertise in the factory before the Airbus project is outlined. Next, the author describes the implementation of CAE in the structural, aerodynamic and electrical fields in response to the growing success of the various Airbus programs and in front of an everyday tougher competition. After a description of the present situation and a first estimate of CAE benefits, special attention is devoted to the difficulties encountered with both hardware and software used in the systems involved. To conclude the author defines the respective roles of the system buyer and vendor in the CAD/CAM field.

  5. Strategies for the Curation of CAD Engineering Models

    Directory of Open Access Journals (Sweden)

    Manjula Patel

    2009-06-01

    Full Text Available Normal 0 Product Lifecycle Management (PLM has become increasingly important in the engineering community over the last decade or so, due to the globalisation of markets and the rising popularity of products provided as services. It demands the efficient capture, representation, organisation, retrieval and reuse of product data over its entire life. Simultaneously, there is now a much greater reliance on CAD models for communicating designs to manufacturers, builders, maintenance crews and regulators, and for definitively expressing designs. Creating the engineering record digitally, however, presents problems not only for its long-term maintenance and accessibility - due in part to the rapid obsolescence of the hardware, software and file formats involved - but also for recording the evolution of designs, artefacts and products. We examine the curation and preservation requirements in PLM and suggest ways of alleviating the problems of sustaining CAD engineering models through the use of lightweight formats, layered annotation and the collection of Representation Information as defined in the Open Archival Information System (OAIS Reference Model.  We describe two tools which have been specifically developed to aid in the curation of CAD engineering models in the context of PLM: Lightweight Models with Multilayered Annotation (LiMMA and a Registry/Repository of Representation Information for Engineering (RRoRIfE.

  6. Man-Machine Interface Design for Modeling and Simulation Software

    OpenAIRE

    Arnstein J. Borstad

    1986-01-01

    Computer aided design (CAD) systems, or more generally interactive software, are today being developed for various application areas like VLSI-design, mechanical structure design, avionics design, cartographic design, architectual design, office automation, publishing, etc. Such tools are becoming more and more important in order to be productive and to be able to design quality products. One important part of CAD-software development is the man-machine interface (MMI) design.

  7. CAD/CAM. High-Technology Training Module.

    Science.gov (United States)

    Zuleger, Robert

    This high technology training module is an advanced course on computer-assisted design/computer-assisted manufacturing (CAD/CAM) for grades 11 and 12. This unit, to be used with students in advanced drafting courses, introduces the concept of CAD/CAM. The content outline includes the following seven sections: (1) CAD/CAM software; (2) computer…

  8. Use of computer modeling to aid in hydraulic barrier design

    International Nuclear Information System (INIS)

    Releases of No. 6 and No. 4 fuel oil were discovered at a private boarding school. The releases impact a nearby pond with non-aqueous phase liquid hydrocarbon (NAPL), and threaten to impact an adjacent wetland. Prior to implementation of a permanent remedial solution, such as surfactant treatment and bioremediation, immediate containment of the NAPL was proposed via a barrier-gate containment system. The proposed barrier-gate containment system consisted of a high-density polyethylene barrier, horizontal wells, three flow-through gates, and downgradient infiltration galleries. Computer modeling of groundwater and NAPL flow was conducted utilizing a finite element multiphase model to evaluate the impacts to local hydrogeology associated with the barrier. These impacts included upgradient groundwater mounding and restriction of groundwater flux to the wetland. Model simulations aided in the identification of improvements to the initial barrier design and guided subsequent design modifications. Results of the simulations indicate the usefulness of computer modeling in containment system design

  9. An Instructional Method for the AutoCAD Modeling Environment.

    Science.gov (United States)

    Mohler, James L.

    1997-01-01

    Presents a command organizer for AutoCAD to aid new uses in operating within the 3-D modeling environment. Addresses analyzing the problem, visualization skills, nonlinear tools, a static view of a dynamic model, the AutoCAD organizer, environment attributes, and control of the environment. Contains 11 references. (JRH)

  10. Computer-aided design of bromelain and papain covalent immobilization

    OpenAIRE

    Bessy Cutiño-Avila; Dayrom Gil Pradas; Carlos Aragón Abreu; Yuniel Fernández Marrero; Martha Hernández de la Torre; Emir Salas Sarduy; María de los Ángeles Chávez Planes; José Manuel Guisán Seijas; Joaquín Díaz Brito; Alberto del Monte-Martínez

    2014-01-01

    Título en español: Diseño asistido por computadora de la inmovilización covalente de bromelina y papaína.Título corto: Computer-aided design of bromelain and papain. Abstract: Enzymes as immobilized derivatives have been widely used in Food, Agrochemical, Pharmaceutical and Biotechnological industries. Protein immobilization is probably the most used technology to improve the operational stability of these molecules. Bromelain (Ananas comosus) and papain (Carica papaya) are cystein proteases ...

  11. A BIST GENERATOR CAD TOOL FOR NUMERIC INTEGRATED CIRCUITS

    Directory of Open Access Journals (Sweden)

    Chiraz Khedhiri

    2011-07-01

    Full Text Available This paper describes a training and research tool for learning basic issues related to BIST (Built-In Self-Test generator. The main didactic aim of the tool is presenting complicated concepts in a comprehensivegraphical and analytical way. The paper describes a computer-aided design (CAD that is used to generateautomatically the BIST to any digital circuit. This software technique attempts to reduce the amount ofextra hardware and cost of the circuit.In order to make our software being easily available, we used the Java platform, which is supported bymost operating systems. The multi-platform JAVA runtime environment allows for easy access and usage ofthe tool.

  12. Accelerating Battery Design Using Computer-Aided Engineering Tools: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Pesaran, A.; Heon, G. H.; Smith, K.

    2011-01-01

    Computer-aided engineering (CAE) is a proven pathway, especially in the automotive industry, to improve performance by resolving the relevant physics in complex systems, shortening the product development design cycle, thus reducing cost, and providing an efficient way to evaluate parameters for robust designs. Academic models include the relevant physics details, but neglect engineering complexities. Industry models include the relevant macroscopic geometry and system conditions, but simplify the fundamental physics too much. Most of the CAE battery tools for in-house use are custom model codes and require expert users. There is a need to make these battery modeling and design tools more accessible to end users such as battery developers, pack integrators, and vehicle makers. Developing integrated and physics-based CAE battery tools can reduce the design, build, test, break, re-design, re-build, and re-test cycle and help lower costs. NREL has been involved in developing various models to predict the thermal and electrochemical performance of large-format cells and has used in commercial three-dimensional finite-element analysis and computational fluid dynamics to study battery pack thermal issues. These NREL cell and pack design tools can be integrated to help support the automotive industry and to accelerate battery design.

  13. Immediate CAD/ CAM Custom Fabricated Dental Implants

    Directory of Open Access Journals (Sweden)

    Jafar Kolahi

    2010-11-01

    Full Text Available Introduction: There will almost always be gaps between cylin-drical or screw shaped prefabricated implant surface and funnel-shaped tooth socket when an implant is placed immediately after tooth extraction. Hence expensive and difficult bone grafting is re-quired. A custom fabricated implant will be a pragmatic solution for this limitation.The hypothesis: First step following extraction of a tooth is data capture or scanning via a 3D scan method e.g. coordinate measuring machine or non-contact laser scanners such as triangulation range finder. Second step is reconstruction or modeling via editable CAD (computer-aided design model, allowing us to add retentive holes and correction of implant angle. Third step is fabrication via CAM (computer aided manufacturing followed by plasma cleaning process. Fourth step is insertion of the CAD/CAM custom fabricated one-stage implant in the fresh tooth socket. Optimal time for this step is 24-48 hours after extraction. The custom fabricated implant should not load 3-4 months. Usage of chlorhexidine mouth-rinse or chewing gum twice daily for 2 weeks and, in some cases oral antibiotic is recommended. Evaluation of the hypothesis: Contemporary dental implant system faced with several clinical and anatomical limitations such is low sinuses or nerve bundles. Complex and expensive surgical procedures such as nerve repositioning and sinus lift are frequently required. With custom fabricated implant we can overcome several of these limitations because insertion of custom fabricated implant will perform before alveolar bone recession.

  14. Bidirectional Conversion between CAD Model and TRIPOLI Model: An Extending Function of MCAM

    Energy Technology Data Exchange (ETDEWEB)

    Lu, L.; Zeng, Q.; Zhang, J.; Lia, Y.; Ding, A.; Wua, Y. [Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui (China); Chang, H. [Institute of nuclear and new energy technology, Tsinghua University, Beijing (China)

    2008-07-01

    TRIPOLI is a Monte Carlo (MC) particle transport code which can be applied to nuclear analysis of complex nuclear devices; however, modeling of a complex geometry for TRIPOLI computation is a time-consuming and error-prone task. MCAM (Monte Carlo automatic modeling system) is an interface code that can facilitate MC modeling by employing Computer Aided Design (CAD) technology. An extended function of MCAM was developed to implement the bidirectional conversion between CAD model and TRIPOLI model. Different geometry representations of CAD model and TRIPOLI model, as well as the process of bidirectional conversion between the two representations were introduced. ITER benchmark model, a complex fusion system, was converted into TRIPOLI model for validation, On the basis of the converted model, actual calculation of neutron flux on inboard blanket was performed, and the results were compared with that of MCNP calculation, which showed a good agreement. (authors)

  15. AutoCAD 2013 and AutoCAD LT 2013 bible

    CERN Document Server

    Finkelstein, Ellen

    2012-01-01

    The bestselling guide to AutoCAD, fully updated for the 2013 version AutoCAD, the number one architectural drawing software, can be challenging to learn. This comprehensive guide has sold more than 160,000 copies in previous editions and is the go-to resource for architects, engineers, drafters, interior designers, and space planners who need to learn and use AutoCAD and AutoCAD LT. From the basics of creating drawings and using commands to 2D and 3D drawing techniques, using layers, rendering, and customizing the program, this book covers it all. A Quick Start guide allows eve

  16. Computer aided design of reentrant coaxial filters including coaxial excitation

    NARCIS (Netherlands)

    Boria, V.; Gerini, G.; Guglielmi, M.

    1999-01-01

    An advanced EM based CAD tool is used for the detailed characterisation of a family of reentrant coaxial waveguide filters. The EM analysis includes the effects of tuning screws and of the input/output coaxial excitation. The software is essentially used as an efficient replacement for the tradition

  17. Systematic Computer-Aided Framework for Sustainable Chemical Product Design

    DEFF Research Database (Denmark)

    Cignitti, Stefano; Zhang, Lei; Kalakul, Sawitree;

    Computer-aided product design (CAPD) is a method for the generation and selection of novel pure, mixed and blended chemical products [1]. In CAPD, the chemical product is generated and selected based on defined structure, property and process/application constraints. Several challenges exist...... for CAPD, including the accuracy of the property estimation, molecular structure generation, inclusion of sustainability, process and application targets and needs in the problem formulation. CAPD has been widely utilized for the synthesis of several types of products, such as solvents, polymers, fuels...... and formulated products [2]. However, for product design problems where the process needs and sustainability possess demanding constraints, the complexity of the problem is increased as the relation between product property, sustainability and process criteria is difficult to mathematically define. In this work...

  18. CAD/CAM fabricated single-unit all-ceramic post-core-crown restoration

    Directory of Open Access Journals (Sweden)

    Thilla Sekar Vinothkumar

    2011-01-01

    Full Text Available This case report explains about an innovative treatment strategy for the management of damaged anterior teeth with reduced incisal clearance by means of a single-unit all-ceramic post-core-crown zirconia ceramic restoration fabricated by Computer-aided designing and computer-aided manufacturing (CAD/CAM technology. The reinforced zirconia ceramics allow fabrication of durable esthetic restorations in cases with high functional loading and the unification of the post, core, and crown in a single unit decreases the frequency of failure by creating a monobloc effect. In addition, the use of CAD/CAM technology for designing and fabricating ceramic restorations offers the option of expeditiously preparing these high-strength all-ceramic restorations.

  19. CAD/CAM fabricated single-unit all-ceramic post–core–crown restoration

    Science.gov (United States)

    Vinothkumar, Thilla Sekar; Kandaswamy, Deivanayagam; Chanana, Pallavi

    2011-01-01

    This case report explains about an innovative treatment strategy for the management of damaged anterior teeth with reduced incisal clearance by means of a single-unit all-ceramic post–core–crown zirconia ceramic restoration fabricated by Computer-aided designing and computer-aided manufacturing (CAD/CAM) technology. The reinforced zirconia ceramics allow fabrication of durable esthetic restorations in cases with high functional loading and the unification of the post, core, and crown in a single unit decreases the frequency of failure by creating a monobloc effect. In addition, the use of CAD/CAM technology for designing and fabricating ceramic restorations offers the option of expeditiously preparing these high-strength all-ceramic restorations. PMID:21691515

  20. Comparison of CAD-CAM and hand made sockets for PTB prostheses.

    Science.gov (United States)

    Köhler, P; Lindh, L; Netz, P

    1989-04-01

    The aim of the present study was to compare sockets for below-knee (BK) prostheses made by Computer Aided Design-Computer Aided Manufacture (CAD-CAM) to those made by hand. The patients in the study were provided with two prostheses each, which apart from the sockets, were identical. One socket was made by the CAD-CAM technique developed at the Bioengineering Centre, Roehampton, University College London and one was made by hand at the OT-Centre, Stockholm, Sweden. The results were based on investigation of eight unilateral below-knee amputees evaluating their own sockets by Visual Analogous Scale with respect to comfort, pressure, and pain. The sockets were evaluated on seven occasions, at two tests, on delivery, after use every second day for six days and every second week for two weeks. All CAD-CAM sockets except one had to be changed once as compared to the hand made of which only two had to be changed. As to comfort it could not be demonstrated that there was any significant difference between the two types of sockets and both types were well accepted by all patients. Differences in pressure and pain were rarely reported. There were obvious differences between the two types of socket with respect to height, width, and inner surface configuration. The authors feel that CAD-CAM will in the near future be an excellent tool for design and manufacture of prosthetic sockets.

  1. Computer-Aided Chemical Product Design Framework: Design of High Performance and Environmentally Friendly Refrigerants

    DEFF Research Database (Denmark)

    Cignitti, Stefano; Zhang, Lei; Gani, Rafiqul

    on refrigerant design for a heat pump cycle. It is shown how the presented framework can generate optimal novel refrigerants that are high performing and environmentally friendly. This is achieved through integrated product-process based optimization objective, namely, target physicochemical and environmental...... properties and needs should carefully be selected for a given heat pump cycle to ensure that an optimum refrigerant is found? How can cycle performance and environmental criteria be integrated at the product design stage and not in post-design analysis? Computer-aided product design methods enable...... the possibility of designing novel molecules, mixtures and blends, such as refrigerants through a systematic framework (Cignitti et al., 2015; Yunus et al., 2014). In this presentation a computer-aided framework is presented for chemical product design through mathematical optimization. Here, molecules, mixtures...

  2. The Effect of Using Computer Technology Tools to Enhance the Teaching-Learning Process in CAD-CAM-CNC Module in Mechanical Engineering Subject Area

    OpenAIRE

    Abdulrasool, Salah Mahdi; Mishra, Rakesh; Khalaf, Haifa; Al Seddiqi, Mohamed

    2010-01-01

    This study presents the evaluation of Computer Assisted Learning (CAL) package included in the teaching and learning methodology of computer aided design- computer aided design - computer numerical control (CAD-CAM-CNC) module. Three groups of students with similar pre-abilities were exposed to three different teaching learning methodologies.The effectiveness of these three methods was determined by questionnaires completed by the students and collected by first author. Their answers were ...

  3. Robust Design of Pilot-symbol-aided MIMO Channel Estimation

    Institute of Scientific and Technical Information of China (English)

    LUO Zhen-dong; LIU Yuan-an; GAO Jin-chun

    2004-01-01

    This paper investigates pilot-symbol-aided channel estimation/prediction for Multiple-Input Multiple-Output (MIMO) systems in fast fading environments. We first derive the design criteria of the optimal pilot blocks for energy, power and bandwidth-limited systems, respectively. Then two low-complexity channel estimation schemes are provided. Finally, we present a robust Minimum Mean Square Error (MMSE) channel estimator based on channel time correlation. Simulation shows the proposed MMSE estimator is considerably insensitive to channel statistics and significantly outperforms the traditional estimators with a low additional complexity in fast fading environments. By simply adjusting some parameters, the MMSE estimator can work as an estimator and a predictor simultaneously.

  4. Computer aided microbial safety design of food processes.

    Science.gov (United States)

    Schellekens, M; Martens, T; Roberts, T A; Mackey, B M; Nicolaï, B M; Van Impe, J F; De Baerdemaeker, J

    1994-12-01

    To reduce the time required for product development, to avoid expensive experimental tests, and to quantify safety risks for fresh products and the consequence of processing there is a growing interest in computer aided food process design. This paper discusses the application of hybrid object-oriented and rule-based expert system technology to represent the data and knowledge of microbial experts and food engineers. Finite element models for heat transfer calculation routines, microbial growth and inactivation models and texture kinetics are combined with food composition data, thermophysical properties, process steps and expert knowledge on type and quantity of microbial contamination. A prototype system has been developed to evaluate changes in food composition, process steps and process parameters on microbiological safety and textual quality of foods.

  5. Using a Latino Lens to Reimagine Aid Design and Delivery

    Science.gov (United States)

    Santiago, Deborah A.

    2013-01-01

    Federal financial aid is critical to student access and success in postsecondary education for many students, including most Latinos. However, three current realities are challenging the effectiveness of federal financial aid policy today: (1) the inability of federal aid to keep pace with the increase in college costs for students; (2) the…

  6. CAD/CAM of braided preforms for advanced composites

    Science.gov (United States)

    Yang, Gui; Pastore, Christopher; Tsai, Yung Jia; Soebroto, Heru; Ko, Frank

    A CAD/CAM system for braiding to produce preforms for advanced textile structural composites is presented in this paper. The CAD and CAM systems are illustrated in detail. The CAD system identifies the fiber placement and orientation needed to fabricate a braided structure over a mandrel, for subsequent composite formation. The CAM system uses the design parameters generated by the CAD system to control the braiding machine. Experimental evidence demonstrating the success of combining these two technologies to form a unified CAD/CAM system for the manufacture of braided fabric preforms with complex structural shapes is presented.

  7. Hardware synthesis from DDL. [Digital Design Language for computer aided design and test of LSI

    Science.gov (United States)

    Shah, A. M.; Shiva, S. G.

    1981-01-01

    The details of the digital systems can be conveniently input into the design automation system by means of Hardware Description Languages (HDL). The Computer Aided Design and Test (CADAT) system at NASA MSFC is used for the LSI design. The Digital Design Language (DDL) has been selected as HDL for the CADAT System. DDL translator output can be used for the hardware implementation of the digital design. This paper addresses problems of selecting the standard cells from the CADAT standard cell library to realize the logic implied by the DDL description of the system.

  8. Structured computer-aided digital logic design: the S-1 Design System

    Energy Technology Data Exchange (ETDEWEB)

    Widdoes, L.C. Jr.; McWilliams, T.M.

    1977-03-31

    Structured computer-aided digital logic design is defined and an example of it is given, the S-1 Design System. It is noted that such a system has resulted in a very large reduction in the amount of designer effort required to complete the design of a large-scale digital processing system in the first exercise of its capabilities. This basic and generally applicable advance in digital design technology may be expected to affect quite favorably all complex digital systems developments. 3 figures.

  9. Paper-Less CAD/CAM For Accelerator Components

    Energy Technology Data Exchange (ETDEWEB)

    Franks, R M; Alford, O; Bertolini, L R

    2001-01-12

    Computer-aided design and manufacture (CAD/CAM) have enabled advances in the design and manufacture of many accelerator components, though government procurement rules tend to inhibit its use. We developed and executed a method that provides adequate documentation for the procurement process, industrial vendor manufacturing processes, and laboratory installation activities. We detail our experiences in the design and manufacture of 60 separate and unique PEP-II Low Energy Ring Interaction Region vacuum chambers totaling {approx} 140m in length as an example of how we used this technique, reducing design effort and manufacturing risk while streamlining the production process. We provide ''lessons learned'' to better implement and execute the process in subsequent iterations. We present our study to determine the estimated savings in the design and production of the Spallation Neutron Source room temperature linac if this process were utilized.

  10. Paper-Less CAD/CAM For Accelerator Components

    International Nuclear Information System (INIS)

    Computer-aided design and manufacture (CAD/CAM) have enabled advances in the design and manufacture of many accelerator components, though government procurement rules tend to inhibit its use. We developed and executed a method that provides adequate documentation for the procurement process, industrial vendor manufacturing processes, and laboratory installation activities. We detail our experiences in the design and manufacture of 60 separate and unique PEP-II Low Energy Ring Interaction Region vacuum chambers totaling ∼ 140m in length as an example of how we used this technique, reducing design effort and manufacturing risk while streamlining the production process. We provide ''lessons learned'' to better implement and execute the process in subsequent iterations. We present our study to determine the estimated savings in the design and production of the Spallation Neutron Source room temperature linac if this process were utilized

  11. Ergonomics Perspective in Agricultural Research: A User-Centred Approach Using CAD and Digital Human Modeling (DHM) Technologies

    Science.gov (United States)

    Patel, Thaneswer; Sanjog, J.; Karmakar, Sougata

    2016-09-01

    Computer-aided Design (CAD) and Digital Human Modeling (DHM) (specialized CAD software for virtual human representation) technologies endow unique opportunities to incorporate human factors pro-actively in design development. Challenges of enhancing agricultural productivity through improvement of agricultural tools/machineries and better human-machine compatibility can be ensured by adoption of these modern technologies. Objectives of present work are to provide the detailed scenario of CAD and DHM applications in agricultural sector; and finding out means for wide adoption of these technologies for design and development of cost-effective, user-friendly, efficient and safe agricultural tools/equipment and operator's workplace. Extensive literature review has been conducted for systematic segregation and representation of available information towards drawing inferences. Although applications of various CAD software have momentum in agricultural research particularly for design and manufacturing of agricultural equipment/machinery, use of DHM is still at its infancy in this sector. Current review discusses about reasons of less adoption of these technologies in agricultural sector and steps to be taken for their wide adoption. It also suggests possible future research directions to come up with better ergonomic design strategies for improvement of agricultural equipment/machines and workstations through application of CAD and DHM.

  12. Ergonomics Perspective in Agricultural Research: A User-Centred Approach Using CAD and Digital Human Modeling (DHM) Technologies

    Science.gov (United States)

    Patel, Thaneswer; Sanjog, J.; Karmakar, Sougata

    2016-06-01

    Computer-aided Design (CAD) and Digital Human Modeling (DHM) (specialized CAD software for virtual human representation) technologies endow unique opportunities to incorporate human factors pro-actively in design development. Challenges of enhancing agricultural productivity through improvement of agricultural tools/machineries and better human-machine compatibility can be ensured by adoption of these modern technologies. Objectives of present work are to provide the detailed scenario of CAD and DHM applications in agricultural sector; and finding out means for wide adoption of these technologies for design and development of cost-effective, user-friendly, efficient and safe agricultural tools/equipment and operator's workplace. Extensive literature review has been conducted for systematic segregation and representation of available information towards drawing inferences. Although applications of various CAD software have momentum in agricultural research particularly for design and manufacturing of agricultural equipment/machinery, use of DHM is still at its infancy in this sector. Current review discusses about reasons of less adoption of these technologies in agricultural sector and steps to be taken for their wide adoption. It also suggests possible future research directions to come up with better ergonomic design strategies for improvement of agricultural equipment/machines and workstations through application of CAD and DHM.

  13. Virtually designed and CAD/CAM-fabricated lithium disilicate prostheses for an esthetic maxillary rehabilitation: a senior dental student clinical report.

    Science.gov (United States)

    Zandinejad, Amirali; Metz, Michael; Stevens, Paul; Lin, Wei-Shao; Morton, Dean

    2015-04-01

    During their education, dental students seek to be involved in comprehensive esthetic treatment for the rehabilitation of lost, damaged, or discolored tooth structure. Due to technological advances and patient exposure to dental advertising, recent dental school graduates can find themselves under great expectations with limited clinical experience. With the implementation of an oral health and rehabilitation department at the University of Louisville Dental School, dental students have the opportunity to plan treatment and treat such patients under the supervision of faculty with advanced training in prosthodontics and restorative dentistry. The work flow of multiple consecutive lithium disilicate ceramic prostheses using a digital impression, virtual CAD/CAM design, and milled fabrication as planned and executed by a senior dental student is presented.

  14. The Influence of Material Type, Preparation Design, and Tooth Substrate on Fracture Resistance of Molar Onlays

    OpenAIRE

    Al Khalifah, Shahed Ali M.

    2016-01-01

    Tooth colored all ceramic restorations have been the treatment preference of many patients for esthetics and biocompatibility. This study aimed to test the fracture resistance of posterior ceramic onlays milled with computer-aided design and computer aided manufacturing (CAD/CAM) machines.The effects of material type, preparation design, and tooth substrate were evaluated using a full-block design. Ninety teeth were tested. Three different CAD/CAM ceramic onlay material types were included: a...

  15. Custom hip prostheses by integrating CAD and casting technology

    Science.gov (United States)

    Silva, Pedro F.; Leal, Nuno; Neto, Rui J.; Lino, F. Jorge; Reis, Ana

    2012-09-01

    Total Hip Arthroplasty (THA) is a surgical intervention that is being achieving high rates of success, leaving room to research on long run durability, patient comfort and costs reduction. Even so, up to the present, little research has been done to improve the method of manufacturing customized prosthesis. The common customized prostheses are made by full machining. This document presents a different approach methodology which combines the study of medical images, through CAD (Computer Aided Design) software, SLadditive manufacturing, ceramic shell manufacture, precision foundry with Titanium alloys and Computer Aided Manufacturing (CAM). The goal is to achieve the best comfort for the patient, stress distribution and the maximum lifetime of the prosthesis produced by this integrated methodology. The way to achieve this desiderate is to make custom hip prosthesis which are adapted to each patient needs and natural physiognomy. Not only the process is reliable, but also represents a cost reduction comparing to the conventional full machined custom hip prosthesis.

  16. CAD, 3D modeling, engineering analysis, and prototype experimentation industrial and research applications

    CERN Document Server

    Zheng Li, Jeremy

    2015-01-01

    This succinct book focuses on computer aided design (CAD), 3-D modeling, and engineering analysis and the ways they can be applied effectively in research and industrial sectors including aerospace, defense, automotive, and consumer products. These efficient tools, deployed for R&D in the laboratory and the field, perform efficiently three-dimensional modeling of finished products, render complex geometrical product designs, facilitate structural analysis and optimal product design, produce graphic and engineering drawings, and generate production documentation. Written with an eye toward green energy installations and novel manufacturing facilities, this concise volume enables scientific researchers and engineering professionals to learn design techniques, control existing and complex issues, proficiently use CAD tools, visualize technical fundamentals, and gain analytic and technical skills. This book also: ·       Equips practitioners and researchers to handle powerful tools for engineering desi...

  17. AutoCAD workbook

    CERN Document Server

    Metherell, Phil

    1989-01-01

    AutoCAD Workbook helps new users learn the basics of AutoCad, providing guidance on most of the commonly used functions in which the program operates.This book discusses loading AutoCad and starting a drawing; drawing and erasing lines, circles, and arcs; and setting up the drawing environment. The topics on drawing and editing polylines; entering text and text styles; and layers, linetype, and color are also considered. This publication likewise covers creating and using blocks, hatching and extracting information, dimensioning drawings, 3D visualization, and plotting a drawing. Other

  18. Computer-Aided Design of Nanocapsules for Therapeutic Delivery

    Directory of Open Access Journals (Sweden)

    Zeina Shreif

    2009-01-01

    Full Text Available The design of nanocapsules for targeted delivery of therapeutics presents many, often seemingly self-contradictory, constraints. An algorithm for predicting the physico-chemical characteristics of nanocapsule delivery and payload release using a novel all-atom, multiscale technique is presented. This computational method preserves key atomic-scale behaviours needed to make predictions of interactions of functionalized nanocapsules with the cell surface receptors, drug, siRNA, gene or other payload. We show how to introduce a variety of order parameters with distinct character to enable a multiscale analysis of a complex system. The all-atom formulation allows for the use of an interatomic force field, making the approach universal and avoiding recalibration with each new application. Alternatively, key parameters, which minimize the need for calibration, are also identified. Simultaneously, the methodology enables predictions of the supra-nanometer-scale behaviour, such as structural transitions and disassembly of the nanocapsule accompanying timed payload release or due to premature degradation. The final result is a Fokker–Planck equation governing the rate of stochastic payload release and structural changes and migration accompanying it. A novel “salt shaker” effect that underlies fluctuation-enhancement of payload delivery is presented. Prospects for computer-aided design of nanocapsule delivery system are discussed.

  19. CEREC椅旁CAD/CAM诊室技术25年的研究进展%Research progress on chair-side CAD/CAM in-office technology about CEREC during 25 years

    Institute of Scientific and Technical Information of China (English)

    王林虎

    2012-01-01

    25年来,椅旁计算机辅助设计和计算机辅助制作(CAD/CAM)技术在口腔诊室中的应用不断发展,口腔材料的改进也加速了CAD/CAM技术的革新,这些使得口腔医生几乎能迅速、精确地为每位患者提供高品质、高美观的修复体.基于CAD/CAM技术在口腔科应用的不断增加,制造商对CEREC系统的硬件、软件和材料进行了大量改进,口腔医生可以在诊室内不受工艺流程的干扰制作出技工室水平的修复体.本文就CEREC椅旁CAD/CAM系统支持材料及AC系统创新发展作一综述.%The in-office application of computer-aided design/computer-aided manufacturing(CAD/CAM) has evolved continually during 25 years, and material enhancements made in conjunction with this evolution have improved the speed and precision with which dentists can place high-quality, esthetic restorations for almost every dental application. On the basis of the growth of CAD/CAM, the manufacturer has made substantial improvements to all aspects of the CEREC system, including hardware, software and materials. Dentists can create laboratory-grade restorations in their offices with little disturbance to work-flow patterns for most dental practices. Here the authors present an overview of the chair-side CAD/CAM system and available materials.

  20. 使用AutoCAD快速准确绘图经验谈%Quickly and Accurately Using the AutoCAD Drawing Experience

    Institute of Scientific and Technical Information of China (English)

    徐洪池

    2013-01-01

      AutoCAD software is an important tool for computer-aided design, but it is not easy to master for beginners, from how to improve the drawing speed and how accurate drawing two angles of an effective way to use AutoCAD, and share the learning and use of AutoCAD expe⁃rience the hope that helpful AutoCAD learners.%  AutoCAD软件是计算机辅助设计的重要工具,但对初学者并不易掌握,文章从如何提高绘图速度和如何准确绘图两个角度介绍了使用AutoCAD的有效方法,并分享了AutoCAD的学习和使用心得,希望对AutoCAD的学习者有所帮助。

  1. CADICAM Design of Trunnion Mount (Short Communication

    Directory of Open Access Journals (Sweden)

    Rahul D. Basu

    2002-04-01

    Full Text Available The computer-aided design (CAD, computer-aided manufacturing (CAM of a 3-D trunnion mount located on the intercasing housing of a gas turbine engine is described. The mount carries load and thrust, hence stress-concentrating locations, like sharp edges and corners must be avoided. A program involving CAD, CAM and post-processing CAD surfaces for tool paths has been developed. Preliminary machining of a scrap aluminum piece that verified the program is described. This method is applicable to a wide variety of proprietary packages.

  2. Dentin Bond Strength of Two Recent CAD/CAM-Materials after Storage

    OpenAIRE

    Flury, Simon; Schmidt, Stefanie Z.; Peutzfeldt, Anne; Lussi, Adrian

    2014-01-01

    Purpose: To investigate the bond strength to dentin of two recent resin-ceramic materials for computer-aided design/computer-aided manufacturing (CAD/CAM) after 24 hours and after six months storage. Methods and Materials: Ninety cylinders were milled out of Lava Ultimate (3M ESPE) and 90 cylinders out of VITA ENAMIC (VITA Zahnfabrik) (dimension of cylinders: ∅=3.6 mm, h=2 mm). All Lava Ultimate cylinders were sandblasted (aluminium oxide, grain size: 27 μm) and cleaned with ethanol, where...

  3. Sizing of Compression Coil Springs Gas Regulators Using Modern Methods CAD and CAE

    Directory of Open Access Journals (Sweden)

    Adelin Ionel Tuţă

    2010-10-01

    Full Text Available This paper presents a method for compression coil springs sizing by gas regulators composition, using CAD techniques (Computer Aided Design and CAE (Computer Aided Engineering. Sizing is to optimize the functioning of the regulators under dynamic industrial and house-hold. Gas regulator is a device that automatically and continuously adjusted to maintain pre-set limits on output gas pressure at varying flow and input pressure. The performances of the pressure regulators like automatic systems depend on their behaviour under dynamic opera-tion. Time constant optimization of pneumatic actuators, which drives gas regulators, leads to a better functioning under their dynamic.

  4. Some dimensions of cognitive typology of computer-aided design

    Science.gov (United States)

    Chao, M.; Samuel, A. E.

    1996-03-01

    Verbal protocol analysis has been widely used to capture the processes of problem solving behavior. Early research studied humans solving well-defined problems such as cryptarithmetic and Tower of Hanoi problems, but it also extended to chess. Other research has focused on continuous and discrete process control tasks. Our work explores some of the cognitive difficulties involved in CAD model construction. It addresses mental transformations in the physical world, and the nature of cognitive loads when constructing physical models. It also investigates the transport of skills from physical world model construction to a screen world construction process. This paper describes our findings and performance measures in the construction of physical models.

  5. STRATEGY FOR IMPROVEMENT OF SAFETY AND EFFICIENCY OF COMPUTER-AIDED DESIGN ANALYSIS OF CIVIL ENGINEERING STRUCTURES ON THE BASIS OF THE SYSTEM APPROACH

    Directory of Open Access Journals (Sweden)

    Zaikin Vladimir Genrikhovich

    2012-12-01

    Full Text Available The authors highlight three problems of the age of information technologies and proposes the strategy for their resolution in relation to the computer-aided design of civil engineering structures. The authors express their concerns in respect of globalization of software programmes designated for the analysis of civil engineering structures and employed outside of Russia. The problem of the poor quality of the input data has reached Russia. Lately, the rate of accidents of buildings and structures has been growing not only in Russia. Control over efficiency of design projects is hardly performed. This attitude should be changed. Development and introduction of CAD along with the application the efficient methods of projection of behaviour of building structures are in demand. Computer-aided calculations have the function of a logical nucleus, and they need proper control. The system approach to computer-aided calculations and technologies designated for the projection of accidents is formulated by the authors. Two tasks of the system approach and fundamentals of the strategy for its implementation are formulated. The study of cases of negative results of computer-aided design of engineering structures was performed and multi-component design patterns were developed. Conclusions concerning the results of researches aimed at regular and wide-scale implementation of the strategy fundamentals are formulated. Organizational and innovative actions concerning the projected behaviour of civil engineering structures proposed in the strategy are to facilitate: safety and reliability improvement of buildings and structures; saving of building materials and resources; improvement of labour efficiency of designers; modernization and improvement of accuracy of projected behaviour of buildings and building standards; closer ties between civil and building engineering researchers and construction companies; development of competitive environment to boost

  6. MS AutoCad

    DEFF Research Database (Denmark)

    Andersen, Michael Rye; Heinicke, Hugo

    1996-01-01

    Formålet med dette notat er at give en introduktion til tegning af et generalarrangement ved anvendelse af CAD-programmet AutoCAD. Generalarrangementets formål er at skabe en overskuelig præsentation af et skibsprojekt. Det skal gøres indenfor de rammer, som ligger til grund for praktiskprojekter......Formålet med dette notat er at give en introduktion til tegning af et generalarrangement ved anvendelse af CAD-programmet AutoCAD. Generalarrangementets formål er at skabe en overskuelig præsentation af et skibsprojekt. Det skal gøres indenfor de rammer, som ligger til grund...

  7. A computer-aided molecular design framework for crystallization solvent design

    DEFF Research Database (Denmark)

    Karunanithi, Arunprakash T.; Achenie, Luke E.K.; Gani, Rafiqul

    2006-01-01

    One of the key decisions in designing solution crystallization processes is the selection of solvents. In this paper, we present a computer-aided molecular design (CAMD) framework for the design and selection of solvents and/or anti-solvents for solution crystallization. The CAMD problem...... solvent molecules. Solvent design and selection for two types of solution crystallization processes namely cooling crystallization and drowning out crystallization are presented. In the first case study, the design of single compound solvent for crystallization of ibuprofen, which is an important...... pharmaceutical compound, is addressed. One of the important issues namely, the effect of solvent on the shape of ibuprofen crystals is also considered in the MINLP model. The second case study is a mixture design problem where an optimal solvent/anti-solvent mixture is designed for crystallization of ibuprofen...

  8. The N4 CAD chain: Another electricite de France breakthrough in nuclear engineering

    Energy Technology Data Exchange (ETDEWEB)

    Cornon, P.; Durey, P. [Electricite de France, Clamart (France)

    1996-12-31

    With the previous pressurized water reactor (PWR) series (1300 MW), Electricite de France (EdF) has experienced the first chain of computer-aided design (CAD) tools from programming drawings to instrumentation and control microprocessor memories. The Engineering and Construction Division of EdF decided to integrate the CAD tools in the design and construction process of its new N4 series (1400-MW PWR). At that time, EdF determined four safety and data quality principles for the human/machine interface of the CAD: 1. Unique data capture: A common alphanumeric database shares all the information used by more than one application, so this information is typed only once and can be verified independently. 2. Intrinsic consistency: Added to the previous principle, data consistency is also ensured by every application that provides ways to enter only allowed data when it is possible. This is completed by some checking facilities. 3. Ergonomy: Making extensive use of windows, buttons, pictures, and wysiwyg facilities, the CAD section develops applications speaking the real language of every designer who is able to understand and verify her/his work. 4. On-line help: For any question, prompted by any application, some on-line help has been written giving the list of allowed answers with explanations and/or examples.

  9. True Concurrent Thermal Engineering Integrating CAD Model Building with Finite Element and Finite Difference Methods

    Science.gov (United States)

    Panczak, Tim; Ring, Steve; Welch, Mark

    1999-01-01

    Thermal engineering has long been left out of the concurrent engineering environment dominated by CAD (computer aided design) and FEM (finite element method) software. Current tools attempt to force the thermal design process into an environment primarily created to support structural analysis, which results in inappropriate thermal models. As a result, many thermal engineers either build models "by hand" or use geometric user interfaces that are separate from and have little useful connection, if any, to CAD and FEM systems. This paper describes the development of a new thermal design environment called the Thermal Desktop. This system, while fully integrated into a neutral, low cost CAD system, and which utilizes both FEM and FD methods, does not compromise the needs of the thermal engineer. Rather, the features needed for concurrent thermal analysis are specifically addressed by combining traditional parametric surface based radiation and FD based conduction modeling with CAD and FEM methods. The use of flexible and familiar temperature solvers such as SINDA/FLUINT (Systems Improved Numerical Differencing Analyzer/Fluid Integrator) is retained.

  10. CAD二次开发及其在铁路信号施工图设计中的应用%CAD Secondary Development and Application for Design of Shop Drawing on Railway Signal

    Institute of Scientific and Technical Information of China (English)

    杨瑞宇

    2012-01-01

    Computer-aided design software of section signal is currently used only for the ZPW-2000A section design, if applied to the ZPW-2000R, a lot of modificatory work is required to meet project needs. With the increasing of ZPW-2000R project design, it is necessary to work out special software for the ZPW-2000R shop drawing design so as to improve design efficiency and quality. By means of C# programming language for secondary development of AutoCAD, with the independent sub-module design ideas, based on the information provided by relevant professionals which including the block section point, bridge and tunnel table and broken chain table, according to professional design principles and construction requirements, etc, the external parameters are set up. Then, a complete set of shop drawings for railway section are completed which including the plan, double track and cable pathway maps, and circuit diagram. The research results and design software developed have been successfully applied in engineering practice, and can fully meet the requirements of a large number of shop drawings with high precision for signal design.%目前使用的区间辅助设计软件只是针对ZPW-2000A区间设计,若将其运用于ZPW-2000R还需要大量的修改工作才能满足工程需要,随着ZPW-2000R工程设计的日益增多,为了提高出图质量和效率,研究出一种ZPW-2000R专用的施工图设计软件显得十分必要.软件利用C#语言对AutoCAD进行二次开发,采用分模块独立设计的思想,以上序相关专业提供的区间布点信息、桥隧信息及断链信息为基础,根据本专业设计原则和施工需要设置外部参数,即可完成包括平面图、双线及电缆径路图、电路图在内的区间整套施工设计图纸.研究成果和所开发的程序已成功运用于工程实践中,其功能完全满足信号专业出图多、精度高的需求.

  11. Influence of proximal box elevation on the marginal quality and fracture behavior of root-filled molars restored with CAD/CAM ceramic or composite onlays

    OpenAIRE

    Ilgenstein, Irina; Zitzmann, Nicola U.; Bühler, Julia; Wegehaupt, Florian J; Attin, Thomas; WEIGER, Roland; Krastl, Gabriel

    2015-01-01

    OBJECTIVES This study investigated the influence of proximal box elevation (PBE) with composite resin when applied to deep proximal defects in root-filled molars with mesio-occluso-distal (MOD) cavities, which were subsequently restored with computer-aided designed/computer-aided manufacturing (CAD/CAM) ceramic or composite restorations. MATERIALS AND METHOD Root canal treatment was performed on 48 human mandibular molars. Standardized MOD cavities were prepared with the distal box located...

  12. Perceptions of the Design of Voice Output Communication Aids

    Science.gov (United States)

    Judge, Simon; Townend, Gillian

    2013-01-01

    Background: Voice output communication aids (VOCAs) are a key form of aided communication within the field of augmentative and alternative communication (AAC). In recent years, rapid developments in technology have resulted in an explosion of devices available commercially, yet little research has been conducted into what people who use VOCAs…

  13. Design of 3D CAD Software with Four-Bar Mechanism%四杆机构的三维CAD软件设计

    Institute of Scientific and Technical Information of China (English)

    张瑞东

    2012-01-01

    The graphic method and analytic method are traditional ways for designing a planar four-bar mechanism. But the method of 3D CAD software can do the same thing. The method introduced in this paper is more simple and convenient than the other two methods, It can save much design time for the engineers and avoid any errors in the calculation process. It also can be applied to all the mechanism design tasks, and has obtained the excellent development in teaching and production practices.%图解法和解析法是设计平面四杆机构的基本方法,而使用三维CAD软件的设计方法则更高效和简便。使用这种方法的设计过程简单易懂,简便易行,大量地节省了工程人员的设计时间,避免了计算过程中的错误,可以推广应用到所有机构的设计过程中,并在教学和生产实践中取得发展。

  14. Engineering specification and system design for CAD/CAM of custom shoes. Phase 5: UMC involvement (January 1, 1989 - June 30, 1989)

    Science.gov (United States)

    Bao, Han P.

    1989-01-01

    The CAD/CAM of custom shoes is discussed. The solid object for machining is represented by a wireframe model with its nodes or vertices specified systematically in a grid pattern covering its entire length (point-to-point configuration). Two sets of data from CENCIT and CYBERWARE were used for machining purposes. It was found that the indexing technique (turning the stock by a small angle then moving the tool on a longitudinal path along the foot) yields the best result in terms of ease of programming, savings in wear and tear of the machine and cutting tools, and resolution of fine surface details. The work done using the LASTMOD last design system results in a shoe last specified by a number of congruent surface patches of different sizes. This data format was converted into a form amenable to the machine tool. It involves a series of sorting algorithms and interpolation algorithms to provide the grid pattern that the machine tool needs as was the case in the point to point configuration discussed above. This report also contains an in-depth treatment of the design and production technique of an integrated sole to complement the task of design and manufacture of the shoe last. Clinical data and essential production parameters are discussed. Examples of soles made through this process are given.

  15. DEMAID - A DESIGN MANAGER'S AID FOR INTELLIGENT DECOMPOSITION (MACINTOSH VERSION)

    Science.gov (United States)

    Rogers, J. L.

    1994-01-01

    Many engineering systems are large and multi-disciplinary. Before the design of new complex systems such as large space platforms can begin, the possible interactions among subsystems and their parts must be determined. Once this is completed the proposed system can be decomposed to identify its hierarchical structure. DeMAID (A Design Manager's Aid for Intelligent Decomposition) is a knowledge-based system for ordering the sequence of modules and identifying a possible multilevel structure for the design problem. DeMAID displays the modules in an N x N matrix format (called a design structure matrix) where a module is any process that requires input and generates an output. (Modules which generate an output but do not require an input, such as an initialization process, are also acceptable.) Although DeMAID requires an investment of time to generate and refine the list of modules for input, it could save a considerable amount of money and time in the total design process, particularly in new design problems where the ordering of the modules has not been defined. The decomposition of a complex design system into subsystems requires the judgement of the design manager. DeMAID reorders and groups the modules based on the links (interactions) among the modules, helping the design manager make decomposition decisions early in the design cycle. The modules are grouped into circuits (the subsystems) and displayed in an N x N matrix format. Feedback links, which indicate an iterative process, are minimized and only occur within a subsystem. Since there are no feedback links among the circuits, the circuits can be displayed in a multilevel format. Thus, a large amount of information is reduced to one or two displays which are stored for later retrieval and modification. The design manager and leaders of the design teams then have a visual display of the design problem and the intricate interactions among the different modules. The design manager could save a substantial

  16. DEMAID - A DESIGN MANAGER'S AID FOR INTELLIGENT DECOMPOSITION (SUN VERSION)

    Science.gov (United States)

    Rogers, J. L.

    1994-01-01

    Many engineering systems are large and multi-disciplinary. Before the design of new complex systems such as large space platforms can begin, the possible interactions among subsystems and their parts must be determined. Once this is completed the proposed system can be decomposed to identify its hierarchical structure. DeMAID (A Design Manager's Aid for Intelligent Decomposition) is a knowledge-based system for ordering the sequence of modules and identifying a possible multilevel structure for the design problem. DeMAID displays the modules in an N x N matrix format (called a design structure matrix) where a module is any process that requires input and generates an output. (Modules which generate an output but do not require an input, such as an initialization process, are also acceptable.) Although DeMAID requires an investment of time to generate and refine the list of modules for input, it could save a considerable amount of money and time in the total design process, particularly in new design problems where the ordering of the modules has not been defined. The decomposition of a complex design system into subsystems requires the judgement of the design manager. DeMAID reorders and groups the modules based on the links (interactions) among the modules, helping the design manager make decomposition decisions early in the design cycle. The modules are grouped into circuits (the subsystems) and displayed in an N x N matrix format. Feedback links, which indicate an iterative process, are minimized and only occur within a subsystem. Since there are no feedback links among the circuits, the circuits can be displayed in a multilevel format. Thus, a large amount of information is reduced to one or two displays which are stored for later retrieval and modification. The design manager and leaders of the design teams then have a visual display of the design problem and the intricate interactions among the different modules. The design manager could save a substantial

  17. Computational thermodynamics aided design of novel ferritic alloys

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Ying [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Chen, Tianyi [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Tan, Lizhen [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

    2016-06-30

    With the aid of computational thermodynamics, Ni was identified to suppress the liquidus temperature of Fe2Zr and four Fe-Cr-Ni-Zr alloys were designed to study the Ni effect on the phase stability of Fe2Zr laves_phase. These alloys were fabricated through traditional arc-metling, followed by annealing at 1000 C for 336 hours and 700 C for 1275 hours. The microstructure were examined and characterized by SEM BSE image, EDS compositional mapping and point scan, XRD and TEM analysis. The major results were summarized below: 1)For investigated alloys with 12wt% Cr, 3~6wt% Zr and 3~9 wt%Ni, the phases in equilibrium with the BCC phase are C15_Laves phase, Fe23Zr6 phase. The volume fraction of intermetallic phases increases with Ni and Zr contents. 2)Instead of (Fe,Cr)2Zr C14_Laves phase, Ni stabilizes the C15_Laves structure in Fe-Cr-Ni-Zr alloys by substituting Fe and Cr atoms with Ni atoms in the first sublattice. 3)Fe23Zr6, that is metastable in the Fe-Cr-Zr ternary, is also stabilized by Ni addition. 4)Ni7Zr2 phase was observed in samples with high Ni/Zr ratio. Extensive solubility of Fe was identified in the phase. The microstructural and composition results obtained from this study will be incorportated into the the Fe-Cr-Ni-Zr database. The current samples will be subjected to ion irradiaition to be compared with those results for Fe-Cr-Zr alloys. Additional alloys will be designed to form (Fe,Cr,Ni)2Zr nanoprecipitates for further studies.

  18. Computational thermodynamics aided design of novel ferritic alloys

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Ying [ORNL; Tan, Lizhen [ORNL

    2016-07-01

    With the aid of computational thermodynamics, Ni was identified to suppress the liquidus temperature of Fe2Zr and four Fe-Cr-Ni-Zr alloys were designed to study the Ni effect on the phase stability of Fe2Zr laves_phase. These alloys were fabricated through traditional arc-metling, followed by annealing at 1000 C for 336 hours and 700 C for 1275 hours. The microstructure were examined and characterized by SEM BSE image, EDS compositional mapping and point scan, XRD and TEM analysis. The major results were summarized below: 1)For investigated alloys with 12wt% Cr, 3~6wt% Zr and 3~9 wt%Ni, the phases in equilibrium with the BCC phase are C15_Laves phase, Fe23Zr6 phase. The volume fraction of intermetallic phases increases with Ni and Zr contents. 2)Instead of (Fe,Cr)2Zr C14_Laves phase, Ni stabilizes the C15_Laves structure in Fe-Cr-Ni-Zr alloys by substituting Fe and Cr atoms with Ni atoms in the first sublattice. 3)Fe23Zr6, that is metastable in the Fe-Cr-Zr ternary, is also stabilized by Ni addition. 4)Ni7Zr2 phase was observed in samples with high Ni/Zr ratio. Extensive solubility of Fe was identified in the phase. The microstructural and composition results obtained from this study will be incorportated into the the Fe-Cr-Ni-Zr database. The current samples will be subjected to ion irradiaition to be compared with those results for Fe-Cr-Zr alloys. Additional alloys will be designed to form (Fe,Cr,Ni)2Zr nanoprecipitates for further studies.

  19. 33 CFR 66.05-100 - Designation of navigable waters as State waters for private aids to navigation.

    Science.gov (United States)

    2010-07-01

    ... as State waters for private aids to navigation. 66.05-100 Section 66.05-100 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY AIDS TO NAVIGATION PRIVATE AIDS TO NAVIGATION State Aids to Navigation § 66.05-100 Designation of navigable waters as State waters for private aids...

  20. Automatic Extraction of Three Dimensional Prismatic Machining Features from CAD Model

    Directory of Open Access Journals (Sweden)

    B.V. Sudheer Kumar

    2011-12-01

    Full Text Available Machining features recognition provides the necessary platform for the computer aided process planning (CAPP and plays a key role in the integration of computer aided design (CAD and computer aided manufacturing (CAM. This paper presents a new methodology for extracting features from the geometrical data of the CAD Model present in the form of Virtual Reality Modeling Language (VRML files. First, the point cloud is separated into the available number of horizontal cross sections. Each cross section consists of a 2D point cloud. Then, a collection of points represented by a set of feature points is derived for each slice, describing the cross section accurately, and providing the basis for a feature-extraction. These extracted manufacturing features, gives the necessary information regarding the manufacturing activities tomanufacture the part. Software in Microsoft Visual C++ environment is developed to recognize the features, where geometric information of the part isextracted from the CAD model. By using this data, anoutput file i.e., text file is generated, which gives all the machinable features present in the part. This process has been tested on various parts and successfully extracted all the features

  1. Gear Transmission Parameter Design CAD Technology Research and Realization%齿轮传动参数设计CAD技术研究及实现

    Institute of Scientific and Technical Information of China (English)

    唐忠

    2013-01-01

    Design is the process of decision,the conception of the persons becomes the graphics or information that others can understand,to ensure the correct manufacturing.In the design,gears are the general mechanical parts.This paper proposes the gear transmission parametric design.The tables and the charts programming method is used to process a large number of table and line graph data in mechanical design.To avoid the tedious manual calculations,the relevant reference books or manuals are searched to achieve the specification and standardization of the design calculation value and Visual Basic6.0 visual interface design method is used to realize the gear transmission parametric CAD system development.%设计是决断的过程,将人的构思变成他人能理解的图形或信息,保证能正确制造.针对齿轮是机械设计中的通用零件,提出了齿轮传动参数化设计.采用数表和图样的程序化方法,对机械设计中大量的数表和图样进行数据处理.避免了在手工计算时从有关参考书或手册中去查找的繁琐,做到了设计计算值规范化和标准化.利用Visual Basic6.0的可视化界面设计方法,实现了齿轮传动的参数化CAD系统开发.

  2. Innovative methods of TRIZ-based flexibility design and CAD welding technology%TRIZ及CAD的焊接工艺的创新方法

    Institute of Scientific and Technical Information of China (English)

    于慧伶; 崔姗姗; 陈广胜; 范德林

    2016-01-01

    随着微机电系统、TRIZ和CAD tools的迅速发展,MEMS器件可以经济高效的设计和生产出来.柔性设计被越来越多地应用到微型电子器件中,可以解决MEMS器件在封装过程中出现的问题.在MEMS器件封装、焊接过程中,由于芯片材料和衬底材料之间热膨胀系数的不匹配,导致在外界温度变化时的应力释放过多,进而造成电子封装偏差.这里以红外遥感器的芯片为研究对象,提出了基于TRIZ 的柔性设计创新方法及CAD焊接工艺的创新方法,用冲突矩阵表达冲突参数和解决原理间的关系,据此得出焊接工艺问题的一般解.经过分析得出,增加芯片折叠长度和减少折叠间距可以解决LED芯片变形问题,进而解决红外摄像机寿命短的问题.这一方法的提出,能够促进倒装焊接技术的发展,继而推动TRIZ理论在林业装备的进一步应用.%With the rapid development of MEMS,TRIZ and CAD tools,the MEMS devices can be designed and produced with low cost and high efficiency. The flexibility design has been widely used in microelectronic devices,which can solve the problem occurring in packaging process of the MEMS devices. In packaging and welding process of the MEMS devices,since the coefficient of thermal expansion between the chip material and substrate material is mismatched,which can cause more stress relief when the external temperature changes,so the electronic packaging deviation will be generated. The innovative methods of TRIZ-based flexibility design and CAD welding technology are proposed by taking the chip of infrared remote sensor as the re-search object,in which the conflict matrix is used to express the relationship between the conflict parameter and resolution prin-ciple,so the general solution of the welding technology problem is obtained. The analysis shows that the LED chip deformation problem can be solved by adding the chip folding length and decreasing the folding distance,and then the

  3. PUZZLE - A program for computer-aided design of printed circuit artwork

    Science.gov (United States)

    Harrell, D. A. W.; Zane, R.

    1971-01-01

    Program assists in solving spacing problems encountered in printed circuit /PC/ design. It is intended to have maximum use for two-sided PC boards carrying integrated circuits, and also aids design of discrete component circuits.

  4. Application of AutoCAD Civil 3D in Design of Water Resources Project%AutoCAD Civil 3D在新疆某水利工程设计中的应用

    Institute of Scientific and Technical Information of China (English)

    郝永志

    2014-01-01

    With example of the model building of one earthrock dam in Xinjiang, application of Civil 3D in aspect of model building of dam body in water recourses project is introduced in terms of terrain curve surface generation, dam slope formation, slope excavation, and earthwork calculation, etc.3D model effect of dam body is visually displayed with contribution of the functions of 3D model building.Ad-vantages and prospects of AutoCAD Civil 3D in model building of dam body are summarized.%以新疆某土石坝建模为例,从地形曲面生成、大坝主体放坡、边坡开挖、土方量计算等方面介绍了Civil 3D在水利工程中坝体建模方面的应用,借助Civil 3D三维建模方面的功能,直观展示坝体三维模型效果。总结了AutoCAD Civil 3D在坝体建模中的主要优点和在水利工程中的应用前景。

  5. Computer Aided Design of Polygalacturonase II from Aspergillus niger

    Directory of Open Access Journals (Sweden)

    Ibrahim Ali Noorbatcha

    2011-12-01

    Full Text Available Pectin is a complex polysaccharide found in the cell walls of plants and consisting mainly of esterified D-galacturonic acid resides in α-(1-4 chain. In production of fruit juice, pectin contributes to fruit juice viscosity, thereby reducing the juice production and increasing the filtration time. Polygalacturonase improves the juice production process by rapid degradation of pectin. In this project we have designed a novel polygalacturonase enzyme using computer aided design approaches. The three dimension structure of polygalacturonase is first modeled on the basis of the known crystal structure. The active site in this enzyme is identified by manual and automated docking methods. Lamarckian genetic algorithm is used for automated docking and the active site is validated by comparing with existing experimental data. This is followed by in silico mutations of the enzymes and the automated docking process is repeated using the mutant enzymes. The strength of the binding of the ligands inside the active site is evaluated by computing the binding score using Potential Mean Force (PMF method. The in silico mutations R256Q and K258N are found to decrease the binding strength of the ligand at the active site, indicating lowering of enzyme activity, which is consistent with the experimental results. Hence in silico mutations can be used to design new polygalacturonase enzymes with improved enzyme activity.ABSTRAK: Pektin adalah polisakarida kompleks yang terdapat di dalam dinding sel tumbuhan dan sebahagian besarnya terdiri daripada asid D-galakturonik terester yang ditemui di dalam rantaian α-(1-4. Dalam penghasilan jus buah-buahan, pektin menyumbang dalam kepekatan jus buah-buahan, di mana ia mengurangkan penghasilan jus dan menambahkan masa penapisan. Poligalakturonase meningkatkan proses penghasilan jus dengan pemecahan pektin dengan cepat. Dalam projek ini, kami telah merangka satu enzim poligalakturonase baru dengan menggunakan pendekatan reka

  6. Annotation and Retrieval System of CAD Models Based on Functional Semantics

    Institute of Scientific and Technical Information of China (English)

    WANG Zhansong; TIAN Ling; DUAN Wenrui

    2014-01-01

    CAD model retrieval based on functional semantics is more significant than content-based 3D model retrieval during the mechanical conceptual design phase. However, relevant research is still not fully discussed. Therefore, a functional semantic-based CAD model annotation and retrieval method is proposed to support mechanical conceptual design and design reuse, inspire designer creativity through existing CAD models, shorten design cycle, and reduce costs. Firstly, the CAD model functional semantic ontology is constructed to formally represent the functional semantics of CAD models and describe the mechanical conceptual design space comprehensively and consistently. Secondly, an approach to represent CAD models as attributed adjacency graphs(AAG) is proposed. In this method, the geometry and topology data are extracted from STEP models. On the basis of AAG, the functional semantics of CAD models are annotated semi-automatically by matching CAD models that contain the partial features of which functional semantics have been annotated manually, thereby constructing CAD Model Repository that supports model retrieval based on functional semantics. Thirdly, a CAD model retrieval algorithm that supports multi-function extended retrieval is proposed to explore more potential creative design knowledge in the semantic level. Finally, a prototype system, called Functional Semantic-based CAD Model Annotation and Retrieval System(FSMARS), is implemented. A case demonstrates that FSMARS can successfully botain multiple potential CAD models that conform to the desired function. The proposed research addresses actual needs and presents a new way to acquire CAD models in the mechanical conceptual design phase.

  7. Foreign Aid Designed to Diminish Terrorist Atrocities can Increase Them

    OpenAIRE

    Spagat, M; Mandler, M.

    2004-01-01

    A domestic power faces an enemy and commits terrorist atrocities to increase the liklihood of victory. A foreign patron can grant aid to the power but prefers fewer or no atrocities. The domestic power responds by acquiescing in the creation of uncontrollable paramilitaries that commit even more atrocities. Once the paramilitaries are set up, aid flows and the atrocity level is high. Now suppose the foreign patron is uncertin whether the domextic power can control the paramilitaries. At a poo...

  8. Foreign Aid Designed to Diminish Terrorist Atrocities can Increase Them

    OpenAIRE

    Mandler, Michael; Spagat, Michael

    2003-01-01

    A domestic power faces an enemy and commits terrorist atrocities to increase the likelihood of victory. A foreign patron can grant aid to the power but prefers fewer or no atrocities. The domestic power responds by acquiescing in the creation of uncontrollable paramilitaries that commit even more atrocities. Once the paramilitaries are set up, aid flows and the atrocity level is high. Now suppose the foreign patron is uncertain whether the domestic power can control the paramilitaries. At a p...

  9. CAD/CAE system for the ring planetary reducer with small tooth number difference

    Institute of Scientific and Technical Information of China (English)

    谢永春; QI; Shifeng; 等

    2002-01-01

    A CAD/CAE system of the ring-type planetary reducer with small tooth number difference is presented.It is a parameterized CAD/CAE system adopting the object-oriented technique and comprising in itself the geometric feature database(including the modules of ring-plates with ineer te4eth,eccentric shaft modules and output shaft modules),standard componentdatabase and material database.In cdomparison with design by handwork,this computer aided design and analysis system has the advantages of improved quality,shortened design period and reduced cost.The reliability of the system has been verified by a illustrative example.

  10. AutoCAD 2012 and AutoCAD LT 2012 No Experience Required

    CERN Document Server

    Gladfelter, Donnie

    2011-01-01

    The perfect step-by-step introduction to Autodesk's powerful architectural design software With this essential guide, you'll learn how to plan, develop, document, and present a complete AutoCAD project by building a summer cabin from start to finish. You can follow each step sequentially or jump in at any point by downloading the drawing files from the book's companion web site. You'll also master all essential AutoCAD features, get a thorough grounding in the basics, learn the very latest industry standards and techniques, and quickly become productive with AutoCAD 2012.Features concise expla

  11. A 3D computer-aided design system applied to diagnosis and treatment planning in orthodontics and orthognathic surgery.

    Science.gov (United States)

    Motohashi, N; Kuroda, T

    1999-06-01

    The purpose of this article is to describe a newly developed 3D computer-aided design (CAD) system for the diagnostic set-up of casts in orthodontic diagnosis and treatment planning, and its preliminary clinical applications. The system comprises a measuring unit which obtains 3D information from the dental model using laser scanning, and a personal computer to generate the 3D graphics. When measuring the 3D shape of the model, to minimize blind sectors, the model is scanned from two different directions with the slit-ray laser beam by rotating the mounting angle of the model on the measuring device. For computed simulation of tooth movement, the representative planes, defined by the anatomical reference points, are formed for each individual tooth and are arranged along a guideline descriptive of the individual arch form. Subsequently, the 3D shape is imparted to each of the teeth arranged on the representative plane to form an arrangement of the 3D profile. When necessary, orthognathic surgery can be simulated by moving the mandibular dental arch three-dimensionally to establish the optimum occlusal relationship. Compared with hand-made set-up models, the computed diagnostic cast has advantages such as high-speed processing and quantitative evaluation on the amount of 3D movement of the individual tooth relative to the craniofacial plane. Trial clinical applications demonstrated that the use of this system facilitated the otherwise complicated and time-consuming mock surgery for treatment planning in orthognathic surgery.

  12. IPAD 2: Advances in Distributed Data Base Management for CAD/CAM

    Science.gov (United States)

    Bostic, S. W. (Compiler)

    1984-01-01

    The Integrated Programs for Aerospace-Vehicle Design (IPAD) Project objective is to improve engineering productivity through better use of computer-aided design and manufacturing (CAD/CAM) technology. The focus is on development of technology and associated software for integrated company-wide management of engineering information. The objectives of this conference are as follows: to provide a greater awareness of the critical need by U.S. industry for advancements in distributed CAD/CAM data management capability; to present industry experiences and current and planned research in distributed data base management; and to summarize IPAD data management contributions and their impact on U.S. industry and computer hardware and software vendors.

  13. Multilateral Aid | L’aide multilatérale

    Directory of Open Access Journals (Sweden)

    2012-05-01

    Full Text Available Bilateral and Multilateral Aid, DAC Members, 1960–2010 (in million USD constant, 2009Aide bilatérale et multilatérale des pays membres du CAD, 1960-2010 (en millions USD constants de 2009­Bilateral and Multilateral Aid by Recipient Region, DAC Members, 2008 (in percentage of total aid by RegionAide bilatérale et multilatérale des pays membres du CAD par region de destination, 2008 (en pourcentage de l’aide totale par régionSources: OECD (2010 2010 DAC Report on Multilateral Aid (Paris: O...

  14. CAD in questions/answers

    Energy Technology Data Exchange (ETDEWEB)

    Boyer, Bruno [Cabinet de Radiologie, 6, place d' Italie, 75013 Paris (France)], E-mail: bboyer6120@aol.com; Balleyguier, Corinne [Service de Radiodiagnostic, Institut Gustave Roussy, 94805 Villejuif (France); Granat, Olivier; Pharaboz, Christian [Cabinet de Radiologie, 6, place d' Italie, 75013 Paris (France)

    2009-01-15

    Generalization of breast screening programs requires an efficient double reading of the mammograms, which allows reduction of false-negative rate, but might be difficult to organize. CAD (Computed Assisted Diagnosis) is dramatically improving and is able to detect suspicious mammographic lesions, either suspicious microcalcifications, masses or architectural distorsions. CAD mammography might complete or substitute to 'human' double reading. The aim of this review is to describe major CAD systems commercially available, working of CAD and to present principal results of CAD mammography. Specially, place of CAD within breast screening program, according to the results of recent prospective studies will be discussed.

  15. Formal Management of CAD/CAM Processes

    Science.gov (United States)

    Kohlhase, Michael; Lemburg, Johannes; Schröder, Lutz; Schulz, Ewaryst

    Systematic engineering design processes have many aspects in common with software engineering, with CAD/CAM objects replacing program code as the implementation stage of the development. They are, however, currently considerably less formal. We propose to draw on the mentioned similarities and transfer methods from software engineering to engineering design in order to enhance in particular the reliability and reusability of engineering processes. We lay out a vision of a document-oriented design process that integrates CAD/CAM documents with requirement specifications; as a first step towards supporting such a process, we present a tool that interfaces a CAD system with program verification workflows, thus allowing for completely formalised development strands within a semi-formal methodology.

  16. 基于AutoCAD的箱包结构设计插件的研发与应用%Research on the Box Structure Design Plug-in Based on the AutoCAD and Its Application Prospect

    Institute of Scientific and Technical Information of China (English)

    王立新; 邓星亮; 周喜旺; 周意斐

    2013-01-01

    Application effect and application technology of softwares for different case and bag design were compared. The advantages of AutoCAD for case and bag structural design were analyzed. The feasibility of AutoCAD plug-in development and its application prospects in case and bag design were presented in details.%比较研究了现行箱包设计软件的应用现状和应用技术,分析了AutoCAD在箱包结构设计中运用的优势,详细论述了AutoCAD插件开发的可行性及在箱包设计中的应用前景.

  17. Injection Mold Design and Manufacturing of Electric Mosquito-Repellent Incense Cover based on CAD/CAE/CAM%基于CAD/CAE/CAM的电蚊香盖注塑模设计与制造

    Institute of Scientific and Technical Information of China (English)

    葛茂忠; 项建云

    2014-01-01

    以电纹香盖为研究对象,采用UG软件进行产品三维建模和注塑模设计;采用CAE技术对产品成型过程进行模拟分析,获得了优化的成型方案和工艺参数;采用UG软件对成型零件进行数控自动编程.实践证明:CAD/CAE/CAM技术的集成,能够有效提高模具设计质量,缩短模具开发周期,降低开发成本.

  18. Full-mouth rehabilitation with monolithic CAD/CAM-fabricated hybrid and all-ceramic materials: A case report and 3-year follow up.

    Science.gov (United States)

    Selz, Christian F; Vuck, Alexander; Guess, Petra C

    2016-02-01

    Esthetic full-mouth rehabilitation represents a great challenge for clinicians and dental technicians. Computer-aided design/ computer-assisted manufacture (CAD/CAM) technology and novel ceramic materials in combination with adhesive cementation provide a reliable, predictable, and economic workflow. Polychromatic feldspathic CAD/CAM ceramics that are specifically designed for anterior indications result in superior esthetics, whereas novel CAD/CAM hybrid ceramics provide sufficient fracture resistance and adsorption of the occlusal load in posterior areas. Screw-retained monolithic CAD/CAM lithium disilicate crowns (ie, hybrid abutment crowns) represent a reliable and time- and cost-efficient prosthetic implant solution. This case report details a CAD/CAM approach to the full-arch rehabilitation of a 65-year-old patient with toothand implant-supported restorations and provides an overview of the applied CAD/CAM materials and the utilized chairside intraoral scanner. The esthetics, functional occlusion, and gingival and peri-implant tissues remained stable over a follow-up period of 3 years. No signs of fractures within the restorations were observed. PMID:26417616

  19. A new concept and preliminary study of wearable CAD

    International Nuclear Information System (INIS)

    In this paper, a novel application of computer-aided diagnosis (CAD) system, namely wearable CAD, was proposed. As a preliminary study, we investigated differences of CAD performances, between original CT images and pictures taken by digital camera. Twenty cases of thoracic CT with 849 slice images were used in the study. Those CT images were displayed on the monitor, and taken by a digital camera. Then, the acquired pictures were input to the CAD. The CAD scheme consisted of three processes, extraction of pulmonary regions, detection of nodule candidates and reduction of false positives. Threshold and morphological techniques were used for extraction of pulmonary regions. Detection of nodule candidates was performed by using quoit filter, template matching and selective enhancement filter. In the reduction of false positives, thirteen features were calculated and used for discrimination by Maharanobis distance. CAD performances of both cases had no critical difference, using original CT images and taken pictures as input of the CAD. When true-positive rate was 1.0, the number of false positives per case was approximately in the range of 30-40. The results indicate that input system of wearable CAD is realizable. (author)

  20. IM2CAD

    OpenAIRE

    Izadinia, Hamid; Shan, Qi; Seitz, Steven M.

    2016-01-01

    Given a single photo of a room and a large database of furniture CAD models, our goal is to reconstruct a scene that is as similar as possible to the scene depicted in the photograph, and composed of objects drawn from the database. We present a completely automatic system to address this IM2CAD problem that produces high quality results on challenging imagery from real estate web sites. Our approach iteratively optimizes the placement and scale of objects in the room to best match scene rend...

  1. Computer Aided Design of The Cooling System for Plastic Injection Molds

    Directory of Open Access Journals (Sweden)

    Hakan GÜRÜN

    2009-02-01

    Full Text Available The design of plastic injection molds and their cooling systems affect both the dimension, the shape, the quality of a plastic part and the cycle time of process and the cost of mold. In this study, the solid model design of a plastic injection mold and the design of cooling sysytem were possibly carried out without the designer interaction. Developed program permited the use of three types of the cooling system and the different cavity orientations and the multible plastic part placement into the mold cores. The program which was developed by using Visual LISP language and the VBA (Visual BASIC for Application modules, was applicated in the AutoCAD software domain. Trial studies were presented that the solid model design of plastic injection molds and the cooling systems increased the reliability, the flexibility and the speed of the design.

  2. CAD/CAM Helps Build Better Bots: High-Tech Design and Manufacture Draws Engineering-Oriented Students

    Science.gov (United States)

    Van Name, Barry

    2012-01-01

    There is a battlefield where no quarter is given, no mercy shown, but not a single drop of blood is spilled. It is an arena that witnesses the bringing together of high-tech design and manufacture with the outpouring of brute force, under the remotely accessed command of some of today's brightest students. This is the world of battling robots, or…

  3. Integration of Radio—Frequency Identification and 4D CAD in Construction Management

    Institute of Scientific and Technical Information of China (English)

    HU Wenfa

    2008-01-01

    In order to increase the productivity of construction industry,emerging technologies have been constantly introduced and applied in this traditional industry by pilot researchers.This paper provides an in-tegrated model of radio-frequency identification (RFID) and four-dimensional Computer-Aided Design (4D CAD) in construction management.RFID involves the use of tags that collect data and transmit data.RFID can collect data by radio waves instead of light waves.RFID technology is surpassing barcode technology where light waves are easily blocked and barcode labels are easy to fall off or become unreadable due to dust,dirt,or other contaminants.4D CAD which involves 3D construction models and construction sched-ules presents visualized construction process.Integration of RFID and 4D CAD in this paper built a dynamic constmction management and control system which would reduce the time of capturing data on site and control quality of construction materials efficiently.Pilot test result shows that a construction manager can easily understand how and what a complicated construction project will be accomplished.Although further analysis is necessary,RFID and 4D CAD show promises of being a beneficial technology in construction management.

  4. Coherent Division of Labor in a Three-Dimensional CAD New Product Development Environment

    Directory of Open Access Journals (Sweden)

    Christoph STAITA

    2014-11-01

    Full Text Available This experimental field study examines the influence of a variable ratio between engineers and technical draftspeople in New Product Development (NewPD Teams in a three-dimensional CAD construction environment on economic and socio-psychological efficiency. With the implementation of the 3D CAD software (Three Dimensional Computer Aided Design the world of engineers seemed to become a completely new and fascinating one in which the engineer is a 100% creative part in the NewPD process of an innovative company – with all supporting activities taken over by marvellous software, automatically and completely. Technical draftspeople who did supporting activities so far declined rapidly. The literature review shows the improvements by 3D CAD, the areas where the SW is over-challenged and a discussion of division of labor in detail. The Causal Model for socio economic analysis shows possible cause-effect relations between different team constellations in NewPD teams under 3D CAD conditions.

  5. Predictable Restorative Work Flow for Computer-Aided Design/Computer-Aided Manufacture-Fabricated Ceramic Veneers Utilizing a Virtual Smile Design Principle.

    Science.gov (United States)

    Lin, W S; Zandinejad, A; Metz, M J; Harris, B T; Morton, D

    2015-01-01

    The purpose of this case report was to present the use of a contemporary digital photograph-assisted virtual smile design principle, an intraoral digital impression, and computer-aided design/computer-aided manufacture-fabricated lithium disilicate ceramic veneers to treat a patient with esthetic needs in the maxillary anterior region. By using the proposed digital restorative work flow, this case report demonstrated an effective communication pathway between the patient, clinician, and dental laboratory technician. Effective communication can help to achieve a more predictable and satisfactory esthetic outcome.

  6. Digital breast tomosynthesis: application of 2D digital mammography CAD to detection of microcalcification clusters on planar projection image

    Science.gov (United States)

    Samala, Ravi K.; Chan, Heang-Ping; Lu, Yao; Hadjiiski, Lubomir; Wei, Jun; Helvie, Mark

    2015-03-01

    Computer-aided detection (CAD) has the potential to aid radiologists in detection of microcalcification clusters (MCs). CAD for digital breast tomosynthesis (DBT) can be developed by using the reconstructed volume, the projection views or other derivatives as input. We have developed a novel method of generating a single planar projection (PPJ) image from a regularized DBT volume to emphasize the high contrast objects such as microcalcifications while removing the anatomical background and noise. In this work, we adapted a CAD system developed for digital mammography (CADDM) to the PPJ image and compared its performance with our CAD system developed for DBT volumes (CADDBT) in the same set of cases. For microcalcification detection in the PPJ image using the CADDM system, the background removal preprocessing step designed for DM was not needed. The other methods and processing steps in the CADDM system were kept without modification while the parameters were optimized with a training set. The linear discriminant analysis classifier using cluster based features was retrained to generate a discriminant score to be used as decision variable. For view-based FROC analysis, at 80% sensitivity, an FP rate of 1.95/volume and 1.54/image were achieved, respectively, for CADDBT and CADDM in an independent test set. At a threshold of 1.2 FPs per image or per DBT volume, the nonparametric analysis of the area under the FROC curve shows that the optimized CADDM for PPJ is significantly better than CADDBT. However, the performance of CADDM drops at higher sensitivity or FP rate, resulting in similar overall performance between the two CAD systems. The higher sensitivity of the CADDM in the low FP rate region and vice versa for the CADDBT indicate that a joint CAD system combining detection in the DBT volume and the PPJ image has the potential to increase the sensitivity and reduce the FP rate.

  7. TinkerCell: modular CAD tool for synthetic biology

    Directory of Open Access Journals (Sweden)

    Bergmann Frank T

    2009-10-01

    Full Text Available Abstract Background Synthetic biology brings together concepts and techniques from engineering and biology. In this field, computer-aided design (CAD is necessary in order to bridge the gap between computational modeling and biological data. Using a CAD application, it would be possible to construct models using available biological "parts" and directly generate the DNA sequence that represents the model, thus increasing the efficiency of design and construction of synthetic networks. Results An application named TinkerCell has been developed in order to serve as a CAD tool for synthetic biology. TinkerCell is a visual modeling tool that supports a hierarchy of biological parts. Each part in this hierarchy consists of a set of attributes that define the part, such as sequence or rate constants. Models that are constructed using these parts can be analyzed using various third-party C and Python programs that are hosted by TinkerCell via an extensive C and Python application programming interface (API. TinkerCell supports the notion of a module, which are networks with interfaces. Such modules can be connected to each other, forming larger modular networks. TinkerCell is a free and open-source project under the Berkeley Software Distribution license. Downloads, documentation, and tutorials are available at http://www.tinkercell.com. Conclusion An ideal CAD application for engineering biological systems would provide features such as: building and simulating networks, analyzing robustness of networks, and searching databases for components that meet the design criteria. At the current state of synthetic biology, there are no established methods for measuring robustness or identifying components that fit a design. The same is true for databases of biological parts. TinkerCell's flexible modeling framework allows it to cope with changes in the field. Such changes may involve the way parts are characterized or the way synthetic networks are modeled

  8. Beginning AutoCAD 2002

    CERN Document Server

    McFarlane, Bob

    2002-01-01

    New features in AutoCAD 2002 are covered in this book, making it a useful refresher course for anyone using AutoCAD at this level, and upgrading to the new software release. The material in the book is also relevant to anyone using other recent releases, including, AutoCAD 2000.

  9. AutoCAD 2014 and AutoCAD LT 2014

    CERN Document Server

    Gladfelter, Donnie

    2013-01-01

    A step-by-step tutorial introduction to AutoCAD As the only book to teach AutoCAD using a continuous tutorial which allows you to follow along sequentially or jump in at any exercise by downloading the drawing files, this Autodesk Official Press book is ideal for the AutoCAD novice. Industry expert and AutoCAD guru Donnie Gladfelter walks you through the powerful features of AutoCAD, provides you with a solid foundation of the basics, and shares the latest industry standards and techniques. The hands-on tutorial project inspired by real-world workflows that runs throughout the book

  10. From Artisanal to CAD-CAM Blocks: State of the Art of Indirect Composites.

    Science.gov (United States)

    Mainjot, A K; Dupont, N M; Oudkerk, J C; Dewael, T Y; Sadoun, M J

    2016-05-01

    Indirect composites have been undergoing an impressive evolution over the last few years. Specifically, recent developments in computer-aided design-computer-aided manufacturing (CAD-CAM) blocks have been associated with new polymerization modes, innovative microstructures, and different compositions. All these recent breakthroughs have introduced important gaps among the properties of the different materials. This critical state-of-the-art review analyzes the strengths and weaknesses of the different varieties of CAD-CAM composite materials, especially as compared with direct and artisanal indirect composites. Indeed, new polymerization modes used for CAD-CAM blocks-especially high temperature (HT) and, most of all, high temperature-high pressure (HT-HP)-are shown to significantly increase the degree of conversion in comparison with light-cured composites. Industrial processes also allow for the augmentation of the filler content and for the realization of more homogeneous structures with fewer flaws. In addition, due to their increased degree of conversion and their different monomer composition, some CAD-CAM blocks are more advantageous in terms of toxicity and monomer release. Finally, materials with a polymer-infiltrated ceramic network (PICN) microstructure exhibit higher flexural strength and a more favorable elasticity modulus than materials with a dispersed filler microstructure. Consequently, some high-performance composite CAD-CAM blocks-particularly experimental PICNs-can now rival glass-ceramics, such as lithium-disilicate glass-ceramics, for use as bonded partial restorations and crowns on natural teeth and implants. Being able to be manufactured in very low thicknesses, they offer the possibility of developing innovative minimally invasive treatment strategies, such as "no prep" treatment of worn dentition. Current issues are related to the study of bonding and wear properties of the different varieties of CAD-CAM composites. There is also a crucial

  11. From Bad to CAD: Maintaining Records of Maintenance Projects.

    Science.gov (United States)

    Shea, Diane C.

    1994-01-01

    A computer-assisted design (CAD) software program is used in a Connecticut school district to graphically provide information on maintenance projects by school and category of project over time. CAD supplies a computerized building plan, a "foot-print," used as a recordkeeping system for maintenance projects. (MLF)

  12. CAD/CAM: Practical and Persuasive in Canadian Schools

    Science.gov (United States)

    Willms, Ed

    2007-01-01

    Chances are that many high school students would not know how to use drafting instruments, but some might want to gain competence in computer-assisted design (CAD) and possibly computer-assisted manufacturing (CAM). These students are often attracted to tech courses by the availability of CAD/CAM instructions, and many go on to impress employers…

  13. Forced orthodontic extrusion and use of CAD/CAM for reconstruction of grossly destructed crown: A multidisciplinary approach

    Directory of Open Access Journals (Sweden)

    Rahul Kumar

    2012-01-01

    Full Text Available The aim of this study is to present a report of a case where forced orthodontic extrusion and computer-aided design and computer-aided manufacturing (CAD/CAM technique was used for reconstruction of right maxillary central incisor with grossly destructed crown. Aesthetic rehabilitation of a fractured maxillary right central incisor was performed employing a multidisciplinary approach i.e. conventional endodontic treatment followed by orthodontic extrusion and final restoration using CAD-CAM and one piece milled zirconia post and core with full coverage zirconia crown. After the procedure being completed, periapical radiographs taken at 3 month follow up period demonstrated that the post and core remained well adapted to post space and there was a complete healing of periapical lesion. This technique can provide a complete aesthetic rehabilitation of a grossly destructed tooth without hampering the biological width and thus has a better prognosis.

  14. Forced orthodontic extrusion and use of CAD/CAM for reconstruction of grossly destructed crown: A multidisciplinary approach

    Science.gov (United States)

    Kumar, Rahul; Patil, Suvarna

    2012-01-01

    The aim of this study is to present a report of a case where forced orthodontic extrusion and computer-aided design and computer-aided manufacturing (CAD/CAM) technique was used for reconstruction of right maxillary central incisor with grossly destructed crown. Aesthetic rehabilitation of a fractured maxillary right central incisor was performed employing a multidisciplinary approach i.e. conventional endodontic treatment followed by orthodontic extrusion and final restoration using CAD-CAM and one piece milled zirconia post and core with full coverage zirconia crown. After the procedure being completed, periapical radiographs taken at 3 month follow up period demonstrated that the post and core remained well adapted to post space and there was a complete healing of periapical lesion. This technique can provide a complete aesthetic rehabilitation of a grossly destructed tooth without hampering the biological width and thus has a better prognosis. PMID:22557823

  15. CAD/CAM-designed 3D-printed electroanalytical cell for the evaluation of nanostructured gas-diffusion electrodes

    Science.gov (United States)

    Chervin, Christopher N.; Parker, Joseph F.; Nelson, Eric S.; Rolison, Debra R.; Long, Jeffrey W.

    2016-04-01

    The ability to effectively screen and validate gas-diffusion electrodes is critical to the development of next-generation metal-air batteries and regenerative fuel cells. The limiting electrode in a classic two-terminal device such as a battery or fuel cell is difficult to discern without an internal reference electrode, but the flooded electrolyte characteristic of three-electrode electroanalytical cells negates the prime function of an air electrode—a void volume freely accessible to gases. The nanostructured catalysts that drive the energy-conversion reactions (e.g., oxygen reduction and evolution in the air electrode of metal-air batteries) are best evaluated in the electrode structure as-used in the practical device. We have designed, 3D-printed, and characterized an air-breathing, thermodynamically referenced electroanalytical cell that allows us to mimic the Janus arrangement of the gas-diffusion electrode in a metal-air cell: one face freely exposed to gases, the other wetted by electrolyte.

  16. An overview of interactive computer graphics and its application to computer-aided engineering and design

    International Nuclear Information System (INIS)

    The purpose of this brief birds-eye view of interactive graphics is to list the key ideas, and to show how one of the most important application areas, Computer Aided Engineering/Design takes advantage of it. (orig.)

  17. Computer aided design of microcircuits. Citations from the NTIS data base

    Science.gov (United States)

    Reed, W. E.

    1980-09-01

    Government sponsored research covering the computer aided design, modeling, layout, and packaging of integrated and other microelectronic circuits are cited. Computer programs and the use of computer graphics are included.

  18. 计算机辅助设计与制作一体化玻璃纤维桩核修复漏斗状根管的抗疲劳和抗折性能%Fatigue and fracture resistance of the flared roots restored with computer aided design and computer aided manufacturing glass fiber posts

    Institute of Scientific and Technical Information of China (English)

    李智; 王新知; 高承志; IVO Krejci

    2013-01-01

    To evaluate the fatigue and fracture resistance of the flared roots restored with computer aided design (CAD) and computer aided manufacturing (CAM) glass fiber posts. Methods; In the study, 32 maxillary central incisors with roots longer than 13 mm were selected and their canals were flared, and the roots were allocated into 4 groups ( n = 8 ) by a random number chart: CAD/CAM glass fiber posts, prefabricated quartz fiber posts, cast gold alloy posts, and CAD/CAM zirconia posts. The posts were luted to the roots by resin cement and fabricate zirconia crown for every specimen. An addition-type silicone impression material was used to simulate the periodontal ligament. All the specimens were submitted to 1.2 X 106 cycles loaded with a 49 N force, at 45 degree to the long axis of the teeth simultaneously with 3 000 thermal cycles (5℃-50℃-5℃). After that, the specimens were subjected to a load at a crosshead speed of 1 mm/min in a servo-hydraulic testing machine applied at 45 degree to the long axis of the tooth until fracture. The data were subjected to ANOVA test and the patterns of the failure were examined. Results; After the cycling loading, 4 crowns from prefabricated quartz fiber posts groups were deboned, and no other failure was found after the cycling loading; the fracture strengths of CAD/CAM glass fiber posts group [ (441. 5 ± 103. 2) N] and cast gold alloy posts group [ (462. 9 ± 170.0) N] were higher (F=4.613, P<0.05) than those of CAD/CAM zirconia posts group [ (284.1 ± 99.0) N] and prefabricated quartz fiber posts group [(315. 4 ± 112. 3) N] ; the entire specimens presented unfavorable failures. Conclusion; Although further in vitro and in vivo studies are necessary,the results of this study show that the use of CAD/CAM glass fiber posts and cast gold alloy posts may a-chieve better outcomes in flared roots than that of CAD/CAM zirconia posts and prefabricated quartz fiber posts.%目的:评价计算机辅助设计与制作(computer aided

  19. Clinical and Laboratory Steps for Fabricating a Complete-Arch Fixed Prosthesis Using CAD/CAM.

    Science.gov (United States)

    Keerthi, Senthil; Proussaefs, Periklis; Lozada, Jaime

    2015-01-01

    The fabrication of a full-arch maxillary prosthesis has been associated with several prosthetic complications and difficulties. Even though it has been reported that phonetics, esthetics, and proper lip support are difficult to achieve, there is a scarcity in the literature regarding the clinical and laboratory procedures necessary to minimize these complications. This article provides clinical and laboratory steps that may enable the clinician to achieve more predictable restorative results when using computer-aided design/computer-assisted manufacture (CAD/CAM) to fabricate a full-arch maxillary implant-supported prosthesis. The technique presented here describes the use of an implant-retained diagnostic wax-up that is subsequently duplicated to an interim polymethylmethacrylate prosthesis using CAD/CAM before fabricating the definitive restoration. PMID:26133136

  20. Computer-aided design of bromelain and papain covalent immobilization

    Directory of Open Access Journals (Sweden)

    Bessy Cutiño-Avila

    2014-06-01

    Full Text Available Título en español: Diseño asistido por computadora de la inmovilización covalente de bromelina y papaína.Título corto: Computer-aided design of bromelain and papain. Abstract: Enzymes as immobilized derivatives have been widely used in Food, Agrochemical, Pharmaceutical and Biotechnological industries. Protein immobilization is probably the most used technology to improve the operational stability of these molecules. Bromelain (Ananas comosus and papain (Carica papaya are cystein proteases extensively used as immobilized biocatalyst with several applications in therapeutics, racemic mixtures resolution, affinity chromatography and others industrial scenarios. The aim of this work was to optimize the covalent immobilization of bromelain and papain via rational design of immobilized derivatives strategy (RDID and RDID1.0 program. It was determined the maximum protein quantity to immobilize, the optimum immobilization pH (in terms of functional activity retention, and the most probable configuration of the immobilized derivative and the probabilities of multipoint covalent attachment was also predicted. As support material Glyoxyl-Sepharose CL 4B was used.  The accuracy of RDID1.0 program´s prediction was demonstrated comparing with experimental results. Bromelain and papain immobilized derivatives showed desired characteristics for industrial biocatalysis, such as: elevate pH stability retaining 95% and 100% residual activity at pH 7.0 and 8.0, for bromelain and papain, respectively; high thermal stability at 30 °C retaining 90% residual activity for both immobilized enzymes; a catalytic configuration bonded by immobilization at optimal pH; and the ligand load achieved, ensures the minimization of diffusional restrictions.Key words: bromelain, covalent immobilization, immobilized derivatives, papain, rational design.Resumen: Las enzimas inmovilizadas han sido ampliamente utilizadas en las industrias Alimentaria, Agroquímica, Farmac

  1. Rapid development of auricular prosthesis using CAD and rapid prototyping technologies.

    Science.gov (United States)

    Subburaj, K; Nair, C; Rajesh, S; Meshram, S M; Ravi, B

    2007-10-01

    External ear defects can be corrected by surgery, but this may not be feasible for personal or medical reasons. Reconstructive solutions are a good alternative, but rely on the artistry and availability of the anaplastologist. A semi-automated methodology using computer-aided design (CAD) and rapid prototyping (RP) technologies was developed for auricular prosthesis development, and demonstrated in a real-life case. The correct geometry and position of the prosthesis were ensured by stacking the computed tomography scan images of the contralateral normal ear in reverse order, and joining them using a medical modelling software program. The CAD model of the remnant portion of the defective ear was subtracted from the model of the mirrored contralateral ear, using a haptic CAD system, to obtain the final geometry of the prosthesis. Polymer models were fabricated in RP systems, and used for making a corresponding mould. Medical grade silicone rubber of the appropriate colour was packed into the mould to fabricate the final ear prosthesis and fitted to the deficient side of the patient using medical grade adhesive. The computer-aided methodology gave a high level of accuracy in terms of shape, size and position of the prosthesis, and a significantly shorter lead time compared to the conventional (manual) technique. PMID:17822875

  2. Analytical Design Package (ADP2): A computer aided engineering tool for aircraft transparency design

    Science.gov (United States)

    Wuerer, J. E.; Gran, M.; Held, T. W.

    1994-01-01

    The Analytical Design Package (ADP2) is being developed as a part of the Air Force Frameless Transparency Program (FTP). ADP2 is an integrated design tool consisting of existing analysis codes and Computer Aided Engineering (CAE) software. The objective of the ADP2 is to develop and confirm an integrated design methodology for frameless transparencies, related aircraft interfaces, and their corresponding tooling. The application of this methodology will generate high confidence for achieving a qualified part prior to mold fabrication. ADP2 is a customized integration of analysis codes, CAE software, and material databases. The primary CAE integration tool for the ADP2 is P3/PATRAN, a commercial-off-the-shelf (COTS) software tool. The open architecture of P3/PATRAN allows customized installations with different applications modules for specific site requirements. Integration of material databases allows the engineer to select a material, and those material properties are automatically called into the relevant analysis code. The ADP2 materials database will be composed of four independent schemas: CAE Design, Processing, Testing, and Logistics Support. The design of ADP2 places major emphasis on the seamless integration of CAE and analysis modules with a single intuitive graphical interface. This tool is being designed to serve and be used by an entire project team, i.e., analysts, designers, materials experts, and managers. The final version of the software will be delivered to the Air Force in Jan. 1994. The Analytical Design Package (ADP2) will then be ready for transfer to industry. The package will be capable of a wide range of design and manufacturing applications.

  3. A BIST GENERATOR CAD TOOL FOR NUMERIC INTEGRATED CIRCUITS

    Directory of Open Access Journals (Sweden)

    Chiraz Khedhiri

    2011-06-01

    Full Text Available This paper describes a training and research tool for learning basic issues related to BIST (Built-In Self-Test generator. The main didactic aim of the tool is presenting complicated concepts in a comprehensive graphical and analytical way. The paper describes a computer-aided design (CAD that is used to generate automatically the BIST to any digital circuit. This software technique attempts to reduce the amount of extra hardware and cost of the circuit.In order to make our software being easily available, we used the Java platform, which is supported by most operating systems. The multi-platform JAVA run time environment allows for easy access and usage of the tool.

  4. A deep learning approach to the classification of 3D CAD models

    Institute of Scientific and Technical Information of China (English)

    Fei-wei QIN; Lu-ye LI; Shu-ming GAO; Xiao-ling YANG; Xiang CHEN

    2014-01-01

    Model classification is essential to the management and reuse of 3D CAD models. Manual model classification is laborious and error prone. At the same time, the automatic classification methods are scarce due to the intrinsic complexity of 3D CAD models. In this paper, we propose an automatic 3D CAD model classification approach based on deep neural networks. According to prior knowledge of the CAD domain, features are selected and extracted from 3D CAD models first, and then pre-processed as high dimensional input vectors for category recognition. By analogy with the thinking process of engineers, a deep neural network classifier for 3D CAD models is constructed with the aid of deep learning techniques. To obtain an optimal solution, multiple strategies are appropriately chosen and applied in the training phase, which makes our classifier achieve better per-formance. We demonstrate the efficiency and effectiveness of our approach through experiments on 3D CAD model datasets.

  5. Artificial intelligence and CAD/CAM

    Energy Technology Data Exchange (ETDEWEB)

    Iwata, K.

    1983-10-01

    In recent years CAD/CAM technology has improved industrial productivity. It is a significant step towards the design of the factory of the future. CAD/CAM in conjunction with artificial intelligence will become paramount. Workers in this field are attempting to produce systems of ever-increasing intelligence and independence for everyday use in factories, schools and elsewhere. A computer system which could understand natural language in both spoken and handwritten form and communicate in natural language would have considerable advantage in practical situations over one of the present generation of computers and computer programs. 2 references.

  6. Automated lung segmentation algorithm for CAD system of thoracic CT

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    Objective: To design and test the accuracy and efficiency of our lung segmentation algorithm on thoracic CT image in computer-aided diagnostic (CAD) system, especially on the segmentation between left and right lungs. Methods: We put forward the base frame of our lung segmentation firstly. Then, using optimal thresholding and mathematical morphologic methods, we acquired the rough image of lung segmentation. Finally, we presented a fast self-fit segmentation refinement algorithm, adapting to the unsuccessful left-right lung segmentation of thredsholding. Then our algorithm was used to CT scan images of 30 patients and the results were compared with those made by experts. Results: Experiments on clinical 2-D pulmonary images showed the results of our algorithm were very close to the expert's manual outlines, and it was very effective for the separation of left and right lungs with a successful segmentation ratio 94.8%. Conclusion: It is a practicable fast lung segmentation algorithm for CAD system on thoracic CT image.

  7. Combine Gearbox Aided Design Based on Artificial Neural Networks

    Institute of Scientific and Technical Information of China (English)

    WANG Jin-wu

    2005-01-01

    In the optimum design of the self-propelled combine gearbox, the knowledge of ANN is applied to overcome slow calculation and low design efficiency. We did the normative approach of the charts information ,then solved the difficult problems in the design process and get satisfactory results. We also completed three-dimensional design of the gearbox in order to verify the rationality of the design visually.

  8. Computer-Aided Design Of Turbine Blades And Vanes

    Science.gov (United States)

    Hsu, Wayne Q.

    1988-01-01

    Quasi-three-dimensional method for determining aerothermodynamic configuration of turbine uses computer-interactive analysis and design and computer-interactive graphics. Design procedure executed rapidly so designer easily repeats it to arrive at best performance, size, structural integrity, and engine life. Sequence of events in aerothermodynamic analysis and design starts with engine-balance equations and ends with boundary-layer analysis and viscous-flow calculations. Analysis-and-design procedure interactive and iterative throughout.

  9. The Research of Computer Aided Farm Machinery Designing Method Based on Ergonomics

    Science.gov (United States)

    Gao, Xiyin; Li, Xinling; Song, Qiang; Zheng, Ying

    Along with agricultural economy development, the farm machinery product type Increases gradually, the ergonomics question is also getting more and more prominent. The widespread application of computer aided machinery design makes it possible that farm machinery design is intuitive, flexible and convenient. At present, because the developed computer aided ergonomics software has not suitable human body database, which is needed in view of farm machinery design in China, the farm machinery design have deviation in ergonomics analysis. This article puts forward that using the open database interface procedure in CATIA to establish human body database which aims at the farm machinery design, and reading the human body data to ergonomics module of CATIA can product practical application virtual body, using human posture analysis and human activity analysis module to analysis the ergonomics in farm machinery, thus computer aided farm machinery designing method based on engineering can be realized.

  10. Research on the Procedure for Computer-Aided Pattern Design of Uygur's Flowered Hats

    Directory of Open Access Journals (Sweden)

    Shuxian Liu

    2013-05-01

    Full Text Available Xinjiang Uygur’s flowered hats is famous all over the world, it leads the world of headwear of variou nationalities within China by the variety of styles, the various ways of how to emroider pattern design and exquisite manufacture. It is unusual even in national costumes art of the world. The poupose of this study is to analyze Uygur's headwear, study the rules of Uygur's headwear pattern, analyze the characteristic of the basic pattern, research on the procedure for computer-aided pattern design of Uygur's flowered hat, explore the application of computer-aided design in traditional costume's pattern design and to realize application exploration of computer-aided design in designing of costume and dress adornment.

  11. CAD MOSFET MODEL FOR EPROM CELLS

    OpenAIRE

    Ballay, N.; Baylac, B.

    1988-01-01

    A CAD model of NOS transistor suitable for circuit simulation of an EPROM cell during writing cycle is proposed. This model is as close as possible of physics to allow the designer to evaluate different schemes and changes in the process variables. It is reliable in the breakdown mode too and takes into account the gate current induced by channel hot electrons.

  12. NEXUS/NASCAD- NASA ENGINEERING EXTENDIBLE UNIFIED SOFTWARE SYSTEM WITH NASA COMPUTER AIDED DESIGN

    Science.gov (United States)

    Purves, L. R.

    1994-01-01

    NEXUS, the NASA Engineering Extendible Unified Software system, is a research set of computer programs designed to support the full sequence of activities encountered in NASA engineering projects. This sequence spans preliminary design, design analysis, detailed design, manufacturing, assembly, and testing. NEXUS primarily addresses the process of prototype engineering, the task of getting a single or small number of copies of a product to work. Prototype engineering is a critical element of large scale industrial production. The time and cost needed to introduce a new product are heavily dependent on two factors: 1) how efficiently required product prototypes can be developed, and 2) how efficiently required production facilities, also a prototype engineering development, can be completed. NEXUS extendibility and unification are achieved by organizing the system as an arbitrarily large set of computer programs accessed in a common manner through a standard user interface. The NEXUS interface is a multipurpose interactive graphics interface called NASCAD (NASA Computer Aided Design). NASCAD can be used to build and display two and three-dimensional geometries, to annotate models with dimension lines, text strings, etc., and to store and retrieve design related information such as names, masses, and power requirements of components used in the design. From the user's standpoint, NASCAD allows the construction, viewing, modification, and other processing of data structures that represent the design. Four basic types of data structures are supported by NASCAD: 1) three-dimensional geometric models of the object being designed, 2) alphanumeric arrays to hold data ranging from numeric scalars to multidimensional arrays of numbers or characters, 3) tabular data sets that provide a relational data base capability, and 4) procedure definitions to combine groups of system commands or other user procedures to create more powerful functions. NASCAD has extensive abilities to

  13. PARAMETRIC DESIGN OF DELTA ROBOT

    Directory of Open Access Journals (Sweden)

    Mert Gürgen

    2016-09-01

    Full Text Available This article describes a sophisticated determination and presentation of a workspace volume for a delta robot, with consideration of its kinematic behavior. With the help of theoretical equations, optimization is performed with the aid of the stiffness and dexterity analysis. Theoretical substructure is coded in Matlab and three-dimensional (3D data for delta robot are developed in computer-aided design (CAD environment. In later stages of the project, both 3D and theoretical data are linked together and thus, with the changing design parameter of the robot itself, the Solidworks CAD output adapts and regenerates output with a new set of parameters. To achieve an optimum workspace volume with predefined parameters, a different set of robot parameters are iterated through design optimization in Matlab, and the delta robot design is finalized and illustrated in the 3D CAD environment, Solidworks. This study provides a technical solution to accomplish a generic delta robot with optimized workspace volume.

  14. Computer-Aided Vaccine Design: A Brief Report

    Directory of Open Access Journals (Sweden)

    R Ghasemi Khorasgani

    2012-09-01

    Full Text Available Background: Although the conventional vaccines have been instrumented in the incidence of many infectious diseases, the advances in genetic engineering and bioinformatics have provided the opportunity for developing improved and new vaccines.Methods: Reverse vaccinology was pioneered by a group of researchers investigating development of a vaccine against serogroup B Neisseria meningitidis. Reverse vaccinology analyzes the entire genome of a pathogen with the aid of computational programs to identify potentially antigenic extracellular proteins.Results: Using this method for Neisseria meningitidis genome analysis, 600 secretory or surface-exposed proteins were identified and, subsequently, 350 proteins were expressed and purified. Finally, seven proteins capable of activating the immune system against a range of strains were identified.Conclusion: Improved computational techniques are now able to provide researchers with high-confidence predictions for complex biological characteristics. This will herald a move to computer-aided biotechnology in which time-consuming and expensive large-scale experimental approaches are progressively replaced by functional bioinformatic investigations.

  15. Research on the Architecture of the CAD System of a Magnetic Bearing Based on Pattern-oriented

    Institute of Scientific and Technical Information of China (English)

    CHEN Rui-qing; SUN Yan-hua; CHEN Jian-bin; YU Lie

    2006-01-01

    The architecture of the CAD system of a magnetic bearing is established by using pattern-oriented software architecture.Based on the pipe-filter pattern, all the present resources come from different developing environments, aiding the design of a magnetic bearing system, can be integrated into the system. Replacing the original pipes with database, the concurrent design can be realized in the design process,which changes the serial mode of traditional manufacture.The distributed and heterogeneous design resources can be integrated into the system and shared by importing the broker pattern. Combining pipe-filter pattern with broker pattern, the system is opening and easy to maintain and extend.

  16. Computer Aided Methodology for Simultaneous Synthesis, Design & Analysis of Chemical Products-Processes

    DEFF Research Database (Denmark)

    d'Anterroches, Loïc; Gani, Rafiqul

    2006-01-01

    A new combined methodology for computer aided molecular design and process flowsheet design is presented. The methodology is based on the group contribution approach for prediction of molecular properties and design of molecules. Using the same principles, process groups have been developed...... together with their corresponding flowsheet property models. To represent the process flowsheets in the same way as molecules, a unique but simple notation system has been developed. The methodology has been converted into a prototype software, which has been tested with several case studies covering...... a wide range of problems. In this paper, only the computer aided flowsheet design related features are presented....

  17. CAD/CAM ceramic restorations in the operatory and laboratory.

    Science.gov (United States)

    Fasbinder, Dennis J

    2003-08-01

    Computer assisted design/computer assisted machining (CAD/CAM) technology has received considerable clinical and research interest from modern dental practices as a means of delivering all-ceramic restorations. The CEREC, System offers CAD/CAM dental technology designed for clinical use by dentists, as well as a separate system designed for dental laboratory technicians. The CEREC 3 system is indicated for dental operatory applications, and the CEREC inLab, system is indicated for dental laboratory applications. Although both systems rely on similar CAD/CAM technology, several significant differences exist in the processing techniques involved, restorative materials used, and types of restoration provided. PMID:14692164

  18. Computer-aided Framework for Design of Pure, Mixed and Blended Products

    DEFF Research Database (Denmark)

    Cignitti, Stefano; Zhang, Lei; Gani, Rafiqul

    2015-01-01

    Design of novel chemical products with process and application considerations is an emerging topic in thefield of chemical and biochemical engineering. Methods, such as Computer Aided Molecular Design(CAMD) [1] and Computer-aided Mixture and Blend Design (CAMbD) [2], provide the possibility...... metrics that must be included in today’s product designs, consequently makes the problem harder to mathematically formulate and to solve.In this work, a framework for computer-aided design of pure, mixed and blended chemical products hasbeen developed. The framework is a systematic approach to formulate...... and solve CAMbD problems throughfour sequential steps. In the first step, the needs, target properties and product type are defined. In the second step, the CAMbD is formulated together with objectives and process/application model. In the third step,the formulation is then converted into a mixed integer...

  19. CFD Aided Design and Optimization of Francis Turbine Runners

    Science.gov (United States)

    Ayancik, Fatma; Demirel, Gizem; Celebioglu, Kutay; Acar, Erdem; Aradag, Selin; ETU Hydro Research Center Team

    2014-11-01

    Francis turbines are commonly used for hydroelectric power plants with their wide range of flow rate and head values. They are composed of five main components and they generate energy with the help of the runner connected to the generator. Therefore, runner is the most important part of a Francis turbine. All components of turbines are linked and they are designed to maximize the turbine efficiency. The dimensions of the runner vary depending on the design discharge, head and the speed of the rotor of the generators. In this study, a design methodology is developed to design turbine runners with the help of computational fluid dynamics and is applied to the runner design of three different hydroelectric power plant turbines. Multi objective design optimization is also performed and the response surfaces are investigated to obtain maximum turbine efficiency and cavitation free design. This study is financially supported by Turkish Ministry of Development.

  20. Uchebno-issledovatel'skaya SAPR funktsional'nykh uzlov RES [Teaching and research CAD functional units of radioelectronic tools

    Directory of Open Access Journals (Sweden)

    A. G. Makarov

    1993-05-01

    Full Text Available Proposed training and research CAD designed for use in laboratory practice on the course "Design Automation of Radioelectronic tools". The questions of the structure of CAD, information, software and methodological support.

  1. CAD support section: tasks and projects

    CERN Document Server

    Friman, Per Olof; CERN. Geneva. TS Department

    2004-01-01

    The CAE section is well known for its daily support of CAD usage at CERN but, in fact, a large part of the section’s activity is dedicated to anticipating future needs and dealing with operating systems issues and evolution of CAD software. The section supports more than 200 professional CAD users located all around the site, and it helps many other users at CERN and outside with CAD data exchange. The section is in charge of developing tools to fulfil the specific needs of the design offices and adapting these tools to the changing hardware and software environment. As an example, the section, in collaboration with the MME design office and the survey group, has developed the DMU application, which is used extensively for the LHC integration studies. In the coming years, the big challenge for the section as well as for the design offices will be the introduction of Catia. This project, started last year, is going on to adapt Catia and its data manager SmarTeam to the tools and practices in use today. Ca...

  2. Modeling and Simulation of Wave Gait of a Hexapod Walking Robot: A CAD/CAE Approach

    Directory of Open Access Journals (Sweden)

    Abhijit Mahapatra

    2013-03-01

    Full Text Available In the present paper, an attempt has been made to carry out dynamic analysis of a hexapod robot using the concept of multibody dynamics. A CAD (Computer Aided Design model of a realistic hexapod robot has been made for dynamic simulation of its locomotion using ADAMS (Automatic Dynamic Analysis of Mechanical Systems multibody dynamics solver. The kinematic model of each leg of three degrees of freedom has been designed using CATIA (Computer Aided Three Dimensional Interactive Application and SimDesigner package in order to develop an overall kinematic model of the robot, when it follows a straight path. Joint Torque variation as well as the variation of the aggregate center of mass of the robot was analyzed for the wave tetrapod gait. The simulation results provide the basis for developing the control algorithm as well as an intelligent decision making for the robot while in motion.

  3. AutoCAD / AutoCAD LT 2014 fundamentals metric

    CERN Document Server

    ASCENT center for technical knowledge

    2014-01-01

    The objective of AutoCAD/AutoCAD LT 2014 Fundamentals is to enable students to create a basic 2D drawing in the AutoCAD software. Even at this fundamental level, the AutoCAD software is one of the most sophisticated computer applications that you are likely to encounter. Therefore learning to use it can be challenging. To make the process easier and provide flexibility for instructors and students, the training guide is divided into two parts that can be taken independently.

  4. A new CAD approach for improving efficacy of cancer screening

    Science.gov (United States)

    Zheng, Bin; Qian, Wei; Li, Lihua; Pu, Jiantao; Kang, Yan; Lure, Fleming; Tan, Maxine; Qiu, Yuchen

    2015-03-01

    Since performance and clinical utility of current computer-aided detection (CAD) schemes of detecting and classifying soft tissue lesions (e.g., breast masses and lung nodules) is not satisfactory, many researchers in CAD field call for new CAD research ideas and approaches. The purpose of presenting this opinion paper is to share our vision and stimulate more discussions of how to overcome or compensate the limitation of current lesion-detection based CAD schemes in the CAD research community. Since based on our observation that analyzing global image information plays an important role in radiologists' decision making, we hypothesized that using the targeted quantitative image features computed from global images could also provide highly discriminatory power, which are supplementary to the lesion-based information. To test our hypothesis, we recently performed a number of independent studies. Based on our published preliminary study results, we demonstrated that global mammographic image features and background parenchymal enhancement of breast MR images carried useful information to (1) predict near-term breast cancer risk based on negative screening mammograms, (2) distinguish between true- and false-positive recalls in mammography screening examinations, and (3) classify between malignant and benign breast MR examinations. The global case-based CAD scheme only warns a risk level of the cases without cueing a large number of false-positive lesions. It can also be applied to guide lesion-based CAD cueing to reduce false-positives but enhance clinically relevant true-positive cueing. However, before such a new CAD approach is clinically acceptable, more work is needed to optimize not only the scheme performance but also how to integrate with lesion-based CAD schemes in the clinical practice.

  5. Design of casting blanks in CAPP system for parts of piston-cylinder assembly of internal combustion engines

    Directory of Open Access Journals (Sweden)

    V. Todić

    2012-01-01

    Full Text Available Development of information technology industry provided great possibilities in the area of integration of diff erent CAx systems, such as CAD, CAM, CAE and others. In order to successfully link systems of automated-design (or Computer Aided Design - CAD with automated manufacturing systems (or Computer Aided Manufacturing – CAM, automation of manufacturing process planning is needed, i.e. CAPP (Computer-Aided Process Planning systems can bridge a gap between design and manufacturing. In this paper is shown design of casting blanks in CAPP system for parts of piston-cylinder assembly of internal combustion engines in a manufacturing system.

  6. Computer-aided Framework for Design of Pure, Mixed and Blended Products

    DEFF Research Database (Denmark)

    Cignitti, Stefano; Zhang, Lei; Gani, Rafiqul

    2015-01-01

    This paper presents a framework for computer-aided design of pure, mixed and blended chemical based products. The framework is a systematic approach to convert a Computer-aided Molecular, Mixture and Blend Design (CAMbD) formulation, based on needs and target properties, into a mixed integer non-......-linear program (MINLP). TheMINLP is sequentially solved through a decomposed optimization approach to solve the possibly large MINLP in a smaller set of sub-problems. The framework application is highlighted through a solvent design case study....

  7. Aiding Design of Wave Energy Converters via Computational Simulations

    Science.gov (United States)

    Jebeli Aqdam, Hejar; Ahmadi, Babak; Raessi, Mehdi; Tootkaboni, Mazdak

    2015-11-01

    With the increasing interest in renewable energy sources, wave energy converters will continue to gain attention as a viable alternative to current electricity production methods. It is therefore crucial to develop computational tools for the design and analysis of wave energy converters. A successful design requires balance between the design performance and cost. Here an analytical solution is used for the approximate analysis of interactions between a flap-type wave energy converter (WEC) and waves. The method is verified using other flow solvers and experimental test cases. Then the model is used in conjunction with a powerful heuristic optimization engine, Charged System Search (CSS) to explore the WEC design space. CSS is inspired by charged particles behavior. It searches the design space by considering candidate answers as charged particles and moving them based on the Coulomb's laws of electrostatics and Newton's laws of motion to find the global optimum. Finally the impacts of changes in different design parameters on the power takeout of the superior WEC designs are investigated. National Science Foundation, CBET-1236462.

  8. Computer aided hydraulic design of axial flow pump impeller

    International Nuclear Information System (INIS)

    Pumps are the heart of any power plant and hence their design requires great attention. Computers with their potential for rapid computation can be successfully employed in the design and manufacture of these machines. The paper discusses a program developed for the hydraulic design of axial flow pump impeller. The program, written in FORTRAN 77, is interactive and performs the functions of design calculation, drafting and generation of numerical data for blade manufacture. The drafting function, which makes use of the software ACAD, is carried out automatically by means of suitable interface programs. In addition data for blade manufacture is also generated in either the x-y-z or r-θ-z system. (author). 4 refs., 3 figs

  9. Systems Design Perspective of Healthcare Provision in Humanitarian Aid

    Directory of Open Access Journals (Sweden)

    Ana Laura Santos

    2014-12-01

    Full Text Available This study focuses on the role of Systems Design in addressing the challenges of healthcare provision by international emergency relief organizations in developing countries. More specifically the challenges related to the safety and performance of medical equipment that is transferred in the aftermath of a humanitarian crisis. The aim of this paper is to describe the transfer of medical equipment and its associated challenges from a systems perspective and to reflect on the value of Systems Design as an approach to humanitarian innovation, addressing the identified systemic challenges. The concepts of Human Factors and Ergonomics, and Product-Service Systems will be presented as valuable contributions to support designers in handling a larger degree of complexity throughout the design process and to support them to make informed choices regarding this particular context.

  10. Discuss the Development of Computer-Aided Industrial Design Technology

    Directory of Open Access Journals (Sweden)

    Jun Yao

    2013-01-01

    Full Text Available The direction of the development of the industrial design gradually approaches mechanical-electrical integration and informational and electronic products. With an increasing improvement of its technical content, and better social economic conditions, peoples consumption concept are getting more and more different. Consumer concerns not just the functionality and quality of the product, more and more people are starting to focus on the appearance of the product, degree of innovation, environmental protection, and so on, which brings a higher degree of difficulty to the industrial technology. It is because the increasing demands of people and the industrial design, many scholars are increasingly concerned about the industrial design in recent years. With the continuous development of computer technology, a wide variety of hardware and software are developed, and a variety of ever-changing technologies are attracting the industrial design talents as well.

  11. Evolutionary Algorithm Aided Interleaver Design for Serially Concatenated Codes

    OpenAIRE

    Maunder, R.G.; Hanzo, L

    2011-01-01

    In this paper, we propose an algorithm for designing the interleavers of Serially Concatenated Codes (SCCs), in order to increase the Minimum Hamming Distance (MHD) between the legitimate permutations of the encoded bit sequence and hence to improve the corresponding error floor. Unlike previous so-called Code Matched Interleaver (CMI) designs, our approach is capable of creating interleavers for serial concatenations of both irregular and non-linear codes, as well as achieving MHDs that are ...

  12. 计算机辅助设计与制作技术在下颌骨缺损个体化钛赝复体修复中的应用%Application of computer aided design-computer aided manufacture technique in mandible defect reconstruction with individual titanium prosthesis

    Institute of Scientific and Technical Information of China (English)

    徐昕; 严君烈; 平飞云; 陈军; 严奉国; 单一旦

    2011-01-01

    Objective To investigate the application of computer aided design-computer aided manufacture(CAD-CAM)technique in the reconstruction of mandible defect with individual titanium prosthesis. Methods Six patients with large mandibular ramus and angle tumor were spiral CT scanned preoperatively, and the CAD-CAM was used to design and make individual titanium prosthesis for reconstructing the mandibular defects after resection of the tumor. The prosthesis were assembled during operation. Postoperative follow-up period was 9-38 months.Results The design and manufacture of titanium prosthesis by use of CAD-CAM technique was convenient and the prosthesis fitted the defects very well.The outline of the face,the occlusion and function were restored. After 9-38 months of follow-up, the mandibular symmetry was good.Conclusions The application of CAD-CAM provided accurate simulation and fast manufacturing process for the titanium prosthesis in the repair of mandibular defect.%目的 探讨计算机辅助设计与制作(CAD-CAM)在下颌骨缺损赝复体设计、制作及临床中的应用.方法 下颌骨升支及下颌角肿瘤患者6例术前行螺旋CT扫描,利用CAD-CAM在三维虚拟模型上进行模型外科设计,三维虚拟模型上调整下颌骨赝复体的位置、大小和形状.在达到最佳设计要求后,通过与电脑相连的精雕机直接将医用钛合金切削成钛赝复体,设计并制成与患者下颌骨缺损区正常外形相同的个体化钛赝复体,术中根据术前设计切除下颌骨病变区骨组织,植入个体化钛赝复体.结果 6例术中显示下颌骨钛赝复体与下颌骨缺损区吻合程度一致.术后随访9~38个月.X线片显示钛赝复体与下颌骨贴合良好,重建的下颌骨形态对称良好.术后患者面部外形恢复正常,咬合关系及张口度恢复良好.结论 CAD-CAM为下颌骨病变的术前手术设计、钛修复赝复体的个体化设计制作提供了精确的模拟及快速制作过程,

  13. Engineering drawing from first principles using AutoCAD

    CERN Document Server

    Maguire, Dennis E

    1998-01-01

    Engineering Drawing From First Principles is a guide to good draughting for students of engineering who need to learn how to produce technically accurate and detailed designs to British and International Standards. Written by Dennis Maguire, an experienced author and City and Guilds chief examiner, this text is designed for use on Further Education and University courses where a basic understanding of draughtsmanship and CAD is necessary. Although not written as an AutoCAD tutor, the book will be a useful introduction to good CAD practice.Part of the Revision and Self-Assessmen

  14. Beginning AutoCAD 2005

    CERN Document Server

    McFarlane, Bob

    2005-01-01

    Beginning AutoCAD 2005 is a course based on learning and practising the essentials of 2D drawing using AutoCAD. Bob McFarlane's hands-on approach is uniquely suited to independent learning and use on courses. The focus on 2D drawing in one book, ensures the reader gets a thorough grounding in the subject, with a greater depth of coverage than tends to be available from general introductions to AutoCAD. As a result, this book provides a true, step-by-step, detailed exploration of the AutoCAD functions required at each stage of producing a 2D drawing - an approach often

  15. Tools for building Breast Cancer CAD methods

    International Nuclear Information System (INIS)

    This paper describes the main results of the collaboration currently ongoing between CETA-CIEMAT and the Faculty of Engineering at the University of Porto. It introduces the Mammography image Workstation for Analysis and Diagnosis (MIWAD) and the data analysis processes through which Grid infrastructures are used to develop Breast Cancer Computer-Aided Diagnosis (CAD) methods.MIWAD is a novel integrated software framework that integrates a specialized graphical user interface combining digital image processing, pattern recognition and artificial intelligence techniques. This paper describes its successful application in a pilot experience, on the first Portuguese Breast Cancer Digital Repository. (Author)

  16. Human Factor Issues Affecting CAD Implementations

    Directory of Open Access Journals (Sweden)

    C. Short

    2000-01-01

    Full Text Available Industrial companies have been implementing Computer Aided Engineering tools for many years with varying degrees of success. In the early implementations considerable emphasis was placed upon the organisational structure necessary to receive and optimise system output. However, it is becoming increasingly clear that any successful CAE implementation has to satisfy three inter-related factors of technology, organisation and human issues. This paper presents the results of an investigation into human factors affecting successful CAD implementation, undertaken through selected case studies and a more general survey of UK industry.

  17. Design of Automatic Programming System of Numerical Control Based on AutoCAD%基于AutoCAD数控自动编程系统的设计*

    Institute of Scientific and Technical Information of China (English)

    高杰; 袁吉; 邵振威

    2013-01-01

    AutoCAD作为目前主流的绘图软件广泛应用于很多领域,其强大的功能为数控自动编程提供了基础。该系统的建立主要基于VBA与AutoCAD系统中ActiveX自动化对象模型两者之间的结合,从而对AutoCAD进行内部二次开发,即以ActiveX自动化对象模型为基础建立了前置处理模块;利用Access建立加工参数数据库系统和数据库检索系统,并建立了数控自动编程系统,使AutoCAD具备一定的CAM功能,达到改善现有数控车床自动编程环境的目的。%AutoCAD, as current mainstream graphics software, is widely used in many fields. Its powerful features provide basis for automatic programming of numerical control. The establishment of this system is mainly based on integration of be-tween ActiveX automation object model and VBA which belong to AutoCAD system. AutoCAD is made internal secondary development: establishing pre-processing module based on ActiveX automation object model; building processing parameter database systems and database retrieval system by using Access, and establishing NC automatic programming system, which make AutoCAD have some CAM functions and achieve objects of improving automatic programming environment of existing numerically controlled lathe.

  18. AutoCAD 3D pour l'architecture et le design : conception d'une maison et de son mobilier

    CERN Document Server

    Riccio, Michel

    2010-01-01

    Module 3D d'AutoCAD, logiciel leader de dessin assisté par ordinateur, AutoCAD 3D est l'outil indispensable des architectes qui souhaitent présenter leurs travaux en trois dimensions. Voici donc un livre très pédagogique qui leur fera découvrir ses principales fonctionnalités (versions 2006 à 2010) à travers un projet de conception de maison contemporaine. Riche de 700 plans, schémas et dessins, il explique quels outils employer pour modéliser les façades d'une villa, sa piscine et sa terrasse, ainsi que son architecture intérieure et son mobilier. Dès les premières pages, le lecteur se retrouve ainsi plongé dans la pratique, voyant se construire au fil des 17 ateliers un édifice tridimensionnel complexe, qu'il aura la satisfaction d'avoir créé lui-même. A qui s'adresse ce livre ? Aux bureaux d'architectes qui souhaitent présenter leurs projets en 3D ; À tous les étudiants en écoles d'architecture ; Aux utilisateurs 2D d'AutoCAD qui désirent connaître les fonctions 3D de ce logiciel.

  19. Proposal of a CAD/PDM-ERP Integration Procedure

    Institute of Scientific and Technical Information of China (English)

    Marcos; Leandro; Simonetti; Luís; Gonzaga; Trabasso

    2002-01-01

    The current globalization process exposed the compa ni es to new challenges. One of those strongly related with the competitive strateg y of the companies is to develop better quality products faster and cheaper than the competitors. The companies have been investing great amount of resources in computer applica tions that aid the new products process development, such as: Computer Aided Des ign (CAD), Product Data Management (PDM) and Enterprise Resource Planning-(ERP) , only to name a few. A quick inv...

  20. Deterministic mathematical morphology for CAD/CAM

    OpenAIRE

    Sarabia Pérez, Rubén; Jimeno Morenilla, Antonio; Molina Carmona, Rafael

    2014-01-01

    Purpose – The purpose of this paper is to present a new geometric model based on the mathematical morphology paradigm, specialized to provide determinism to the classic morphological operations. The determinism is needed to model dynamic processes that require an order of application, as is the case for designing and manufacturing objects in CAD/CAM environments. Design/methodology/approach – The basic trajectory-based operation is the basis of the proposed morphological specialization. This ...