WorldWideScience

Sample records for brownouts

  1. Photogrammetric Measurements of an EH-60L Brownout Cloud

    Science.gov (United States)

    Wong, Oliver D.; Tanner, Philip E.

    2010-01-01

    There is a critical lack of quantitative data regarding the mechanism of brownout cloud formation. Recognizing this, tests were conducted during the Air Force Research Lab 3D-LZ Brownout Test at the US Army Yuma Proving Ground. Photogrammetry was utilized during two rounds of flight tests with an instrumented EH-60L Black Hawk to determine if this technique could quantitatively measure the formation and evolution of a brownout cloud. Specific areas of interest include the location, size, and average convective velocity of the cloud, along with the characteristics of any defined structures within it. Following the first flight test, photogrammetric data were validated through comparison with onboard vehicle data. Lessons learned from this test were applied to the development of an improved photogrammetry system. A second flight test, utilizing the improved system, demonstrated that obtaining quantitative measurements of the brownout cloud are possible. Results from these measurements are presented in the paper. Flow visualization with chalk dust seeding was also tested. It was observed that pickup forces of the brownout cloud appear to be very low. Overall, these tests demonstrate the viability of photogrammetry as a means for quantifying brownout cloud formation and evolution.

  2. The Use of Commercial Remote Sensing Predicting Helicopter Brownout Conditions

    Science.gov (United States)

    2007-09-01

    result in impacting obstacles and other aircraft, or landing with too much momentum and damaging the landing gear or rolling the helicopter over on...Sensing in Predicting Helicopter Brownout Conditions. September 2006 (Top Secret). Tan, Kim H., First Edition, Enviromental Soil Science Marcel

  3. Helicopter collision avoidance and brown-out recovery with HELLAS

    Science.gov (United States)

    Seidel, Christian; Schwartz, Ingo; Kielhorn, Peter

    2008-10-01

    EADS Germany is the world market leader in commercial and military Helicopter Laser Radar (HELLAS) Obstacle Warning Systems. The HELLAS-Warning System has been introduced into the market in 2000, is in service at German Federal Police and Royal Thai Air Force. HELLAS was also successfully evaluated by the Foreign Comparative Test Program (FCT) of the U.S. Army and other governmental agencies. Currently the successor system for military applications, HELLAS-Awareness, is in qualification phase. It will have extended sensor performance, enhanced real-time data processing capabilities and advanced human machine interface (HMI) features. Flight tests on NH90 helicopter have been successfully performed. Helicopter series integration is scheduled to begin from 2009. We will give an outline of the new sensor unit concerning detection technology and helicopter integration aspects. The system provides a widespread field of view with additional dynamic line of sight steering and a large detection range in combination with a high frame rate. We will show the HMI representations. This HELLAS system is the basis for a 3 dimensional see-and-remember-system for brown-out recovery. When landing in sandy or dusty areas the downwash of the helicopter rotor causes clouds of visually-restrictive material that can completely obstruct the pilot's outside reference, resulting in a complete loss of situational awareness and spatial orientation of the pilot which can end up in total loss of aircraft control and dangerous accidents. The brown-out recovery system presented here creates an augmented enhanced synthetic vision of the landing area with the surrounding which is based on HELLAS range image data as well as altimeter and inertial reference information.

  4. A Computational Tool for Evaluating THz Imaging Performance in Brownout Conditions at Land Sites Throughout the World

    Science.gov (United States)

    2009-03-01

    phone interview with U.S. Army Warrant Officer and Apache helicopter pilot Shannon T. Wooten , it was stated that all pilots must attend brownout...brownout, it would be ideal to at least see beyond the rotor (~ 15m) to ensure no rotor strike takes place. Warrant Officer Wooten stated that as a

  5. A technique to measure optical properties of brownout clouds for modeling terahertz propagation.

    Science.gov (United States)

    Fiorino, Steven T; Deibel, Jason A; Grice, Phillip M; Novak, Markus H; Spinoza, Julian; Owens, Lindsay; Ganti, Satya

    2012-06-01

    Brownout, the loss of visibility caused by dust resultant of helicopter downwash, is a factor in the large majority of military helicopter accidents. As terahertz radiation readily propagates through the associated dust aerosols and is attenuated by atmospheric water vapor within short distances, it can provide low-profile imaging that improves effective pilot visibility. In order to model this application of terahertz imaging, it is necessary to determine the optical properties of obscurants at these frequencies. We present here a method of empirical calculation and experimental measurement of the complex refractive index of the obscuring aerosols. Results derived from terahertz time-domain spectral measurements are incorporated into the AFIT CDE Laser Environmental Effects Definition and Reference (LEEDR) software.

  6. Rotorcraft Brownout: Advanced Understanding, Control and Mitigation

    Science.gov (United States)

    2008-12-31

    sediment bed. Evaluation of the spatial structure of an impinging flow of known source intensity is achieved with a 3D hot - wire anemometer. Following...iv) Purchase of equipment to upgrade the wind-tunnel anemometry system, v) Purchase of materials (particles) for use in wind tunnel

  7. Rotorcraft Brownout Advanced Understanding, Control, and Mitigation

    Science.gov (United States)

    2014-10-31

    the optical obscuration and scattering effects of the dust using graphical libraries like Open Graphics Library ( OpenGL ). 109 GPU memory Multipurpose... OpenGL based open-source soft- ware visualization toolkit OpenSceneGraph (OSG). This toolkit is written in standard C++ and OpenGL , and can run on most

  8. Physics Based Modeling of Helicopter Brownout for Piloted Simulation Applications

    Science.gov (United States)

    2008-12-01

    Software who designed the rendering of the physical cloud in Open Scene Graph. REFERENCES Bird, S.L., Perry, S.G., Ray, S.L. and Teske , M.E. (2002...Graphics, Visualization and Computer Vision, February 2002, Keller, J.D., Whitehouse, G.R., Wachspress, D.A., Teske , M.E., and Quackenbush, T.R. (2006). "A

  9. Brownout for 20%Down? Settle Year-End Accounts Now

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    Five years ago,Chinese government vowed to bring its energy consumption down by 20%against unit gross domestic product(GDP) during 2006 - 2010,an ambitious but realistic target laid down in a clear-cut term in its 11th Five-Year Plan for Economic and Social Development.It’s time to finish the goal, but how?

  10. Rotary-Wing Brownout Mitigation: Technologies and Training (Remedes contre le phenomene de brownout sur les appareils a voilure tournante: Technologies et entrainement)

    Science.gov (United States)

    2012-01-01

    respective services. Case 1: France – Three Pumas helicopters on a patrol flight under NVG . First aircraft landed provoking whirling dust. The second...command decided to go around. After flight inspection showed a structural damage of the stabilizer. Case 2: France – A Puma helicopter under NVG on...pile had been invisible on NVGs during high and low recce. During take-off in white out, the helicopter drifted forward and hit the top of a tree

  11. Investigating the Impacts of Particle Size and Wind Speed on Brownout

    Science.gov (United States)

    2015-03-26

    Hier- archical Aeromechanics Rotorcraft Model (CHARM) coupled rotary-wing free wake, fast panel fuselage, ground surface model; its Multiple Aircraft...traditional main and tail rotor system. Particle clusters are pushed away from the nose of the CH-47, creating more of a bow or semi-circle. Figure 6 shows the...Holton, J.R., 2004: An Introduction to Dynamic Meteorology, Fourth Edition, Elsevier Academic Press. 48 IPCC (Intergovernmental Panel on Climate

  12. An Examination of a Pumping Rotor Blade Design for Brownout Mitigation

    Science.gov (United States)

    2015-05-18

    negative thrust effect was mathe - 70 matically removed, all pumping blade designs were found to exhibit similar perfor- mance characteristics. 2. When the...Pneumodynamic Characteristics of a Circulation Control Rotor Model,” 2nd Decennial Specialist ’ Meeting on Ro- torcraft Dynamics, NASA Ames Research

  13. Development of a nonlinear estimator-based model of pilot performance during brownout conditions

    Science.gov (United States)

    Schultz, Karl Ulrich

    During conditions of visual occlusion, pilots are forced to rapidly adapt their scan to accommodate the new observable states via instruments rather than the visual environment. During this transition, the provision of aircraft state information via other than visual modalities improves pilot performance presumably through the increase in situational awareness provided immediately following the visual occlusion event. The Tactile Situational Awareness System (TSAS) was developed to provide continuous position information to the pilot via tactile rather than visual means. However, as a low-resolution display, significant preprocessing of information is required to maximize utility of this new technology. Development of a nonlinear time varying estimator based multivariable model enables more accurate reproduction of pilot performance than previous models and provides explanations of many observed phenomena. The use of LQR feedback and an optimal estimator is heuristically consistent with reported strategies and was able to match pilot incorporation of multi-modal displays. Development of a nonlinear stochastic map of pilot "move-and-hold" control performance was able to accurately match increased pilot control noise at higher frequencies, a phenomenon formerly attributed to closed loop neuromuscular effects. The continued improvement of this model could eventually result in the early stage mathematical prediction of the effectiveness of emerging cockpit technology and preprocessing algorithms, prior to costly hardware development and flight evaluation.

  14. FlyTact : A tactile display improves a helicopter pilot's landing performance in degraded visual environments

    NARCIS (Netherlands)

    Jansen, C.; Wennemers, A.S.; Vos, W.K.; Groen, E.L.

    2008-01-01

    Helicopter landings are more challenging in 'brownout' conditions, in which sand and dust is stirred up by the rotary wing aircraft, obscuring visibility. Safe brownout landings require new sensor and display technologies to provide the pilot with information on helicopter motion. In this respect ta

  15. Measurements to Understand the Flow Mechanisms Contributing to Tandem Rotor Outwash

    Science.gov (United States)

    2015-05-23

    complemented both DWOW and brownout. Developing a scientific approach towards alleviating the adverse effects of DWOW begins with characterizing the...Green, R. B., “ Measurements of a Rotor Flow in Ground Effect and Visualisation of the Brown-out Phenomenon,” Proceedings of the Amer- ican Helicopter

  16. Optimal Dispatch of an Industrial Microgrid with a Mixed Portfolio of Distributed Energy Resources

    DEFF Research Database (Denmark)

    You, Shi; Zong, Yi; Bindner, Henrik W.

    2014-01-01

    Local brownouts are a nuisance and have driven consumers to take greater responsibility for their electricity supply – particularly industries and communities with a critical need for reliable and safe power. By deploying a Microgrid on their own site, the consumers could benefit from having...

  17. 2012 U.S. Marine Corps S&T Strategic Plan

    Science.gov (United States)

    2012-01-17

    coordination. -- AVN STO-3: Sand and dust- penetrating radar , providing precision (landing quality) navigation video in brownout and dust-out...Corps. As you read this plan, you will find that it addresses capability needs for each of the elements of our Marine Air- Ground Task Force as well...Performance • Landmine and Improvised Explosive Device (IED) countermeasures (to include both detection, induced pre-detonation, and survivability

  18. A Systems Engineering Process for Selecting Technologies to Mitigate the Risk of Operating Rotorcraft in Degraded Visual Environments

    Science.gov (United States)

    2013-09-30

    Rotorcraft in Degraded Visual Environments 6. AUTHOR(S) T.A. Dellert, C.C. Bivens, S. Balestrini-Robinson, PhD., J.M. Zentner, Ph.D. and IVl.D. Hopkins 3...their ability to mitigate the gaps. 15. SUBJECT TERMS Degraded Visual Environment; Design of Experiments, Functional Needs Analysis, Usable /cue...Environment, Systems Engineering, Pilot Vehicle Interface, Rotorcraft operations. Brownout, Reduced Visibility, Handling Qualities, Flight Controls

  19. A Mapping from the Human Factors Analysis and Classification System (DOD-HFACS) to the Domains of Human Systems Integration (HSI)

    Science.gov (United States)

    2009-11-01

    X Habitability X X X Environment X X Sources: (ACM, 2006; AIRPRINT, 2005; Booher, 2003; DAU, 2006; HFIDTC, 2006; INCOSE, 2007; ISO/ IEC ...PE109 Lightning of Other Aircraft/Vehicle x PE110 Noise Interference x x x x PE111 Brownout/Whiteout x x PE201 Seating and...INCOSE. (2007). In Haskins C. (Ed.), Systems engineering handbook (Ver. 3.1 ed.) International Council on Systems Engineering. ISO/ IEC . (2007

  20. Target identification and navigation performance modeling of a passive millimeter wave imager.

    Science.gov (United States)

    Jacobs, Eddie L; Furxhi, Orges

    2010-07-01

    Human task performance using a passive interferometric millimeter wave imaging sensor is modeled using a task performance modeling approach developed by the U.S. Army Night Vision and Electronic Sensors Directorate. The techniques used are illustrated for an imaging system composed of an interferometric antenna array, optical upconversion, and image formation using a shortwave infrared focal plane array. Two tasks, target identification and pilotage, are modeled. The effects of sparse antenna arrays on task performance are considered. Applications of this model include system trade studies for concealed weapon identification, navigation in fog, and brownout conditions.

  1. Two-Dimensional Rotorcraft Downwash Flow Field Measurements by Lidar-Based Wind Scanners with Agile Beam Steering

    DEFF Research Database (Denmark)

    Sjöholm, Mikael; Angelou, Nikolas; Hansen, Per;

    2014-01-01

    A major risk to helicopters is the unexpected encounter of degraded visual environments in close-to-ground operations, where a loss of visibility often is caused by clouds of dust (brownout) or snow (whiteout) stirred up by intense downwash. The understanding of the phenomenon is limited, and the......A major risk to helicopters is the unexpected encounter of degraded visual environments in close-to-ground operations, where a loss of visibility often is caused by clouds of dust (brownout) or snow (whiteout) stirred up by intense downwash. The understanding of the phenomenon is limited......, and there is a need for instruments that can measure flow fields on scales larger than a few meters with good resolution. This paper reports on the use of synchronized continuous-wave Doppler lidars for rotorcraft downwash flow field studies. Built from a modified ZephIR wind lidar and a double-prism arrangement...... position; all points in space within a cone with a full opening angle of 1208 can be reached from about 8mout to some hundred meters depending on the range resolution required. The first two-dimensional mean wind fields measured in a horizontal plane and in a vertical plane below a hovering search...

  2. Toward autonomous rotorcraft flight in degraded visual environments: experiments and lessons learned

    Science.gov (United States)

    Stambler, Adam; Spiker, Spencer; Bergerman, Marcel; Singh, Sanjiv

    2016-05-01

    Unmanned cargo delivery to combat outposts will inevitably involve operations in degraded visual environments (DVE). When DVE occurs, the aircraft autonomy system needs to be able to function regardless of the obscurant level. In 2014, Near Earth Autonomy established a baseline perception system for autonomous rotorcraft operating in clear air conditions, when its m3 sensor suite and perception software enabled autonomous, no-hover landings onto unprepared sites populated with obstacles. The m3's long-range lidar scanned the helicopter's path and the perception software detected obstacles and found safe locations for the helicopter to land. This paper presents the results of initial tests with the Near Earth perception system in a variety of DVE conditions and analyzes them from the perspective of mission performance and risk. Tests were conducted with the m3's lidar and a lightweight synthetic aperture radar in rain, smoke, snow, and controlled brownout experiments. These experiments showed the capability to penetrate through mild DVE but the perceptual capabilities became degraded with the densest brownouts. The results highlight the need for not only improved ability to see through DVE, but also for improved algorithms to monitor and report DVE conditions.

  3. China Cools with Tighter RAC Standards

    Energy Technology Data Exchange (ETDEWEB)

    Lin, Jiang; Rosenquist, Gregory

    2006-06-01

    After boiling summer brought brown-out to most part of the country in 2004, China announced a new set of minimum energy efficiency standards for room air conditioners in September 2004, with the first tier going into effect on March 1, 2005 and the reach standard taking effect on January 1, 2009. This represents a milestone in China's standard setting process since the reach standard levels are significantly more stringent than previous standards for other appliances. This paper first analyzes cost-effectiveness of China's new standards for room air conditioners, and then attempts to evaluate the impact of the new standards on energy savings, electric generation capacity, and CO2 emissions reductions.

  4. Ramos` private-power policies pay off

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1995-11-01

    This article reports that political stability, government incentives attract foreign capital for new generating plants and T and D facilities. Teams of multinational lenders, developers, equipment vendors, engineering contractors erect critical plants in record time. As recently as the summer of 1993, the Republic of the Philippines was teetering on the brink of bankruptcy--mainly because of electricity shortages. Brownouts averaging seven hours a day were common nationwide, and Manila`s business districts were frequently blacked out for most of the day. With the nation of 67-million facing economic losses estimated at several billion dollars a year, President Fidel V. Ramos took swift, decisive action. Ramos, elected the previous year, accelerated power-sector reforms initiated by his predecessor, Corazon C. Aquino, that sought to augment the aging, unreliable generating capacity of the state-owned electric utility with private power development.

  5. Two-phase PIV measurements of particle suspension in a forced impinging jet

    Science.gov (United States)

    Mulinti, Rahul; Kiger, Ken

    2010-11-01

    The condition of rotorcraft brownout is characterized by intense dust suspension that is uplifted during landing and takeoff operations in regions covered with loose sediment. To predict particle suspension and sedimentation within coupled particle-laden flows, detailed characterization of the micro-scale mechanics is needed within a prototypical flow that captures the essence of the rotorcraft/ground wake interactions. Two-phase PIV has been used to study the interaction of a sediment bed made of glass spheres with characteristic flow structures reminiscent from flow within a rotor wake. In order to make reliable simultaneous two-phase PIV measurements, a phase discrimination algorithm from a single two-phase image has been implemented. The validity of the separation is checked by processing images that consisted only of the very small tracer particles, or only the dispersed phase particles, and examining how much "cross-talk" was present between the phases. The mobilization and wall-normal flux of particulates by the vortex-wall interaction will be reported for several different operational conditions, and correlated to the local vortex conditions.

  6. Amplifier based broadband pixel for sub-millimeter wave imaging

    Science.gov (United States)

    Sarkozy, Stephen; Drewes, Jonathan; Leong, Kevin M. K. H.; Lai, Richard; Mei, X. B. (Gerry); Yoshida, Wayne; Lange, Michael D.; Lee, Jane; Deal, William R.

    2012-09-01

    Broadband sub-millimeter wave technology has received significant attention for potential applications in security, medical, and military imaging. Despite theoretical advantages of reduced size, weight, and power compared to current millimeter wave systems, sub-millimeter wave systems have been hampered by a fundamental lack of amplification with sufficient gain and noise figure properties. We report a broadband pixel operating from 300 to 340 GHz, biased off a single 2 V power supply. Over this frequency range, the amplifiers provide > 40 dB gain and mobility transistor technology, based on a sub-50 nm gate and indium arsenide composite channel with a projected maximum oscillation frequency fmax>1.0 THz. The first sub-millimeter wave-based images using active amplification are demonstrated as part of the Joint Improvised Explosive Device Defeat Organization Longe Range Personnel Imager Program. This development and demonstration may bring to life future sub-millimeter-wave and THz applications such as solutions to brownout problems, ultra-high bandwidth satellite communication cross-links, and future planetary exploration missions.

  7. Performance evaluation of active sub-Terahertz systems in Degraded Visual Environments (DVE)

    Science.gov (United States)

    Ceolato, Romain; Tanguy, Bernard; Martin, Christian; Huet, Thierry; Chervet, Patrick; Durand, Gerard; Riviere, Nicolas; Hespel, Laurent; Diakonova, Nina; But, Dmitry; Knap, Wojciech; Meilhan, Jerome; Delplanque, Baptiste; Oden, Jonathan; Simoens, François

    2016-05-01

    This paper addresses the problem of critical operations in Degraded Visual Environment (DVE). DVE usually refer when the perception of a pilot is degraded by environmental factors, including the presence of obscurants from bad weather (e.g. fog, rain, snow) or accidental events (e.g. brownout, whiteout, smoke). Critical operations in DVE are a growing field of research as it is a cause of numerous fatal accidents for operational forces. Due to the lack of efficient sources and sensors in the Terahertz (THz) region, this domain has remained an unexplored part of the electromagnetic spectrum. Recently, the potential use of sub-Terahertz waves has been proposed to see through dense clouds of obscurants (e.g. sand, smoke) in DVE conditions. In order to conduct a performance evaluation of sub-Terahertz systems, several sub-terahertz systems (e.g. bolometer-array cameras, liquid helium cooled bolometers) were operated in artificial controlled DVE conditions at ONERA facilities. The purpose of this paper is to report field experiments results in controlled DVE conditions: attenuation measurements from 400 GHz to 700 GHz with a performance evaluation of different sub-Terahertz systems are presented.

  8. Design of automatic real-time system with solar panels for sun tracking%太阳能电池自动实时逐日系统设计

    Institute of Scientific and Technical Information of China (English)

    蔡荣山; 杨勇; 张虹; 姚桔

    2016-01-01

    采用非易失实时时钟芯片DS12C887配合SPA算法,精确获取所在地实时太阳方位;单片机根据光功率评估电池方位驱动后所获电能及驱动耗电,优化驱动的时间间隔;不驱动时,系统掉电.该方案具有断电重启方便,实时跟踪,太阳能电池效能高的优势,具有一定的应用价值.%This scheme uses a nonvolatile real-time clock chip DS12C887 to precisely obtain realtime position of the sun by adopting SPA algorithm.SCM assesses the obtained electrical energy and driving energy consumption according to the optical power after the direction driving of the solar cell,and then optimizes the intervals of the driving.The system is in a brown-out condition when it is not driving.This scheme has the following advantages:convenient re-initialization after outage,real-time sun-tracking function,efficient solar cells and some application values.

  9. 配电网可靠性影响因素分析与提升措施探讨%Factors affecting of distribution network reliability and its promotion measures

    Institute of Scientific and Technical Information of China (English)

    王浩浩

    2014-01-01

    Statistical analysis of the impact on the level of distribution network reliability insufficient system power brownouts, blackouts, and scheduled outage. In response to these factors, citing reduced outage frequency and timing of various measures, so as to improve the level of distribution network reliability purposes. These measures on the power supply enterprise have certain practical reference value.%统计分析出影响配电网可靠性水平的系统电源不足限电、故障停电以及预安排停电等因素的具体原因。针对这些影响因素,列举了减少各类停电次数及时间的措施,从而达到改善配电网可靠性水平的目的。这些措施对供电企业具有一定的现实参考意义。

  10. Operations managers conference: summary of proceedings. [Carmel, California, Feb. 13-15, 1979

    Energy Technology Data Exchange (ETDEWEB)

    None

    1980-02-01

    The fifth AESOP Operations Managers Conference was held in Carmel, California on February 13-15, 1979. The keynote address dealt with the changing role of the computer operations manager. Representatives presented contrasting approaches to managing the procurement and installation of new computer systems. The advantages and disadvantages of maintaining strong internal management support and good communication with the vendor and of increasing the involvement of broad-based planning committees and operations personnel in the computer procurement process were discussed. Two promising management programs, the PEER and 10/40 systems proved effective in improving employee morale by reducing job fragmentation, increasing internal mobility and modifying the work week. The topic of unionization of operations personnel was also discussed. The uneasy relationship between computers and the energy shortage was also considered. Techniques for avoiding computer problems caused by blackouts and brownouts were presented. The difficulty of conserving power at a computer facility was also discussed. Presentations concerning the President's committee on ADP reorganizaion and methods for predicting trends in computer innovation were made. Abstracts and two-page summaries of the papers given are included in this report.

  11. Real-time image processing for passive mmW imagery

    Science.gov (United States)

    Kozacik, Stephen; Paolini, Aaron; Bonnett, James; Harrity, Charles; Mackrides, Daniel; Dillon, Thomas E.; Martin, Richard D.; Schuetz, Christopher A.; Kelmelis, Eric; Prather, Dennis W.

    2015-05-01

    The transmission characteristics of millimeter waves (mmWs) make them suitable for many applications in defense and security, from airport preflight scanning to penetrating degraded visual environments such as brownout or heavy fog. While the cold sky provides sufficient illumination for these images to be taken passively in outdoor scenarios, this utility comes at a cost; the diffraction limit of the longer wavelengths involved leads to lower resolution imagery compared to the visible or IR regimes, and the low power levels inherent to passive imagery allow the data to be more easily degraded by noise. Recent techniques leveraging optical upconversion have shown significant promise, but are still subject to fundamental limits in resolution and signal-to-noise ratio. To address these issues we have applied techniques developed for visible and IR imagery to decrease noise and increase resolution in mmW imagery. We have developed these techniques into fieldable software, making use of GPU platforms for real-time operation of computationally complex image processing algorithms. We present data from a passive, 77 GHz, distributed aperture, video-rate imaging platform captured during field tests at full video rate. These videos demonstrate the increase in situational awareness that can be gained through applying computational techniques in real-time without needing changes in detection hardware.

  12. Broadband sub-millimeter wave amplifer module with 38dB gain and 8.3dB noise figure

    Science.gov (United States)

    Sarkozy, S.; Leong, K.; Lai, R.; Leakey, R.; Yoshida, W.; Mei, X.; Lee, J.; Liu, P.-H.; Gorospe, B.; Deal, W. R.

    2011-05-01

    Broadband sub-millimeter wave technology has received significant attention for potential applications in security, medical, and military imaging. Despite theoretical advantages of reduced size, weight, and power compared to current millimeter-wave systems, sub-millimeter-wave systems are hampered by a fundamental lack of amplification with sufficient gain and noise figure properties. We report on the development of a sub-millimeter wave amplifier module as part of a broadband pixel operating from 300-350 GHz, biased off of a single 2V power supply. Over this frequency range, > 38 dB gain and antenna and diode detector. The low noise amplifier Sub-Millimeter-wave Monolithic Integrated Circuit (SMMIC) was originally developed under the DARPA SWIFT and THz Electronics programs and is based on sub 50 nm Indium Arsenide Composite Channel (IACC) transistor technology with a projected maximum oscillation frequency fmax > 1.0 THz. This development and demonstration may bring to life future sub-millimeter-wave and THz applications such as solutions to brown-out problems, ultra-high bandwidth satellite communication cross-links, and future planetary exploration missions.

  13. Multisensory cueing for enhancing orientation information during flight.

    Science.gov (United States)

    Albery, William B

    2007-05-01

    The U.S. Air Force still regards spatial disorientation (SD) and loss of situational awareness (SA) as major contributing factors in operational Class A aircraft mishaps ($1M in aircraft loss and/or pilot fatality). Air Force Safety Agency data show 71 Class A SD mishaps from 1991-2004 in both fixed and rotary-wing aircraft. These mishaps resulted in 62 fatalities and an aircraft cost of over $2.OB. These losses account for 21 % of the USAF's Class A mishaps during that 14-yr period. Even non-mishap SD events negatively impact aircrew performance and reduce mission effectiveness. A multisensory system has been developed called the Spatial Orientation Retention Device (SORD) to enhance the aircraft attitude information to the pilot. SORD incorporates multisensory aids including helmet mounted symbology and tactile and audio cues. SORD has been prototyped and demonstrated in the Air Force Research Laboratory at Wright-Patterson AFB, OH. The technology has now been transitioned to a Rotary Wing Brownout program. This paper discusses the development of SORD and a potential application, including an augmented cognition application. Unlike automatic ground collision avoidance systems, SORD does not take over the aircraft if a pre-set altitude is broached by the pilot; rather, SORD provides complementary attitude cues to the pilot via the tactile, audio, and visual systems that allow the pilot to continue flying through disorienting conditions.

  14. Increasing situational awareness in DVE with advanced synthetic vision

    Science.gov (United States)

    Schafhitzel, T.; Hoyer, M.; Völschow, P.

    2013-05-01

    One of the major causes for hazardous situations in aviation is the lack of a pilot's situational awareness. Common causes for degraded situational awareness are Brownout and Whiteout situations, low level flights, and flights in DVE. In this paper, we propose Advanced Synthetic Vision (ASV), a modern situational awareness solution. ASV combines both Synthetic Vision and Enhanced Vision in order to provide the pilot most timeliness information without being restricted in the spatial coverage of the synthetic representation. The advantages to a common Enhanced Synthetic Vision System are the following: (1) ASV uses 3D ladar data instead of a 2D sensor. The 3D point cloud is classified in real-time to distinguish between ground, wires, poles and buildings; (2) the classified sensor data is fused with onboard data base contents like elevation or obstacles. The entire data fusion is performed in 3D, i.e. output is a merged 3D scenario instead of a blended 2D image. Once the sensor stopped recording due to occlusion, ASV switches to pure data base mode; (3) the merged data is passed to a 3D visualization module, which is fully configurable in order to support synthetic views on head down displays as well as more abstract augmented representations on helmet mounted displays; (4) the extendable design of ASV supports the graphical linking of functions like 3D landing aid, TAWS, or navigation aids.

  15. MMW radar enhanced vision systems: the Helicopter Autonomous Landing System (HALS) and Radar-Enhanced Vision System (REVS) are rotary and fixed wing enhanced flight vision systems that enable safe flight operations in degraded visual environments

    Science.gov (United States)

    Cross, Jack; Schneider, John; Cariani, Pete

    2013-05-01

    Sierra Nevada Corporation (SNC) has developed rotary and fixed wing millimeter wave radar enhanced vision systems. The Helicopter Autonomous Landing System (HALS) is a rotary-wing enhanced vision system that enables multi-ship landing, takeoff, and enroute flight in Degraded Visual Environments (DVE). HALS has been successfully flight tested in a variety of scenarios, from brown-out DVE landings, to enroute flight over mountainous terrain, to wire/cable detection during low-level flight. The Radar Enhanced Vision Systems (REVS) is a fixed-wing Enhanced Flight Vision System (EFVS) undergoing prototype development testing. Both systems are based on a fast-scanning, threedimensional 94 GHz radar that produces real-time terrain and obstacle imagery. The radar imagery is fused with synthetic imagery of the surrounding terrain to form a long-range, wide field-of-view display. A symbology overlay is added to provide aircraft state information and, for HALS, approach and landing command guidance cuing. The combination of see-through imagery and symbology provides the key information a pilot needs to perform safe flight operations in DVE conditions. This paper discusses the HALS and REVS systems and technology, presents imagery, and summarizes the recent flight test results.

  16. The end of cheap uranium.

    Science.gov (United States)

    Dittmar, Michael

    2013-09-01

    Historic data from many countries demonstrate that on average no more than 50-70% of the uranium in a deposit could be mined. An analysis of more recent data from Canada and Australia leads to a mining model with an average deposit extraction lifetime of 10±2 years. This simple model provides an accurate description of the extractable amount of uranium for the recent mining operations. Using this model for all larger existing and planned uranium mines up to 2030, a global uranium mining peak of at most 58±4 ktons around the year 2015 is obtained. Thereafter we predict that uranium mine production will decline to at most 54±5 ktons by 2025 and, with the decline steepening, to at most 41±5 ktons around 2030. This amount will not be sufficient to fuel the existing and planned nuclear power plants during the next 10-20 years. In fact, we find that it will be difficult to avoid supply shortages even under a slow 1%/year worldwide nuclear energy phase-out scenario up to 2025. We thus suggest that a worldwide nuclear energy phase-out is in order. If such a slow global phase-out is not voluntarily effected, the end of the present cheap uranium supply situation will be unavoidable. The result will be that some countries will simply be unable to afford sufficient uranium fuel at that point, which implies involuntary and perhaps chaotic nuclear phase-outs in those countries involving brownouts, blackouts, and worse.

  17. The marginalization of "small is beautiful": Micro-hydroelectricity, common property, and the politics of rural electricity provision in Thailand

    Science.gov (United States)

    Greacen, Christopher Edmund

    This study analyzes forces that constrain sustainable deployment of cost-effective renewable energy in a developing country. By many economic and social measures, community micro-hydro is a superior electrification option for remote mountainous communities in Thailand. Yet despite a 20 year government program, only 59 projects were built and of these less than half remain operating. By comparison, the national grid has extended to over 69,000 villages. Based on microeconomic, engineering, social barriers, common pool resource, and political economic theories, this study investigates first, why so few micro-hydro projects were built, and second, why so few remain operating. Drawing on historical information, site visits, interviews, surveys, and data logging, this study shows that the marginal status of micro-hydro arises from multiple linked factors spanning from village experiences to geopolitical concerns. The dominance of the parastatal rural electrification utility, the PEA, and its singular focus on grid extension are crucial in explaining why so few projects were built. Buffered from financial consequences by domestic and international subsidies, grid expansion proceeded without consideration of alternatives. High costs borne by villagers for micro-hydro discouraged village choice. PEA remains catalytic in explaining why few systems remain operating: grid expansion plans favor villages with existing loads and most villages abandon micro-hydro generators when the grid arrives. Village experiences are fundamental: most projects suffer blackouts, brownouts, and equipment failures due to poor equipment and collective over-consumption. Over-consumption is linked to mismatch between tariffs and generator technical characteristics. Opportunities to resolve problems languished as limited state support focused on building projects and immediate repairs rather than fundamentals. Despite frustrations, many remain proud of "their power plant". Interconnecting and selling

  18. Automated Demand Response Approaches to Household Energy Management in a Smart Grid Environment

    Science.gov (United States)

    Adika, Christopher Otieno

    The advancement of renewable energy technologies and the deregulation of the electricity market have seen the emergence of Demand response (DR) programs. Demand response is a cost-effective load management strategy which enables the electricity suppliers to maintain the integrity of the power grid during high peak periods, when the customers' electrical load is high. DR programs are designed to influence electricity users to alter their normal consumption patterns by offering them financial incentives. A well designed incentive-based DR scheme that offer competitive electricity pricing structure can result in numerous benefits to all the players in the electricity market. Lower power consumption during peak periods will significantly enhance the robustness of constrained networks by reducing the level of power of generation and transmission infrastructure needed to provide electric service. Therefore, this will ease the pressure of building new power networks as we avoiding costly energy procurements thereby translating into huge financial savings for the power suppliers. Peak load reduction will also reduce the inconveniences suffered by end users as a result of brownouts or blackouts. Demand response will also drastically lower the price peaks associated with wholesale markets. This will in turn reduce the electricity costs and risks for all the players in the energy market. Additionally, DR is environmentally friendly since it enhances the flexibility of the power grid through accommodation of renewable energy resources. Despite its many benefits, DR has not been embraced by most electricity networks. This can be attributed to the fact that the existing programs do not provide enough incentives to the end users and, therefore, most electricity users are not willing to participate in them. To overcome these challenges, most utilities are coming up with innovative strategies that will be more attractive to their customers. Thus, this dissertation presents various

  19. Small pixel pitch MCT IR-modules

    Science.gov (United States)

    Lutz, H.; Breiter, R.; Eich, D.; Figgemeier, H.; Fries, P.; Rutzinger, S.; Wendler, J.

    2016-05-01

    It is only some years ago, since VGA format detectors in 15μm pitch, manufactured with AIM's MCT n-on-p LPE standard technology, have been introduced to replace TV/4 format detector arrays as a system upgrade. In recent years a rapid increase in the demand for higher resolution, while preserving high thermal resolution, compactness and low power budget is observed. To satisfy these needs AIM has realized first prototypes of MWIR XGA format (1024x768) detector arrays in 10μm pitch. They fit in the same compact dewar as 640x512, 15μm pitch detector arrays. Therefore, they are best suited for system upgrade purposes to benefit from higher spatial resolution and keep cost on system level low. By combining pitch size reduction with recent development progress in the fields of miniature cryocoolers, short dewars and high operating temperatures the way ahead to ultra-compact high performance MWIR-modules is prepared. For cost reduction MBE grown MCT on commercially available GaAs substrates is introduced at AIM. Recently, 640x512, 15μm pitch FPAs, grown with MBE have successfully passed long-term high temperature storage tests as a crucial step towards serial production readiness level for use in future products. Pitch size reduction is not limited to arrays sensitive in the MWIR, but is of great interest for high performance LWIR or 3rd Gen solutions. Some applications such as rotorcraft pilotage require superior spatial resolution in a compact design to master severe weather conditions or degraded visual environment such as brown-out. For these applications AIM is developing both LWIR as well as dual band detector arrays in HD-format (1280x720) with 12μm pitch. This paper will present latest results in the development of detector arrays with small pitch sizes of 10μm and 12μm at AIM, together with their usage to realize compact cooled IR-modules.

  20. NREL's Energy-Saving Technology for Air Conditioning Cuts Peak Power Loads Without Using Harmful Refrigerants (Fact Sheet)

    Energy Technology Data Exchange (ETDEWEB)

    2012-07-01

    This fact sheet describes how the DEVAP air conditioner was invented, explains how the technology works, and why it won an R&D 100 Award. Desiccant-enhanced evaporative (DEVAP) air-conditioning will provide superior comfort for commercial buildings in any climate at a small fraction of the electricity costs of conventional air-conditioning equipment, releasing far less carbon dioxide and cutting costly peak electrical demand by an estimated 80%. Air conditioning currently consumes about 15% of the electricity generated in the United States and is a major contributor to peak electrical demand on hot summer days, which can lead to escalating power costs, brownouts, and rolling blackouts. DEVAP employs an innovative combination of air-cooling technologies to reduce energy use by up to 81%. DEVAP also shifts most of the energy needs to thermal energy sources, reducing annual electricity use by up to 90%. In doing so, DEVAP is estimated to cut peak electrical demand by nearly 80% in all climates. Widespread use of this cooling cycle would dramatically cut peak electrical loads throughout the country, saving billions of dollars in investments and operating costs for our nation's electrical utilities. Water is already used as a refrigerant in evaporative coolers, a common and widely used energy-saving technology for arid regions. The technology cools incoming hot, dry air by evaporating water into it. The energy absorbed by the water as it evaporates, known as the latent heat of vaporization, cools the air while humidifying it. However, evaporative coolers only function when the air is dry, and they deliver humid air that can lower the comfort level for building occupants. And even many dry climates like Phoenix, Arizona, have a humid season when evaporative cooling won't work well. DEVAP extends the applicability of evaporative cooling by first using a liquid desiccant-a water-absorbing material-to dry the air. The dry air is then passed to an indirect

  1. Basic Research Needs for Superconductivity. Report of the Basic Energy Sciences Workshop on Superconductivity, May 8-11, 2006

    Energy Technology Data Exchange (ETDEWEB)

    Sarrao, J.; Kwok, W-K; Bozovic, I.; Mazin, I.; Seamus, J. C.; Civale, L.; Christen, D.; Horwitz, J.; Kellogg, G.; Finnemore, D.; Crabtree, G.; Welp, U.; Ashton, C.; Herndon, B.; Shapard, L.; Nault, R. M.

    2006-05-11

    As an energy carrier, electricity has no rival with regard to its environmental cleanliness, flexibility in interfacing with multiple production sources and end uses, and efficiency of delivery. In fact, the electric power grid was named ?the greatest engineering achievement of the 20th century? by the National Academy of Engineering. This grid, a technological marvel ingeniously knitted together from local networks growing out from cities and rural centers, may be the biggest and most complex artificial system ever built. However, the growing demand for electricity will soon challenge the grid beyond its capability, compromising its reliability through voltage fluctuations that crash digital electronics, brownouts that disable industrial processes and harm electrical equipment, and power failures like the North American blackout in 2003 and subsequent blackouts in London, Scandinavia, and Italy in the same year. The North American blackout affected 50 million people and caused approximately $6 billion in economic damage over the four days of its duration. Superconductivity offers powerful new opportunities for restoring the reliability of the power grid and increasing its capacity and efficiency. Superconductors are capable of carrying current without loss, making the parts of the grid they replace dramatically more efficient. Superconducting wires carry up to five times the current carried by copper wires that have the same cross section, thereby providing ample capacity for future expansion while requiring no increase in the number of overhead access lines or underground conduits. Their use is especially attractive in urban areas, where replacing copper with superconductors in power-saturated underground conduits avoids expensive new underground construction. Superconducting transformers cut the volume, weight, and losses of conventional transformers by a factor of two and do not require the contaminating and flammable transformer oils that violate urban safety

  2. Third Generation Flywheels for electric storage

    Energy Technology Data Exchange (ETDEWEB)

    Ricci, Michael, R.; Fiske, O. James

    2008-02-29

    frequency regulation, where Power Rings could cut costs, reduce fuel consumption, eliminate emissions, and reduce the need for new power plants. Other applications include hybrid diesel-electric locomotives, grid power quality, support for renewable energy, spinning reserve, energy management, and facility deferral. Decreased need for new generation and transmission alone could save the nation $2.5 billion per year. Improved grid reliability could cut economic losses due to poor power quality by tens of billions of dollars per year. A large export market for this technology could also develop. Power Ring technology will directly support the EERE mission, and the goals of the Distributed Energy Technologies Subprogram in particular, by helping to reduce blackouts, brownouts, electricity costs, and emissions, by relieving transmission bottlenecks, and by greatly improving grid power quality.

  3. The Hydrogen Economy Making the Transition to the Third Industrial Revolution and a New Energy Era

    Energy Technology Data Exchange (ETDEWEB)

    Jeremy Rifkin

    2006-07-01

    ;forever fuel'. It never runs out and produces no harmful CO{sub 2} emissions. Commercial fuel-cells powered by hydrogen are just now being introduced into the market for home, office and industrial use. Hitachi, Toshiba, and other companies will be introducing the first hydrogen fuel cell cartridges into retail stores around the world in 2007. The small hydrogen powered micro fuel cells will replace traditional batteries and provide mobile power for lap-top computers, cell phones, PDA's, Mp3 players, camcorders, portable DVD players, hand- held computers, video games, and digital cameras. With this new energy source, computers can be powered for days at a time, where existing battery technology lasts only a few hours before needing to be plugged back into the wall socket to be recharged. Similarly, manufacturing and service-related companies are just beginning to introduce stationary fuel cell power plants to provide back-up generation during periods of peak load or when the price of electricity on the grid becomes too expensive, or when the grid cannot keep up with demand surges, resulting in rolling brownout and blackouts. Indeed, when the massive 2002 power blackout shut down large parts of the Northeast and Midwestern part of the US and the New York City skyline went black, a newly erected skyscraper in Times Square remained fully lit and powered up because a stationary fuel cell power plant had been built into its infrastructure. The German company, Linde AG, recently introduced a hydrogen fuel cell power plant at the Munich airport. The hydrogen economy makes possible a broad redistribution of power, with far-reaching beneficial consequences for society. In the new era, businesses, municipalities and homeowners could become the producers as well as the consumers of their own energy so-called 'distributed generation'. Even the automobile itself is a 'power station on wheels' with a generating capacity of twenty kilowatts. Since the average