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1

Controlling hydraulic system costs  

Energy Technology Data Exchange (ETDEWEB)

Hydraulic system preventive maintenance is largely a matter of using the senses and common logic to spot signs of impending problems. The ability to recognize a potential malfunction can save a great deal of money in repairs and lost production.

Smiley, C.H.

1982-06-01

2

Hydraulic Remote Control For Hydraulic System Of An Agricultural Implement  

UK PubMed Central (United Kingdom)

A hydraulic control apparatus for a foldable farm implement has a first hydraulic control system is used to control weight transfer to a plurality of ground engaging tools mounted to stationary and wing frame sections of the farm implement. A second hydraulic system is used to fold and unfold the wing sections for placing the implement in a compact position for transport and storage. A hydraulic control is provided that interfaces with both hydraulic systems to control sequencing of the functions provided by the first and second hydraulic systems.

YUEN CORY ADRIAN; RYDER NICHOLAS

3

HYDRAULIC REMOTE CONTROL FOR HYDRAULIC SYSTEM OF AN AGRICULTURAL IMPLEMENT  

UK PubMed Central (United Kingdom)

A hydraulic control apparatus for a foldable farm implement has a first hydraulic control system is used to control weight transfer to a plurality of ground engaging tools mounted to stationary and wing frame sections of the farm implement. A second hydraulic system is used to fold and unfold the wing sections for placing the implement in a compact position for transport and storage. A hydraulic control is provided that interfaces with both hydraulic systems to control sequencing of the functions provided by the first and second hydraulic systems.

YUEN CORY; RYDER NICHOLAS

4

Control rod drive hydraulic system  

International Nuclear Information System (INIS)

This patent describes a hydraulic system for a control rod drive (CRD). It comprises a variable output-pressure CRD pump; a charging line disposed in flow communication between the CRD pump and the CRD; a purge line disposed in flow communication between the CRD pump and the CRD, and in parallel flow with the charging line; a hydraulic control unit (HCU) disposed in flow communication in the charging line between the isolation valve and the CRD and including in series flow in the charging line an HCU check valve and a normally closed scram valve, and a scram accumulator disposed therebetween for accumulating the scram fluid at the charging pressure during the charging mode; pressurizing means disposed in flow communication with the charging line downstream of the isolation valve and upstream of the scram valve; a pressure sensor operatively connected to the charging line and responsive to the scram pressure; control means operatively connected to the CRD pump, the isolation valve, and the pressure sensor, and being effective for: opening the isolation valve while the scram valve is closed when the scram pressure drops to the minimum scram pressure; and closing the isolation valve while the scram valve is closed when the scram fluid in the charging line and in the scram accumulator reaches the charging pressure

1991-03-27

5

Control rod drive hydraulic system  

Energy Technology Data Exchange (ETDEWEB)

A hydraulic system for a control rod drive (CRD) includes a variable output-pressure CR pump operable in a charging mode for providing pressurized fluid at a charging pressure, and in a normal mode for providing the pressurized fluid at a purge pressure, less than the charging pressure. Charging and purge lines are disposed in parallel flow between the CRD pump and the CRD. A hydraulic control unit is disposed in flow communication in the charging line and includes a scram accumulator. An isolation valve is provided in the charging line between the CRD pump and the scram accumulator. A controller is operatively connected to the CRD pump and the isolation valve and is effective for opening the isolation valve and operating the CRD pump in a charging mode for charging the scram accumulator, and closing the isolation valve and operating the CRD pump in a normal mode for providing to the CRD through the purge line the pressurized fluid at a purge pressure lower than the charging pressure.

Ose, Richard A. (San Jose, CA)

1992-01-01

6

Hydraulic system for controlling mechanized timbering  

Energy Technology Data Exchange (ETDEWEB)

The hydraulic system for controlling mechanized timbering contains a hydraulic winch whose rodfree cavity is connected by a main to the rod cavity of the hydraulic cylinder of the stand, while the rod-free cavity of the latter is connected to the pressure and overflow hydraulic lines through a support block. To improve operation, the main has an additional support block made in the form of a pressure gate valve and hydraulic lock installed in series whose control cavity is connected to the rod-free cavity of the hydraulic cylinder of the stand.

Livshits, V.I.; Fomin, V.I.; Nikolayev, G.V.; Podkorytov, Ye.I.

1980-04-30

7

Hydraulically powered dissimilar teleoperated system controller design  

Energy Technology Data Exchange (ETDEWEB)

This paper will address two issues associated with the implementation of a hydraulically powered dissimilar master-slave teleoperated system. These issues are the overall system control architecture and the design of robust hydraulic servo controllers for the position control problem. Finally, a discussion of overall system performance on an actual teleoperated system will be presented.

Jansen, J.F.; Kress, R.L.

1996-04-01

8

MECHANICALLY CONTROLLED HYDRAULIC SYSTEM FOR AN AGRICULTURAL IMPLEMENT  

UK PubMed Central (United Kingdom)

A hydraulic control apparatus for a foldable farm includes first hydraulic control system is used to control weight transfer to ground engaging tools mounted to a stationary and foldable wing frame sections. A second hydraulic system is used to fold and unfold the wing sections. A hydraulic control is provided that interfaces with both hydraulic systems to control sequencing of the functions provided by the first and second hydraulic systems. The first and second hydraulically systems have mechanically controlled valves to control the flow of hydraulic fluid to various lifting, folding, and down pressure cylinders.

YUEN CORY

9

Mechanically Controlled Hydraulic System For An Agricultural Implement  

UK PubMed Central (United Kingdom)

A hydraulic control apparatus for a foldable farm includes first hydraulic control system is used to control weight transfer to ground engaging tools mounted to a stationary and foldable wing frame sections. A second hydraulic system is used to fold and unfold the wing sections. A hydraulic control is provided that interfaces with both hydraulic systems to control sequencing of the functions provided by the first and second hydraulic systems. The first and second hydraulically systems have mechanically controlled valves to control the flow of hydraulic fluid to various lifting, folding, and down pressure cylinders.

YUEN CORY

10

ELECTRONICALLY CONTROLLED HYDRAULIC SYSTEM FOR AN AGRICULTURAL IMPLEMENT  

UK PubMed Central (United Kingdom)

A hydraulic control apparatus for a foldable farm includes first hydraulic control system is used to control weight transfer to ground engaging tools mounted to a stationary and foldable wing frame sections. A second hydraulic system is used to fold and unfold the wing sections. A hydraulic control is provided that interfaces with both hydraulic systems to control sequencing of the functions provided by the first and second hydraulic systems. The first and second hydraulic systems have electronically controlled valves to control the flow of hydraulic fluid to various lifting, folding, and down pressure cylinders.

YUEN CORY

11

Electronically Controlled Hydraulic System For An Agricultural Implement  

UK PubMed Central (United Kingdom)

A hydraulic control apparatus for a foldable farm includes first hydraulic control system is used to control weight transfer to ground engaging tools mounted to a stationary and foldable wing frame sections. A second hydraulic system is used to fold and unfold the wing sections. A hydraulic control is provided that interfaces with both hydraulic systems to control sequencing of the functions provided by the first and second hydraulic systems. The first and second hydraulic systems have electronically controlled valves to control the flow of hydraulic fluid to various lifting, folding, and down pressure cylinders.

YUEN CORY

12

Highly reliable electro-hydraulic control system  

International Nuclear Information System (INIS)

The unscheduled shutdown of nuclear power stations disturbs power system, and exerts large influence on power generation cost due to the lowering of capacity ratio; therefore, high reliability is required for the control system of nuclear power stations. Toshiba Corp. has exerted effort to improve the reliability of the control system of power stations, and in this report, the electro-hydraulic control system for the turbines of nuclear power stations is described. The main functions of the electro-hydraulic control system are the control of main steam pressure with steam regulation valves and turbine bypass valves, the control of turbine speed and load, the prevention of turbine overspeed, the protection of turbines and so on. The system is composed of pressure sensors and a speed sensor, the control board containing the electronic circuits for control computation and protective sequence, the oil cylinders, servo valves and opening detectors of the valves for control, a high pressure oil hydraulic machine and piping, the operating panel and so on. The main features are the adoption of tripling intermediate value selection method, the multiplying of protection sensors and the adoption of 2 out of 3 trip logic, the multiplying of power sources, the improvement of the reliability of electronic circuit hardware and oil hydraulic system. (Kako, I.)

1984-01-01

13

Hydraulic system for controlling a loaddriven actuator  

UK PubMed Central (United Kingdom)

2.1 Hydraulic systems (10) of the said type are used, e.g. in harvesters, to lower a harvesting attachment to a level at which it is supported with a predetermined force on the ground. In order to achieve this aim, conventional hydraulic systems are provided with a multiplicity of valves which are controlled in a complicated manner. 2.2 It is proposed to use a proportional pressure-relief valve as a pilot valve (20) for a main valve (18) permitting the lowering operation, which pilot valve (20) can be preloaded by means of a magnet (66) variable in its voltage. 2.3 Hydraulic systems (10) of this type are used in the positional control of harvesting attachments on harvesters.

Winkels Günter

14

TG 220 MW hydraulic control system diagnostics  

International Nuclear Information System (INIS)

The TG power output control system comprises a hydraulic and an electronic part. TG speed, power output or the main steam header pressure (HPK) depend on the steam flow at the turbine inlet. The steam admission into the turbine is controlled by four control valves and one by-pass valve in case of the HP part and by four capture flap valves in case of the LP part. The task of the SKODA K-220 MW turbine protection and control systems is to provide both the turbine speed and power output control to the setpoint value. Diagnostic measurements were aimed at getting an overview of both technical and functional states of all power output control elements. Principally, it can be stated that some deficiencies of a design nature originating from the manufacturer's factory were revealed and some other deficiencies related to hydraulic control elements functionality were identified more closely by the new method. 5 figs.

1996-01-01

15

Control system for hydraulic automatic clutch  

Energy Technology Data Exchange (ETDEWEB)

A control system is described for a hydraulic automatic clutch of a vehicle having an engine. The control system consists of: a hydraulic clutch; an engine revolution means for generating an engine revolution fluid pressure signal indicative of a revolution speed of the engine; a start adjustment valve means for generating a start adjustment fluid pressure signal in response to an electric signal; a starting valve means coupled with the engine revolution means and the start adjustment valve means for generating a start fluid pressure in response to the engine revolution fluid pressure signal and the start adjustment fluid pressure signal, the start fluid pressure being supplied to the clutch to engage same; and an electronic control unit means for controlling the electric signal to keep the clutch in a predetermined state regardless of a variation in the engine revolution fluid pressure signal when the engine idles with the vehicle at a standstill.

Kumura, H.; Tanaka, Y.; Abo, K.; Hirano, H.; Yamamuro, S.

1986-03-18

16

Hydraulic system for driving control rod  

International Nuclear Information System (INIS)

Purpose: To protect a control rod drive hydraulic system from corrosion and stress corrosion cracking by recirculating in the system the filtrate which has been treated in a coolant cleanup system to bring dissolved oxygen content within certain limits. Constitution: The coolant for a pressure vessel is passed through a coolant cleanup system, regenerative heat exchanger, and nonregenerative heat exchanger to be cooled down to about 500C. Then it is cleaned by a filtrator-desalter, heated again by the regenerative heat exchanger, fed into feed water line, and returned to the pressure vessel. The input line of the control rod drive hydraulic system is connected on the rear of the filtrator-desalter. Part of the coolant having controlled dissolved oxygen content is used in the hydraulic system as filling water, driving water, and cooling water. The reactor return line is connected on the front of the secondary side of the regenerative heat exchanger, so as to relieve the thermal stress applied to the pressure vessel. (Nakamura, S.)

1979-01-01

17

Control Reconfigurability of Bilinear Hydraulic Drive Systems  

DEFF Research Database (Denmark)

The objective of the methods within the framework of the plug and play process control and particularly fault tolerant control is to establish control techniques which guarantee a certain performance through control reconfiguration at the occurrence of the faults or changes. These methods cannot be effective if sufficient redundancy does not exist in the process. A measure for control reconfigurability which reveals the level of redundancy in connection with feedback control is proposed in this paper for bilinear systems. The proposed control reconfigurability measure is the extension of its gramian-based analogous counterpart, which has been previously proposed for the linear processes. The control reconfigurability is calculated for the bilinear models of an electro-hydraulic drive to show its relevance to redundant actuating capabilities in the models.

Shaker, Hamid Reza; Tahavori, Maryamsadat

2011-01-01

18

Control issues for a hydraulically powered dissimilar teleoperated system  

Energy Technology Data Exchange (ETDEWEB)

This paper will address two issues associated with the implementation of a hydraulically powered dissimilar master-slave teleoperated system. These issues are the overall system control architecture and the design of robust hydraulic servo controllers for the position control problem. Finally, a discussion of overall system performance on an actual teleoperated system will be presented. (Schilling`s Titan II hydraulic manipulators are the slave manipulators and the master manipulators are from the Oak Ridge National Laboratory-developed Advanced Servo Manipulator.)

Jansen, J.F.; Kress, R.L.

1995-12-31

19

Hydraulic system for driving control rods  

International Nuclear Information System (INIS)

Purpose: To enable safety reactor shut down upon occurrence of an abnormal excess pressure in a hydraulic control unit. Constitution: The actuation pressure for a pressure switch that generates a scram signal is set lower than the release pressure set to a pressure release valve. Thus, if the pressure of nitrogen gas in a nitrogen container increases such as upon exposure of the hydraulic control unit to a high temperature, the pressure switch is actuated at first to generate the scram signal and a scram valve is opened to supply water at high pressure to control rod drives under the driving force of the nitrogen gas at high pressure to rapidly insert the control element into the reactor and shut down it. If the pressure of the nitrogen gas still increases after the scram, the pressure release valve is opened to release the nitrogen gas at high temperature to the atmosphere. Since the scram is attained before the actuation of the pressure release valve, safety reactor shut down can be attained and the hydraulic control unit can be protected. (Sekiya, K.)

1980-11-07

20

Hydraulic system of control of a powered support  

Energy Technology Data Exchange (ETDEWEB)

The objective of the invention is to increase reliability of the hydraulic system. This is achieved as follows. The control cavity of the pilot controlled check valve is connected to its input and to the piston-free cavity of the transfer hydraulic cylinder via a check valve, and the output is connected to one of the pressure lines.

Monin, L.M.; Lokhov, Yu.B.

1981-02-10

 
 
 
 
21

Design of Transputer Controllers for Hydraulic Actuator Systems.  

DEFF Research Database (Denmark)

The paper deals with how transputers can be applied for fast controllers for hydraulic actuator systems. A general transputer-based control systems including a data acquisition transputer subsystem is presented. An application case: development of a mechatronic test facility with a fast hydraulic test robot controlled by a transputer-basec controller is presented. Some experimental path-tracking results with adaptive control algorithms are presented and discussed. The results confirm that transputers have significant advantages for intelligent control of actuator systems and robots for high speed and precision tasks.

Conrad, Finn

1996-01-01

22

Integrated hydraulic system  

Energy Technology Data Exchange (ETDEWEB)

An integrated hydraulic system is described for a vehicle having a propulsion engine comprising a first fixed capacity or displacement hydraulic pump. A steering mechanism hydraulically operating circuit supplies the hydraulic fluid delivered by the first hydraulic pump into a steering mechanism. It also comprises a second fixed capacity or displacement hydraulic pump. A work implement hydraulically operating circuit selectively supplies the hydraulic fluid delivered by the second hydraulic pump through a pilot operated directional control valve into the steering mechanism hydraulically operating circuit and/or the work implement hydraulically operating circuit.

Karakama, T.

1987-01-06

23

Hydraulic control apparatus for hydraulically-operated power transmitting system having continuously variable transmission  

Energy Technology Data Exchange (ETDEWEB)

A hydraulic control apparatus is described for controlling a hydraulically-operated power transmitting system for an automotive vehicle, the power transmitting system including a continuously variable transmission and an auxiliary transmission coupled to the continuously variable transmission, the auxiliary transmission having a first and second forward-drive position corresponding to a high and a low speed range, respectively, which high and low speed ranges are selected by an operator controlled shift lever. The hydraulic control apparatus consists of: a shift valve controlled by an electric control signal so as to be placed selectively in one of a high-range position and a low range position to place the auxiliary transmission in the first and second forward-drive positions, respectively, the shift valve comprising lock means for holding the shift valve in the high-range position, irrespective of the electric control signal, while the high speed range is selected by the shift lever.

Itoh, H.

1987-08-11

24

Hydraulic line pressure control system for an infinitely variable transmission  

Energy Technology Data Exchange (ETDEWEB)

An improved control system is described for an infinitely variable transmission for transmitting the power of an internal combustion engine mounted on a vehicle. The transmission comprises: a primary pulley having a hydraulically shiftable disc and a hydraulic cylinder for shifting the disc, a secondary pulley having a hydraulically shiftable disc and a hydraulic cylinder for operating the disc, a belt engaged with both pulleys, and a hydraulic circuit having a pump for supplying oil. It also comprises: a transmission ratio control valve responsive to engine speed for controlling the oil and for shifting the disc of the primary pulley to change the transmission ratio, and a pressure regulator valve responsive to the transmission ratio for increasing the line pressure of the hydraulic circuit with increase of the transmission ratio. The improvement described here comprises: first means comprising a throttle position sensor for detecting the torque of the engine and an electronic circuit responsive to an output signal of the throttle position sensor for producing a control signal proportional to the torque; and second means responsive to the control signal for operating the pressure regulator valve so as to increase the line pressure with increase of the torque.

Sakai, Y.

1987-01-27

25

Control of fittings and hydraulic systems  

Energy Technology Data Exchange (ETDEWEB)

This sequel discusses the connection in series of boilers. Frequent switching operations are avoided by a buffer heat storage. The plant has a simple control system but has the disadvantage of high investment costs and floor space requirements. Serial connection according to burner loads is advantageous in modulating burners. Serial connection with continuous flow, on the other hand, may become interesting again as the stand-by losses of modern boilers get lower. Control functions are realized by software linking of systems. The article describes control systems with freely programmable software and presents guidelines for concept selection. Once the concept of serial connection has reached the implementation stage, a number of auxiliary services must be considered. Finally, rated values and time constants should be optimized in service. (BR).

Bolfing, L.

1988-08-01

26

International Space Station power module thermal control system hydraulic performance  

Energy Technology Data Exchange (ETDEWEB)

The International Space Station (ISS) uses four photovoltaic power modules (PVMs) to provide electric power for the US On-Orbit Segment. The PVMs consist of photovoltaic arrays (PVAs), orbit replaceable units (ORUs), photovoltaic radiators (PVRs), and a thermal control system (TCS). The PVM TCS function is to maintain selected PVM components within their specified operating ranges. The TCS consists of the pump flow control subassembly (PFCS), piping system, including serpentine tubing for individual component heat exchangers, headers/manifolds, fluid disconnect couplings (FQDCs), and radiator (PVR). This paper describes the major design requirements for the TCS and the results of the system hydraulic performance predictions in regard to these requirements and system component sizing. The system performance assessments were conducted using the PVM TCS fluid network hydraulic model developed for predicting system/component pressure losses and flow distribution. Hardy-Cross method of iteration was used to model the fluid network configuration. Assessments of the system hydraulic performance were conducted based on an evaluation of uncertainties associated with the manufacturing and design tolerances. Based on results of the analysis, it was concluded that all design requirements regarding system performance could be met. The hydraulic performance range, enveloping possible system operating parameter variations was determined.

Goldberg, V. [Boeing North American, Inc., Canoga Park, CA (United States). Rocketdyne Div.

1997-12-31

27

HYDRAULIC CONTROL SYSTEM FOR CHANGING TRACTOR PLOW DISC DIRECTION  

UK PubMed Central (United Kingdom)

The present invention relates to systems for changing the disc direction on a tractor plow by hydraulic control using a hydraulic cylinder, electric control using an electric cylinder, electric control using an electric motor, or pneumatic control using a pneumatic cylinder, or on a tractor plow having a hydraulic cylinder, tractor plow having an electric cylinder, tractor plow having an electric motor, or tractor plow having a pneumatic cylinder for changing the tractor plow disc direction. The invention also relates to the electricity distribution systems controlling the electrical systems for changing the plow disc direction. Said systems and said plows using hydraulic, electric, or pneumatic control make the work of the driver and farmer easier, help save time, help develop the agricultural sector and increase the yield thereof, and also help save energy.; The systems and plows also help reduce pollution and protect the environment by reducing fuel consumption while carrying out the same amount of work. They also contribute to work safety by preventing the risk of an accident wherein the tractor hits someone or something, or where the tractor falls over somewhere when the driver or farmer, through forgetfulness or negligence, turn around using the old lever system to change the tractor plow disc direction before stopping the tractor from moving.; Additionally, the systems and plows protect the health of the driver and farmer against serious problems involving the back muscles, vertebral column, and the discs and nerves in the back, as well as preventing serious spinal cord problems for the driver and farmer due to great, tiring, and repetitive physical muscular effort while in the uncomfortable turning position for operating the lever changing tractor plow disc direction using the old lever system.

KAMAL SAID

28

Development of a combined propeller control hydraulic system  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This thesis is temporally removed from Theseus. The subject of this Bachelor’s thesis was to design and build a hydraulic system to convert an adjustable propeller into a constant-speed propeller. The designed system was aimed to be an independent unit which has all the required hydraulic componen...

Lipponen, Antti

29

HYDRAULIC FLUID AND HYDRAULIC SYSTEM  

UK PubMed Central (United Kingdom)

A hydraulic fluid of the present invention contains, as a base oil, an ester having two or more ring structures, the two or more ring structures being at least one selected from an aromatic ring and a saturated naphthenic ring. Particularly, the hydraulic fluid contains an ester having two or more aromatic rings as the base oil. The hydraulic fluid has low energy loss due to compression and exhibits excellent responsiveness when being used in a hydraulic circuit. Consequently, the hydraulic fluid realizes energy-saving, high-speed operation and high precision of control in the hydraulic circuit.

TSUBOUCHI TOSHIYUKI

30

The safety analysis of hydraulic control rod drive system for nuclear reactor  

International Nuclear Information System (INIS)

[en] A new kind of hydraulic control rod drive system which is used for water cooling reactor is introduced. The safety and reliability of the system under various working conditions are analyzed. The safety property at the break of hydraulic circuit pipes of control rod system is also studied. It has been shown that the hydraulic stepping control rod drive system has intrinsic safety under various accidents

1992-01-01

31

DEVICE FOR AUTOMATIC CONTROL OVER HYDRAULIC SYSTEM OPERATION  

UK PubMed Central (United Kingdom)

FIELD: agriculture. ^ SUBSTANCE: invention refers to agricultural machine-building devices, in particular - to thrasher-harvesters and forage harvesters. The device for automatic control over a combine harvester hydraulic system operation contains pressure sensors, a relay sensor, a sensor signal ADC, the relay sensor integrated circuit, a data processing unit, an acoustic signal, a indicator lamp and a display. The pressure sensors are installed in the chassis variator pump main, the reaper lifting main, the reel main and the discharge main. The relay sensor is located on the filter inlet nipple. Via the sensor signal ADC and the relay sensor integrated circuit the sensors are connected to the data processing unit. The data processing unit is connected to the acoustic signal, the indicator lamp and the display. ^ EFFECT: invention enables reduction of hydraulic system failures frequency, of combine harvesters and other machinery delay time, increase of their operation environmental safety due to timely elimination of working medium leakages and minimisation of its ingress into the environment. ^ 1 dwg

NIKOLAEV VLADIMIR ANATOL EVICH; TESTOV NIKITA ALEKSANDROVICH

32

Hydraulic-Ball (HY-Ball) Control System  

International Nuclear Information System (INIS)

The Hy-Ball control system consists of a large number of small tubes vertically penetrating the active core region; the tubes contain movable poison elements (either spherical or cylindrical), which are hydraulically lifted upward from within the active core region to increase core reactivity. Reactor water is the actuating fluid. Hy-Ball columns occupy fuel-element lattice positions in a homogeneous fuel-element configuration. This configuration, with finely subdivided control elements, practically eliminates local water-hole power peaking and provides good control of the radial power distribution. By limitation of the amount of reactivity controlled by a single Hy-Ball column assembly to 0.1% or less, it is unnecessary to operate the poison elements in any position other than either the fully-inserted or fully-withdrawn positions. Elimination of intermediate positions results in simplicity of the system and avoids the inherent axial power perturbation resulting from partially inserted control elements. Physics studies indicate that up to about 40% more power can be obtained from a Hy-Ball-controlled core than from a core with conventional control rods. Tests simulating all reactor operating conditions except radiation are being performed for evaluation of costs, operational characteristics and long-term reliability effects. (author)

1964-01-01

33

Modification Of Control System For Flow On Hydraulic Rabbit System Facility  

International Nuclear Information System (INIS)

[en] Had been modification control system on the hydraulic rabbit system facility is installed at floor +8 m in reactor building GA. Siwabessy. On the hydraulic rabbit system is used water for media transfer and media cooling from hot cell to irradiation position or from irradiation position to hot cell. Flow water to sent capsule target about 55 liters/minute. Flow meter type RS No. 185-9926 is installed in hydraulic rabbit system. The flow meters have specification : flow rate 5 to 100 liters/minute, maximum working pressure 10 bar, temperature range 5 to 60 oC and viscosity range 10 to 200 centistokes. The flow meter is installed on the pipe line upper pump of hydraulic rabbit system facility in room no.0626 floor +8 meter reactor building. After the flow meter installed, flow rate on the hydraulic rabbit system can measure direct, flow rate can be adjusted and result same as on the monitor

2000-01-00

34

Continuously variable transmission hydraulic control system having two pressure regulating valves  

Energy Technology Data Exchange (ETDEWEB)

A hydraulic control system is described for a continuously variable transmission having first and second variable-diameter pulleys provided on a first and a second shafts, a transmission belt connecting the first and second pulleys to transmit power from one of the first and second pulleys to the other, and a pair of hydraulic cylinders for changing an effective diameter of the pulleys engaging the belt. The hydraulic control system consists of: a hydraulic source delivering a pressurized fluid; a first pressure regulating device for regulating the pressurized fluid to apply a first line pressure to one of the hydraulic cylinders for controlling a tension of the transmission belt; flow control means for controlling flow of the fluid into the other hydraulic cylinder and flow of the fluid from the other hydraulic cylinder, thereby changing the effective diameters of the pulleys to vary a speed ratio of the transmission; a second pressure regulating device provided between the hydraulic source and the first pressure regulating device, and regulating the pressurized fluid to apply a second line pressure to the flow control means, the second line pressure being higher than a pressure in the other hydraulic cylinder or the first line pressure by a predetermined value; and releasing means for releasing the second pressure regulating device from its pressure regulating operation while the speed ratio of the transmission is changed with the fluid discharged from the other hydraulic cylinder, or while the speed ratio is held constant.

Sawada, D.; Sugaya, M.; Soga, Y.; Imai, R.

1987-08-11

35

Evaluation of Linear and Non-Linear Control Schemes Applied to a Hydraulic Servo System  

DEFF Research Database (Denmark)

Due to the innovation of low-cost electronics such as sensors, microcontrollers etc., the focus on highperformance motion control is increasing. This work focuses on position control of single-input single-output hydraulic servo-systems in general. A hydraulically actuated robotic manipulator is used as test facility acting as load for the hydraulic servo system. An experimentally verified non-linear model of the complete system has been developed and used to design a series of both linear and non-linear control schemes. The controllers from each category are compared with respect to design parameters such as performance, robustness and implementation

Andersen, Torben Ole; Hansen, Michael Rygaard

2005-01-01

36

Hydraulic system for the drive of control rod  

International Nuclear Information System (INIS)

Purpose: To remove thermal stress and improve safety by utilizing water discharged a driving device as a part of cooling water for the device upon driving of control rods. Constitution: A water drain valve is wholly closed and a flow stabilization valve is supplied with an amount of water necessary for driving control rods. Upon driving one control rod, an amount of water required for the driving is caused to flow to the relivant hydraulic control unit and the flow rate in the stabilization valve is reduced by an amount required for the driving to keep the flow rate constant in the flow control valve. Since Excess water conventionally returned to the pressure vessel is utilized as cooling water for the driving device of control rods, the pressure vessel nozzle can be saved. Accordingly, the thermal stress in the nozzle portion can be removed to significantly improve the safety. (Seki, T.)

1978-01-01

37

Fireproof Brake Hydraulic System.  

Science.gov (United States)

The feasibility of a fireproof two-fluid brake hydraulic system which utilizes nonflammable chlorotrifluoroethylene (CTFE) fluid in a dead ended brake hydraulic system mechanically isolated from the primary MIL-H-5606 hydraulic system was studied. Experim...

S. M. Warren J. R. Kilner

1981-01-01

38

Hydraulic system  

Energy Technology Data Exchange (ETDEWEB)

The object of the invention is to increase the reliability and ease of operation. The said object is attained in an arrangement whereby the filter block is made like a hydraulic cylinder with two outlets and a gravity-filter with a fine filter. The gravity filter has two compartments connected by a pipeline; the intake of the first is connected with the outlet of the hydraulic cylinder and the intake of the second compartment is connected with a tank. The fine filter is mounted at the outlet from the first compartment. This is also attained by mounting a jet pump parallel to the hydraulic cylinder. The intake of the pump is connected with one of the outlets of the hydraulic cylinder, the outlet with the tank; and the vacuum chamber is connected with the outlet of the second chamber of the gravity-filter.

Drugov, A.S.; Kuvshinov, V.M.; Merkulov, A.N.; Starichnev, V.V.

1981-01-01

39

Research on Simulation of Giant Forging Hydraulic Press Decoupling Control for Synchronous Control System  

Directory of Open Access Journals (Sweden)

Full Text Available A giant forging hydraulic press active synchronous control system is a mutually-coupled multi-input and multi-output system. To solve the elimination of the multi-channel interference, a multiple-input and multiple-output mathematical model center on active-beam is established; multi-channel synchronous decoupling control strategy is studied. The simulation results show that: the system eliminates the role of strong interference between multi-channel accesses to very good inhibitory effect of synchronization error, eliminating the system's external disturbance on the synchronization precision control impact.

Zhongwei Liu; Yingjian Deng; Xinliang Liu

2013-01-01

40

Study on Control Strategy of Electro-Hydraulic Servo Loading System  

Directory of Open Access Journals (Sweden)

Full Text Available Since extraneous torque is the key factor to affect the accuracy of electro-hydraulic servo loading system, the forming mechanism of extraneous torque was discussed in this work. And then several design methods of loading system controller based on modern control theory were introduced, such as internal model control, Cerebella model articulation control and adaptive backstepping control.

Ju Tian

2013-01-01

 
 
 
 
41

Servo-pump hydraulic control system performance and evaluation for CVT pressure and ratio control  

Energy Technology Data Exchange (ETDEWEB)

Fluid pumping losses are one of the major sources of torque loss in modern continuously variable transmissions (CVTs) due to the high pressures and flow rates required in the hydraulic control system. To reduce the magnitude of these losses, researchers at UC Davis have developed a servo-pump control system for CVTs designed for improved pressure and ratio controllability with minimal power consumption. This paper includes a description of the control system concept and configuration as well as an evaluation of the power draw of the system. The results of vehicle testing show that the servo-pump CVT control system reduces the control power required by more than 83%. Vehicle testing and simulation provide an estimate of the fuel economy gain that can be achieved using the servo-pump CVT control system in a hybrid-electric vehicle (HEV) application. (orig.)

Bradley, T.H.; Frank, A.A.

2002-07-01

42

Research of the Electro-hydraulic Servo System Based on RBF Fuzzy Neural Network Controller  

Directory of Open Access Journals (Sweden)

Full Text Available This article describes the composition and working principle of electro-hydraulic position servo control system, and establishes a systematic mathematical model. This article presents a controller which is based on Fuzzy neural networks for an electro-hydraulic speed governor. The design process of the RBF Fuzzy neural network control is introduced in detail. This controller which combines the advantages of the Fuzzy control and Neutral networks control can get the best PID parameters by self-adjustment on line. The simulation study proves that this control system has a better adaptability and can improve the control effect greatly.

Huaizhong Chen

2012-01-01

43

Co-Simulation Research of the Mechanical-Hydraulic-Control Coupling System of ITER Tractor  

International Nuclear Information System (INIS)

The virtual prototyping models of the mechanical, hydraulic and control system of the ITER tractor were built with CATIA, ADAMS and MATLAB/Simulink respectively according to its heavy load and high precision characteristics, and the data transfer between the different models was accomplished by the integration interface between different software. Consequently the virtual experimental platform for the multi-disciplinary co-simulation was established. A co-simulation study of the mechanical-hydraulic-control coupling system of the ITER tractor was carried out. The synchronization servo control of parallel hydraulic cylinders was implemented, and the tracking control of the preconcerted trajectory of the hydraulic cylinders was realized on the established experimental platform. This paper presents the optimization design and technology rebuilding for the complicated coupling system with its theoretic foundation and co-simulation virtual experimental platform.

2009-01-01

44

Co-Simulation Research of the Mechanical-Hydraulic-Control Coupling System of ITER Tractor  

Science.gov (United States)

The virtual prototyping models of the mechanical, hydraulic and control system of the ITER tractor were built with CATIA, ADAMS and MATLAB/Simulink respectively according to its heavy load and high precision characteristics, and the data transfer between the different models was accomplished by the integration interface between different software. Consequently the virtual experimental platform for the multi-disciplinary co-simulation was established. A co-simulation study of the mechanical-hydraulic-control coupling system of the ITER tractor was carried out. The synchronization servo control of parallel hydraulic cylinders was implemented, and the tracking control of the preconcerted trajectory of the hydraulic cylinders was realized on the established experimental platform. This paper presents the optimization design and technology rebuilding for the complicated coupling system with its theoretic foundation and co-simulation virtual experimental platform.

Yang, Xiuqing; Luo, Minzhou; Mei, Tao; Yao, Damao

2009-06-01

45

A study on the control of shock in the hydraulic system using the fluid device  

Energy Technology Data Exchange (ETDEWEB)

Reduction in pressure transients may be important in the hydraulic system and necessary to avoid failure and to improve the efficiency of operation. This study addresses the design and use of an orifice to provide the desired control of the hydraulic actuator system. The experimental apparatus is a model of an automobile shift system. Control is accomplished by installing four different diameter ratio of orifices at appropriate locations in the system. Experimental results show that the orifice can be used to obtain the control of shock and the control level depends on the orifice size, orifice type, operating conditions. (author). 13 refs., 8 figs., 1 tab.

Lee, J.S. [Chungbuk National University Graduate School, Cheongju (Korea); Lee, K.B.; Lee, C.G. [Chungbuk National University, Cheongju (Korea)

2000-11-01

46

Experimental study of the pressure discharge process for the hydraulic control rod drive system stepped cylinder  

International Nuclear Information System (INIS)

The pressure discharge process from the stepped cylinder of the Hydraulic Control Rod Drive System (HCRDS) was studied experimentally in the HCRDS experimental loop for the 200 MW Nuclear Heating Reactor (NHR-200). The results showed that the differential pressure between the outside and the inside of the stepped cylinder increased rapidly to the desired value so that the force induced by the differential pressure which pushes the out tube of stepped cylinder was large enough. Therefore, if the hydraulic control rod were jammed, the pressure could push the hydraulic control rod to overcome the frictional resistance to insert the control rod into the reactor core. The experimental results verified that this design would solve the problem of hydraulic control rod jamming during an accident. (author)

2002-01-01

47

Direct Drive Electro-hydraulic Servo Control System Design with Self-Tuning Fuzzy PID Controller  

Directory of Open Access Journals (Sweden)

Full Text Available According to the nonlinear and time-varying uncertainty characteristics of direct drive electro-hydraulic servo control system, a self-tuning fuzzy PID control method with speed change integral and differential ahead optimizing operator is put forward by combining fuzzy inference and traditional PID control in this paper.The rule of fuzzy logic is designed, the membership function of the fuzzy subsets is determined and lookup table method is used to correcte the PID parameters in real-time. Finally the simulation is conducted with the typical input signal, such as tracking step, sine etc. The simulation results show that?the self-tuning fuzzy PID control system can effectively improve the dynamic characteristic when the system is out of the range of the operating point compared with the traditional PID control system, there is obvious improvement in the indexes of rapidity, stability and accuracy,  and fuzzy self-tuning PID Control is more robust, and more suitable for direct drive electro-hydraulic servo system.

Wang Yeqin

2013-01-01

48

VEHICLE AUXILIARY HYDRAULIC SYSTEM.  

UK PubMed Central (United Kingdom)

An auxiliary hydraulic system for vehicles, in particular pick-up trucks, is configured to supply hydraulic fluid under pressure to both on-board and off-board auxiliary equipment such as snow plows, dump boxes and wood splitters. The auxiliary hydraulic system includes a multi-piston fluid pump with electrically selectable poppet valves and an associated microprocessor control that facilitates variable output so that a desired proportional flow can be supplied to the auxiliary equipment. The system also provides a switchable valve arrangement for directional control and an arrangement of fluid distribution pipes and detachable couplings so that a range of different auxiliary equipment can be quickly and simply connected to the system. A simple user interface is also included so that the operator can command the auxiliary equipment from either within or in close proximity to the vehicle.

HOLT LAURENCE J; LAVOIE PAUL

49

VEHICLE AUXILIARY HYDRAULIC SYSTEM  

UK PubMed Central (United Kingdom)

An auxiliary hydraulic system for vehicles, in particular pick-up trucks, is configured to supply hydraulic fluid under pressure to both on-board and off-board auxiliary equipment such as snow plows, dump boxes and wood splitters. The auxiliary hydraulic system includes a multi-piston fluid pump with electrically selectable poppet valves and an associated microprocessor control that facilitates variable output so that a desired proportional flow can be supplied to the auxiliary equipment. The system also provides a switchable valve arrangement for directional control and an arrangement of fluid distribution pipes and detachable couplings so that a range of different auxiliary equipment can be quickly and simply connected to the system. A simple user interface is also included so that the operator can command the auxiliary equipment from either within or in close proximity to the vehicle.

HOLT LAURENCE J; LAVOIE PAUL

50

Electro Hydraulic Hitch Control  

DEFF Research Database (Denmark)

This paper present and discusses R&D results on electro hydraulic hitch control for off-road vehicle, in particular active damping of oscillation occuring on tractors. The research deals with analysis and control of the oscillations occuring on tractors which are design without any susspection system for agricultural applications and driving for transportation. During tranport phases, the lack of suspension causes the vehicle to bounce and pitch, and makes it difficalt to control. Many systems have been proposed to cope with the oscillatory behavior, and different solutions exist. Common for most of the systems are that they operate on the hydrailc actuators generally providing the motive forces for moving the implement and/or attachment, typically a plough. The basic idea and physical working principle are to use the implement, moveable relative to the vehicle, as a damper mass. The paper includes results on the phenomenon mention above on investigation with special focus on agricultucal tractors. For this purpose a mathematical model and its simulation model descibing the performance of the tractor with its mechanical linkages, and an attached implement. The model is in use as the basis for a parameter research study with emphasis on the requirements to the hitch control by use of hydraulic pressure compensated proportional control valve.

Hansen, M. R.; Andersen, T. O.

2003-01-01

51

Robust Adaptive Backstepping Control Design for a Nonlinear Hydraulic-Mechanical System  

DEFF Research Database (Denmark)

The complex dynamics that characterize hydraulic systems make it difficult for the control design to achieve prescribed goals in an efficient manner. In this paper, we present the design and analysis of a robust nonlinear controller for a nonlinear hydraulic-mechanical (NHM) system. The system consists of an electrohydraulic servo valve and two hydraulic cylinders. Specifically, by considering a part of the dynamics of the NHM system as a norm-bounded uncertainty, two adaptive controllers are developed based on the backstepping technique that ensure the tracking error signals asymptotically converge to zero despite the uncertainties in the system according to the Barbalat lemma. The resulting controllers are able to take into account the interval uncertainties in Coulomb friction parameters and in the internal leakage parameters in the cylinders. Two adaptation laws are obtained by using the Lyapunov functional method and inequality techniques. Simulation results demonstrate the performance and feasibility ofthe proposed method.

Choux, Martin; Karimi, Hamid Reza

2009-01-01

52

Pressure control in hydraulic systems with variable or constant pumps?  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The paper deals with electrohydraulic supply systems with variable (adjustable( supply pressures. Two control concepts are used in practice: the pressure control concept using a variable pump and constant speed of the driving electric motor as the commonly used concept, and the pressure control conc...

Lovrec, Darko; Ulaga, Samo

53

Control method and system for hydraulic machines employing a dynamic joint motion model  

Science.gov (United States)

A control method and system for controlling a hydraulically actuated mechanical arm to perform a task, the mechanical arm optionally being a hydraulically actuated excavator arm. The method can include determining a dynamic model of the motion of the hydraulic arm for each hydraulic arm link by relating the input signal vector for each respective link to the output signal vector for the same link. Also the method can include determining an error signal for each link as the weighted sum of the differences between a measured position and a reference position and between the time derivatives of the measured position and the time derivatives of the reference position for each respective link. The weights used in the determination of the error signal can be determined from the constant coefficients of the dynamic model. The error signal can be applied in a closed negative feedback control loop to diminish or eliminate the error signal for each respective link.

Danko, George (Reno, NV)

2011-11-22

54

Nonlinear, Adaptive and Fault-tolerant Control for Electro-hydraulic Servo Systems  

DEFF Research Database (Denmark)

Fluid power systems have been in use since 1795 with the rst hydraulic press patented by Joseph Bramah and today form the basis of many industries. Electro hydraulic servo systems are uid power systems controlled in closed-loop. They transform reference input signals into a set of movements in hydraulic actuators (cylinders or motors) by the means of hydraulic uid under pressure. With the development of computing power and control techniques during the last few decades, they are used increasingly in many industrial elds which require high actuation forces within limited space. However, despite numerous attractive properties, hydraulic systems are always subject to potential leakages in their components, friction variation in their hydraulic actuators and deciency in their sensors. These violations of normal behaviour reduce the system performances and can lead to system failure if they are not detected early and handled. Moreover, the task of controlling electro hydraulic systems for high performance operations is challenging due to the highly nonlinear behaviour of such systems and the large amount of uncertainties present in their models. This thesis focuses on nonlinear adaptive fault-tolerant control for a representative electro hydraulic servo controlled motion system. The thesis extends existing models of hydraulic systems by considering more detailed dynamics in the servo valve and in the friction inside the hydraulic cylinder. It identies the model parameters using experimental data from a test bed by analysing both the time response to standard input signals and the variation of the outputs with dierent excitation frequencies. The thesis also presents a model that accurately describes the static and dynamic normal behaviour of the system. Further, in this thesis, a fault detector is designed and implemented on the test bed that successfully diagnoses internal or external leakages, friction variations in the actuator or fault related to pressure sensors. The presented algorithm uses the position and pressure measurements to detect and isolate faults, avoiding missed detection and false alarm. The thesis also develops a high performance adaptive nonlinear controller for the hydraulic system which outperforms comparable linear controllers widely used in the industry. Because of the controller adaptivity, uncertainties in the model parameters can be handled. Moreover, a special attention is given to reduce the complexity of the controller in order to demonstrate its real-time implementation. Finally the thesis combines the techniques developed in fault detection and nonlinear control in order to develop an active fault-tolerant controller for electro hydraulic servo systems. In order to maintain overall service and performances as high as possible when a potential fault occurs, the fault-tolerant controlled system prognoses the fault and changes its controller parameters or structure. The consequences of an unexpected fault are avoided, high availability is ensured and the overall safety in electro hydraulic servo systems is increased.

Choux, Martin

2011-01-01

55

Composite hydraulic system  

Energy Technology Data Exchange (ETDEWEB)

A composite hydraulic system is described for a work vehicle having an implement hydraulic circuit and a steering hydraulic circuit comprising a first pump which supplies the implement hydraulic circuit primarily, a second pump which supplies the steering hydraulic circuit primarily, a third pump which is operable also as a motor and which transfers hydraulic fluid between the implement and the steering hydraulic circuits, an engine which operates the three pumps simultaneously, and servo system means whereby the third pump under at least one condition of operation operates as a motor to provide regeneration.

Williamson, W.A.

1987-03-17

56

Modeling and Controller Design of an Electro-Hydraulic Actuator System  

Directory of Open Access Journals (Sweden)

Full Text Available Problem statement: Electro-hydraulic actuators are widely used in motion control application. Its valve needs to be controlled to determine direction of the motion. Mathematical modeling is a description of a system in terms of equations. It can be divided into two parts; physical modeling and system identification. The objective of this study was to obtain mathematical model of an electro-hydraulic system using system identification technique by estimating model using System Identification Toolbox in MATLAB. Approach: Experimental works were done to collect input and output data for model estimation and ARX model was chosen as model structure of the system. The best model was accepted based on the best fit criterion and residuals analysis of autocorrelation and cross correlation of the system input and output. PID controller was designed for the model through simulation in SIMULINK. The controller is tuning by Ziegler-Nichols method. The simulation work was verified by applying the controller to the real system to achieve the best performance of the system. Results: The result showed that the output of the system with controller in simulation mode and experimental works were improved and almost similar. Conclusion/Recommendations: The designed PID controller can be applied to the electro-hydraulic system either in simulation or real-time mode. The self-tuning or automatic tuning controller could be developed in future work to increase the reliability of the PID controller.

M. F. Rahmat; S. M. Rozali; N. A. Wahab; Zulfatman; Kamaruzaman Jusoff

2010-01-01

57

Adaptive Backstepping Control of Nonlinear Hydraulic-Mechanical System Including Valve Dynamics  

Directory of Open Access Journals (Sweden)

Full Text Available The main contribution of the paper is the development of an adaptive backstepping controller for a nonlinear hydraulic-mechanical system considering valve dynamics. The paper also compares the performance of two variants of an adaptive backstepping tracking controller with a simple PI controller. The results show that the backstepping controller considering valve dynamics achieves significantly better tracking performance than the PI controller, while handling uncertain parameters related to internal leakage, friction, the orifice equation and oil characteristics.

M. Choux; G. Hovland

2010-01-01

58

The study on measures to improve the reliability of the hydraulic systems of shearers - study of measures to control the oil contamination of hydraulic systems  

Energy Technology Data Exchange (ETDEWEB)

The authors indicate that the failure rate of hydraulic systems of shearers can drop greatly, its reliability and service life can be increased by the use of a field oil contamination analyser and filter device to control the oil contamination of the hydraulic systems of shearers. Theoretical analysis and experimental provement of silting-theory contamination analyser are carried out. The filter effect of portable hydraulic driving oil-filter model YLJ-21 is examined in laboratory and field experiment. From January to August 1992, on-site experimental research using a silting-theory contamination analyser and oil-filter model YLJ-21 to control the oil contamination was carried out in the Daton Coal Mining Bureau. 3 refs., 3 figs., 6 tabs.

Xu, L.; Gao, X.; Du, C.; Song, Q.; Wu, Y.; Wu, X. [Central Coal Mining Research Institute (China)

1996-12-31

59

Fuzzy Immune PID Control of Hydraulic System Based on PSO Algorithm  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This paper takes the permanent magnet servo motor-driven hydraulic system as the research object. The hydraulic system power source uses servo motor instead of the original asynchronous motor, becoming a new energ...

Ma Yu; Gu Lichen

60

Fuzzy Immune PID Control of Hydraulic System Based on PSO Algorithm  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This paper takes the permanent magnet servo motor-driven hydraulic system as the research object. The hydraulic system power sour...

Ma Yu; Gu Lichen

 
 
 
 
61

Kinematic study on hydraulic control rod driving system for HR-200 heating reactor  

International Nuclear Information System (INIS)

[en] In order to analyse the performance on the Hydraulic Control Rod Driving System for HR-200 Heating Reactor and the factors affecting its performance and some possible improvements on this system, a method is presented, that is, at first to linearize the two-order nonlinear differential equations by neglecting the multi-powered small quantities or segmenting, then to solve the linearized differential equations by using Laplace transformation. The motion rule of the control rod near the balance position is found and a simple numerical method to calculate the rod's movement on any position is proposed. The theoretical analyses and comparisons with experimental results are conducted. Both the theoretical analyses and the experiments show that with certain structural improvements and parameters change, this Hydraulic Control Rod Driving System will be able to work properly on HR-200. The main factors affecting the system's performance are analyzed and some reasonable improving methods are proposed

1991-01-01

62

Electro-hydraulic control system for a dual-pass continuously variable transmission  

Energy Technology Data Exchange (ETDEWEB)

This patent describes a control system for controlling the hydraulic pressure in a dual-pass continuously variable transmission system having a plurality of drive paths from a power input to a power output, and a continuously variable component including first and second variable pulleys disposed respectively on first and second intermediate shafts, the transmission system having first and second clutches engagable to effect transition from a first drive path in which the first variable pulley is the driver pulley to a second drive path in which the second variable pulley is the driver pulley, the transmission system being releasable to effect a transition from the second drive path to the first drive path. It comprises means to provide a primary hydraulic pressure to each of the first and second variable pulleys; means for providing a secondary hydraulic pressure to each of the first and second variable pulleys; means for electrically regulating the primary and secondary pressures responsive to engine conditions; and means for directing the primary and secondary hydraulic pressures to the first and second variable pulleys in response to change of drive path.

Algrain, M.C.; Anderson, S.R.; Smirl, R.L.

1991-07-16

63

Design of Intelligent Hydraulic Excavator Control System Based on PID Method  

Science.gov (United States)

Most of the domestic designed hydraulic excavators adopt the constant power design method and set 85%~90% of engine power as the hydraulic system adoption power, it causes high energy loss due to mismatching of power between the engine and the pump. While the variation of the rotational speed of engine could sense the power shift of the load, it provides a new method to adjust the power matching between engine and pump through engine speed. Based on negative flux hydraulic system, an intelligent hydraulic excavator control system was designed based on rotational speed sensing method to improve energy efficiency. The control system was consisted of engine control module, pump power adjusted module, engine idle module and system fault diagnosis module. Special PLC with CAN bus was used to acquired the sensors and adjusts the pump absorption power according to load variation. Four energy saving control strategies with constant power method were employed to improve the fuel utilization. Three power modes (H, S and L mode) were designed to meet different working status; Auto idle function was employed to save energy through two work status detected pressure switches, 1300rpm was setting as the idle speed according to the engine consumption fuel curve. Transient overload function was designed for deep digging within short time without spending extra fuel. An increasing PID method was employed to realize power matching between engine and pump, the rotational speed's variation was taken as the PID algorithm's input; the current of proportional valve of variable displacement pump was the PID's output. The result indicated that the auto idle could decrease fuel consumption by 33.33% compared to work in maximum speed of H mode, the PID control method could take full use of maximum engine power at each power mode and keep the engine speed at stable range. Application of rotational speed sensing method provides a reliable method to improve the excavator's energy efficiency and realize power match between pump and engine.

Zhang, Jun; Jiao, Shengjie; Liao, Xiaoming; Yin, Penglong; Wang, Yulin; Si, Kuimao; Zhang, Yi; Gu, Hairong

64

A hydraulic control valve  

Energy Technology Data Exchange (ETDEWEB)

The closest in terms of engineering specifics to what is desired is a hydraulic valve control consisting of a housing with pressure, escape and control channels; a spring pressure valve; escape valve with guide piston and pusher coaxially mounted with the pressure valve. However, the housing of the escape valve is also an element of the pusher so that the housing has three cylindrical guides, thus requiring greater accuracy in its manufacture. The purpose of the invention is to increase the operational reliability of the device. This is attained in an arrangement whereby the hydraulic valve control is fitted with an additional guide piston placed inside the escape valve guide piston. The escape valve is made with an opening, inside of which a pusher is placed so that it may interphase periodically with the additional piston and pressure valve.

Polei, L.S.; Mikhailov, I.F.; Orekhov, A.V.; Shvyriaev, S.I.

1982-01-01

65

Hydraulic system for aircraft  

Energy Technology Data Exchange (ETDEWEB)

Present features and trend of aeronautic hydraulic system were explained by classifiyng the structure of system into 4 parts, those were power generation by oil pump, power transmission by piping, power control for the purpose, power conversion to output. As the characteristics of aeronautical application, multiplied systems for safety and effects of elevation of oil pressure on the miniaturing and weight reduction caused by the reduction of cross-section area of actuator and pipe diameter, were explained as the main trend. Concerning inflammable oil, transition of MIL specification was explained. Concerning pump, self-adjusting-to load type combined with computer control was taken as the promissing instrument to save energy. Quantitative analysis of the dynamic characteristics of the system by computer was explained by taking actual case as instance. (13 figs, 9 refs)

Tanaka, Hajime

1988-07-15

66

Hydraulic system contamination bibliography  

Energy Technology Data Exchange (ETDEWEB)

This bibliography brings together papers reporting work worldwide on oil contamination, and recommending ways of reducing its cost. Applications of the work are given in aerospace, marine industry, land transport, mobile equipment, mining, and production and finishing materials. All of the relevant literature received over the last ten years at BHRA the Fluid Engineering Centre, has been included. The resulting collection of some 630 items provides access to developments in understanding and control of hydraulic system contamination during a period of considerable activity in the field. The bibliography is classified by subject and contains both author and corporate source indexes.

Guy, N.G.

1988-01-01

67

Double Adaptive Fuzzy Sliding Mode Control Scheme for Electro-hydraulic Velocity Servo System  

Directory of Open Access Journals (Sweden)

Full Text Available Pointing on uncertainties in the velocity servo system, caused by servo system cant model accurately, may cause the deterioration of the control quality of the Electro-Hydraulic Velocity Servo System (EHVSS) and even lead to its instability. An Double Adaptive Fuzzy Sliding Mode Control (DAFSMC) algorithm is proposed for an EHVSS. The proposed control strategy has fast response and good disturbance rejection capability. The numerical simulation is presented to verify the effectiveness of the proposed control scheme. It is shown from the experimental results that the proposed controller offers several advantages such as fast response, good disturbance rejection capability, good velocity tracking capability and so forth. It is also revealed from simulation results that the proposed control strategy is valid for the EHVSS.

Rui Tang; Qi Zhang; Shao Jiang Wang

2012-01-01

68

Maintaining a hydraulic system  

Energy Technology Data Exchange (ETDEWEB)

A good preventive maintenance program that includes regularly scheduled inspections of the entire hydraulic system and its components is the first step in extending the life of expensive plant and mobile equipment. When considering hydraulic system maintenance requirements important factors are: use of the correct oil, ensure the pump is below the level of the hydraulic reservoir, when putting a new piece of equipment into service record the actual system pressures, flow rate of the pump and speed of the cylinders, design a realistic maintenance schedule.

1985-09-01

69

Control system developments for a range of kinematically redundant hydraulic manipulators  

International Nuclear Information System (INIS)

This paper describes a range of control system improvements developed and implemented for in-reactor use during the last three years. Novel control techniques have been developed to provide accurate closed-loop velocity control of pumped hydraulic manipulator joints under a wide range of operating conditions. As a result the supervisory computer system can provide accurate trajectory following, even when more than ten joints are required to move simultaneously. Accurately coordinated motion has given rise to some spectacular gains in in-reactor performance in terms of deployment time, safety and accessibility. The same low-level control improvements have made it feasible to integrate and use the 'geometric controller' to provide accurate resolved motion control of a kinematically redundant manipulator. Examples of recent in-reactor use of all these techniques are given. (author)

2000-01-01

70

Deterministic Control Strategy for a Hybrid Hydraulic System with Intermediate Pressure Line  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The paper introduces a new hydraulic system for mobile machines based on a constant pressure system with the aim to increase the efficiency of actuation of hydraulic cylinders. Using a third pressure level located between high pressure and tank pressure called intermediate pressure the system enable...

Dengler, Peter; Geimer, Marcus; Dombrowski, René von

71

Hydraulic System Acoustical Diagnostics.  

Science.gov (United States)

This project is a continuation of previous acoustics studies conducted to determine if the vibration signature of hydraulic components could provide information concerning the operational health of the system. The concept of using internally produced nois...

R. Inoue R. K. King

1980-01-01

72

Electrokinetic high pressure hydraulic system  

Energy Technology Data Exchange (ETDEWEB)

A compact high pressure hydraulic pump having no moving mechanical parts for converting electric potential to hydraulic force. The electrokinetic pump, which can generate hydraulic pressures greater than 2500 psi, can be employed to compress a fluid, either liquid or gas, and manipulate fluid flow. The pump is particularly useful for capillary-base systems. By combining the electrokinetic pump with a housing having chambers separated by a flexible member, fluid flow, including high pressure fluids, is controlled by the application of an electric potential, that can vary with time.

Paul, Phillip H. (Livermore, CA); Rakestraw, David J. (Fremont, CA)

2000-01-01

73

High Precision Position Control of Electro-Hydraulic Servo System Based on Feed-Forward Compensation  

Directory of Open Access Journals (Sweden)

Full Text Available The study is focused on an electro-hydraulic servo system which is a position control system. It is a non-minimum phase system when it was discretized with a certain sample time. To improve its tracking performance and extend its bandwidth, based on invariance principle, feed-forward compensation is developed by pole-zero placement theory for the system. The task is accomplished by transforming instable zero of the system into pole of the fitted closed-loop transfer function, forming the zero of feed-forward compensator and completing the compensation of the instable zero for the closed-loop system. The simulation and experimental results show the validity of the analytical results and the ability of the proposed algorithm to efficiently improve the system tracking performance and greatly extend system bandwidth.

Yao Jian-jun; Di Duo-tao; Jiang Gui-lin; Liu Sheng

2012-01-01

74

Decoupling Control Research on Test System of Hydraulic Drive Unit of Quadruped Robot Based on Diagonal Matrix Method  

Directory of Open Access Journals (Sweden)

Full Text Available The mathematical model of hydraulic drive unit of quadruped robot was built in this paper. According to the coupling characteristics between position control system and force control system, the decoupling control strategy was realized based on diagonal matrix method in AMESim?. The results of simulation show that using diagonal matrix method can achieve the decoupling control effectively and it can achieve the decoupling control more effectively with the method of not offset pole-zero in the S coordinate. This research can provide theoretical basis for the application of test system of hydraulic drive unit.

Lingxiao Quan; Wei Zhang; Bin Yu; Liang Ha

2013-01-01

75

Electrokinetic high pressure hydraulic system  

Energy Technology Data Exchange (ETDEWEB)

An electrokinetic high pressure hydraulic pump for manipulating fluids in capillary-based systems. The pump uses electro-osmotic flow to provide a high pressure hydraulic system, having no moving mechanical parts, for pumping and/or compressing fluids, for providing valve means and means for opening and closing valves, for controlling fluid flow rate, and manipulating fluid flow generally and in capillary-based systems (Microsystems), in particular. The compact nature of the inventive high pressure hydraulic pump provides the ability to construct a micro-scale or capillary-based HPLC system that fulfills the desire for small sample quantity, low solvent consumption, improved efficiency, the ability to run samples in parallel, and field portability. Control of pressure and solvent flow rate is achieved by controlling the voltage applied to an electrokinetic pump.

Paul, Phillip H. (Livermore, CA); Rakestraw, David J. (Fremont, CA); Arnold, Don W. (Livermore, CA); Hencken, Kenneth R. (Pleasanton, CA); Schoeniger, Joseph S. (Oakland, CA); Neyer, David W. (Castro Valley, CA)

2001-01-01

76

Thermal hydraulic system codes  

International Nuclear Information System (INIS)

A short summary is given on the so called thermal hydraulic system codes. Introducing this topic some elementary information is presented on thermal hydraulic phenomena occurring during accidents. Special attention will be paid to two-phase (gas-liquid) flow behavior and to the calculation of flows like that. The basic models of two-phase flow simulation is shown, and making use of the examples of SMABRE and CATHARE codes the main features of thermal hydraulic system codes are listed, including the basic equations, steps of code validation and verification and the cycle of code development strategy. In the conclusions an attempt will be made on the state-of-art description of the limitations and capabilities of thermal hydraulic codes. (author). 5 refs., 7 figs

1995-01-01

77

Automatic transmission hydraulic pressure control system with one-way fluid drain passage bypassing downshift timing subsystem  

Energy Technology Data Exchange (ETDEWEB)

This patent describes an automatic transmission mechanism comprising a first and a second hydraulic pressure actuated friction engaging device. The gear transmission mechanism provides a certain lower speed stage when the first friction engaging device is engaged by supply of actuating hydraulic fluid pressure thereto and the second friction engaging device is disengaged by non supply of actuating hydraulic fluid pressure thereto. The gear transmission mechanism also provides a certain higher speed stage when the first friction engaging device is disengaged by non-supply of actuating hydraulic fluid pressure thereto and the second friction engaging device is engaged by supply of actuating hydraulic fluid pressure thereto, a hydraulic fluid pressure control system, comprising: a speed shift valve having a first, a second, a third, a fourth, and fifth port;a downshift timing valve having a first port passage; an upshift timing valve having a second port passage, a sixth port, and a third valve element driven by a throttle pressure from a fifth position toward a sixth position against a force applied by a fluid pressure supplied to the sixth port; a first hydraulic pressure system for operating the first friction engaging device in relation to the second friction engaging device; and a second hydraulic pressure system for operating the second friction engaging device.

Sakai, T.; Minemoto, I.

1986-10-14

78

Hydraulic control system for automatic transmission with shockless 4-2 shifting  

Energy Technology Data Exchange (ETDEWEB)

A hydraulic control system is described for an automatic transmission which is shiftable into a nth speed ratio, a n+1th speed ratio and a a n+2th speed ratio. The automatic transmission includes a first friction unit and a second friction unit. The first friction unit is engaged and the second friction unit is released during operation with the nth speed ratio. The first and second friction units are engaged during operation with the n+1th speed ratio and the first friction unit is released and the second friction unit is engaged during operation with the n+2th speed ratio.

Sugano, K.

1986-10-21

79

Water Hydraulic Systems  

DEFF Research Database (Denmark)

The paper presents research results using IT-Tools for CAD and dynamic modelling, simulation, analysis, and design of water hydraulic actuators for motion control of machines, lifts, cranes and robots. Matlab/Simulink and CATIA are used as IT-Tools. The contributions include results from on-going research projects on fluid power and mechatronics based on tap water hydraulic servovalves and linear servo actuators and rotary vane actuators for motion control and power transmission. Development and design a novel water hydraulic rotary vane actuator for robot manipulators. Proposed mathematical modelling, control and simulation of a water hydraulic rotary vane actuator applied to power and control a two-links manipulator and evaluate performance. The results include engineering design and test of the proposed simulation models compared with IHA Tampere University’s presentation of research measurements from a similar robot manipulator driven by tap water hydraulic components. Experimental and simulation results are compared for evaluation and verification of developed mathematical models of the motion control of the manipulator. Furthermore, this paper presents the selected experimental results and performance results.

Conrad, Finn

2005-01-01

80

Fault tree analysis of control rod drop caused by failure of hydraulic system of control rod drive  

International Nuclear Information System (INIS)

Unplanned outage times per year is an important indicator of operation performance for power reactor. The hydraulic system of control rod drives is one of the key systems in a nuclear heating reactor. The unplanned outage will be directly caused by the system failure. The unplanned outage caused by the failure of components in the system will be discussed with the method of fault tree analysis. The issues will be concentrated on the setup of the fault tree, analyzing the probability of topmost event and giving some suggestions on improving the system design based on the fault tree analysis result

2002-01-01

 
 
 
 
81

Control strategy of hydraulic/electric synergy system in heavy hybrid vehicles  

International Nuclear Information System (INIS)

Energy consumption and exhaust emissions of hybrid vehicles strongly depend on the energy storage source and the applied control strategy. Heavy vehicles have the characteristics of frequent starts/stops and significant amounts of braking energy, which needs to find a more efficient way to store and use the high power flow. A novel parallel hybrid vehicles configuration consisting of hydraulic/electric synergy system is proposed to overcome the existing drawbacks of single energy storage source in heavy hybrid vehicles. A control strategy combining a logic threshold approach and key parameters optimization algorithm is developed to achieve acceptable vehicle performance while simultaneously maximizing engine fuel economy and maintaining the battery state of charge in its rational operation range at all times. The experimental and simulation results illustrate the potential of the proposed control strategy in terms of fuel economy and in keeping the deviations of SOC at high efficiency range.

2011-01-01

82

A study on the response time characteristics related to shock control in the hydraulic system using the fluid device  

International Nuclear Information System (INIS)

Control of pressure transients in a hydraulic system may be important and necessary to avoid failures and to improve the efficiency of operation. Flow restricting devices can result in a decrease in the peak pressure, but may change the response time. The response time has an important effect on both operator and operator perceived smoothness. The response time should correspond to how fast a system responds to a given disturbance at the system boundary. Occasionally the appropriate response time is not easily determined. This study is on the response time characteristics in the hydraulic system studied for the control of response time

2001-01-01

83

Control of a hydraulic system by means of a fuzzy approach  

Directory of Open Access Journals (Sweden)

Full Text Available Non linear models can be represented conveniently by Takagi-Sugeno fuzzy models when nonlinearities are bounded. This approach uses a collection of linear models which are interpolated by non linear functions. Then the global control law is the interpolation by the same functions of each feedback associated to each linear model. A Lyapunov approach enables to compute these feedback gains. The number of linear models depends directly on the number of nonlinearities the system has. The more models there are, the more difficult it is to guarantee the stability of the closed loop. This paper proposes a method to reduce the number of linear models by assuming a number of nonlinearities considered as uncertainties and to guarantee the global exponential stability of the system. This method is applied on a hydraulic system.

Mohamed Ksantini; Ameni Ellouze; Francois Delmotte

2013-01-01

84

Development of adaptive control system using the fuzzy theory for thermal-hydraulic analysis code, AQUA  

International Nuclear Information System (INIS)

[en] An adaptive control system using the Fuzzy theory has been implemented into the single-phase three-dimensional thermal-hydraulic analysis code AQUA. The system is designed to yield the optimum time step sizes as a control parameter. It fully utilizes the experiences accumulated by numerical experts: e.g., the use of a very small time step size when a symptom of instabilities appear. Asymtotic behaviors in the course of numerical integration due to AQUA are monitored by checking mass residual and relative variations for three velocity components u, v and w, turbulent parameters k and ? and enthalpy h every time step. The validity of overall idea could be interpreted by analogy with the fact experts in many industries are capable of operating plants without profound knowledge of the control characteristics. As a result of numerical experiments, the total CPU time has been reduced typically by 40% in comparison with the cases when the time step size is not controlled by the system. In general, the adaptive control system using the Fuzzy theory is an efficient measure to save computing efforts when one wishes to perform an extremely large scale simulation over a long transient time span. (author)

1988-01-01

85

Mechatronic System Design and Intelligent Motion Control of Hydraulic Robots and Machines  

DEFF Research Database (Denmark)

The paper presents an approach and concept to mechatronic system design and intelligent motion control. The Information Technology (IT) offers software and hardware for improvement of R&D Mechatronic Teams to create products and solutions for industrial applications. The latest progress in IT makes integration of an overall design and manufacturing IT- concept feasible and commercially attractive. An IT-tool concept for modelling, simulation and design of mechatronic products and systems is proposed in this paper. It built on results from a Danish mechatronic research program on intelligent motion control as well as from the Esprit project SWING on IT-tools for rapid prototyping of fluid power components and systems. A mechatronic test facility for a DTU-AAU hydraulic robot ¿Thor¿, and a CNC XY-machine table was implemented. The controller applies digital signal processors (DSPs). The DSP controller utilizes the dSPACE System suitable for real-time experimentation, evaluation and validation of control laws and algorithms.

Conrad, Finn; SØrensen, Torben

2003-01-01

86

Hydraulic system of harvesting machine  

UK PubMed Central (United Kingdom)

A cropper hydraulic system consists of an oil motor, a pipeline, a control valve, a manometer, a check valve, an oil bump, an oil filter, a safety valve, a throttling valve and an oil tank which are connected with each other the cropper hydraulic system is characterized in that the oil tank is connected with the oil filter, the oil bump and the check valve by the pipeline one circuit of the check valve is connected with the throttling valve and the control valve the other end of the control valve is connected with the oil motor by the pipeline the other end of the oil motor is connected with the control valve by the pipeline and the control valve is connected with the oil tank.

YIPING WEN

87

Linde Synchro-Control for mobile hydraulic applications  

Energy Technology Data Exchange (ETDEWEB)

This paper describes an advanced control system designed mainly for application in mobile hydraulic equipment. The system works with load sensing and provides major improvements when simultaneously operating different output functions on open-loop hydraulic circuits. (orig.).

Seelmann, H.

1989-12-01

88

An extravascular hydraulic system to control blood pressure by a feedback regulation of the venous return.  

Science.gov (United States)

Since increases in blood pressure may be effectively controlled by hydraulic feedback by reducing the venous return through the inferior vena cava in proportion to the blood pressure this principle was applied using a totally implantable extravascular system consisting of a periaortic blood pressure sensor and a pericaval cuff around the inferior vena cava. The two cuffs were supported externally by hard skeletons, filled with water, and connected directly to each other. The two devices were tested separately and together in 10 anaesthetised mongrel dogs with normal and high blood pressure induced by a metaraminol infusion. With the periaortic sensor an increase in blood pressure of 100 mmHg caused a mean(SD) isotonic volume displacement of 0.41(0.11) ml, and an increase in the pericaval balloon energy content of 100 ml.mmHg-1 caused a fall in blood pressure of 37.8(18.3)%. The whole system prevented an excessive rise in blood pressure when metaraminol was infused, with a feedback gain of about 2.8. It is concluded that blood pressure can be maintained at acceptable levels despite strong hypertensive stimuli, by this system, without additional treatment with drugs or an external energy source. The system is totally implantable and is applied extravascularly so that no anticoagulation is needed. PMID:3652100

Sideris, D A; Vardas, P E; Chrysos, D N; Toumanidis, S T; Michalis, L; Moulopoulos, S D

1987-05-01

89

Method and apparatus for controlling hydraulically-operated power transmitting system including continuously variable transmission  

Energy Technology Data Exchange (ETDEWEB)

A method is described of controlling a hydraulically-operated power transmitting system for an automotive vehicle, the power transmitting system including a continuously variable transmission and an auxiliary transmission coupled to the continuously variable transmission, the auxiliary transmission having speed-range positions. The method comprises the steps of: controlling a speed ratio of the continuously variable transmission and selectively placing the auxiliary transmission in one of speed-range positions, according to varying parameters of the vehicle; detecting simultaneous operations of the continuously variable transmission and the auxiliary transmission, which consist of a shift down action of the auxiliary transmission during a shift-down operation of the continuously variable transmission. A shift-up action of the auxiliary transmission occurs during a shift-up operation of the continuously variable transmission; and upon detection of the simultaneous operations, restrains a change in the speed ratio of the continuously variable transmission while the auxiliary transmission is in the shift-down action or the shift-up action.

Takada, M.; Itoh, H.; Hiramatsu, S.; Tamura, T.

1987-07-28

90

An intra-oral hydraulic system for controlled loading of dental implants.  

Science.gov (United States)

This study reports a method for controlling loads on an in vivo dental implant and its application for the investigation of early loading versus delayed loading of dental implants. The method was developed for the purpose of studying an ongoing hypothesis that amounts to bone loss around dental implants are related to mechanical-mediated adaptation of the alveolar bone. Using a customized intra-oral hydraulic system, the daily loading over a dental implant has been completed and recorded for six Sinclair swine. Each pig had a 5-month duration implant loading. During the experiments (loading), no analgesic treatment was supplied. The mean of the in vivo daily loadings was confirmed through an in vitro bench test after each animal was euthanized. Variations of the averaged loading input among the six animals were smaller than 10%. Preliminary data produced by the model suggests that cervical bone loss is less for early loading than for delayed loading. The current system is expected to provide a useful load control model for the study of alveolar bone adaptation around dental implants in relation to various loadings. PMID:12021009

Ko, Ching-Chang; Swift, James Q; DeLong, Ralph; Douglas, William H; Kim, Young Il; An, Kai-Nan; Chang, Chih-Han; Huang, Heng-Li

2002-06-01

91

Trends in Modelling, Simulation and Design of Water Hydraulic Systems – Motion Control and Open-Ended Solutions  

DEFF Research Database (Denmark)

The paper presents and discusses a R&D-view on trends in development and best practise in modelling, simulation and design of both low-pressure and high-pressure tap water hydraulic components and systems for motion control as well as open-ended solutions various industrial applications. The focus is on the advantages using ordinary tap water and the range of application areas are illustrated with examples, in particular within the food processing industry, humidification operations, water mist systems for fire fighting, high water pressure cleaners, water moisturising systems for wood processing, lumber drying process and mobile machines and equipment that operate in environmentally sensitive surroundings. Today’s progress in water hydraulics includes electro-water hydraulic proportional valves and servovalves for design of motion control solutions for machines and robots. The remarkable property is that the components operate with pure water from the tap without additives of any kind. Hence water hydraulicstakes the benefit of pure water as fluid being environmentally friendly, easy to clean sanitary design, non-toxic, non-flammable, inexpensive, readily available and easily disposable. The low-pressure tap water hydraulic systems cover up to around 50 bar, and 2-4 kW having a strong potential to compete with pneumatic and electrical solutions in many applications. The high-pressure water hydraulic systems cover typically up to 160 bar pressure from pump and to motors and actuators 140 bar. Recently, dedicated pumps and accessories running with sea-water as fluid are available. A unique solution is to use reverse osmosis to generate drinking water from sea-water, and furthermore for several off-shore applications. Furthermore, tap water hydraulic components of the Nessie® family and examples of measured performance characteristics are presented and the trends in industrial applications and need for future are discussed.

Conrad, Finn Technical University of Denmark,

2006-01-01

92

Hydraulic system and its components  

UK PubMed Central (United Kingdom)

1. Hydraulic system to supply fluid under pressure for a hydraulic device (18), the said system comprising a three-way valve comprising a fluid inlet (136) and two outlets, one outlet (22) for conveying the fuid to the hydraulic device and the second outlet (140) leading to the open air, characterized by the fact that the three-way valve is divided by an elastic membrane (124) into two chambers, one chamber (136) through which fluid flows and another chamber (126) controlling the membrane via a fluid, the said elastic membrane's first position linking up the first outlet (22) and the second outlet (140), i.e. linking the said device with the open air and shutting off the fluid supply, this shut off being achieved by a ball valve (146) controlled by the membrane, and its second position, under controlled pressure on the said membrane, shutting off the second outlet (40) and the link between the inlet (138) and the first outlet (22), i.e. between the inlet (138) and the said hydraulic device (18), in that a control distributor pumps fluid under pressure into the membrane control chamber (126), the said distributor possessing a mobile two-position shaft, a first position that the supply of fluid to the membrane control chamber is cut off and a second position allowing fluid to pass, and in that the control distributor rod (64) is driven by a mechanism (26) comprising a drive device (82), an oscillating cam (90) driven by the said drive device and a cam follower (94) in contact with the said cam and connected to the said rod (64) so that the movement of the cam is transmitted by the cam follower.

Turion Jean Claude

93

Hydraulic Motor Driving Variable-Pitch System for Wind Turbine  

Directory of Open Access Journals (Sweden)

Full Text Available The present hydraulic variable-pitch mechanism of wind turbine uses three hydraulic cylinders to drive three crank and connecting rod mechanisms respectively; the blades are moved with the cranks. The hydraulic variable-pitch mechanism has complex structure, occupies a lot of space and its maintenance is trouble. In order to make up for the shortcomings of hydraulic cylinder variable-pitch system, the present hydraulic variable-pitch mechanism should be changed as follows: hydraulic motors are used to drive gears; gears drive blades; the electro-hydraulic proportional valves are used to control hydraulic motors. The hydraulic control part and electrical control part of variable-pitch system is redesigned. The new variable-pitch system is called hydraulic motor driving variable-pitch system. The new variable-pitch system meets the control requirements of blade pitch, makes the structure simple and its application effect is perfect.    

Ye HUANG; JiBao QI

2013-01-01

94

The study on the hydraulic control rod driving system in cyclical swing  

International Nuclear Information System (INIS)

This paper discusses the behavior of the hydraulic control rod driving system (HCRDS) in cyclical swing. The first generation HCRDS with the hole-hole step cylinder, the important driving component, has been applied in 5 MW nuclear heating reactor for several years and run well all along. The second generation with the chamfer-hole step cylinder has also been developed and studied. The HCRDS working principle, as well as the particular design of the hole-hole step cylinder, has been introduced in the paper. The control rod (CR) behavior when HCDRS vacillating in certain swing and cycle has been analyzed subsequently. The calculating result indicates that the CR can keep its balance in such unstable state and the operation of driving CR upwards or downwards can function properly likewise. In cyclical swing, the CR can drop down quickly and meet the reactor shut-down needs. The theoretical analysis proves the HCRDS reliable and safe, establishing basement for its further research and wide use.

2007-01-01

95

Implement hydraulic system  

UK PubMed Central (United Kingdom)

A hydraulic implement system (100, 200) is provided that allows a load-sense power source (124, 224) to be activated and deactivated depending on a SCV (126, 226) function. The load sense power source (124, 224) is activated when wing cylinder structures (104, 204) are fully extended to maintain proper down force on the wings. It remains activated or latched when the SCV (126, 226) is returned to neutral. It is deactivated or unlatched when the wing cylinder structures (104, 204) are retracted. Two circuits have been devised to accomplish this latching function. Both of these latching circuits can be used with a sequencing circuit.

GRAHAM WILLIAM DOUGLAS; BARFELS AARON L

96

?????????????? ????????????? ??????????????? ??????? ??????????? ??????-??????? Mathematical modeling of the wheelchair hydraulic system  

Directory of Open Access Journals (Sweden)

Full Text Available ? ?????? ???????????? ?????????????? ?????? ??????????????? ???????, ?????????????? ?? ?????????? ??????-???????, ??????? ????????? ?????????? ???? ???????? ???? ??????????? ? ??????????? ?? ???????? ??????????? ??????? ??????????, ? ????? ?? ???????? ???????? ????????. ??????????????? ??????? ??????? ???????????? ???????? ?? ?????????? ???????? ??? ???????? ??????????? ?????? ?? ?????????????? ???????????.The article is offered the mathematical model of hydraulic system mounted on the wheelchair, which one allows to determine the angle of the hydraulic motor shaft rotation, according to velocity of the control levers moving as well as the presser drop. The questions of the specific factors influences on the transients are considered.

?. ?. ????????; ?. ?. ????????; ?. ?. ??????

2013-01-01

97

Integrating Experiment, Modeling and Design using a Hands on Hydraulic Positioning Laboratory for Mechanical Control Systems Education  

Science.gov (United States)

As part of a laboratory intensive curriculum, Mechanical Engineering students at California Polytechnic State University, San Luis Obispo are required to take a senior level class in Mechanical Control Systems. In addition to three one-hour lectures, students attend a weekly three hour laboratory session where course concepts are reinforced through hands-on modeling and experimentation. This paper describes a newly implemented and innovative laboratory experience which is centered on a hydraulic position control system. Often experiments in Mechanical Controls are heavily influenced by non-linearities such as friction or backlash which cause inexperienced students to lose confidence in linear system modeling as an effective analysis and design tool. A hydraulic system was chosen for this laboratory due to excellent correlation between experimental results and the linear modeling techniques taught in the course. This laboratory experience is designed to integrate linear system modeling techniques, experimentation and data collection, control system design, and design verification through physical testing using a variety of hardware and software tools. The main objectives of the laboratory are to give the students practice and confidence in advanced control system modeling, experience with precision hydraulic positioning systems, practice in designing Proportional-Integral (PI) controllers, exposure to digital control systems and experience and physical understanding of the sometimes dramatic condition of instability. The methodology includes a unique procedure that uses root locus concepts and asks the students to drive the system to instability to determine system parameters. The paper describes the laboratory experience in detail and gives some example results and an assessment of student learning.

Birdsong, Charles; Owen, Frank; Widmann, James; Ridgely, John

2009-08-11

98

Hydraulic management of a soil moisture controlled SDI wastewater dispersal system in an Alabama Black Belt soil.  

UK PubMed Central (United Kingdom)

Rural areas represent approximately 95% of the 14000 km(2) Alabama Black Belt, an area of widespread Vertisols dominated by clayey, smectitic, shrink-swell soils. These soils are unsuitable for conventional onsite wastewater treatment systems (OWTS) which are nevertheless widely used in this region. In order to provide an alternative wastewater dosing system, an experimental field moisture controlled subsurface drip irrigation (SDI) system was designed and installed as a field trial. The experimental system that integrates a seasonal cropping system was evaluated for two years on a 500-m(2) Houston clay site in west central Alabama from August 2006 to June 2008. The SDI system was designed to start hydraulic dosing only when field moisture was below field capacity. Hydraulic dosing rates fluctuated as expected with higher dosing rates during warm seasons with near zero or zero dosing rates during cold seasons. Lower hydraulic dosing in winter creates the need for at least a two-month waste storage structure which is an insurmountable challenge for rural homeowners. An estimated 30% of dosed water percolated below 45-cm depth during the first summer which included a 30-year historic drought. This massive volume of percolation was presumably the result of preferential flow stimulated by dry weather clay soil cracking. Although water percolation is necessary for OWTS, this massive water percolation loss indicated that this experimental system is not able to effective control soil moisture within its monitoring zone as designed. Overall findings of this study indicated that soil moisture controlled SDI wastewater dosing is not suitable as a standalone system in these Vertisols. However, the experimental soil moisture control system functioned as designed, demonstrating that soil moisture controlled SDI wastewater dosing may find application as a supplement to other wastewater disposal methods that can function during cold seasons.

He J; Dougherty M; Shaw J; Fulton J; Arriaga F

2011-10-01

99

14 CFR 25.1435 - Hydraulic systems.  

Science.gov (United States)

...design. Each element of the hydraulic system must be designed to...b) System design. Each hydraulic system must: (1) Have means located...or (ii) In the event of hydraulic system malfunction, corrective...

2009-01-01

100

14 CFR 29.1435 - Hydraulic systems.  

Science.gov (United States)

...systems. (a) Design. Each hydraulic system must be designed as follows: (1) Each element of the hydraulic system must be designed to withstand... (2) Each element of the hydraulic system must be designed to...

2010-01-01

 
 
 
 
101

A hydraulic valve control system and its application to turbocharged diesel engines  

Energy Technology Data Exchange (ETDEWEB)

The paper describes the development of a hydraulic variable valve motion system which has been used successfully to study the relationship between rate of exhaust valve opening and exhaust pulse energy with reference to exhaust turbocharging. The device may be configured to provide variation of timing, rate of opening or closing, or lift. Each of these variations could be achieved independently, for example, the start of valve opening could be varied without altering either the rate of opening or the full lift. The device is described in detail and preliminary experimental results are given. An alternative configuration in which the variation of motion may be achieved digitally is described.

Charlton, S.J.; Shafie-Pour, M.

1988-01-01

102

Design and Control of a Novel Hydraulically/Pneumatically Actuated Robotic System for MRI-Guided Neurosurgery  

Directory of Open Access Journals (Sweden)

Full Text Available In this paper the design of a novel modular hydraulic/pneumatic actuated tele-robotic system and a new infrastructure for MRI-guided intervention for closed-bore MRI-guided neurosurgery are presented. Candidate neurosurgical procedures enabled by this system would include thermal ablation, radiofrequency ablation, deep brain stimulators, and targeted drug delivery. The major focus is the application of the designed MR-compatible robotic system to MRI-guided brain biopsy. Navigation and operating modules were designed to undertake the alignment and advancement of the surgical needle respectively. The mechanical design and control paradigm are reported.

Cyrus Raoufi; Andrew A. Goldenberg; Walter Kucharczyk

2008-01-01

103

Controlling process of hydraulic loosening  

Energy Technology Data Exchange (ETDEWEB)

When water is injected into a coal seam to reduce the outburst hazard, it releases some of the potential energy which, if correctly controlled, may be used to loosen the seam. A method is described for injecting the coal seam based on regulating the water pressure and water feed from a high pressure pumping unit which ensures that the energy is released smoothly and so increases its industrial application and prevents the risk of an outburst occurring during the injection process. Using this method increases the zone of discharge (determined from the gas emission dynamics) by 1.5-2.0 m (compared to 0.5-1.0 m). Controlling the injection also enables the face area to be unloaded gradually during the hydraulic loosening while preventing the appearance of gas dynamic phenomena during the hydraulic treatment of the coal mass.

Balinchenko, I.I.; Goryagin, L.F.; Rezinchenko, A.I.

1985-01-01

104

Development of a quality management system for borehole investigations. (1) Quality assurance and quality control methodology for hydraulic packer testing  

International Nuclear Information System (INIS)

[en] A quality assurance and quality control (QA/QC) system for the hydraulic packer tests has been established based on the surface-based investigations at JAEA's underground research laboratories in Mizunami and Horonobe. The established QA/QC system covers field investigations (data acquisition) and data analysis. For the field investigations, the adopted procedure is selection of a test section based on a detail fluid logging and checking with tally list, followed by inspection of test tools such as pressure transducers and shut-in valves, etc., test method selection using a 'sequential hydraulic test' for deciding appropriate method, and finally data quality confirmation by pressure changes and derivatives on a log-log plots during testing. Test event logs should also be described during testing for traceability. For the test data analysis, a quick analysis for rough estimation of hydraulic parameters, and a detailed analysis using type curve and/or numerical analyses are conducted stepwise. The established QA/QC system has been applied to the recent borehole investigations and its efficiency has been confirmed. (author)

2011-01-01

105

Hydraulic system valving  

UK PubMed Central (United Kingdom)

A mine dusting machine having a specialized scoop constructed with a floor, opposite sides and ends and adapted for carrying substantially free-flowing particulate material, a powered ram on the scoop for pushing the material therein toward the front end of the scoop, a hydraulic motor powered auger conveyor mounted on the scoop adjacent said front end for transporting the material toward opposite sides of the scoop, separate material flingers mounted on said front end at least adjacent each of the sides and being hydraulically motor powered to receive the material transported thereto by the conveyor and then dispersing the material with considerable force in a generally arcuate pattern in a mine, wherein the motors are hydraulically connected in series to a pressurized hydraulic feed line and wherein each motor has a case drain port, a hydraulic return line connecting the last flinger motor of the series to a PTO, a primary check valve in the return line for preventing reverse flow therein, a motor case drain line connected into each case drain port of the series and connected into the return line upstream of the primary check valve, and a secondary check valve in the drain line intermediate its conjunction with the return line and the last of the flinger motors of the series for preventing over pressurization of the motor cases in the event of an operator caused accidental momentary reverse "HP" flow thru the primary, check valve which has become partially blocked open by dirt particles or the like in the hydraulic fluid.

TRAVIS TONNY D

106

Testing strata control systems without supports in paneling workings in hydraulic mines  

Energy Technology Data Exchange (ETDEWEB)

The Donugi investigated efficiency of strata control in development workings in hydraulic mines using roof bolting. The following bolt types were compared: the AD-1 wedge roof bolt, the ASP resin bonded roof bolt, the AV screw-in roof bolt and the AVK bonded screw-in bolt. Roof bolt design is shown in a scheme. Methods for bolt installation were analyzed. Use of the AV screw-in bolts for strata control in a development working driven by the Ural-38 heading machine is discussed. The working was 3 m wide. A timber roof bar was fastened to the roof by 3 roof bolts. Roof bar spacing of about 0.8 m was used. Boreholes for bolt installation were drilled using KBA drilling equipment. The AV roof bolts (used without anchor plates) were 1.2 m long. Borehole drilling took about 3 min, roof bolt installation 0.5 to 1.2 min. Use of the AV roof bolts guaranteed satisfactory strata control in the roadway for 2.5 months. The AV roof bolts were an economic method for efficient strata control; 1 roof bolt cost 0.68 rubles.

Krupin, N.N.; Papkov, M.I.; Stepanishchev, O.N.

1985-03-01

107

Auxiliary hydraulic system of walking transplanting machine  

UK PubMed Central (United Kingdom)

The utility model relates to an auxiliary hydraulic system of a walking transplanting machine, which aims to facilitate operation and control of the transplanting machine and is simple in structure and easy to manufacture. The technical scheme is that the auxiliary hydraulic system of the walking transplanting machine is characterized by comprising an oil tank, a hydraulic pump and an overflow valve which are communicated through oil conveying pipelines in sequence. Four sets of execution units are connected with the oil conveying pipelines between the hydraulic pump and the overflow valve in parallel mode, and each set of execution units respectively comprises an electromagnetic valve and a hydraulic cylinder communicated with oil pipelines through the electromagnetic valve. Hydraulic cylinder pistons in the four sets of execution units respectively fix a main clutch, a left clutch and a right clutch of the transplanting machine and a clutch line in a transplanting device control unit. An oil return pipeline in the overflow valve and an oil return pipeline in the electromagnetic valve are both connected into the oil tank. The electromagnetic valve is sequentially connected with a relay, an electric switch on a control panel and a storage battery through conductive lines respectively.

LINWEI ZHANG; QIAOHONG CHEN; XIAOQIANG DU; ZEHUA TANG; LIYUAN CAI; HUAJUN ZHANG; ZHELU WANG; ZHENGBAO DOU

108

A new approach to saving energy in cyclic loaded hydraulic systems: Learning hydraulic systems  

Energy Technology Data Exchange (ETDEWEB)

The main purpose of the research on the title subject was to develop and test a new energy saving concept for improving the efficiency of cyclic loaded hydraulic systems and for producing an automatic re-adjustment of the system to variable system and load conditions. In chapter 1 an overview of the different energy saving concepts which have been used in hydraulic transmissions until now is given. From this overview it appears that further energy saving measures are needed, especially for cyclic-variably loaded machines. The analysis of conventional energy saving measures in chapter 2 results in the formulation of the basic solution strategy, the Learning Hydraulic System. An essential part of the solution is optimization of the cyclic loaded hydraulic system for which a mathematical model is used. The Learning Hydraulic System cannot be used alone in practice; it needs to be supported. The analysis in chapter 3 of the problems that may occur in a practical situation results in the definition of the necessary supporting sub-procedures. Combining those sub-procedures results in a strategy for controlling the total system. In chapter 4, studies are described about the actual behaviour of an optimally controlled cyclic loaded hydraulic system. Verification of the theoretical results in practice is described in chapter 5. It is concluded that the proposed Learning Hydraulic System is appropriate for practical applications and energy can be saved. 39 figs., 7 tabs., 3 appendices, 63 refs.

Van der Burgt, J.A.H.

1994-03-14

109

Electokinetic high pressure hydraulic system  

Science.gov (United States)

A compact high pressure hydraulic system having no moving parts for converting electric potential to hydraulic force and for manipulating fluids. Electro-osmotic flow is used to provide a valve and means to compress a fluid or gas in a capillary-based system. By electro-osmotically moving an electrolyte between a first position opening communication between a fluid inlet and outlet and a second position closing communication between the fluid inlet and outlet the system can be configured as a valve. The system can also be used to generate forces as large as 2500 psi that can be used to compress a fluid, either a liquid or a gas.

Paul, Phillip H. (Livermore, CA); Rakestraw, David J. (Fremont, CA)

2000-01-01

110

Electrokinetic high pressure hydraulic system  

Energy Technology Data Exchange (ETDEWEB)

A compact high pressure hydraulic system having no moving parts for converting electric potential to hydraulic force and for manipulating fluids. Electro-osmotic flow is used to provide a valve and means to compress a fluid or gas in a capillary-based system. By electro-osmotically moving an electrolyte between a first position opening communication between a fluid inlet and outlet and a second position closing communication between the fluid inlet and outlet the system can be configured as a valve. The system can also be used to generate forces as large as 2500 psi that can be used to compress a fluid, either a liquid or a gas.

Paul, P.H.; Rakestraw, D.J.

2000-01-11

111

Hydraulic system of a support section  

Energy Technology Data Exchange (ETDEWEB)

The purpose of the invention is to simplify fulfillment of secondary operations. This goal is achieved in that the hydraulic system is equipped with an ILI valve and an additional controllable valve, whose input is connected to the line of support. The output is connected through the ILI valve to the fist and cavity of the hydraulic upright. The two-way controllable valve of the upright unit is made with an additional pusher, which forms a cavity which is connected to the channel of support section movement and to the cavity of the pusher of the additional controllable valve.

Poley, L.S.; Mikhaylov, I.F.; Morozov, V.S.; Nikolayev, S.V.; Nuzhnov, P.N.; Podkolzin, A.A.; Shvyryayev, S.I.; Sychev, V.T.

1982-01-01

112

Hydraulic control unit detection method and device  

International Nuclear Information System (INIS)

The present invention provides detection method and device for ensuring integrity of hydraulic control units of a BWR type power plant and shortening the term for plant periodical inspection. Namely, (1) the integrity of the hydraulic control units is confirmed based on the time required from the input of control rod driving signals to the hydraulic control units to the completion of the control rod operation, (2) the integrity of the hydraulic control units is confirmed based on the driving time per 1 notch of the notches formed on control rods, (3) the above-mentioned integrity is judged by setting the range of the time assumed as integral based on integral data previously measured and determining whether the above-mentioned time is within the predetermined range or not, (4) this operation is conducted during a periodical inspection, and inspection is conducted by disassembling only the hydraulic control unit which is judged to be not integral. (I.S.)

1996-10-22

113

Hydraulic control unit detection method and device  

Energy Technology Data Exchange (ETDEWEB)

The present invention provides detection method and device for ensuring integrity of hydraulic control units of a BWR type power plant and shortening the term for plant periodical inspection. Namely, (1) the integrity of the hydraulic control units is confirmed based on the time required from the input of control rod driving signals to the hydraulic control units to the completion of the control rod operation, (2) the integrity of the hydraulic control units is confirmed based on the driving time per 1 notch of the notches formed on control rods, (3) the above-mentioned integrity is judged by setting the range of the time assumed as integral based on integral data previously measured and determining whether the above-mentioned time is within the predetermined range or not, (4) this operation is conducted during a periodical inspection, and inspection is conducted by disassembling only the hydraulic control unit which is judged to be not integral. (I.S.)

Matsui, Yuji; Shigenaka, Naoto; Senoo, Makoto; Takahashi, Fuminobu

1998-05-15

114

Transputer Control of Hydraulic Actuators and Robots  

DEFF Research Database (Denmark)

Results from a Danish mechatronics research program entitled IMCIA - Intelligent Control and Intelligent Actuators. The objective is development of intelligent actuators for intelligent motion control. A mechatronics test facility with a transputer controlled hydraulic robot suiteable for real-time experiments and evaluation of control laws and algorithms is presented. Concepts of intelligent motion control and intelligent hydraulic actuators are proposed. Promising experimental path-tracking results obtained from model-based adaptive control algorithms are presented and discussed.

Conrad, Finn

1996-01-01

115

Improvement of Hydraulic Edge Position Control System by Proportion Sliding Mode of Self-tuning Switching Gain  

Directory of Open Access Journals (Sweden)

Full Text Available Aiming at the problem of tracking performance degradation of hydraulic EPC system caused by time-varying inertia parameters, nonlinear and external disturbances, the proportion sliding mode control of fuzzy self-tuning gain was proposed. The EPC system state space model on deviation parameters was established and the main feedback sliding mode switching algorithm was designed. The fuzzy method was used to dynamically adjust the proportion sliding mode switching gain by product of the switching function and its derivative state and to adaptive compensate for the uncertainty of the system. At the same time to ensure the effectiveness of the design strategy, the controller model and physical model worked together to simulate the actual conditions. The fixed switching gain switch was, respectively greater and smaller and compared with the fuzzy self-tuning gain, in which the latter achieves a fast and coordinated control of chattering. The results show that after comprehensive consideration all interference the system is stable, fast response, high accuracy and to solve chattering problem caused by the traditional large switching gain of proportion sliding mode.

Jin Baoquan; Chen Dongbing

2012-01-01

116

Drill fluid powered hydraulic system  

Energy Technology Data Exchange (ETDEWEB)

A rotary drill shaft driving system is decribed that is adapted to be connected to drill pipe providing a source of drill fluid to the system and useful for rotating a drill shaft having a bit connected at one end of the shaft, through the use of drill fluid supplied to said system, comprising: a motor driven by hydraulic fluid flowing in only one direction and connected to such shaft means for rotation of such shaft; drive means for supplying said hydraulic fluid flowing in said one direction; actuation means adapted to receive drill fluid from said source and responsive to flow of said drill fluid for actuating said drive means; and coordination means responsive to rotation of such shaft for synchronizing flow of drill fluid to said actuation means with supply of hydraulic fluid to said drive means, said drive means including: first supply means for holding and supplying only a fixed amount of said hydraulic fluid, and a first valve actuated by said coordination means for causing said flow of said fixed amount of said hydraulic fluid to be substantially smooth and unidirectional; said first supply means being in fluid flow communication with said first valve, said actuating means including: reciprocating sealed piston means, second supply means for receiving and supplying a fixed amount of said drill fluid, said piston means being located between said first and second supply means; and a second valve actuated by said coordination means and in fluid flow communication with said source of drill fluid and said second supply means, said second valve including an outlet and means for converting such discrete amounts of such drill fluid to a continuous flow of such drill fluid at said outlet.

Kellner, J.

1980-07-08

117

R ans D of water hydraulic systems in Ebara Research Co, Ltd; Ebara sogo kenkyujo ni okeru suiatsu system  

Energy Technology Data Exchange (ETDEWEB)

The water hydraulic system is a hydraulic system in which tap water is used as the energy transmission medium. The water hydraulic system has been attracting attention in many fields as a safe and clean technology. Ebara group has dealt with technologies related to `water` for some 90 years under the group policy of `water, air, and environment`. Besides, the group has experiences is business employing oil hydraulic system. The Ebara Central Research Laboratory started the technical development of water hydraulic driving system from the development of water hydraulic servo valve. Meanwhile the history of development of oil hydraulic system is `power hydraulic`, the water hydraulic system started from the concept of `controllable and intelligent water pressure`. Experimental results of synchronized control of biaxial cylinder and servo-control of water hydraulic motor are presented in order to show that the `intelligent` water hydraulic system can be constructed using the already developed `water hydraulic servo valve`. 12 refs., 12 figs.

Miyagawa, S

1998-11-15

118

Condition monitoring in hydraulic systems  

Energy Technology Data Exchange (ETDEWEB)

The ''run it until it breaks'' approach to maintenance is becoming increasingly unacceptable. Implementation of just-in-time and the economic requirements for more efficient use of labor and machinery are some of the factors encouraging management to give more than lip-service to preventive maintenance. A test unit developed to speed diagnosis of problems in hydraulic systems has proved to be a useful tool for predicting many failures, enabling repairs to be scheduled.

Dyer, C.

1986-01-01

119

Development of hydraulic brake actuator for active brake control; Active brake seigyoyo yuatsu booster no kaihatsu  

Energy Technology Data Exchange (ETDEWEB)

Recently, application of active brake control systems of the vehicle are increasing. (Vehicle stability control, Panic brake assist ) We have developed a new hydraulic brake actuator for active brake control systems. New hydraulic brake actuator is composed of the three parts. (Hydraulic booster unit, Power supply unit, Control valve unit) This report describes the construction of the new hydraulic booster unit. 2 refs., 10 figs.

Konishi, Y.; Hattori, M. Sugisawa, M.; Nishii, M. [Aisin Seiki Co. Ltd., Aichi (Japan)

1997-10-01

120

Hydraulic systems in the wood products industry  

Energy Technology Data Exchange (ETDEWEB)

Hydraulic systems are used in the wood products industry to power linear actuators and hydraulic motors. A study was conducted by the Canadian Electrical Association to determine the potential energy savings for hydraulic systems. It was estimated that in British Columbia, about 125,000 horsepower (hp) is used in hydraulic systems in the wood products industry. Of this, approximately 23,202 hp or 60 GWh could be saved each year by improving the system efficiency. The most important components of a hydraulic system from the point of view of energy efficiency, and therefore, the components to consider most seriously when purchasing a new hydraulic system or retrofitting an existing system, are pumps, valves and hydraulic circuit designs. 3 tabs., 2 figs.

NONE

1997-09-01

 
 
 
 
121

Plug & Play Control of Hydraulic Networks  

DEFF Research Database (Denmark)

Typically, control systems are designedwith little or no consideration for possible changes in the structure of the system process to be controlled. In classic control design, a monolithic approach is taken where structural changes in the system process require the development of a new mathematical model of the system and a subsequent redesign of the control system. This process can be expensive and time consuming. Therefore, an attractive alternative is to design the control system such that it automatically reconfigures whenever structural changes occur. This is the aim of the Plug & Play Process Control research program, which the work presented here is a part of. An industrial case study involving a large-scale hydraulic network with non-linear dynamics is studied. The hydraulic network underlies a district heating system, which provides heating water to a number of end-users in a city district. The case study considers a novel approach to the design of district heating systems in which the diameter of the pipes used in the system is reduced in order to reduce the heat losses in the system, thereby making it profitable to provide district heating to areas with low energy demands. The new structure has the additional benefit that structural changes such as the addition or removal of end-users are easily implementable. In this work, the problem of controlling the pressure drop at the end-users to a constant reference value is considered. This is done by the use of pumps located both at the end-users and at designated places across the network. The control architecture which is used consists of a set of decentralized linear control actions. The control actions use only the measurements obtained locally at each end-user. Both proportional and proportional-integral control actions are considered. Some of the work considers control actions which are constrained to non-negative values only. This is due to the fact that the actuators in this type of system typically consist of centrifugal pumps which are only able to deliver non-negative actuation. Other parts of the work consider control actions which have been quantized. That is, they are restricted to piecewise constant signals taking value in a bounded set. This is done in order to facilitate sending the control signals across a finite bandwidth communication network. This is necessary since the actuators in the system are geographically separated from the logic circuitry implementing the control actions. The results presented here consist of a series of global stability results of the closedloop system using the control actions described above. The stability analysis is complicated by the non-linearities present in the system process. Specifically, global practical output regulation can be shown when using proportional control actions, while global asymptotical output regulation can be shown when using proportional-integral control actions. Since the results are global in the state space, it is concluded that the closed-loop system maintains its stability properties when structural changes are implemented.

Jensen, Tom NØrgaard

2012-01-01

122

System Design and Performance Test of Hydraulic Intensifier  

International Nuclear Information System (INIS)

Components such as pressure vessel, hydraulic hose assembly, accumulator, hydraulic cylinder, hydraulic valve, pipe, etc., are tested under the impulse-pressure conditions prescribed in ISO and SAE standards. The impulse pressure test machine needs to have a high pressure, a precise control system and a long life. It should satisfy the requirements for fabrication of the impulse tester to generate ultra high pressure in the hydraulic system. In the impulse tester, a servo-valve control system is adopted; although the control application is convenient, it is expensive owing to the cost of developing the system. The type of the control system determines the pressure wave, which affects the components that are tested. In this study, the manufacturing process and the intensifier system design related to the flow, pressure, and the increasing rate of pressure are investigated. The results indicate the ultra high pressure waves in the system

2010-01-01

123

Crosshole investigations - Design of the hydraulic testing system  

International Nuclear Information System (INIS)

Hydraulic testing, especially using sinusoidal signals, is one component of the Crosshole Investigations at the Stripa Mine which will characterise a volume of rock located 360 metres below ground level. This paper describes the equipment which performs the hydraulic tests by creating and measuring signals in isolated sections of two boreholes. The system is computer controlled and some programming information is included

1985-01-01

124

Lockout System For Hydraulic Valves Of An Agricultural Implement  

UK PubMed Central (United Kingdom)

A farm implement has a frame that is foldable between an extended, working position and a folded, for-transport position has a hydraulic system that controls the flow of hydraulic fluid to a series of actuators that raise and lower the implement. The hydraulic system is controlled by a control lever or arm that rotates a rockshaft to open and close hydraulic valves to change the flow of hydraulic fluid to the actuators. To prevent the unintentional lowering of the implement frame when the implement is in transport, a lockout arrangement engages the rockshaft to prevent rotation of the rockshaft when the frame is in the folded position. The lockout arrangement locks out the rockshaft automatically when the frame is raised to the folded position.

YUEN CORY ADRIAN

125

LOCKOUT SYSTEM FOR HYDRAULIC VALVES OF AN AGRICULTURAL IMPLEMENT  

UK PubMed Central (United Kingdom)

A farm implement has a frame that is foldable between an extended, working position and a folded, for-transport position has a hydraulic system that controls the flow of hydraulic fluid to a series of actuators that raise and lower the implement. The hydraulic system is controlled by a control lever or arm that rotates a rockshaft to open and close hydraulic valves to change the flow of hydraulic fluid to the actuators. To prevent the unintentional lowering of the implement frame when the implement is in transport, a lockout arrangement engages the rockshaft to prevent rotation of the rockshaft when the frame is in the folded position. The lockout arrangement locks out the rockshaft automatically when the frame is raised to the folded position.

YUEN CORY

126

Hydraulic manipulator design, analysis, and control at Oak Ridge National Laboratory  

Energy Technology Data Exchange (ETDEWEB)

To meet the increased payload capacities demanded by present-day tasks, manipulator designers have turned to hydraulics as a means of actuation. Hydraulics have always been the actuator of choice when designing heavy-life construction and mining equipment such as bulldozers, backhoes, and tunneling devices. In order to successfully design, build, and deploy a new hydraulic manipulator (or subsystem) sophisticated modeling, analysis, and control experiments are usually needed. To support the development and deployment of new hydraulic manipulators Oak Ridge National Laboratory (ORNL) has outfitted a significant experimental laboratory and has developed the software capability for research into hydraulic manipulators, hydraulic actuators, hydraulic systems, modeling of hydraulic systems, and hydraulic controls. The hydraulics laboratory at ORNL has three different manipulators. First is a 6-Degree-of-Freedom (6-DoF), multi-planer, teleoperated, flexible controls test bed used for the development of waste tank clean-up manipulator controls, thermal studies, system characterization, and manipulator tracking. Finally, is a human amplifier test bed used for the development of an entire new class of teleoperated systems. To compliment the hardware in the hydraulics laboratory, ORNL has developed a hydraulics simulation capability including a custom package to model the hydraulic systems and manipulators for performance studies and control development. This paper outlines the history of hydraulic manipulator developments at ORNL, describes the hydraulics laboratory, discusses the use of the equipment within the laboratory, and presents some of the initial results from experiments and modeling associated with these hydraulic manipulators. Included are some of the results from the development of the human amplifier/de-amplifier concepts, the characterization of the thermal sensitivity of hydraulic systems, and end-point tracking accuracy studies. Experimental and analytical results are included.

Kress, R.L.; Jansen, J.F. [Oak Ridge National Lab., TN (United States). Robotics and Process Systems Div.; Love, L.J. [Oak Ridge Inst. for Science and Education, TN (United States); Basher, A.M.H. [South Carolina State Univ., Orangeburg, SC (United States)

1996-09-01

127

Hydraulic manipulator design, analysis, and control at Oak Ridge National Laboratory  

International Nuclear Information System (INIS)

To meet the increased payload capacities demanded by present-day tasks, manipulator designers have turned to hydraulics as a means of actuation. Hydraulics have always been the actuator of choice when designing heavy-life construction and mining equipment such as bulldozers, backhoes, and tunneling devices. In order to successfully design, build, and deploy a new hydraulic manipulator (or subsystem) sophisticated modeling, analysis, and control experiments are usually needed. To support the development and deployment of new hydraulic manipulators Oak Ridge National Laboratory (ORNL) has outfitted a significant experimental laboratory and has developed the software capability for research into hydraulic manipulators, hydraulic actuators, hydraulic systems, modeling of hydraulic systems, and hydraulic controls. The hydraulics laboratory at ORNL has three different manipulators. First is a 6-Degree-of-Freedom (6-DoF), multi-planer, teleoperated, flexible controls test bed used for the development of waste tank clean-up manipulator controls, thermal studies, system characterization, and manipulator tracking. Finally, is a human amplifier test bed used for the development of an entire new class of teleoperated systems. To compliment the hardware in the hydraulics laboratory, ORNL has developed a hydraulics simulation capability including a custom package to model the hydraulic systems and manipulators for performance studies and control development. This paper outlines the history of hydraulic manipulator developments at ORNL, describes the hydraulics laboratory, discusses the use of the equipment within the laboratory, and presents some of the initial results from experiments and modeling associated with these hydraulic manipulators. Included are some of the results from the development of the human amplifier/de-amplifier concepts, the characterization of the thermal sensitivity of hydraulic systems, and end-point tracking accuracy studies. Experimental and analytical results are included.

1996-01-01

128

Applied research on extension element model in hydraulic system  

Science.gov (United States)

This paper further researches the application of extension element model of hydraulic system. A extension element model of hydraulic system contains three parts: the prototype of a hydraulic component, the matter-element and relationelement model of hydraulic components, and the matter-element and relation-element model of hydraulic systems. The foundation building a extension element model of hydraulic system is to build its database of the prototypes of a hydraulic component. The matter-element and relation-element model of hydraulic components is a model for physical hydraulic components. The the matter-element and relation-element models of hydraulic components on a hydraulic system can describe the internal links among hydraulic components. Through analysis of the connections among the matter-element and relation-element models of hydraulic components, rings, power bond graphs, and dynamic equations will be found and gained. Thus, the performance and digital simulation for a hydraulic system will be realized and finished.

Tian, Junying; Wei, Bingyang; Han, Jianhai

2010-08-01

129

Pulley actuating hydraulic pressure control for continuously variable transmission  

Energy Technology Data Exchange (ETDEWEB)

A hydraulic pressure control system for a continuously variable transmission is described, comprising: a manual selector valve having a plurality of forward drive positions and being shiftable in a first direction from one or the other of two forward drive positions selected from the plurality of forward drive positions and in a second direction opposite to the first direction from the other to the one of the two forward drive positions selected; means for generating a pulley actuating hydraulic fluid pressure; means for hydraulically actuating the driver pulley and the follower pulley in response to the hydraulic fluid pressure in such a manner as to effect an upshifting in a reduction ratio between the driver and follower pulleys in response to the manual selector valve having been shifted in the first direction from the one to the other of the two forward drive positions selected; and control means for causing the hydraulic fluid pressure generating means to temporarily increase the level of the hydraulic fluid pressure whenever the manual selector valve is shifting in the first direction from the one to the other of the two forward drive positions selected.

Yamamuro, S.; Kumura, H.

1989-04-11

130

Hydraulically actuated fuel injector including a pilot operated spool valve assembly and hydraulic system using same  

Science.gov (United States)

The present invention relates to hydraulic systems including hydraulically actuated fuel injectors that have a pilot operated spool valve assembly. One class of hydraulically actuated fuel injectors includes a solenoid driven pilot valve that controls the initiation of the injection event. However, during cold start conditions, hydraulic fluid, typically engine lubricating oil, is particularly viscous and is often difficult to displace through the relatively small drain path that is defined past the pilot valve member. Because the spool valve typically responds slower than expected during cold start due to the difficulty in displacing the relatively viscous oil, accurate start of injection timing can be difficult to achieve. There also exists a greater difficulty in reaching the higher end of the cold operating speed range. Therefore, the present invention utilizes a fluid evacuation valve to aid in displacement of the relatively viscous oil during cold start conditions.

Shafer, Scott F. (Morton, IL)

2002-01-01

131

Model Reference PID Control of an Electro-hydraulic Drive  

Directory of Open Access Journals (Sweden)

Full Text Available Hydraulic cranes are inherently nonlinear and contain components exhibiting strong friction, saturation, variable inertia mechanical loads, etc. The characteristics of these non-linear components are usually not known exactly as structure or parameters. For these reasons, tuning of the traditional PID controller parameters to control this system for the required performance faces a strong challenge. In this paper a new approach to design an adaptive PID control has the ability to solve the control problem of highly nonlinear systems such as the hydraulic crane was proposed. The core of the design method depends on comparing the performance of the Model Reference (MR) response with the nonlinear model response and feeding an adaptation signal to the PID control system to eliminate the error in between. It is found that the proposed MR-PID control policy provided the most consistent performance in terms of rise time and settling time regardless of the nonlinearities.

Ayman A. Aly

2012-01-01

132

Fire Resistant Aircraft Hydraulic System.  

Science.gov (United States)

This document reports a study to select a nonflammable hydraulic fluid for possible use in future military aircraft in which the Halocarbon Products Corporation AO-8 chlorotrifluoroethylene (CTFE) fluid was selected as the most promising fluid which meets...

E. T. Raymond D. W. Huling R. L. Shick E. C. Wagner W. E. Willard

1982-01-01

133

Hydraulic system for a motor vehicle. Hydraulikanlage fuer ein Kraftfahrzeug  

Energy Technology Data Exchange (ETDEWEB)

The hydraulic system for a motor vehicle has a constant pump for the supply of the steering equipment; it also has at least one powercontrolled adjusting pump, which supplies at least one speed-controlled hydraulic motor and several working cylinders. For control of the consumers, electromagnetic distributing valves which are accessed by an electronic control device according to specific regularities are provided; they ensure optimal supply of the consumers. Another pressure storage is connected to the supply line to the working cylinders. The system has a pressure sensor which monitors the pressure; it is connected with an electronic control device and contributes also to the control of the directional valves.

Waigle, D.; Altmann, U.; Hesse, H.

1991-07-25

134

Hydraulic pressure control apparatus for use in automatic transmission  

Energy Technology Data Exchange (ETDEWEB)

This patent describes a hydraulic pressure control apparatus for use in an automatic transmission, comprising: a first throttle valve for producing a first throttle pressure which increases in response to a first control force applied thereto in relation with intake throttle position. The first throttle pressure being for boosting a line pressure according to the intake throttle position; a second throttle valve for producing a second throttle pressure which increases in response to a second control force applied thereto in relation with the intake throttle position, the second throttle pressure being for shifting transmission speed stages; a first hydraulic system for supplying the first throttle pressure to the first throttle valve so as to lower the first throttle pressure to be produced thereby; a second hydraulic system for supplying the first throttle pressure to the first throttle valve for producing a first auxiliary force in the first throttle valve. The first auxiliary force being added to the first control force so as to operate in the same direction therewith; a third hydraulic system for supplying the second throttle pressure to the second throttle valve so as to lower the second throttle pressure to be produced thereby.

Taga, Y.; Morisawa, K.

1988-11-29

135

Power Management in Mobile Hydraulic Applications - An Approach for Designing Hydraulic Power Supply Systems  

DEFF Research Database (Denmark)

Throughout the last three decades energy consumption has become one of the primary design aspects in hydraulic systems, especially for mobile hydraulic systems, as power and cooling capacity here is at limited disposal. Considering the energy usage, this is dependent on component efficiency, but even more important is the system topology. However, there are no rules or guidelines for what system topology to choose for a given application, in order to obtain the most energy efficient system, nor for how the energy should be distributed in the system. This paper describes the approach taken in a project to develop rules and methods for designing and controlling mobile hydraulic systems in the most energy efficient way, when also considering the operational aspects of the system. The paper first describes the thoughts and ideas behind the project and then focus on an automated approach to design the hydraulic power supply in the most energy efficient way, when considering a number of load situations. Finally an example of the approach is shown to prove its validity.}

Pedersen, Henrik Clemmensen

2004-01-01

136

MODULAR PLANTER HYDRAULIC SYSTEM AND METHOD  

UK PubMed Central (United Kingdom)

An apparatus and manufacturing method in which from one to three hydraul ic pumps are provided and installed near a front end of the implement, so that a first pump can be easily coupled to the power take-off shaft of the tractor by an operator. In an exemplary embodiment of a system for a planter apparatus, one pump supplies pressure and flow to a hydraulic circuit for operating the vacuum fan subsystem, and optionally a fertilizing subsystem. A second pump supplies pressure and flow to a hydraulic circuit for operating the seed drive subsystem. A third pump supplies pressure and flow to a hydraulic circuit for operating a bulk fill subsystem . A manufacturing method that provides multiple configurations is also disclosed .

HARNETIAUX TRAVIS LESTER; BETTIN LEONARD A

137

Modular planter hydraulic system and method  

UK PubMed Central (United Kingdom)

An apparatus and manufacturing method in which from one to three hydraulic pumps are provided and installed near a front end of the implement, so that a first pump can be easily coupled to the power take-off shaft of the tractor by an operator. In an exemplary embodiment of a system for a planter apparatus, one pump supplies pressure and flow to a hydraulic circuit for operating the vacuum fan subsystem, and optionally a fertilizing subsystem. A second pump supplies pressure and flow to a hydraulic circuit for operating the seed drive subsystem. A third pump supplies pressure and flow to a hydraulic circuit for operating a bulk fill subsystem. A manufacturing method that provides multiple configurations is also disclosed.

BETTIN LEONARD A; HARNETIAUX TRAVIS L; HARNETIAUX TRAVIS LESTER

138

Linear Perturbation Adaptive Control of Hydraulically Driven Manipulators  

DEFF Research Database (Denmark)

A method for synthesis of a robust adaptive scheme for a hydraulically driven manipulator, that takes full advantage of any known system dynamics to simplify the adaptive control problem for the unknown portion of the dynamics is presented. The control method is based on adaptive perturbation control.Using the Lyapunov approach, under slowly time-varying assumptions, it is shown that the tracking error and the parameter error remain bounded. This bound is a function of the ideal parameters and a bounded disturbance. The control algorithm decouples and linearizes the manipulator so that each joint behaves as an independent second-order system with fixed dynamics.

Andersen, T.O.; Hansen, M.R.

2004-01-01

139

A coupled analysis of system thermal-hydraulics and three-dimensional reactor kinetics for a 12-finger control element assembly drop event in a PWR plant  

International Nuclear Information System (INIS)

A coupled system thermal-hydraulics (T-H) and three-dimensional reactor kinetics code, MARS/MASTER, was developed to attain more accurate predictions for nuclear system transients that involve strong interactions between neutronic and T-H phenomena. In this paper, a 12-finger control element assembly (CEA) drop event in a two-loop pressurized water reactor (PWR) plant under a full power condition was analyzed, where the 12-finger CEA that is nearest to the hot leg of Loop 2 is assumed to incidentally drop. This instantaneously results in an asymmetric radial power distribution and, in turn, asymmetric loop behavior, which may lead to a reactor trip due to a low departure from nucleate boiling (DNB) ratio at the intact side of the core or an excessive difference between the cold leg coolant temperatures. This event clearly requires a coupled calculation of system T-H and three-dimensional reactor kinetics to realistically investigate the thermal-hydraulic behavior of the reactor core. A simple theoretical modeling is also devised to evaluate the cold leg temperature difference under a quasi-steady state.

2010-01-01

140

Design of a hydraulic ash transport system  

Energy Technology Data Exchange (ETDEWEB)

Discusses general design of a hydraulic ash removal system to be employed at the reconstructed six 225 MW blocks of the Mironov State Regional Power Plant in the USSR. The blocks burn low-grade solid fuel with an ash content of up to 40.5%. Large quantities of ash have to be moved from the plant (total ash production 60 t/h, using 570 t/h of water for cooling and moistening). An optimum hydraulic ash transportation system would include a two-section airlift pumping system, shown in a diagram. Technological advantages of using this airlift system are enumerated, including short pipes, reduction in required water quantity and the possibility of siting hydraulic pumps at zero level.

Mirgorodskii, V.G.; Mova, M.E.; Korenev, V.E.; Grechikhin, Yu.A. (Donetskii Politekhnicheskii Institut (USSR))

1990-04-01

 
 
 
 
141

Wireline hydraulic isolation packer system  

Energy Technology Data Exchange (ETDEWEB)

This patent describes an apparatus for installing a tubing patch in a tubing string to seal against a leak of fluids between the interior of the tubing string and the tubing annulus. It comprises: an assembly insertable as a unit into the tubing string unitary assembly defining a passage therethrough having an upper packer to form a seal against the interior of the tubing string above the leak and a lower packer to form a seal against the interior of the tubing string below the leak, a tailpipe connecting the upper and lower packers, and upper and lower packers being set sequentially, each packer being set without use of a drilling of workover rig to facilitate use in offshore environments. This paper describes a method for installing a tubing patch in a tubing string to seal against leakage of fluid between the interior of the tubing string and the tubing annulus. It comprises the steps of: positioning an integral assembly having an upper packer set by a wireline tool and a lower packer set by hydraulic pressure within the interior of the tubing string within the tubing proximate the leak; setting the upper packer with the wireline tool to form a seal against the interior of the tubing string above the leak; and subsequently setting the lower packer with hydraulic pressure within the interior of the tubing string independently of the setting of the upper packer to form a seal against the interior of the tubing string below the leak to thus isolate the leak.

Buckner, R.K.; Read, N.W.; Ritchie, D.E.

1989-08-01

142

Stomatal control and hydraulic conductance, with special reference to tall trees.  

Science.gov (United States)

A better understanding of the mechanistic basis of stomatal control is necessary to understand why modes of stomatal response differ among individual trees, and to improve the theoretical foundation for predictive models and manipulative experiments. Current understanding of the mechanistic basis of stomatal control is reviewed here and discussed in relation to the plant hydraulic system. Analysis focused on: (1) the relative role of hydraulic conductance in the vicinity of the stomatal apparatus versus whole-plant hydraulic conductance; (2) the influence of guard cell inflation characteristics and the mechanical interaction between guard cells and epidermal cells; and (3) the system requirements for moderate versus dramatic reductions in stomatal conductance with increasing evaporation potential. Special consideration was given to the potential effect of changes in hydraulic properties as trees grow taller. Stomatal control of leaf gas exchange is coupled to the entire plant hydraulic system and the basis of this coupling is the interdependence of guard cell water potential and transpiration rate. This hydraulic feedback loop is always present, but its dynamic properties may be altered by growth or cavitation-induced changes in hydraulic conductance, and may vary with genetically related differences in hydraulic conductances. Mechanistic models should include this feedback loop. Plants vary in their ability to control transpiration rate sufficiently to maintain constant leaf water potential. Limited control may be achieved through the hydraulic feedback loop alone, but for tighter control, an additional element linking transpiration rate to guard cell osmotic pressure may be needed. PMID:15172837

Franks, Peter J

2004-08-01

143

Some aspects of the design of hydraulic system for hydraulically operated truck crane  

Energy Technology Data Exchange (ETDEWEB)

The truck crane/lorry loader is a self-propelled boom crane to move light loads both vertically and horizontally. Operator ease and comfort is always an important factor for improved productivity and efficiency and may be obtained to a great extent by incorporation of hydraulic system. Manufacturers and users of the truck crane are, therefore, presently inclined towards the hydraulically operated one. In this paper, the principle of hydraulic system/circuit design required for hydraulically operated truck crane is discussed.

Biswas, D.K. (National Metallurgical Lab., Jamshedpur (India))

1990-01-01

144

Controlling a negative loaded hydraulic cylinder using pressure feedback  

DEFF Research Database (Denmark)

This paper is concerned with the inherent oscillatory nature of pressure compensated velocity control of a hydraulic cylinder subjected to a negative load and suspended by means of an over-center valve. Initially, a linearized stability analysis of such a hydraulic circuit is carried out clearly showing that without extra measures such a system will be unstable in a substantial part of the cylinder stroke. The stability criterion is expressed in hard quantities: Cylinder volumes, cylinder area ratio and overcenter valve pilot area ratio. A pressure feed back scheme that has as target to maintain the high pass filtered pressure gradient equal tozero is introduced. It yields lead compensation with a markedly improved performance. The sizing of the filter is described taking into account the bandwidth of the directional control valve. The suggested control scheme is implemented and examined in a nonlinear time domain simulation model validating the linear stability analysis.

Hansen, M.R.; Andersen, T.O.

2010-01-01

145

Thermal Equilibrium of a Hydraulic Driving System  

Directory of Open Access Journals (Sweden)

Full Text Available To put into evidence the consequence of the energetic losses that appears in a hydraulic driving systems and to evaluate how does the system performance and reliability are strongly affected by the temperature increase due-to the flowing fluid, in this study a thermal analysis is presented for improving the possibility of developing a practical and simplified method for establishing the optimum working temperature at any instant time. Focus is on computational methods that to be used for controlling the working temperature around the limit of admissible temperature, if the working temperature exceeds this limit, the fluid properties alteration will occur rapidly and a slow deterioration in the internal working parts of the system is expected, based on the failure rule rate that doubles for every 10?C of a temperature increase. Heat load duration is evaluated for both short and long operation periods, in which thermal equations are introduced to describe the conduction, convection and radiation modes of the heat transfer for the given mode of operation .The main conclusion of this study draws an important attention, that must be taken into account even during the first stages of designing such systems, in order to establish the optimum dimensions for the heat exchanger solution, as a design option when required for reducing the heat load for satisfying the needed working temperature and then keeping the system within the energy balance condition

Tarawneh S. Muafag; Faisal M.M. Al-Gathian

2004-01-01

146

Evolution of hydraulic system for moving components on Tore Supra  

Energy Technology Data Exchange (ETDEWEB)

Specific diagnostics as Langmuir probe measurement and RF heating systems require fast and accurate displacement of components. This is provided by an active hydraulic system that has been working since 1988 with a high reliability on Tore Supra. At the present time, two LHCD launchers, three ICRH antennae and two fast moving probes are actively moved. Later, for the Tore Supra next step CIEL project (Composants Internes Et Limiteurs) that is planned for the year 2000, the Toroidal Pump Limiter (TPL) positioning and the fast shutters pumping duct will also be actively controlled. This paper describes the design of the present day Tore Supra hydraulic system and the new original hydraulic systems required for the Toroidal Pump Limiter. (author)

Samaille, F.; Journeaux, J.Y.; Doceul, L.; Giraud, G.; Pasquier, G. [Association Euratom-CEA Cadarache, 13 - Saint-Paul-lez-Durance (France). Dept. de Recherches sur la Fusion Controlee

1998-07-01

147

Evolution of hydraulic system for moving components on Tore Supra  

International Nuclear Information System (INIS)

Specific diagnostics as Langmuir probe measurement and RF heating systems require fast and accurate displacement of components. This is provided by an active hydraulic system that has been working since 1988 with a high reliability on Tore Supra. At the present time, two LHCD launchers, three ICRH antennae and two fast moving probes are actively moved. Later, for the Tore Supra next step CIEL project (Composants Internes Et Limiteurs) that is planned for the year 2000, the Toroidal Pump Limiter (TPL) positioning and the fast shutters pumping duct will also be actively controlled. This paper describes the design of the present day Tore Supra hydraulic system and the new original hydraulic systems required for the Toroidal Pump Limiter. (author)

1998-01-01

148

Efficient hydraulic properties of root systems  

Science.gov (United States)

Understanding the mechanisms of ecosystem root water uptake (RWU) is paramount for parameterizing hydrological models. With the increase in computational power it is possible to calculate RWU explicitly up to the single plant scale using physical models. However, application of these models for increasing our understanding of ecosystem root water uptake is hindered by the deficit in knowledge about the detailed hydraulic parameter distribution within root systems. However, those physical models may help us to identify efficient parameterizations and to describe the influence of these hydraulic parameters on RWU profiles. In this research, we investigated the combined influence of root hydraulic parameters and different root topologies on shaping efficient root water uptake. First, we use a conceptual model of simple branching structures to understand the influence of branching location and transitions in root hydraulic properties on the RWU patterns in typical sub root structures. Second, we apply a physical model called "aRoot" to test our conclusions on complex root system architectures of single plants. aRoot calculates the distribution of xylem potential within arbitrary root geometries to satisfy a given water demand depending on the available water in the soil. Redistribution of water within the bulk soil is calculated using the Richards equation. We analyzed results using a measure of uptake efficiency, which describes the effort necessary for transpiration. Simulations with the conceptual model showed that total transpiration in sub root structures is independent of root hydraulic properties over a wide range of hydraulic parameters. On the other hand efficiency of root water uptake depends crucially on distribution hydraulic parameters in line with root topology. At the same time, these parameters shape strongly the distribution of RWU along the roots, and its evolution in time, thus leading to variable individual root water uptake profiles. Calculating RWU of three dimensional root architectures unveiled that the same effects can be observed at the single plant scale. Total transpiration is almost independent of root hydraulic properties. On the other hand, the arrangement of hydraulic properties significantly influences RWU efficiency. Furthermore the vertical root water uptake profiles are governed by the different root properties. They result from two combined re-distribution patterns over time: One within a rooting branch similar to the results mentioned above, and a second one between the different rooting branches within the root system. This leads to complex vertical uptake profiles, which cannot be predicted from a combination of root abundance and soil moisture, and depend strongly on the individual morphology.

Bechmann, Marcel; Schneider, Christoph; Carminati, Andrea; Hildebrandt, Anke

2013-04-01

149

Breaker system for hydraulic fracturing fluids  

Energy Technology Data Exchange (ETDEWEB)

Aqueous compositions are described which have properties making them suitable for use as hydraulic fracturing fluids. These compositions comprise (1) an uncrosslinked aqueous polysaccharide solution, and (2) a 4,4'-thiodiphenol. Ingredient (2) acts as a breaker and causes the composition to lose viscosity at a controlled rate. 10 claims.

Kucera, C.H.; Connell, R.B.

1983-05-03

150

A new generation drilling rig: hydraulically powered and computer controlled  

Energy Technology Data Exchange (ETDEWEB)

Development, testing and operation of a new generation of hydraulically powered and computer controlled drilling rig that incorporates a number of features that enhance functionality and productivity, is described. The rig features modular construction, a large heated common drilling machinery room, permanently-mounted draw works which, along with the permanently installed top drive, significantly reduces rig-up/rig-down time. Also featured are closed and open hydraulic systems and a unique hydraulic distribution manifold. All functions are controlled through a programmable logic controller (PLC), providing almost unlimited interlocks and calculations to increase rig safety and efficiency. Simplified diagnostic routines, remote monitoring and troubleshooting are also part of the system. To date, two rigs are in operation. Performance of both rigs has been rated as `very good`. Little or no operational problems have been experienced; downtime has averaged 0.61 per cent since August 1998 when the the first of the two rigs went into operation. The most important future application for this rig is for use with the casing drilling process which eliminates the need for drill pipe and tripping. It also reduces the drilling time lost due to unscheduled events such as reaming, fishing and taking kicks while tripping. 1 tab., 6 figs.

Laurent, M.; Angman, P.; Oveson, D. [Tesco Corp., Calgary, AB, (Canada)

1999-11-01

151

Control rod drive system hydraulic transient analytical and transient test results for James A. FitzPatrick BWR plant  

International Nuclear Information System (INIS)

On October 14, 1981, Reactor Control, Inc., the supplier of the Control Rod Drive (CRD) System, informed the NRC that the rapid opening of insert scram valves could potentially result in a significant waterhammer transient affecting the CRD insert lines and supports in several BWR plants. As a result, all BWR plants are addressing this issue by performing analyses and tests to determine the effect of waterhammer loads on the CRD system during a scram event. The FitzPatrick plant has been operating for approximately 10 years and has experienced a sizeable number of scram events with no apparent effect on the CRD system piping and supports. This is indicative that the CRD system is capable of withstanding the waterhammer loads. The objective of this project was to upgrade the system, if needed, but to avoid expenditure of resources and manrem exposure on modifications that would not yield a gain in safety. This objective was accomplished by a combination of computer analyses and in-plant tests to realistically predict the system structure behavior under waterhammer loads. This approach would indicate that the system is adequately designed or would identify the modification needed. (orig.).

1987-01-01

152

Lightweight Hydraulic System Hardware Endurance Test.  

Science.gov (United States)

A 100 hour endurance test was conducted at 8000 psi and +200F on lightweight hardware in a laboratory hydraulic system designed to be representative of aircraft-type circuitry. The hardware cycled were: pump, relief valve, restrictors, solenoid valves, fl...

J. N. Demarchi R. K. Haning

1975-01-01

153

Reactor Shutdown Mechanism by Top-mounted Hydraulic System  

Energy Technology Data Exchange (ETDEWEB)

There are two types of reactor shutdown mechanisms in HANARO. One is the mechanism driven by a hydraulic system, and the other is driven by a stepping motor. In HANARO, there are four Control Rod Drive Mechanisms (CRDMs) with an individual step motor and four Shutoff (SO) Units with an individual hydraulic system located at the top of reactor pool. The absorber rods in SO units are poised at the top of the core by the hydraulic force during normal operation. The rods of SO units drop by gravity as the first reactor showdown mechanism when a trip is commended by the reactor protection system (RPS). The rods in CRDMs also drop by gravity together as a redundant shutdown mechanism. When a trip is commended by the reactor regulating system (RRS), the absorber rods of CRDM only drop; while the absorber rods of SO units stay at the top of the core by the hydraulic system. The reactivity control mechanisms of in JRTR, one of the new research reactor with plate type fuels, consist of four CRDMs driven by an individual step motor and two second shutdown drive mechanisms (SSDMs) driven by an individual hydraulic system as shown in Fig. 1. The CRDMs act as the first reactor shutdown mechanism and reactor regulating as well. The top-mounted SSDM driven by the hydraulic system for the JRTR is under design in KAERI. The SSDM provides an alternate and independent means of reactor shutdown. The second shutdown rods (SSRs) of the SSDM are poised at the top of the core by the hydraulic system during the normal operation and drop by gravity for the reactor trip. Based on the proven technology of the design, operation and maintenance for HANARO, the SSDM for the JRTR has been optimized by the design improvement from the experience and test. This paper aims for the introduction of the SSDM in the process of the basic design. The major differences of the shutdown mechanisms by the hydraulic system are compared between HANARO and JRTR, and the design features, system, structure and future works are also described

Kim, Sang Haun; Cho, Yeong Garp; Choi, Myoung Hwan; Lee, Jin Haeng; Huh, Hyung; Kim, Jong In [Korea Atomic Energy Research Institute, Daejeon (Korea, Republic of)

2012-05-15

154

Reactor Shutdown Mechanism by Top-mounted Hydraulic System  

International Nuclear Information System (INIS)

There are two types of reactor shutdown mechanisms in HANARO. One is the mechanism driven by a hydraulic system, and the other is driven by a stepping motor. In HANARO, there are four Control Rod Drive Mechanisms (CRDMs) with an individual step motor and four Shutoff (SO) Units with an individual hydraulic system located at the top of reactor pool. The absorber rods in SO units are poised at the top of the core by the hydraulic force during normal operation. The rods of SO units drop by gravity as the first reactor showdown mechanism when a trip is commended by the reactor protection system (RPS). The rods in CRDMs also drop by gravity together as a redundant shutdown mechanism. When a trip is commended by the reactor regulating system (RRS), the absorber rods of CRDM only drop; while the absorber rods of SO units stay at the top of the core by the hydraulic system. The reactivity control mechanisms of in JRTR, one of the new research reactor with plate type fuels, consist of four CRDMs driven by an individual step motor and two second shutdown drive mechanisms (SSDMs) driven by an individual hydraulic system as shown in Fig. 1. The CRDMs act as the first reactor shutdown mechanism and reactor regulating as well. The top-mounted SSDM driven by the hydraulic system for the JRTR is under design in KAERI. The SSDM provides an alternate and independent means of reactor shutdown. The second shutdown rods (SSRs) of the SSDM are poised at the top of the core by the hydraulic system during the normal operation and drop by gravity for the reactor trip. Based on the proven technology of the design, operation and maintenance for HANARO, the SSDM for the JRTR has been optimized by the design improvement from the experience and test. This paper aims for the introduction of the SSDM in the process of the basic design. The major differences of the shutdown mechanisms by the hydraulic system are compared between HANARO and JRTR, and the design features, system, structure and future works are also described

2012-01-01

155

Vehicle hydraulic system that provides heat for passenger compartment  

Energy Technology Data Exchange (ETDEWEB)

A vehicle includes a vehicle housing which defines a passenger compartment. Attached to the vehicle housing is a hydraulic system, that includes a hydraulic fluid which flows through at least one passageway within the hydraulic system. Also attached to the vehicle housing is a passenger compartment heating system. The passenger compartment heating system includes a heat exchanger, wherein a portion of the heat exchanger is a segment of the at least one passageway of the hydraulic system.

Bartley, Bradley E. (Manito, IL); Blass, James R. (Bloomington, IL); Gibson, Dennis H. (Chillicothe, IL)

2001-01-01

156

Cut costs and downtime by maintaining hydraulic systems  

Energy Technology Data Exchange (ETDEWEB)

The author discusses how preventive and predictive maintenance of hydraulic power systems can increase production. They say contamination can lead to three types of hydraulic system failure: catastrophic, intermittent, and degradation. The individual parts of a hydraulic system just be examined to determine the malfunction of the system as a whole. Good maintenance procedures will cut back on repairs and downtime. The author then discusses what to look for when examining the pumps, valves, oil, cylinders, filters, and hoses of hydraulic systems.

Morris, S.D.

1987-11-01

157

Design of a pictogram of the operator-hydraulic filler system  

Energy Technology Data Exchange (ETDEWEB)

A modern hydraulic filling system is discussed which consists of two lines: the crusher and sorter preparing the filling material, and the hydraulic filling unit, which includes a mixer and a system of pulp conduits. The process chart of the hydraulic filling system without the crusher-sorter is illustrated. When the system is started, water is first flushed through the pulp conduit, gate valves with drives are opened, and the quantity of water discharged is measured by water output sensors. For effective and failure-free operation of the system, remote control and monitoring elements are introduced into the hydraulic filling system.

Bukhgol' ts, V.P.; Dinershtein, V.A.

1985-09-01

158

Control of flexible robots with prismatic joints and hydraulic drives  

International Nuclear Information System (INIS)

The design and control of long-reach, flexible manipulators has been an active research topic for over 20 years. Most of the research to date has focused on single link, fixed length, single plane of vibration test beds. In addition, actuation has been predominantly based upon electromagnetic motors. Ironically, these elements are rarely found in the existing industrial long-reach systems. One example is the Modified Light Duty Utility Arm (MLDUA) designed and built by Spar Aerospace for Oak Ridge National Laboratory (ORNL). This arm operates in larger, underground waste storage tanks located at ORNL. The size and nature of the tanks require that the robot have a reach of approximately 15 ft and a payload capacity of 250 lb. In order to achieve these criteria, each joint is hydraulically actuated. Furthermore, the robot has a prismatic degree-of-freedom to ease deployment. When fully extended, the robot's first natural frequency is 1.76 Hz. Many of the projected tasks, coupled with the robot's flexibility, present an interesting problem. How will many of the existing flexure control algorithms perform on a hydraulic, long-reach manipulator with prismatic links? To minimize cost and risk of testing these algorithms on the MLDUA, the authors have designed a new test bed that contains many of the same elements. This manuscript described a new hydraulically actuated, long-reach manipulator with a flexible prismatic link at ORNL. Focus is directed toward both modeling and control of hydraulic actuators as well as flexible links that have variable natural frequencies.

1997-05-01

159

Hydraulic characteristics in top entry system  

International Nuclear Information System (INIS)

The top entry system is an advanced type of system from the conventional loop type LMFBR, which constitutes the primary reactor cooling loops by installing inverted U-shaped pipes between the reactor vessel (R/V), intermediate heat exchanger (IHX) and primary pumps. Therefore, thermal hydraulic tests paying attention to the thermal stratification phenomena (water test and sodium test) were conducted by using scale models of the system to obtain the thermal transient conditions, thermal head relating to natural circulation and knowledge about the effect of the difference in the physical properties between water and sodium. The following results were obtained: (1) It is estimated that there is no problem with thermal hydraulics in the Top Entry System. Thermal stratification at the inverted U-shaped pipes would not occur under the actual plant conditions. (2) Thermal hydraulic characteristics under the decay heat removal conditions by natural circulation of coolant were obtained. These results confirmed the feasibility of the top entry system. (author).

1994-01-01

160

D2O system and oil hydraulic system of fuelling machine  

International Nuclear Information System (INIS)

Two of the most important supporting systems in CANDU fuel handling system--D2O supply and control system and oil hydraulic system are described, focusing on design requirements, major function, system structure and the main work flow of the two systems individually so as to briefly and concisely present the two typical CANDU systems

2001-01-01

 
 
 
 
161

Common cause failure analysis of hydraulic scram and control rod systems in the Swedish and Finnish BWR plants  

Energy Technology Data Exchange (ETDEWEB)

The main task of the project included the analysis of the operating experiences at the BWRs of ABB Atom design, comprising 9 units in Sweden and 2 in Finland. International experience and reference information were also surveyed. A reference application was done for the Barsebaeck plant. This pilot study covered all systems which contribute to the reactor shutdown, including also the actuation relays at the interface to the reactor protection system. The Common Load Model was used as the quantification method, which proved to be a practicable approach. This method provides a consistent handling of failure combinatorics and workable extension to evaluate localized dependence between adjacent control rod and drive assemblies (CRDAs). As part of this project, instructions of handbook style were prepared for the CCF analysis of high redundancy systems. The primary focus in the analysis of operating experience was placed on the scram valves and CRDAs. Due to the limited component population, the experiences for the scram valve constitute only a few single failures and some potential but none actual CCF event. These insights are compatible with the generic data for these valves. The experiences for the CRDAs include several single failures, and some actual and many potential CCF events of varying degree of functional impact. Special emphasis was placed to identify any multiple failure or degradation indicating that adjacent rods would be more vulnerable to failure, because such phenomena are far more critical for the scram function as compared to failure of randomly placed rods. 17 refs.

Mankamo, T. [Avaplan Oy, Espoo (Finland)

1996-12-01

162

Common cause failure analysis of hydraulic scram and control rod systems in the Swedish and Finnish BWR plants  

International Nuclear Information System (INIS)

The main task of the project included the analysis of the operating experiences at the BWRs of ABB Atom design, comprising 9 units in Sweden and 2 in Finland. International experience and reference information were also surveyed. A reference application was done for the Barsebaeck plant. This pilot study covered all systems which contribute to the reactor shutdown, including also the actuation relays at the interface to the reactor protection system. The Common Load Model was used as the quantification method, which proved to be a practicable approach. This method provides a consistent handling of failure combinatorics and workable extension to evaluate localized dependence between adjacent control rod and drive assemblies (CRDAs). As part of this project, instructions of handbook style were prepared for the CCF analysis of high redundancy systems. The primary focus in the analysis of operating experience was placed on the scram valves and CRDAs. Due to the limited component population, the experiences for the scram valve constitute only a few single failures and some potential but none actual CCF event. These insights are compatible with the generic data for these valves. The experiences for the CRDAs include several single failures, and some actual and many potential CCF events of varying degree of functional impact. Special emphasis was placed to identify any multiple failure or degradation indicating that adjacent rods would be more vulnerable to failure, because such phenomena are far more critical for the scram function as compared to failure of randomly placed rods. 17 refs.

1996-01-01

163

Control rod driving hydraulic pressure device  

Energy Technology Data Exchange (ETDEWEB)

The present invention concerns a control rod driving hydraulic device of a BWR type reactor, and provides an improvement for a means for supplying mechanical seal flashing water of a pump. That is, a mechanical seal flashing pipeline is branched at the downstream of a pressure-reducing orifice and connected to a minimum flow pipeline. With such a constitution, the minimum flow pipeline is connected to a minimum flow pipeline of an auxiliary pump at the downstream of the pressure-reducing orifice and returned to a suction pipeline of the pump. Pressure at the downstream of the pressure-reducing orifice is set, in the orifice, to a pressure required for mechanical seal flashing. Accordingly, the mechanical seal flashing pipeline is connected and a part of minimum flow rate is utilized, thereby enabling to cool mechanical seals. As a result, flow rate of the mechanical flashing water which has been flown out can be saved. The exhaustion amount from the pump can be reduced, to decrease the shaft power and reduce the capacity of the motor. (I.S.).

Ogawa, Masahide.

1993-02-05

164

Control rod driving hydraulic pressure device  

International Nuclear Information System (INIS)

The present invention concerns a control rod driving hydraulic device of a BWR type reactor, and provides an improvement for a means for supplying mechanical seal flashing water of a pump. That is, a mechanical seal flashing pipeline is branched at the downstream of a pressure-reducing orifice and connected to a minimum flow pipeline. With such a constitution, the minimum flow pipeline is connected to a minimum flow pipeline of an auxiliary pump at the downstream of the pressure-reducing orifice and returned to a suction pipeline of the pump. Pressure at the downstream of the pressure-reducing orifice is set, in the orifice, to a pressure required for mechanical seal flashing. Accordingly, the mechanical seal flashing pipeline is connected and a part of minimum flow rate is utilized, thereby enabling to cool mechanical seals. As a result, flow rate of the mechanical flashing water which has been flown out can be saved. The exhaustion amount from the pump can be reduced, to decrease the shaft power and reduce the capacity of the motor. (I.S.)

1991-07-23

165

Hydraulic press with LS system for modelling of plastic working operations  

International Nuclear Information System (INIS)

At first, the paper describes destination of the presented hydraulic press. Next, the substance of load sensing (LS) systems operation was introduced, and electro-hydraulic system of this type, installed in laboratory hydraulic press, was described. The control and measurement circuit of the device was also described, and exemplary test results obtained during plastic working operations on soft non-ferrous alloys were presented. (authors)

2008-01-01

166

Hydraulic Press with LS System for Modelling of Plastic Working Operations  

Directory of Open Access Journals (Sweden)

Full Text Available At first, the paper describes destination of the presented hydraulic press. Next, the substance of load sensing (LS) systems’ operation was introduced, and electro-hydraulic system of this type, installed in laboratory hydraulic press, was described. The control and measurement circuit of the device was also described, and exemplary test results obtained during plastic working operations on soft non-ferrous alloys were presented.

Janusz Pluta

2008-01-01

167

Hydraulic system for a ratio change transmission  

Energy Technology Data Exchange (ETDEWEB)

Disclosed is a drive assembly (10) for an electrically powered vehicle (12). The assembly includes a transaxle (16) having a two-speed transmission (40) and a drive axle differential (46) disposed in a unitary housing assembly (38), an oil-cooled prime mover or electric motor (14) for driving the transmission input shaft (42), an adapter assembly (24) for supporting the prime mover on the transaxle housing assembly, and a hydraulic system (172) providing pressurized oil flow for cooling and lubricating the electric motor and transaxle and for operating a clutch (84) and a brake (86) in the transmission to shift between the two-speed ratios of the transmission. The adapter assembly allows the prime mover to be supported in several positions on the transaxle housing. The brake is spring-applied and locks the transmission in its low-speed ratio should the hydraulic system fail. The hydraulic system pump is driven by an electric motor (212) independent of the prime mover and transaxle.

Kalns, Ilmars (Northville, MI)

1981-01-01

168

A hydraulic transient analysis tool for power plant piping systems  

International Nuclear Information System (INIS)

[en] A hydraulic transient computer simulation procedure is presented which is capable of simulating the waterhammer response of power plant liquid piping systems under a variety of forcing functions. The procedure, which models most current pipeline hardware, is suitable for simulating events such as valve operation, pump start-up and shutdown, and the dynamic action of PID controllers. Application of the procedure in an actual analysis of a condensate polisher and feedwater system is discussed

1989-01-01

169

Hydraulic system for powered supports - basic approach to system design  

Energy Technology Data Exchange (ETDEWEB)

The factors to be taken into account during the design of a hydraulic system for powered supports are discussed. These include: mean flow rate (volume of fluid required for one support for one sequence of operation); pump capacity; loss of pressure in the transmission hoses beyond the pump value; hose dimensions; tank capacity; pressure drop analysis for the support system; hydraulic circuits for the support system. Sample calculations are presented for obtaining these parameters. 1 reference.

Bhattacharjee, T.K.

1985-11-01

170

A study on hydraulic fore pole system  

Energy Technology Data Exchange (ETDEWEB)

This system is designed to improve the safety and speed when heading friable coal seams by pushing the fore poles into the face using hydraulic power. This study started last year with fore poles made of steel, so-called `Messer Plate` and a hydraulic cylinder. However, the last year`s test showed the following problems. (1) It was time-consuming to install the fore poles onto the steel arch sets and withdraw them. (2) Steel arches set at irregular intervals acted as an obstacle to the operation of the hydraulic cylinder. (3) The front arch was apt to tilt forward due to the friction between the fore pole and girder. To solve the above mentioned problems, the fore pole and working methods were changed in this year`s study. The fore poles were made of wooden plank 1.8 m long, 20 cm wide and 3 cm thick with a line of holes at center. Instead of installing them onto the steel girder, they were inserted through two steel hanging devices fastened to the girders. Solving the problems, this system would be settled down as one of the safe and fast ways to tunnel through friable coal seams. (author). 25 refs., tabs., figs.

Kim, Y.S.; Lee, K.W.; Kang, S.S.; Kim, D.K. [Korea Institute Geology Mining and Materials, Taejon (Korea, Republic of)

1994-12-01

171

Simulation of Dynamics of System with Hydraulic Lines and Linear Hydraulic Motor with Mass Load  

Directory of Open Access Journals (Sweden)

Full Text Available This paper deals with the numerical simulation of dynamic properties of the system consisting of hydraulic lines and linear hydraulic motor with a mass load. The mathematical model is created using Matlab SimHydraulics software. Oil bulk modulus, elasticity and volumes of pipes and hoses play a significant role in this case. Mathematical models are verified on experimental equipment. Pressure and position responses during sudden stop of a moving cylinder are measured on this equipment.

Bure?ek A.; Hružík L.; Vašina M.

2013-01-01

172

Simulation of Dynamics of System with Hydraulic Lines and Linear Hydraulic Motor with Mass Load  

Science.gov (United States)

This paper deals with the numerical simulation of dynamic properties of the system consisting of hydraulic lines and linear hydraulic motor with a mass load. The mathematical model is created using Matlab SimHydraulics software. Oil bulk modulus, elasticity and volumes of pipes and hoses play a significant role in this case. Mathematical models are verified on experimental equipment. Pressure and position responses during sudden stop of a moving cylinder are measured on this equipment.

Bure?ek, A.; Hružík, L.; Vašina, M.

2013-04-01

173

Efficiency-optimised CVT hydraulic and clamping system  

Energy Technology Data Exchange (ETDEWEB)

An important target of modern transmission technology is the reduction of fuel consumption. The AUDI multitronic trademark currently in production with the LuK CVT components: pulley sets, chain, hydraulic control unit with pump and damper sets a very good standard with regard to efficiency, fuel consumption and dynamic behaviour. Compared to conventional 5 speed automatic transmissions there is a fuel consumption advantage of 9%, and the time for acceleration from 0 to 60 mph is improved by 1.3 s. These values are mainly influenced by the CVT components delivered by LuK as a system supplier. Further developments of the hydraulic control, in combination with new ideas for a slip controlled clamping, show a potential to reduce fuel consumption. The benefit of the described concept including the LuK chain amounts to 7.. 10% compared to conventional CVT technologies. (orig.)

Faust, H. [VDI (Germany); Homm, M.; Reuschel, M. [VDI, Buehl (Germany)

2002-07-01

174

Automated Hydraulic System Design and Power Management in Mobile Applications  

DEFF Research Database (Denmark)

Since the first oil crisis in the beginning of the 1970'ties there have been an increasing focus on energy and energy consumption, in the latter years also driven by the climate changes that are taking place. Hydraulic systems have, however, traditionally been characterised by low system efficiency and therefore there is today a shift towards using electric drives as replacement for hydraulic drives. There are, however, a number of different areas, where hydraulic systems offers possibilities that cannot be matched by electric drives, as the hydraulic systems are typically characterised by a much higher force, torque and power density. One of these areas is the mobile hydraulic area, which generally comprise all type of off-highway machinery, such as construction equipment, agricultural equipment etc. But where hydraulic systems earlier was designed with primary focus on cost, dynamic performance and accuracy, energy consumption is becoming an ever more important design parameter. At the same time as the first oil crisis the first hydraulic load sensing (LS) systems also emerged on the market, which, compared to the other systems of the time, offered significant energy saving potentials and which today are found on most medium and high-end mobile hydraulic machinery. Despite the energy saving potentials that these systems posses, compared to the other open-circuit hydraulic system topologies, LS-system may still be subject to very low system efficiencies if not designed correctly. This is typically the case for systems, with highly varying operating conditions and where more work functions (consumers) are operated simultaneously. The low system efficiency is in this regard not necessarily due to low component efficiencies, which often actually have an efficiency comparable to that of electrical machines if operated in the intended and optimal work area, but due to an inappropriate system layout. Most of the power lost in open circuit hydraulic system systems is in this regard in the transmission part, i.e. hosesand fittings, and the valves used to control the system. A large part of the design task is therefore to design the system so these losses may be minimised. The problem with this is that there exist no methods for how to do this, and the design task may generally be a very complex process, which requires substantial prior knowledge and experience. Having designed a systems no methods do either not exist for ensuring that the system designed is actually suited for a given application. Today a change is furthermore happening, where new and more intelligent components, which are electrically controllable, are emerging and more and more sensors are finding their way into the hydraulic machines. This also means that the door is opened for a new range of possibilities with regard to better system utilisation. The latter is both in regard to new functions and facilities, but also with regard to utilising the system in the most energy optimal way, ensuring that all components are working under the most optimal operating conditions. The above in this way constitute the background for the work that is the basis of this report, which deals with how to design and control open-circuit hydraulic systems with multiple consumers to obtain the largest energy utilization, when also considering other design parameters like installation cost, complexity and system performance. The report begins with a presentation and definition of the problem considered and a review of the work that has been made within the area of hydraulic load sensing (LS) systems throughout the last three decades. Through this, the different stability problems that are often encountered in LS-systems are explained along with how they may be avoided. In addition hereto an overview of the work that has been made in relation to electronic load sensing (ELS) systems is presented along with an overview of the other energy efficient system topologies that exist. Finally the first part is completed with an overview of the main contributions from the present work,also d

Pedersen, Henrik Clemmensen

2007-01-01

175

Study of the stable control system of a half-toroidal CVT during mode change - a comparison of hydraulic and mechanical loading devices  

Energy Technology Data Exchange (ETDEWEB)

In this paper, we compare some CVT systems and show that NSK's new coaxial power-split CVT has potential for higher efficiency, a wider ratio range, and is more compact. We have analyzed the influence of elastic deformation, clearance, and inertia during load transmission. Furthermore, we have compared hydraulic and mechanical loading devices, and have analyzed how they influence behavior during static and dynamic load transmission. These have been confirmed both theoretically and experimentally. (orig.)

Miyata, S.; Liu, D.; Inoue, E.; Machida, H.

2002-07-01

176

Systemic ozone effects on root hydraulic properties in pima cotton  

Energy Technology Data Exchange (ETDEWEB)

Ambient ozone concentrations have become problematic even in rural, agricultural areas such as the San Joaquin Valley of California. Pima cotton (cv. S6) has been shown to be relatively sensitive to ozone air pollution, at levels occurring in this production area. In this semi-arid area acquisition of water and nutrients may limit yield and biological productivity. Therefore maximal proliferation, exploration, and efficiency of root systems is desirable. Hydraulic conductance provides a parameter to characterize the efficiency of roots and shoots and their interaction. The authors have used a variety of transpiration and pressure vessel techniques to document ozone-induced reduction of root hydraulic conductance in cotton. They hypothesized that these effects are caused by reduced carbohydrate supply due to reduction of photosynthetic capacity of the shoot associated with direct oxidant damage to foliage. However, the authors simulated this reduced photosynthetic capacity by continuously removing leaf area to match that of ozone treated plants. This resulted in a reduction of whole plant biomass similar to ozone-treated plants, but a root/shoot biomass ratio and root hydraulic properties similar to control plants and contrasting with ozone-treated plants. Thus leaf removal did not simulate effects of ozone on root hydraulic properties. A systematic effect of ozone on whole plant function is indicated, perhaps mediated by direct effects on carbohydrate translocation throughout the plant.

Grantz, D.A.; Yang, S. [Univ. of California, Riverside, CA (United States)]|[Kearney Agricultural Center, Parlier, CA (United States)

1995-12-31

177

Failure Prevention of Hydraulic System Based on Oil Contamination  

Science.gov (United States)

Oil contamination is the major source of failure and wear of hydraulic system components. As per literature survey, approximately 70 % of hydraulic system failures are caused by oil contamination. Hence, to operate the hydraulic system reliably, the hydraulic oil should be of perfect condition. This requires a proper `Contamination Management System' which involves monitoring of various parameters like oil viscosity, oil temperature, contamination level etc. A study has been carried out on vehicle mounted hydraulically operated system used for articulation of heavy article, after making the platform levelled with outrigger cylinders. It is observed that by proper monitoring of contamination level, there is considerably increase in reliability, economy in operation and long service life. This also prevents the frequent failure of hydraulic system.

Singh, M.; Lathkar, G. S.; Basu, S. K.

2012-07-01

178

Pressure transient analysis of the Space Shuttle hydraulic system  

Energy Technology Data Exchange (ETDEWEB)

Detailed simulations of the Space Shuttle hydraulic system were developed to verify that all control functions could be performed under all unique conditions encountered during a space mission. These simulations have been used to analyze dynamic problems which could have threatened to destroy flight or test hardware. The RoHDA program was developed to analyze pressure transients in the time domain when the disturbances of interest occurred at frequencies below 100 hertz. The HSFR program was used to analyze transients that occurred above the 100 hertz. This program operates in the frequency domain. These programs were utilized on a digital computer to verify that the hydraulic system of the Space Shuttle Orbiter was ready to fly.

Morse, A.C.

1984-01-01

179

Effects of anaerobic selector hydraulic retention time on biological foam control and enhanced biological phosphorus removal in a pure-oxygen activated sludge system.  

UK PubMed Central (United Kingdom)

Increased anaerobic selector hydraulic retention times (HRTs) in a high-purity oxygen activated sludge process resulted in an increase in soluble orthophosphate release and biodegradable chemical oxygen demand removal, confirming that enhanced biological phosphorus removal occurs at aeration solids retention times (SRTs) below 1.7 days. Under operating conditions that included biological foam trapping and recycling, an anaerobic selector with HRTs higher than 55 minutes resulted in a decrease in filament counts and effective foam control. Effective norcardioform control is achieved through the combination of metabolic selective pressure and increased soluble organic substrate removal in the anaerobic selector and low aeration SRT.

Jolis D; Mitch AA; Marneri M; Ho CF

2007-05-01

180

Hydraulic characteristics in Top Entry System  

International Nuclear Information System (INIS)

The Japanese demonstration fast breeder reactor applies The Top Entry System in which the reactor vessel, intermediate heat exchanger (IHX) vessels and pump vessels are connected by inverted U-shaped coolant tubes. These vessels have free surfaces in themselves. These structural characteristics requires the evaluation of sloshing behavior inside these vessels during an earthquake in order to confirm that the cooling function will be maintained. Using a 1/3 scale model of the reactor vessel and IHX, vibration and hydraulic tests were carried out in order to study both the sloshing characteristics under the flowing condition in the reactor vessel and IHX and the hydraulic characteristics in the hot-leg pipe. It was confirmed that the descent of the free surface is relatively small compared to the insertion depth of the inverted U-shaped tubes, and as a consequence the gas involvement into the piping system is small, and the cooling function can be maintained during a severe earthquake. (author).

1994-01-01

 
 
 
 
181

Hydraulic and mechanical interactions of feedpump systems  

Energy Technology Data Exchange (ETDEWEB)

The dynamic behavior of boiler feed pumps is analyzed with respect to the effects of the hydraulic and mechanical system of which the pump is a part of. In a first section, methods are demonstrated for modelling the hydraulic system dynamically. The basis of this model are transfer matrices of all components in the system, pipes, valves, pumps etc. Transfer matrices were measured for two pumps. A simplified model was developed whose components can be calculated with sufficient accuracy from the pump geometry and the performance curve. Based on this pump model, complete feedwater systems can be investigated without having to test pumps. A survey method is presented also, which helps to avoid unfavorable acoustical resonances and placement of pumps and valves in the piping system. The next section is concerned with dynamic moments and forces acting at the drive end of the shaft, and with the torsional behavior of the entire shaft system. Based on a literature survey, guidelines are given for couplings, gears, drivers, alignment, and modelling of the torsional dynamic behavior of the shaft system. The last section deals with mechanical interactions, that is the effects of vibrations of the bearing housing, the pump casing and the pipes on the lateral rotor vibrations. These effects are investigated first on the basis of a mathematical model including the rotor, casing, bedplate and pipes. This is supplemented by experimental results from the full scale test pump. The investigation results in recommendations for the design of bedplates and bearing housings to avoid structural resonances in the operating range. It is shown that complete modelling of base plate, casing, rotor and pipes is normally not necessary, if above recommendations are followed, that is, the rotor's lateral vibration behavior may be calculated with sufficient accuracy by assuming rigid and non-vibration casing and bearing housings.

Bolleter, U.; Buehlmann, E.; Eberl, J.; Stirnemann, A. (Sulzer Bros. Ltd., Winterthur (Switzerland))

1992-09-01

182

Position and torque tracking: series elastic actuation versus model-based-controlled hydraulic actuation.  

Science.gov (United States)

Robotics used for diagnostic measurements on, e.g. stroke survivors, require actuators that are both stiff and compliant. Stiffness is required for identification purposes, and compliance to compensate for the robots dynamics, so that the subject can move freely while using the robot. A hydraulic actuator can act as a position (stiff) or a torque (compliant) actuator. The drawback of a hydraulic actuator is that it behaves nonlinear. This article examines two methods for controlling a nonlinear hydraulic actuator. The first method that is often applied uses an elastic element (i.e. spring) connected in series with the hydraulic actuator so that the torque can be measured as the deflection of the spring. This torque measurement is used for proportional integral control. The second method of control uses the inverse of the model of the actuator as a linearizing controller. Both methods are compared using simulation results. The controller designed for the series elastic hydraulic actuator is faster to implement, but only shows good performance for the working range for which the controller is designed due to the systems nonlinear behavior. The elastic element is a limiting factor when designing a position controller due to its low torsional stiffness. The model-based controller linearizes the nonlinear system and shows good performance when used for torque and position control. Implementing the model-based controller does require building and validating of the detailed model. PMID:22275654

Otten, Alexander; van Vuuren, Wieke; Stienen, Arno; van Asseldonk, Edwin; Schouten, Alfred; van der Kooij, Herman

2011-01-01

183

Position and torque tracking: series elastic actuation versus model-based-controlled hydraulic actuation.  

UK PubMed Central (United Kingdom)

Robotics used for diagnostic measurements on, e.g. stroke survivors, require actuators that are both stiff and compliant. Stiffness is required for identification purposes, and compliance to compensate for the robots dynamics, so that the subject can move freely while using the robot. A hydraulic actuator can act as a position (stiff) or a torque (compliant) actuator. The drawback of a hydraulic actuator is that it behaves nonlinear. This article examines two methods for controlling a nonlinear hydraulic actuator. The first method that is often applied uses an elastic element (i.e. spring) connected in series with the hydraulic actuator so that the torque can be measured as the deflection of the spring. This torque measurement is used for proportional integral control. The second method of control uses the inverse of the model of the actuator as a linearizing controller. Both methods are compared using simulation results. The controller designed for the series elastic hydraulic actuator is faster to implement, but only shows good performance for the working range for which the controller is designed due to the systems nonlinear behavior. The elastic element is a limiting factor when designing a position controller due to its low torsional stiffness. The model-based controller linearizes the nonlinear system and shows good performance when used for torque and position control. Implementing the model-based controller does require building and validating of the detailed model.

Otten A; van Vuuren W; Stienen A; van Asseldonk E; Schouten A; van der Kooij H

2011-06-01

184

Hydraulic system for a support section with Movamle baffle  

Energy Technology Data Exchange (ETDEWEB)

A hydraulic system for a support section with retractable baffle including a hydraulic prop, a hydraulic travel jack, a hydraulic jack for the retractable baffle, a multi-position hydraulic distributor, and water main check valve is proposed. To prevent exposing the roof when the support section moves and to eliminate self-propelled movement by the baffle, the section is equipped with a hydraulically balanced two-position switch, which is connected with the piston cavity of the baffle jack, and with the hydrodistributor, and with the logic unit by means of which the hydraulic distributor is connected to the rod cavity of the baffle jack. This approach decreases the amount of roof rock entering the working area when the support section is moving and prevents accidents.

Polyey, L.S.; Mikhailov, I.F.; Nuginov, P.N.

1980-08-07

185

Application of characteristic time concepts for hydraulic fracture configuration design, control, and optimization. Final report  

Energy Technology Data Exchange (ETDEWEB)

The analysis of pertinent energy components or affiliated characteristic times for hydraulic stimulation processes serves as an effective tool for fracture configuration designs optimization, and control. This evaluation, in conjunction with parametric sensitivity studies, provides a rational base for quantifying dominant process mechanisms and the roles of specified reservoir properties relative to controllable hydraulic fracture variables for a wide spectrum of treatment scenarios. Results are detailed for the following multi-task effort: (a) Application of characteristic time concept and parametric sensitivity studies for specialized fracture geometries (rectangular, penny-shaped, elliptical) and three-layered elliptic crack models (in situ stress, elastic moduli, and fracture toughness contrasts). (b) Incorporation of leak-off effects for models investigated in (a). (c) Simulation of generalized hydraulic fracture models and investigation of the role of controllable vaxiables and uncontrollable system properties. (d) Development of guidelines for hydraulic fracture design and optimization.

Advani, S.H.; Lee, T.S. [Lehigh Univ., Bethlehem, PA (United States); Moon, H. [Ohio State Univ., Columbus, OH (United States)

1992-10-01

186

Application of characteristic time concepts for hydraulic fracture configuration design, control, and optimization  

Energy Technology Data Exchange (ETDEWEB)

The analysis of pertinent energy components or affiliated characteristic times for hydraulic stimulation processes serves as an effective tool for fracture configuration designs optimization, and control. This evaluation, in conjunction with parametric sensitivity studies, provides a rational base for quantifying dominant process mechanisms and the roles of specified reservoir properties relative to controllable hydraulic fracture variables for a wide spectrum of treatment scenarios. Results are detailed for the following multi-task effort: (a) Application of characteristic time concept and parametric sensitivity studies for specialized fracture geometries (rectangular, penny-shaped, elliptical) and three-layered elliptic crack models (in situ stress, elastic moduli, and fracture toughness contrasts). (b) Incorporation of leak-off effects for models investigated in (a). (c) Simulation of generalized hydraulic fracture models and investigation of the role of controllable vaxiables and uncontrollable system properties. (d) Development of guidelines for hydraulic fracture design and optimization.

Advani, S.H.; Lee, T.S. (Lehigh Univ., Bethlehem, PA (United States)); Moon, H. (Ohio State Univ., Columbus, OH (United States))

1992-10-01

187

HYDRAULIC LINEAR ACTUATOR VELOCITY CONTROL USING A FEEDFORWARD-PLUS-PID CONTROL Qin Zhang  

UK PubMed Central (United Kingdom)

: A practical approach to design a feedforward-plus-proportional-integral-derivative(FPID) controller for accurate and smooth velocity control on a hydraulic linear actuator ispresented. The integrated controller consists of a feedforward loop and a PID loop. Thefeedforward loop is designed to compensate for the nonlinearity of the electrohydraulic system,including the deadband of the system and the nonlinear flow gain of the control valve. Afeedforward gain schedule determines the basic control input based on the command velocity. ThePID loop complements the feedforward control via velocity tracking error compensation. Alsopresented are comparisons of the experimental results from an open-loop feedforward controller, aconventional PID controller, and an integrated feedforward-PID (FPID) controller. In eachexperiment, the controllers were tuned to provide optimal responses. Results demonstrate that theFPID controller is capable of improving the accuracy and dynamic performanc...

Qin Zhang

188

MONITORING INTENSE THE DEFORMED CONDITION HYDRAULIC ENGINEERING CONSTRUCTIONS MELIORATIVE SYSTEMS ?????????? ??????????-???????????????? ????????? ???????????????? ?????????? ????????????? ??????  

Directory of Open Access Journals (Sweden)

Full Text Available Results of operational monitoring are given is long maintained GTS of meliorative systems with nondestructive control methods. Possibility of use of devices of nondestructive control is especially noted at inspection of hydraulic engineering constructions, on an example of water carrying out channels that allows operatively, without additional damages, to receive an objective assessment of their technical condition. When using this approach, there is a possibility justification of parameters of defects and damages, which is impossible to establish at visual survey. The program complex for modeling of a technical condition of holding channels for calculation of predicted term of their service is also presented

Volosoukhin V. A.

2012-01-01

189

Parameter Designing for Heave Compensation Hydraulic System Installed in Deepwater  

Directory of Open Access Journals (Sweden)

Full Text Available The function diagram of active heave compensation hydraulic system has been given, besides, the mathematics model for the principal hydraulic components of the compensation system has been built, and the input-output relation between components has been made clear. Aimed at compensating work capacity for the system, design and research on parameters as the bearing pressure, the initial state and the maximum flow of hydraulic cylinder, accumulator and other principal components have been made separately, and standardized design has been accomplished in accordance with relevant standards. Furthermore, calculus and verification for the capacity of the hydraulic system in different working stages have been made in order to calculate the pressure lose of the system and provide objective data for the hardware system design of the hydraulic components of the heave compensation system.

GU Lei; Tan Jiawan; Zhao Teng

2013-01-01

190

Hydraulic issues in the design of chilled water storage systems  

Energy Technology Data Exchange (ETDEWEB)

Hydraulic aspects of chilled water thermal storage system design are discussed. Both energy consumption and control issues are addressed. Thermal storage transfer pumping energy should be a small fraction of chilled water production and distribution energy consumption but may be significant under adverse circumstances, some of which are within the designer`s control. The energy consumption consequences of design decisions regarding system pressurization, location of thermal storage points of connection, and storage siting location are discussed and strategies for reducing energy consumption are described. The variable flow typical of chilled water storage systems coupled with large static pressure differences creates stability and pressure surge hazards infrequently encountered in non-storage systems. Conditions that tend to promote control instability and excessive pressure transients are discussed and measures to mitigate them are suggested.

Bahnfleth, W.P. [Pennsylvania State Univ., PA (United States)

1995-09-01

191

Controlling process water during hydraulic stowing  

Energy Technology Data Exchange (ETDEWEB)

Describes experiments carried out during hydraulic stowing in the extraction area of thin, gently sloping seams in the Kapital'naya coal mine belonging to Donetskugol' using a new device which purifies the waste water and then removes it by pipeline or drainage channel. The device contains a hydrocyclone of 800 mm diameter, a flocculant solvent, storage space (2 VG-3,3 wagons), an 8GRU12 slurry pump, a 1V20/10 screw pump, pipes and connectors. Main specifications are given, including: process water capacity - 400 m/sup 3//hour, minimum solid matter content in hydrocyclone drain - 3 g/l, maximum polyacrylamide consumption - 200 g/l, dimensions - 3700x1500x1500 mm, overall weight - 6000 kg. Results showed advisability of removing slurry by means of scraper conveyor as it may contain 32-70% combustibles. Although the trials were successful in principle, further research is needed to perfect the device.

Dudenko, I.I.; Fedorov, V.P.; Maslyaev, G.V.

1987-03-01

192

Parameter Designing for Heave Compensation Hydraulic System Installed in Deepwater  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The function diagram of active heave compensation hydraulic system has been given, besides, the mathematics model for the principal hydraulic components of the compensation system has been built, and the input-output relation between components has been made clear. Aimed at compensating work capa...

GU Lei; Tan Jiawan; Zhao Teng

193

State of the art-hydraulic yaw systems for wind turbines  

DEFF Research Database (Denmark)

This paper addresses the yawing systems of Horizontal Axis Wind Turbines (HAWT’s). HAWT’s represents close to all of the commercial large wind turbines sold today and must be considered state-of-the art within wind turbine technology. Two choices exists when considering components for the active yaw system of a HAWT, electro-mechanical or hydraulic components. In the first generation of larger WT’s hydraulic yaw systems outnumbered the electrical, but in the more recent years there has been a clear shift toward electrical drives, where the yaw drive consist of multiple induction motors each mounted with a reduction gear. This paper presents state-of-the art within; hydraulic yaw system design and control of yaw systems in general. Primary focus on the advantages and disadvantages of using a hydraulic system for controlling the yaw of a wind turbine with a soft yaw concept.

Stubkier, SØren; Pedersen, Henrik C.

2011-01-01

194

Proceedings of the Twenty-First Water Reactor Safety Information Meeting: Volume 1, Plenary session; Advanced reactor research; advanced control system technology; advanced instrumentation and control hardware; human factors research; probabilistic risk assessment topics; thermal hydraulics; thermal hydraulic research for advanced passive LWRs  

International Nuclear Information System (INIS)

This three-volume report contains 90 papers out of the 102 that were presented at the Twenty-First Water Reactor Safety Information Meeting held at the Bethesda Marriott Hotel, Bethesda, Maryland, during the week of October 25--27, 1993. The papers are printed in the order of their presentation in each session and describe progress and results of programs in nuclear safety research conducted in this country and abroad. Foreign participation in the meeting included papers presented by researchers from France, Germany, Japan, Russia, Switzerland, Taiwan, and United Kingdom. The titles of the papers and the names of the authors have been updated and may differ from those that appeared in the final program of the meeting. Individual papers have been cataloged separately. This document, Volume 1 covers the following topics: Advanced Reactor Research; Advanced Instrumentation and Control Hardware; Advanced Control System Technology; Human Factors Research; Probabilistic Risk Assessment Topics; Thermal Hydraulics; and Thermal Hydraulic Research for Advanced Passive Light Water Reactors.

1994-01-01

195

Proceedings of the Twenty-First Water Reactor Safety Information Meeting: Volume 1, Plenary session; Advanced reactor research; advanced control system technology; advanced instrumentation and control hardware; human factors research; probabilistic risk assessment topics; thermal hydraulics; thermal hydraulic research for advanced passive LWRs  

Energy Technology Data Exchange (ETDEWEB)

This three-volume report contains 90 papers out of the 102 that were presented at the Twenty-First Water Reactor Safety Information Meeting held at the Bethesda Marriott Hotel, Bethesda, Maryland, during the week of October 25--27, 1993. The papers are printed in the order of their presentation in each session and describe progress and results of programs in nuclear safety research conducted in this country and abroad. Foreign participation in the meeting included papers presented by researchers from France, Germany, Japan, Russia, Switzerland, Taiwan, and United Kingdom. The titles of the papers and the names of the authors have been updated and may differ from those that appeared in the final program of the meeting. Individual papers have been cataloged separately. This document, Volume 1 covers the following topics: Advanced Reactor Research; Advanced Instrumentation and Control Hardware; Advanced Control System Technology; Human Factors Research; Probabilistic Risk Assessment Topics; Thermal Hydraulics; and Thermal Hydraulic Research for Advanced Passive Light Water Reactors.

Monteleone, S. [Brookhaven National Lab., Upton, NY (United States)] [comp.

1994-04-01

196

Acceptance Test Report for 241-SY Pump Cradle Hydraulic System  

International Nuclear Information System (INIS)

The purpose of this ATP is to verify that hydraulic system/cylinder procured to replace the cable/winch system on the 101-SY Mitigation Pump cradle assembly fulfills its functional requirements for raising and lowering the cradle assembly between 70 and 90 degrees, both with and without pump. A system design review was performed on the 101-SY Cradle Hydraulic System by the vendor before shipping (See WHC-SD-WM-DRR-045, 241-SY-101 Cradle Hydraulic System Design Review). The scope of this plan focuses on verification of the systems ability to rotate the cradle assembly and any load through the required range of motion

1995-01-01

197

Acceptance Test Report for 241-SY Pump Cradle Hydraulic System  

Energy Technology Data Exchange (ETDEWEB)

The purpose of this ATP is to verify that hydraulic system/cylinder procured to replace the cable/winch system on the 101-SY Mitigation Pump cradle assembly fulfills its functional requirements for raising and lowering the cradle assembly between 70 and 90 degrees, both with and without pump. A system design review was performed on the 101-SY Cradle Hydraulic System by the vendor before shipping (See WHC-SD-WM-DRR-045, 241-SY-101 Cradle Hydraulic System Design Review). The scope of this plan focuses on verification of the systems ability to rotate the cradle assembly and any load through the required range of motion.

Koons, B.M.

1995-03-08

198

Analysis of and H? Controller Design For An Electro-Hydraulic Servo Pressure Regulator  

DEFF Research Database (Denmark)

Currently mobile hydraulics is in a transition phase, where electronic sensors and digital signal processors are becoming standard on a high number of machines, hereby replacing hydraulic pilot lines and offering new possibilities with regard to both control and feasibility. As most open-circuit pumps are still hydraulically controlled, there is however still a need for being able to generate a hydraulic pilot pressure. The focus of the current paper is on the analysis and controller design of an electrohydraulic servo pressure regulator, which generates a hydraulic LS-pressure for a variable displacement pump based on an electrical reference. The paper first presents the considered system and an experimentally verified model of this. A linearized model and a stability analysis is then presented, based on which an H?control strategy is selected. A nominal performance and a robustly stable controller are designed and tested in simulation and experimentally. Finally both controllers are compared to the reference system, finding that similar performance may be obtained, but the used FPGA limits the performance.

Stubkier, SØren; Pedersen, Henrik C.

2011-01-01

199

New requirements for hydraulic control fluids and discharge to sea gives unexpected operational problems  

Energy Technology Data Exchange (ETDEWEB)

Objective: Replacing existing hydraulic control fluids at all Statoils Subsea Installations to meet the new SFT requirements 1) What makes the change of fluid so sensitive regarding system-operability and long term reliability. Statoil's subsea hydraulic control fluids are basicly water based fluids with approximately 90% water/glycol content, the remaining 10% are additives to contribute to lubricity, general properties and long term stability. Having close to 300 different materials making interactions between each other and the properties of the hydraulic fluid, make any reactions difficult to predict. (chemical/ and galvanic reactions). 2) The consequences of failing in replacing the existing hydraulic fluids could be a full stop in part of Statoils subsea production. Some facts about the hydraulic fluids are presented. The study concludes that the investments of millions NOK and the time and focus from specialists and engineers from the major suppliers (and the oil-industri), have not only contributed to an environmentally better product, but also to a much better understanding of the complexity in the design of more acceptable hydraulic control-fluids. (Author)

Soerum, Anders

2006-03-15

200

Engine including hydraulically actuated valvetrain and method of valve overlap control  

Energy Technology Data Exchange (ETDEWEB)

An exhaust valve control method may include displacing an exhaust valve in communication with the combustion chamber of an engine to an open position using a hydraulic exhaust valve actuation system and returning the exhaust valve to a closed position using the hydraulic exhaust valve actuation assembly. During closing, the exhaust valve may be displaced for a first duration from the open position to an intermediate closing position at a first velocity by operating the hydraulic exhaust valve actuation assembly in a first mode. The exhaust valve may be displaced for a second duration greater than the first duration from the intermediate closing position to a fully closed position at a second velocity at least eighty percent less than the first velocity by operating the hydraulic exhaust valve actuation assembly in a second mode.

Cowgill, Joel (White Lake, MI)

2012-05-08

 
 
 
 
201

Spool-type control valve assembly with reduced spool stroke for hydraulic belt-and-pulley type continuously variable transmission  

Energy Technology Data Exchange (ETDEWEB)

This patent describes a hydraulic control system for controlling a speed ratio of a hydraulically-operated continuously variable transmission of belt-and-pulley type having a variable-diameter pulley and a hydraulic cylinder for changing an effective diameter of the variable diameter-pulley of the transmission. The hydraulic control system includes a speed-ratio control valve assembly for controlling the supply and discharge of a pressurized fluid to and from the hydraulic cylinder to thereby change the speed ratio of the transmission. The speed-ratio control valve assembly comprises: a shift-direction switching valve unit disposed in fluid supply and discharge conduits communicating with the hydraulic cylinder, for controlling a direction in which the speed ratio of the transmission is varied; a shift-speed control valve unit of spool-valve type connected to the shift-direction switching valve unit. The shift-speed control valve unit is selectively placed in a first state in which the fluid supply and discharge flows to and from the hydraulic cylinder through the conduits are permitted, or in a second state in which the fluid supply flow is restricted while the fluid discharge flow is inhibited; an actuator means for placing the shift speed control valve unit alternately in the first and second states to control a rate of variation in the speed ratio of the transmission in the direction established by the shift-direction switching valve unit.

Itoh, H.; Akashi, T.; Takada, M.

1987-03-31

202

Trends in Design of Water Hydraulics : Motion Control and Open-Ended Solutions  

DEFF Research Database (Denmark)

The paper presents and discusses a R&D-view on trends in development and best practise in design of both low-pressure and high-pressure tap water hydraulic components and systems for motion control as well as open-ended solutions various industrial applications. The focus is on the advantages using ordinary tap water and the range of application areas are illustrated with examples, in particular within the food processing industry, humidification operations, water mist systems for fire fighting, high water pressure cleaners, water moisturising systems for wood processing, lumber drying process and mobile machines and equipment that operate in environmentally sensitive surroundings. Today’s progress in water hydraulics includes electro-water hydraulic proportional valves and servovalves for design of motion control solutions for machines and robots. The remarkable property is that the components operate with pure water from the tap without additives of any kind. Hence water hydraulics takes the benefit of purewater as fluid being environmentally friendly, easy to clean sanitary design, non-toxic, non-flammable, inexpensive, readily available and easily disposable. The low-pressure tap water hydraulic systems cover up to around 50 bar, and 2-4 kW having a strong potential to compete with pneumatic and electrical solutions in many applications. The high-pressure water hydraulic systems cover typically up to 160 bar pressure from pump and to motors and actuators 140 bar. Recently, dedicated pumps and accessories running with sea-water as fluid are available. A unique solution is to use reverse osmosis to generate drinking water from sea-water, and furthermore for several off-shore applications. Furthermore, tap water hydraulic components of the Nessie® family and examples of measured performance characteristics are presented and the trends in industrial applications and need for future are discussed.

Conrad, Finn Technical University of Denmark,

2005-01-01

203

High-pressure hydraulic system for a continuously variable transmission; Belt shiki mudan hensokuki no koyuatsu system  

Energy Technology Data Exchange (ETDEWEB)

In a belt-type continuously variable transmission (CVT), the belt-clamping force is produced by a hydraulic piston and the speed is changed by the stroke of the piston. Such being the case, the hydraulic system demands a higher pressure and greater flow than the conventional automatic transmission and, for the improvement of fuel consumption and drivability, it should be so arranged that an appropriate gear ratio is available even during transition. For the improvement of vehicle fuel consumption, it is important to develop a variable gear ratio servo system for the hydraulic system of the belt-type CVT, this for the reduction of energy consumption and for the embodiment of desired gear ratio characteristics. In this report, the hydraulic system for the CVT and part of the applied technology are outlined. In the case of a large-capacity belt-type CVT, thanks to the employment of the hydraulic system discussed here, the required flow is decreased and optimum hydraulic control is performed under all driving conditions, and these keep low the power that the hydraulic system consumes. This contributes to the improvement of vehicle fuel consumption. The high-pressure hydraulic system which the conventional automatic transmission lacks is kept from being large in dimension, and reliability is at the same time assured. (NEDO)

Oshidari, T. [Nissan Motor Co. Ltd., Tokyo (Japan)

1999-03-15

204

Self-unloading vehicle with hydraulic system  

UK PubMed Central (United Kingdom)

Self-unloading vehicle with hydraulic system preferably of the kind to be used for loading and unloading of cereals and grains, of varied density, size and weight. It is possible to use any kind of grains adjusting its unloading thanks to a gate or blade mechanism (3) and to a secondary container (4) located next to the hopper (1) itself, and it is also possible to use said secondary container (4) as an extra storage for a harvester machine. This vehicle comprises a second container (4) situated adjacent to the first container (1), in which wall (1a) there is an unloading mouth (3) for the product. Said unloading mouth (3) faces the entrance mouth of the second container (4) and a means of transportation (5) located in said second container (4) and where said main container (1) articulates according to a shaft (7) transverse to the vehicle situated between the main container (1) and said second container (4), and it has lifting means (2) capable to achieve the articulation movement of lifting and lowering the main container (1).

LENARDUZZI NELSON HECTOR; GONZALEZ JOSE LUIS; CAULA DIEGO ALEJANDRO

205

Hydraulic system with active residual backwater for mechanized extracting complexes  

Energy Technology Data Exchange (ETDEWEB)

An examination is made of the realized design improvements in the hydraulic system of mechanized stoping complexes OMKT-M and OKP designed for specific conditions of the lines in the Zapadnomaritskiy Basin. The valve block of the active residual backwater was designed jointly by the Bulgarian institute MNTPKI ''Minproyekt'' and the institute of mining imeni A. A. Skochinskiy. It was the basis for designing a new mechanized complex with hydraulic system equipped with flexible main pipelines. Basic technical parameters of the new hydraulic system are presented.

Khadzhidimov, G.; V' rbanova, P.

1981-01-01

206

Development of A Hydraulic Drive for a novel Diesel-Hydraulic system for Large commercial Vehicles  

DEFF Research Database (Denmark)

The objectives and results of the research project Hybrid Diesel-Hydraulic System for Large commercial vehicles, e.g. urban freight delivery, buses or garbage trucks. The paper presents and discusses the research and development of the system, modelling approach and results from preliminary performance tests on a 10 ton vehicle.

Stecki, J. S.; Conrad, Finn

2002-01-01

207

Technology of load-sensitivity used in the hydraulic system of an all-hydraulic core rig  

Energy Technology Data Exchange (ETDEWEB)

Existing hydraulic systems always have problems of temperature rise, running stability and anti-interference of the implementation components, reliability of hydraulic components, maintenance difficulties, and other issues. With high efficiency, energy saving, reliability, easy operating, stable running, anti-interference ability, and other advantages, a load-sensitive hydraulic system is more suitable for coal mine all-hydraulic core rig. Therefore, for the technical development of the coal mine all-hydraulic core rig, the load-sensitive technology employed by the rig should be of great significance. 10 refs., 6 figs.

De-zhong Xin; Song-ling Chen; Qing-feng Wang [China Coal Research Institute, Chongqing (China). Chongqing Research Institute

2009-09-15

208

Structure Parameters Optimization Analysis of Hydraulic Hammer System  

Directory of Open Access Journals (Sweden)

Full Text Available In order to improve the impact performance, the structure of hydraulic hammer should be optimized. In this paper, the ranges of eight vital structure parameters of piston and reversing valve system of hydraulic hammer were selected firstly; and then found the best value of different parameters under experiments with the method of computer optimization and the parametric analysis method provided by ADAMS software. These methods worked and the best design values of parameters of hydraulic hammer were obtained. At last, the optimal impact energy of virtual prototype of hydraulic breaking hammer was calculated and compared with the original impact performance. The results reveal that impact performance of hydraulic hammer has been improved significantly.

Guoping Yang; Jian Fang

2012-01-01

209

Hydraulic Soft Yaw System for Multi MW Wind Turbines  

DEFF Research Database (Denmark)

Horizontal axis wind turbines utilize a yaw system to keep the rotor plane of the wind turbine perpendicular to the main wind direction. If the wind direction changes, the wind turbine follows the direction change by yawing. If the wind turbine does not yaw, there will be a reduction in produced energy and an increase in the loading of the wind turbine structure and components. This dissertation examines the hypothesis that there are advantages of basing a yaw system on hydraulic components instead of normal electrical components. This is done through a state of the art analysis followed by a systematic concept generation and analysis of different concepts, where a single concept is chosen for further analysis. A preliminary analysis, based on simulations of the NREL 5 MW turbine modified to include a soft yaw system, show that the soft yaw concept chosen leads to signicant load reductions in the wind turbine yaw system along with minor reductions in the blades and main shaft. Optimization of the damping and stiffness of the hydraulic soft yaw system have been conducted and an optimum found for load reduction. Linear control algorithms for control of damping pressure peaks have been developed and tested in simulations with success. To verify the results of the new hydraulic soft yaw concept a novel friction model for including coulomb in the yaw system is developed and implemented in the FAST aeroelastic code from NREL in order to include friction phenomena. A cosimulation interface between the full turbine code in FAST, and the mathematical model of the hydraulic yaw system in Matlab/Simulink and Amesim is developed in order to analyze a full scale model of the hydraulic yaw system in combination with the implemented friction model for the yaw system. These results are also promising regarding load reduction and operating conditions for the hydraulic components. The results for simulations of a normal stiff yaw system, a yaw system with friction plate yaw bearing and a yaw system with a roller type bearing with low friction are analyzed and so is the loading of the systems. Based on the results a full scale test rig is designed and constructed for workshop testing and model validation. The test rig is designed so that it is possible to apply loads directly from the FAST simulations and hence get realistic results. Results from the test rig are presented and analyzed and the hydraulic model validated for further testing in the co-simulation environment. All test are performed according to the standard IEC 61400-1; Wind turbines- Part 1: Design requirements, why the load cases may be recognized from this standard. The model is further used for testing of the developed self yaw system, which enables the turbine to yaw without any energy input, but simply by utilizing the loading from the wind to turn in the right direction. Further the concept of the over-load protection system is analyzed and found very efficient for lowering the ultimate loading on the wind turbine structure. The influence on theenergy capture is analyzed and by the present simulation standards it is hard to quantify the inuence of the soft yaw system, however, the energy capture is increased for situations including a yaw error. The research documented in this dissertation has contributed with a concept evaluation of nine concepts for hydraulic yaw systems and shown that the loading of the turbine structure may be damped if the yaw system is allowed to deflect under loading. An extensions of the open source wind turbine code FAST of a state of the art wind turbine including the yaw degree of freedom and friction in the yaw bearing has furthermore been made public available. A passive self yaw system has been designed, analyzed and patented for off grid operation and operation above rated wind speed. The positive effects of a well defined over-load protection system has also been analyzed and documented. The conclusion of the research presented in this dissertation is a product ready to be tailored to fit OEM prototype turbines for field tests.

Stubkier, SØren

2013-01-01

210

Design of a Hydraulic Motor System Driven by Compressed Air  

Directory of Open Access Journals (Sweden)

Full Text Available This paper presents the design of a highly efficient pneumatic motor system. The air engine is currently the most generally used device to convert potential energy of compressed air into mechanical energy. However, the efficiency of the air engines is too low to provide sufficient operating range for the vehicle. In this study, the energy contained in compressed air/pressurized hydraulic oil is transformed by a hydraulic motor to mechanical energy to enhance the efficiency of using air power. To evaluate the theoretical efficiency, the principle of balance of energy is applied. The theoretical efficiency of converting air into hydraulic energy is found to be a function of pressure; thus, the maximum converting efficiency can be determined. To confirm the theoretical evaluation, a prototype of the pneumatic hydraulic system is built. The experiment verifies that the theoretical evaluation of the system efficiency is reasonable, and that the layout of the system is determined by the results of theoretical evaluation.

Dein Shaw; Jyun-Jhe Yu; Cheng Chieh

2013-01-01

211

Capsule injection system for a hydraulic capsule pipelining system  

Science.gov (United States)

An injection system for injecting capsules into a hydraulic capsule pipelining system, the pipelining system comprising a pipeline adapted for flow of a carrier liquid therethrough, and capsules adapted to be transported through the pipeline by the carrier liquid flowing through the pipeline. The injection system comprises a reservoir of carrier liquid, the pipeline extending within the reservoir and extending downstream out of the reservoir, and a magazine in the reservoir for holding capsules in a series, one above another, for injection into the pipeline in the reservoir. The magazine has a lower end in communication with the pipeline in the reservoir for delivery of capsules from the magazine into the pipeline.

Liu, Henry (Columbia, MO)

1982-01-01

212

The electro-hydraulic valvetrain system; Die elektrohydraulische Ventilsteuerung  

Energy Technology Data Exchange (ETDEWEB)

The electro-hydraulic valvetrain system (EHVS) is one of the most flexible options for replacing the conventional mechanical camshaft by an electronically controlled actuator system. Thus, fully variable feeding and dissipation of the gases involved in the combustion process can be ensured. The EHVS provides high potential in view of the optimisation of fuel consumption, torque characteristics and emissions for conventional or even turbocharged gasoline and Diesel engines. This system also opens up completely new possibilities for varying the gas exchange of combustion engines. The scope of application includes self-ignition engines with homogeneous gasoline or Diesel mixture. An article from the AVL List GmbH and the Robert Bosch GmbH. (orig.)

Denger, D. [AVL List GmbH, Graz (Austria); Mischker, K [Robert Bosch GmbH, Gerlingen-Schillerhoehe (Germany)

2004-12-01

213

Thermal-Hydraulics of a steam discharge system  

International Nuclear Information System (INIS)

Physical characteristics of the steam discharge system of PWR, which consists of valves, piping, steam sparger, and steam accomodating tank, have been analyzed and a preliminary analysis system has been set up for development of the analysis and design methodology for the system. The work was the results of the second year research in the planned research period of four years. Analysis has been made for the characteristics of rapid transient and steady flow in the piping, steam condensation, small and hermetically sealed tank performance, bubble behavior and wall pressure oscillation in a large and open tank, coupling between wall pressure oscillation and structure vibration. Based on the analysis results, conceptual methods for controlling the hydraulic load on the wall have been devised and evaluated. (Author)

1993-01-01

214

Analysis and identification of leakage failure in hydraulic system of hydraulic powered support  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Diagnosing the faults of hydraulic support system, used in underground longwall mining, is very complex and time consuming as sometimes the relation between the cause and the result of the faults is vague. In addition, the definitions of cause and result are vague as well. This paper details the app...

Yao, Z; Yang, Z; Lin, B

215

The hydraulic system of trees: theoretical framework and numerical simulation  

Science.gov (United States)

Empirical studies pose the problem of the physiological integration of the tree organism, which is also important on the scale of ecosystems. Recently, spatially distributed models emerged, which approach this problem by reflecting the close linkage between physiological processes and the structures of trees and tree stands. In the case of water flow, the tree organism can be regarded as hydraulic system and the branched tree architecture as hydraulic network. Previous models of the hydraulic system either did not take into account the network structure, or they had shortcomings regarding the translation of the underlying physiological assumptions by the discrete computation method. We have developed a theoretical framework which takes the form of a numerical simulation model of tree water flow. A discrete initial boundary value problem (IBVP) combines the phenomena of Darcy flow, water storage and conductivity losses in the hydraulic network. The software HYDRA computes the solution of the IBVP. The theoretical derivation and model tests corroborate the consistent translation of the physiological assumptions by the computational method. Simulation studies enabled us to formulate hypotheses on the following points: (1) differences in the hydraulic segmentation between Picea abies and Thuja occidentalis, (2) responses of the hydraulic system to rapid transpiration changes and to a scenario of drought stress, and (3) how these responses depend on architectural quantities of the trees. The simulation studies demonstrated our possibilities of deriving theoretically well-founded hypotheses about the functioning of the hydraulic system and its relation to system structure. The numerical simulation model is designed as a tool for structure-function studies, which is able to treat tree architecture as independent variable. The model supports the integration of data on tree level, and it can be used for computer experiments which quantify the dynamics of the hydraulic system according to the concepts of system theory. Copyright 1999 Academic Press. PMID:10610755

Fruh; Kurth

1999-12-21

216

PWM-digital control of hydraulic actuator utilizing 2-way solenoid valves  

Energy Technology Data Exchange (ETDEWEB)

The objet of this study was to propose a mathematical model for the PWM-actuator system, to control digitally each types of hydraulic systems. This PWM hydraulic actuator system was made up of two 2-way solenoid valves operated in the PWM (pulse width modulation)-digital mode by a personal computer, a hydraulic actuator and pipes. The static and dynamic characteristics of the system were verified in comparison with experimental results, simulating numerically based on the proposed model. Main results were as follows: Representing the relationship between the valve displacement and the input voltage to the solenoid as a linear function with time lage existing between the input and output signals of the valves, the behavior of the on/off action of the solenoid valves were rationally described; hydraulic transient in the pipes connected with the solenoid valve could not be ignored while the valve were operated with high speed on/off action. It is necessary to attach importance to the natural frequency decreasing caused by existing of the element of pipes in the system on the view point of the resonance oscillation at PWM-digital control system. 8 references, 8 figures, 2 tables.

Muto, Takayoshi; Yamada, Hironao; Suematsu, Yoshikazu

1988-07-15

217

Hydraulic control apparatus for a continuously variable transmission  

Energy Technology Data Exchange (ETDEWEB)

A hydraulic control apparatus is described for controlling a RPM of an engine in a motor vehicle using a continuously variable transmission. The transmission has a driving pulley mounted in an input shaft, the driving pulley comprising a fixed member and a movable member. The movable member is actuated by a hydraulic cylinder to form a V-shaped opening between the movable member and the fixed member. A driven pulley is mounted on an output shaft. The driven pulley comprises another fixed member and another movable member. The another movable member is similarly actuated by another hydraulic cylinder supplied with a line pressure to form another v-shaped opening between the another movable member and the another fixed member and an endless belt member spanning the pulleys so that an effective diameter of the pulleys can be varied with regard to each other so that different speed ratios can be obtained. The apparatus comprises: a first torque sensing means for detecting an input torque on the input shaft of the driving pulley generated by the power stroke of the engine and for outputting an input torque signal. The first torque sensing means is in communication with the input shaft; a second torque sensing means for detecting an output torque on the output shaft of the driven pulley generated by the power stroke of the engine and for outputting an output torque signal. The second torque sensing means is in communication with the output shaft; and a control circuit.

Tokoro, S.; Shigematsu, T.; Watanabe, T.

1986-12-23

218

Reproducibility in a multiloop thermal-hydraulic system  

International Nuclear Information System (INIS)

A sufficiently large data base of repeated integral thermal-hydraulic loop tests has been accumulated recently from which generalized conclusions can be drawn. Evidence obtained from experiments performed in the University of Maryland College Park (UMCP) loop show that qualitative as well as quantitative differences exist between integral and separate effect tests. For separate effect tests, flow conditions are controlled continuously and usually steady (or quasi-steady) states are of interest. Integral facilities are ''closed'' systems and reactor safety oriented investigations center on transient behavior for which only initial conditions can be specified. It is shown that integral flow systems have a generic capability of amplifying (or damping) small perturbations and usually can operate in one of several possible alternate flow states. These characteristics can lead to two distributions of interexperiment variations; the differences can follow a Gaussian distribution or a bifurcation. In the UMCP test program, several examples of repeat experiments whose trajectories fall outside a Gaussian distribution were observed

1988-01-01

219

Modeling and control of a hydraulically actuated flexible-prismatic link robot  

International Nuclear Information System (INIS)

Most of the research related to flexible link manipulators to date has focused on single link, fixed length, single plane of vibration test beds. In addition, actuation has been predominantly based upon electromagnetic motors. Ironically, these elements are rarely found in the existing industrial long reach systems. This manuscript describes a new hydraulically actuated, long reach manipulator with a flexible prismatic link at Oak Ridge National Laboratory (ORNL). Focus is directed towards both modeling and control of hydraulic actuators as well as flexible links that have variable natural frequencies

1996-01-01

220

Vehicle speed control system  

Energy Technology Data Exchange (ETDEWEB)

This patent describes a vehicle speed control system for performing vehicle speed control by controlling the displacement of at least one of a hydraulic pump and a hydraulic motor of a hydraulic transmission through an electric servo device, comprising: vehicle speed setting means for generating a voltage signal corresponding to a vehicle speed to be set; compensating means interposed between the vehicle speed setting means and the electric servo device, the compensating means comprising a first delay element; and second delay element having a response characteristic slower than that of the first delay element. A selecting means for judging as to whether a voltage signal changed by the operation of the vehicle speed setting means represents an acceleration command or a deceleration command and for selecting the first delay element when the voltage signal represents an acceleration command and for selecting the second delay element when the voltage signal represents a deceleration command.

Yoshida, D.; Tanno, T.; Fukunaga, T.

1987-06-16

 
 
 
 
221

Electronic control systems. Elektronische Regelung  

Energy Technology Data Exchange (ETDEWEB)

The invention deals with the simple design of an electronic controller for Diesel-engines. A failure of the control system may not effect mechanical damage of the motor. For resolving this task, a hydraulic actuator, related to the controller, is provided. The hydraulic system could be effected by the fuel or oil pressure and controls the fuel injection pump. The injection pump reaches a pre-selected work position if the controller fails. A 3-way-valve acts as regulator. The control system receives many operating signals of the Diesel-engine, converts these signals and transmits control signals to the injection pump actuator.

Burckhardt, C.

1981-09-10

222

Contaminant monitoring of hydraulic systems. The need for reliable data  

Energy Technology Data Exchange (ETDEWEB)

The need for both reliable operation of hydraulic and lubrication systems and long component lives has focused users to the benefits of controlling the contamination in the hydraulic fluid. Maximum operating (target) levels are being implemented as part of a condition based maintenance regime. If these are exceeded, maintenance effort is directed to correcting the rise in consummation level, and so make optimum use of resources as maintenance effort is only affected when it is necessary to do so. Fundamental to ibis aspect of condition based monitoring is the provision of accurate and reliable data in the shortest possible time. This way, corrective actions can be implemented immediately so minimising the damage to components. On-line monitoring devices are a way of achieving this and are seeing increased use, but some are affected by the condition of the fluid. Hence, there is a potential for giving incorrect data which will waste time and effort by initiating unnecessary corrective actions. A more disturbing aspect is the effect on the user of continual errors. The most likely effect would be a loss of confidence in the technique or even complete rejection of it and hence the potential benefits will be lost. This presentation explains how contaminant monitoring techniques are applied to ensure that the potential benefits of operating with clean fluids is realised. It examines the sources of error and shows how the user can interrogate the data and satisfy himself of its authenticity. (orig.) 14 refs.

Day, M.J. [Pall Europe Ltd., Portsmouth (United Kingdom)] Rinkinen, J. [Tampere University of Technology, Tampere (Finland)

1997-12-31

223

Application of multi-sensor information fusion technology on fault diagnosis of hydraulic system  

International Nuclear Information System (INIS)

The structural layers and methods of multi-sensor information fusion technology are analysed, and its application in fault diagnosis of hydraulic system is discussed. Aiming at hydraulic system, a model of hydraulic fault diagnosis system based on multi-sensor information fusion technology is presented. Choosing and implementing the method of information fusion reasonably, the model can fuse and calculate various fault characteristic parameters in hydraulic system effectively and provide more valuable result for fault diagnosis of hydraulic system.

2012-11-26

224

Application of multi-sensor information fusion technology on fault diagnosis of hydraulic system  

Science.gov (United States)

The structural layers and methods of multi-sensor information fusion technology are analysed, and its application in fault diagnosis of hydraulic system is discussed. Aiming at hydraulic system, a model of hydraulic fault diagnosis system based on multi-sensor information fusion technology is presented. Choosing and implementing the method of information fusion reasonably, the model can fuse and calculate various fault characteristic parameters in hydraulic system effectively and provide more valuable result for fault diagnosis of hydraulic system.

Zhang, L. Q.; Yang, G. L.; Zhang, L. G.; Zhang, S. Y.

2012-11-01

225

State of Art of the CAREM-25 Hydraulic Control Rod Drives Feasibility Analysis  

International Nuclear Information System (INIS)

[en] The proposed design adopted for the control rod drives for the CAREM reactor is based on a hydraulic system.As any innovative device, the design process requires to obtain experimental evidence to identify the most important control parameters and to set their relationship with other design parameters, in order to guarantee its feasibility as a previous step to the design qualification tests at the working conditions at the reactor.This paper features a global evaluation of the analysis performed and experimental results obtained in a low pressure loop, design improvements, limiting phenomena identified and corrective actions analyzed or proposed.The evaluation is based on a repetitivity, sensitivity and scalability study of the control parameters and test conditions, as well as the dynamic response between rod drive and the hydraulic system and features related with the mechanical design.Obtained results show that present system has an adequate response compatible with functional and manufacturing requirements

2000-01-01

226

Hydraulic-turbine control is simple for small power production  

Energy Technology Data Exchange (ETDEWEB)

How small hydraulic turbines produce power to drive one of two basic types of generators (induction or synchronous) to generate electric power is examined. Most small hydraulic turbines/generators are used to supplement power to the utility grid. Summarizes the differences between induction and synchronous generators, and notes that for most small-hydropower applications, the induction generator is usually the best choice. Advantages of the synchronous generator are that it is suitable for isolated operation, it contributes to the maintenance of system voltage and power factor, and, in general, it has higher efficiencies. Safety precautions are outlined. Exact speed regulation needed at utility hydro plants is unnecessary when the turbine/generator is merely supplementing power to the main grid.

Shafer, L.

1982-08-01

227

Hydraulic External Pre-Isolator System for LIGO  

CERN Document Server

The Hydraulic External Pre-Isolator (HEPI) is the first 6 degrees of freedom active seismic isolation system implemented at the Laser Interferometer Gravitational Wave Observatory (LIGO). Implementation was first completed at the LIGO Livingston Observatory (LLO) prior to LIGO's 5th science run, successfully cutting down the disturbance seen by LLO's suspended optics in the two most prominent seismic disturbance bands, the microseism (0.1-0.3Hz) and the anthropogenic (1-3Hz) bands, by a factor of a few to tens. The improvement in seismic isolation contributed directly to LLO's much improved duty cycle of 66.7% and LIGO's triple coincident duty cycle of 53%. We report the design, control scheme, and isolation performance of HEPI at LLO in this paper. Aided with this success, funding for incorporating HEPI into the LIGO Hanford Observatory was approved and installation is currently underway.

Wen, S; Mason, K; Giaime, J; Abbott, R; Kern, J; O'Reilly, B; Bork, R; Hammond, M; Hardham, C; Lantz, B; Hua, W; Coyne, D; Traylor, G; Overmier, H; Evans, T; Hanson, J; Spjeld, O; Macinnis, M; Mailand, K; Sellers, D; Carter, K; Sarin, P

2013-01-01

228

Development of a thermal-hydraulic system code for simulators based on RELAP5 code  

International Nuclear Information System (INIS)

A thermal-hydraulic system code for simulators, RELAPSIM, was developed at NSSE based on RELAP5. The development procedure consists of three major parts. Firstly, time control function was added into the code to meet real-time calculation needs. Secondly, controlled dynamic data communication was improved, so that thermal-hydraulic parameters can be easily modified for further applications. Finally, functions controlling the computation procedure were embedded to achieve a full capability to simulate multiple operations, such as start-up, shutting down or freeze. This paper describes the main features of the new code. The results of code assessment and code application are presented and discussed

2005-01-01

229

Hydrocone Crusher : A new fast robust design of the hydraulic system  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This master thesis has been conducted at Sandvik Svedala. The thesis is the first step towards a new construction of a hydraulic system for a Hydrocone crusher. First we studied how contaminations entered the system of today. Then the work began with designing several concepts to control the crusher...

Vestman, Johan; Sjöberg, Patrik

230

25 kWe solar thermal stirling hydraulic engine system: Final conceptual design report  

Energy Technology Data Exchange (ETDEWEB)

This report documents the conceptual design and analysis of a solar thermal free-piston Stirling hydraulic engine system designed to deliver 25 kWe when coupled to the 11-meter Test Bed Concentrator at Sandia National Laboratories. A manufacturing cost assessment for 10,000 units per year was made by Pioneer Engineering and Manufacturing. The design meets all program objectives including a 60,000-hr design life, dynamic balancing, fully automated control, >33.3% overall system efficiency, properly conditioned power, maximum utilization of annualized insolation, and projected production costs of $300/kW. The system incorporates a simple, rugged, reliable pool boiler reflux heat pipe to transfer heat from the solar receiver to the Stirling engine. The free-piston engine produces high-pressure hydraulic flow which powers a commercial hydraulic motor that, in turn, drives a commercial rotary induction generator. The Stirling hydraulic engine uses hermetic bellows seals to separate helium working gas from hydraulic fluid which provides hydrodynamic lubrication to all moving parts. Maximum utilization of highly refined, field proven commercial components for electric power generation minimizes development cost and risk. The engine design is based on a highly refined Stirling hydraulic engine developed over 20 years as a fully implantable artificial heart power source. 4 refs., 19 figs., 3 tabs.

1988-01-01

231

Thermal hydraulic instrumentation system of the HTR-10  

Energy Technology Data Exchange (ETDEWEB)

The 10 MW high temperature gas-cooled reactor--test module (HTR-10) has many different characteristics compared with the pressure water reactor (PWR), such as special fuel elements, core construction, helium coolant and so on. Thus, the design of thermal hydraulic instrumentation system of the HTR-10 is also different from that of a PWR. This paper describes the design criteria and system integrating method of thermal hydraulic instrumentation systems in details. The main thermal instrumentation and devices specially developed for the HTR-10 are also introduced.

Zhong Shuoping E-mail: zyleaf@public.bta.net.cn; Hu Shouyin; Zha Meisheng; Li Shengqiang

2002-10-01

232

Thermal hydraulic instrumentation system of the HTR-10  

International Nuclear Information System (INIS)

[en] The 10 MW high temperature gas-cooled reactor--test module (HTR-10) has many different characteristics compared with the pressure water reactor (PWR), such as special fuel elements, core construction, helium coolant and so on. Thus, the design of thermal hydraulic instrumentation system of the HTR-10 is also different from that of a PWR. This paper describes the design criteria and system integrating method of thermal hydraulic instrumentation systems in details. The main thermal instrumentation and devices specially developed for the HTR-10 are also introduced

2002-01-01

233

Hydraulic characterization of a small groundwater flow system in fractured monzonitic gneiss  

International Nuclear Information System (INIS)

The hydraulic characteristics of a small groundwater flow system active in a 200-m by 150-m by 50-m deep block of fractured monzonitic gneiss located at Chalk River, Ontario have been determined from surface and bore-hole investigations. Surface investigations including air photo lineament analysis, ground and airborne geophysics and fracture mapping were used to define the local and regional fracture system, locate the study site and direct the exploratory drilling program. Subsurface investigations were completed in 17 boreholes and included fracture logging, systematic straddle-packer injection testing, hydraulic interference testing and long-term hydraulic head monitoring. The interference tests and monitoring were conducted in 90 packer-isolated test intervals created by installation of multiple-packer casings in each borehole. Hydraulic interference tests provided detailed information on the equivalent single-fracture aperture and storativity of four major (? 50-m extent) fracture zones and the vertical hydraulic diffusivity of the rock mass of the study site. Fracture logs and injection test data were combined to generate a tensoral representation of hydraulic conductivity for each test interval. The results of the detailed investigations are presented and interpreted to provide a complete three-dimensional description of the groundwater flow system. A gravity-controlled flow system occurs at the Chalk River study site. Groundwater flow in the rock is primarily vertical to a low-hydraulic head, fracture zone at 33 to 50 m depth with a horizontal component of flow determined by surface topography. An impermeable diabase dyke and three additional high-permeability fracture zones are important hydrogeologic features influencing flow at the study site. The results of the investigations also show that characterization of the geometric and hydraulic properties of large structural discontinuities is essential in understanding the flow of fluids in fractured rocks

1986-01-01

234

Computer representation of electrical system interaction with hydraulic turbine and penstock  

Energy Technology Data Exchange (ETDEWEB)

In the design of a hydroelectric generating plant, the major engineering disciplines assume responsibility for various items of equipment. It is difficult to examine the dynamic relationships that may exist between the penstock, the turbine and governor, and the generator and electrical system. Computer models are available to represent hydraulic transient phenomena in detail, and separate detailed representations of the electrical system are also available. This paper discusses a computer modelling approach that uses a high level computer language to represent hydraulic effects, including water hammer, concurrently with a detailed representation of the turbine, generator, controls and the electrical system.

Coprington, J.B.; Faivey, H.T.; Harrison, M.; Periera, L.

1982-08-01

235

Method for gradually relieving pressure in a hydraulic system utilizing reverse fluid flow through a pump of the system  

UK PubMed Central (United Kingdom)

A method of gradually relieving pressure in a hydraulic system of a work machine, wherein a pump in fluid communication with the hydraulic system and a fluid reservoir, is operable for pressurizing fluid from the reservoir and pumping the pressurized fluid into the hydraulic system, wherein the pump is restrictive to fluid flow therethrough when not operating, and the hydraulic system includes at least one valve in fluid communication with the work element configured for receiving the pressurized fluid. The valve is controllably operable in at least two operating modes, including a first mode wherein the pressurized fluid can pass therethrough between the pump and the work element or elements, and a second mode wherein the fluid is prevented from passing between the pump and the work element.; The method includes operating the valve or valves in the first mode for at least a predetermined time period while the pump is not operating, to allow at least some of any of, the pressurized fluid in the work element to flow through the hydraulic system and gradually drain through the pump to the reservoir so as to reduce any pressure in the hydraulic system and the work element.

EHRHART PHILIP J; FACKLER ROBERT L

236

The study on measures to improve the reliability of the hydraulic systems of shearers  

Energy Technology Data Exchange (ETDEWEB)

The papers indicates that the failure of hydraulic systems of shearers can drop greatly and its reliability and service life can be increased by the use of a field oil contamination analyser and filter device to control the oil contamination of the hydraulic systems of shearers. Experimental provement of silting-theory contamination analyser are carried out. The filter effect of portable hydraulic driving oil-filter model YLJ-21 is examined in laboratory and field experiment. From January to August 1992, on-site experimental research using a silting-theory contamination analyser and oil-filter model YLJ-21 to control the oil contamination was carried out in the Datong Coal Mining Bureau. 2 refs., 5 tabs.

Yuan, H.; Xu, L.; Tian, D.; Zhao, Y. [China Coal Research Institute, Beijing (China). Beijing Research Institute of Mine Construction

2001-12-01

237

Power-efficient hydraulic systems. Volume 2. Hardware demonstration phase. Final report, October 1985-July 1988  

Energy Technology Data Exchange (ETDEWEB)

Energy-saving concepts for aircraft hydraulic systems were studied in a two-phase program. Task I was an investigation of methods and techniques to reduce overall hydraulic-system power requirements by lowering system demands and increasing component efficiencies. Task II involved hardware demonstration tests on selected concepts. Task I: Study phase. A baseline hydraulic system for an advanced aircraft design was established. Twenty energy-saving techniques were studied as candidates for application to the baseline vehicle. A global systems analysis approach was employed. The candidates were compared on the basis of total fuel consumption and six qualitative factors. Task II: Hardware demonstration phase. Two techniques demonstrated for energy savings were control valves with overlap and dual pressure-level systems. Tests were conducted on control valves, a servo actuator, dual pressure pumps, and a lightweight hydraulic system simulator. Valves with 0.002-in. overlap reduced system energy consumption 18% compared to using valves with zero lap. Operation at 4000 psi reduced system energy consumption 53% compared to operation at 8000 psi. Pressure-level switching was accomplished with excellent results.

Hupp, R.V.; Haning, R.K.

1988-07-01

238

Aircraft Hydraulic System Dynamic Analysis. Volume III. Frequency Response (HSFR) Computer Program User Manual.  

Science.gov (United States)

The hydraulic system frequency response (HSFR) computer program was developed to simulate the dynamic response of a hydraulic system to the acoustic noise generated by the pump. Detailed instructions for modeling the system pump, lines, and components, an...

G. Amies B. Greene

1977-01-01

239

Safety of 5 MW district heating reactor (DHR) and hydraulic dynamic pressure drive control rods  

International Nuclear Information System (INIS)

[en] The principles and movement characteristic of the hydraulic dynamic pressure drive for control rods in 5 MW district heating reactor are described with stress on analysis of its effects on reactor safety features. The drive is different from electric-magnetic drive for PWR or hydraulic drive for BWR. The drive cylinder is driven by dynamic pressure. In the new drive system, the reactor coolant (water) used as actuating medium is pressed by pump, then injected into a step cylinder which is set in the reactor core. The cylinder will move step by step by controlling flow, then the cylinder drives the neutron absorber and controls nuclear reaction. The drive is characterized by simplicity in structure, high reliability, inherent safety, reduction in reactor height, economy, etc

1991-01-01

240

HYDRAULIC SYSTEM FOR AGRICULTURAL TRACTORS, AND AGRICULTURAL TRACTOR  

UK PubMed Central (United Kingdom)

A hydraulic system for agricultural tractors, where the agricultural tractor can be associated operationally with an agricultural implement, includes at least one variable-discharge hydraulic pump (1) and a pressure sensor (2) which are associated operationally with each other. The pressure sensor (2) is capable of measuring the pressure load required by the agricultural implement. The variable-discharge pump (1) is configured so as to provide a determined discharge of oil to the agricultural implement, based upon at least one pressure load value measured by the pressure sensor (2).

PEREIRA VANDERLEI; AMARAL EDNALDO JOSE

 
 
 
 
241

Pneumatic and Hydraulic Systems in Coal Fluidized Bed Combustor  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Problem statement: This study designed the pneumatic and hydraulic systems in coal fluidized bed combustor. These are fluidization of silica sand bed material, Air distributor, centrifugal fan, electric motor power drive and surface heat exchanger. Approach: The effects of increased ga...

Z. O. Opafunso; I. I. Ozigis; I. A. Adetunde

242

Study on Knowledge -based Intelligent Fault Diagnosis of Hydraulic System  

Digital Repository Infrastructure Vision for European Research (DRIVER)

A general framework of hydraulic fault diagnosis system was studied. It consisted of equipment knowledge bases, real-time databases, fusion reasoning module, knowledge acquisition module and so on. A tree-structure model of fault knowledge was established. Fault nodes knowledge was encapsulated by o...

Xuexia Liu

243

Innovative hydraulic line-ups of heating systems  

Energy Technology Data Exchange (ETDEWEB)

The hydraulic line-up of piping systems installed in buildings (i.e. the reduction of excess pressure) requires a large number of data to be compiled and considered. Tables, diagrams and formulae give access to a relatively simple method developed for hydraulic line-up purposes. Reference is made to the quantity of circulating water (radiators, excess temperatures, energy demand calculations, systems temperatures, new systems, existing systems, water quantities, single-tube systems, other methods applied to determine water quantities), and to the determination of water quantities on the basis of space heat demands and radiator performances. The data given on pressure losses are dealt with in terms of heating system designs and water temperatures. (HWJ)

Soyer, J.

1987-05-01

244

WATER ENERGY IN HYDROAMELIORATIVE SYSTEMS USING THE HYDRAULIC TRANSFORMER TYPE A. BARGLAZAN AND THE HYDRAULIC HAMMER (HYDRAULIC PUMP)  

Directory of Open Access Journals (Sweden)

Full Text Available This paper presents two examples of exploitation of water energy that can be used in the irrigation field. First of theseexamples is the hydraulic transformer type A. Barglazan used for irrigation, pumped water is taken directly from theriver’s well, using a hydraulic pump which simultaneously carried out a double transformation in this way: hydraulicenergy into mechanic energy and mechanical energy into hydraulic energy. Technology preparation and devices designwas done in record time, seeing that this constructive solution is more robust, reliable and with improved energyperformance versus the laboratory prototype. The experimental research which was made at 1:1 scale proved theirgood function over time. Another example is the hydraulic hammer (hydraulic pump) that uses low-head energy topump water, with a global efficiency of about 10 - 50%. Currently, the new situation of private ownership of landprovides conditions for new pumping microstations to be made where irrigation is necessary and optimal hydrauliclocations exist.

Teodor Eugen Man; Laura Constantinescu; Dima Attila Blenesi

2010-01-01

245

Aircraft Hydraulic System Dynamic Analysis. Volume IV. Frequency Response (HSFR) Computer Program Technical Description.  

Science.gov (United States)

The hydraulic system frequency response (HSFR) computer program was developed to simulate the dynamic response of a hydraulic system to the acoustic noise generated by the pump. A detailed technical description of the program is presented. For a selected ...

G. Amies B. Greene

1977-01-01

246

Recurrent-neural-network-based identification of a cascade hydraulic actuator for closed-loop automotive power transmission control  

International Nuclear Information System (INIS)

By virtue of its ease of operation compared with its conventional manual counterpart, automatic transmissions are commonly used as automotive power transmission control system in today's passenger cars. In accordance with this trend, research efforts on closed-loop automatic transmission controls have been extensively carried out to improve ride quality and fuel economy. State-of-the-art power transmission control algorithms may have limitations in performance because they rely on the steady-state characteristics of the hydraulic actuator rather than fully exploit its dynamic characteristics. Since the ultimate viability of closed-loop power transmission control is dominated by precise pressure control at the level of hydraulic actuator, closed-loop control can potentially attain superior efficacy in case the hydraulic actuator can be easily incorporated into model-based observer/controller design. In this paper, we propose to use a recurrent neural network (RNN) to establish a nonlinear empirical model of a cascade hydraulic actuator in a passenger car automatic transmission, which has potential to be easily incorporated in designing observers and controllers. Experimental analysis is performed to grasp key system characteristics, based on which a nonlinear system identification procedure is carried out. Extensive experimental validation of the established model suggests that it has superb one-step-ahead prediction capability over appropriate frequency range, making it an attractive approach for model-based observer/controller design applications in automotive systems

2012-01-01

247

A stress sensor for the electronic control of hydraulic power-lifts fitted to agricultural tractors  

UK PubMed Central (United Kingdom)

A hydraulic power-lift (6) for the linkage (2) of implements (3) to a tractor (1) includes two arms (7) connected to the lower rods (4) of the linkage, a hydraulic operating unit (9) for operating the arms of the power-lift, and an electronic control unit for the hydraulic operating unit (10) connected to an extensometric detector (11) associated with the upper end of one of the pivoted control levers (12) normally used in conventional mechanical-hydraulic control devices for the linkage.

Bergese Claudio c/o Same S.p.A.; Hampel Gerard c/o Same S.p.A.

248

Analysis and selection of a system for hydraulic transport of slags in the Mironovskii power plant  

Energy Technology Data Exchange (ETDEWEB)

Discusses systems for hydraulic transport of ashes and slags from combustion of black coal (with an ash content of 40.5%) in the Mironovskii power plant. Three systems are comparatively evaluated: hydraulic transport under influence of gravity, hydraulic transport with a system of dredging pumps, or an airlift pump system. Design of each system, its operation and types of pumps or airlift systems are discussed. The evaluation concentrates on the hydraulic transport system with 1 to 3 airlift pumps each with a capacity ranging from 110 to 890 m{sup 3}/h. Optimum design of the airlift hydraulic system for slag and ash transport is described.

Mirgorodskii, V.G.; Mova, M.E.; Korenev, V.E.; Grechikhin, Yu.A. (Donetskii Politekhnicheskii Institut (USSR))

1991-01-01

249

SP-100 control system modeling  

Science.gov (United States)

SP-100 Control Systems modeling was done using a thermal hydraulic transient analysis model called ARIES-S. The ARIES-S Computer Simulation provides a basis for design, integration and analysis of the reactor including the control and protection systems. It is a modular digital computer simulation written in FORTRAN that operates interactively in real time on a VAX minicomputer.

Meyer, R. A.; Halfen, F. J.; Alley, A. D.

250

Mathematical modelling of hydraulic conditions of balancing and control of heating, cooling and dehumidification subsystem in ventilation and air conditioning systems  

Directory of Open Access Journals (Sweden)

Full Text Available The goal of these investigations is modeling of processes and studying of influence of quantitative characteristics and parameters in heating and cooling subsystem of ventilation and air conditioning systems at balancing this subsystem by means of various balancing valves and control of three-running valve. Balancing and management processes are considered on an example of the binding water air-heater of ventilation and air conditioning system. Besides, influence of various regime parameters on considered balancing characteristics is studied, as that: difference of pressure in a network of a heat supply, the pressure created by the pump, their parity, various water temperatures, the modes leading to self-oscillations. Result of work is reception of balancing and adjusting characteristics of a considered subsystem in most general view under various working conditions and their further analysis.

A.G. Sotnikov; A.P. Rusakov

2011-01-01

251

On-Board Hydraulic System Monitor Study.  

Science.gov (United States)

The purpose of the Oklahoma State University/U.S. Army Mobility Equipment Research and Development Center Program is to provide the military with tools for the scientific appraisal of fluid power systems. The activities of the second year of the systems p...

1974-01-01

252

Engine having a high pressure hydraulic system and low pressure lubricating system  

Energy Technology Data Exchange (ETDEWEB)

An engine includes a high pressure hydraulic system having a high pressure pump and at least one hydraulically-actuated device attached to an engine housing. A low pressure engine lubricating system is attached to the engine housing and includes a circulation conduit fluidly connected to an outlet from the high pressure pump.

Bartley, B.E.; Blass, J.R.; Gibson, D.H.

2000-05-30

253

Engine having a high pressure hydraulic system and low pressure lubricating system  

Science.gov (United States)

An engine includes a high pressure hydraulic system having a high pressure pump and at least one hydraulically-actuated device attached to an engine housing. A low pressure engine lubricating system is attached to the engine housing and includes a circulation conduit fluidly connected to an outlet from the high pressure pump.

Bartley, Bradley E. (Manito, IL); Blass, James R. (Bloomington, IL); Gibson, Dennis H. (Chillicothe, IL)

2000-01-01

254

The Integration of an Electro-hydraulic Manipulator Arm into a Self-contained Mobile Delivery System  

Energy Technology Data Exchange (ETDEWEB)

The Portable Articulated Arm Deployment System (PAADS) is a remotely controlled vehicle for delivering a tele-operated electro-hydraulic manipulator arm to a field deployable location. The self-contained system includes a boom vehicle with long reach capability, an electro-hydraulic manipulator arm, closed circuit television (CCTV) systems, and onboard tools. On board power systems consist of a self contained, propane fired 8 KW generator and an air compressor for pneumatic tools. The generator provides the power to run the air compressor as well as provide power to operate the 110 VAC auxiliary lighting system for the video cameras. The separate control console can be located up to 500 ft from the vehicle. PAADS is a fully integrated system, containing all equipment required to perform complex field operations. Hydraulic integration of the manipulator arm into the vehicle hydraulic drive system was necessary to eliminate the tether management of hoses, which extended vehicle operating range, minimized hydraulic pressure losses, and provided the opportunity to go to a radio frequency (RF) control system in the future, thereby eliminating the control cable. This paper presents the key decision points during system development. Emphasis is placed on ease of operator control and not on an intelligent machine approach. In addition, emphasis is placed on the philosophy of remote operation based on sound principles on integration.

Borland, Mark Wilson; Berry, Stephen Michael

1999-04-01

255

The Integration of an Electro-Hydraulic Manipulator Arm into a Self-Contained Mobile Delivery System  

Energy Technology Data Exchange (ETDEWEB)

The Portable Articulated Arm Deployment System (PAADS) is a remotely controlled vehicle for delivering a tele-operated electro-hydraulic manipulator arm to a field-deployable location. The self-contained system includes a boom vehicle with long reach capability, an electro-hydraulic manipulator arm, closed circuit television (CCTV) systems, and onboard tools. On board power systems consist of a self-contained, propane-fired 8-KW generator and an air compressor for pneumatic tools. The generator provides the power to run the air compressor as well as power to operate the 110-VAC auxiliary lighting system for the video cameras. The separate control console can be located up to 500 ft from the vehicle. PAADS is a fully integrated system, containing all equipment required to perform complex field operations. Hydraulic integration of the manipulator arm into the vehicle hydraulic drive system was necessary to eliminate the tether management of hoses, which extended vehicle operating range, minimized hydraulic pressure losses, and provided the opportunity to go to a radio frequency (RF) control system in the future, thereby eliminating the control cable. This paper presents the key decision points during system development. Emphasis is placed on ease of operator control and not on an intelligent machine approach. In addition, emphasis is placed on the philosophy of remote operation based on sound principles of integration.

M. Borland; S. M. Berry

1999-04-01

256

Hydraulic Yaw System for Wind Turbines with New Compact Hydraulic Motor Principle  

DEFF Research Database (Denmark)

This paper presents a new hydraulic yaw system for wind turbines. The basic component is a new type of hydraulic motor characterized by an extraordinary high specific displacement yielding high output torque in a compact form. The focus in the paper is the volumetric efficiency of the motor, which is based on leakage flow. The most critical gaps in the motor, across the end faces of the rotor, are investigated both by a fluid structural interaction simulation model and by experimental prototype tests. The simulation model is the basis for the motor design and the manufacturing tolerances. The volumetric efficiency is highly dependent on the structural deflections caused by the pressure distribution in the fluid films across the rotor. This gap height is measured with a 0.1?m resolution "SMAC Moving Coil Actuator" in the experimental test setup. When the pressure in the pressure compensation volumes is minimizing the deflections, the measured gap height is around ? = 10?m and the volumetric efficiency of the motor is around ?v = 0.85. By decreasing the initial gaps from the manufacturing process, this volumetric efficiency can be further increased.

SØrensen, Rasmus MØrk; Hansen, Michael Rygaard

2011-01-01

257

Transputers in Fluid Power - Design and Applications. Chapter 5 in Advances in Hydraulic Control Systems. : A SERG Publication - SERG: Subsea Engineering Research Group.  

DEFF Research Database (Denmark)

Deals with results and trends on mechatronics in fluid power and intelligent control of machines and robots. New results are presented concerning transputer-basen distributed control of machines and robots. Experimental results with the DTU mechatronic test facility are presented and discussed. Several adaptive control algoritms are investigated and evaluated. Promissing results are obtained with Computed Valve-Input Control (CIC), Adaptive Model-based Actuator Control (AMAC) and Linear Pertubation Adaptive Control (LPAC).

Conrad, Finn

1996-01-01

258

MERADCOM/OSU Hydraulic System Reliability Program.  

Science.gov (United States)

The purpose of the Oklahoma State University/U.S. Army Mobility Equipment Research and Development Command Program is to provide the military with tools for the scientific appraisal of fluid power systems. Section I presents a detailed account of the proj...

1979-01-01

259

1B hydraulic system: Sydney Coalfield, Glace Bay, Nova Scotia  

Energy Technology Data Exchange (ETDEWEB)

The paper uses diagrams and maps to show the 1B hydraulic system of the Sydney coal field and the sequence of coal seams (Hub, Harbour, Phalen, and Emery seams) at Donkin Mine. The water elevation (feet below sea level) in the 1B hydraulic system over the period March 1986 to May 2005 is shown on a graph. Data on pH, sulphates, and iron and other metallic contaminants at the No. 5 colliery well field are tabulated for October 2002 and January 2003. Graphs show the half-life projections for the decay of iron 1A water over the period 2003 to 2058 and the concentration of iron predicted for 1A water and other Glace Bay outfalls to 2117. 44 figs., 1 tab.

Forgeron, S. [Conestoga-Rovers & Associates, Fredericton, NB (Canada)

2006-10-15

260

Thermal-hydraulic tests for reactor safety system  

International Nuclear Information System (INIS)

[en] Tests for the safety depressurization system, Sparger adopted for the Korean next generation reactor, APR1400 are carried out for several geometries with the B and C (Blowdown and Condensation) facility in the condition of high temperature and pressure and with a small test facility in the condition of atmospheric temperature and pressure. Tests for the critical heat flux are performed with the RCS(Reactor Coolant System) facility as well as with the Freon CHF Loop in the condition of high temperature and pressure. The atmospheric temperature and pressure facility is utilized for development of the high standard thermal hydraulic measurement technology. The optical method is developed to measure the local thermal-hydraulic behavior for the single and two-phase boiling phenomena

2002-01-01

 
 
 
 
261

Automatic control systems for powered supports  

Energy Technology Data Exchange (ETDEWEB)

Two automatic control systems for powered supports are outlined. The first, an all-hydraulic system, allows both manual operation and rotary valve based automatic operation of the supports. Automatic operation can be either batch type, in which a number of supports are operated simultaneously, or sequential, with no limitation on the number of supports. In both operating modes, however, the hydraulic circuits are complicated and the operator is positioned downwind of the site of dust generation. The second control system utilizes electric control valves in addition to hydraulic valves. The hydraulic circuits are simple in comparison with the all-hydraulic system, the operator can position himself freely, and in general, workability is superior. (In Japanese)

Okazaki, N.

1983-09-01

262

Thermal hydraulic tests for reactor safety system -Research on the improvement of nuclear safety-  

International Nuclear Information System (INIS)

[en] The present research aims at the development of the thermal hydraulic verification test technology for the reactor safety system of the conventional and advanced nuclear power plant and the development of the advanced thermal hydraulic measuring techniques. (Author)

1994-01-01

263

THERMAL HYDRAULIC ANALYSIS OF A GAS TEST LOOP SYSTEM  

Energy Technology Data Exchange (ETDEWEB)

This paper discusses thermal hydraulic calculations for a Gas Test Loop (GTL) system designed to provide a high intensity fast-flux irradiation environment for testing fuels and materials for advanced concept nuclear reactors. To assess the performance of candidate reactor fuels, these fuels must be irradiated under actual fast reactor flux conditions and operating environments, preferably in an existing irradiation facility [1]. Potential users of the GTL include the Generation IV Reactor Program, the Advanced Fuel Cycle Initiative and Space Nuclear Programs.

Donna Post Guillen; James E. Fisher

2005-11-01

264

Evaluation of Bulk Modulus of Oil System with Hydraulic Line  

Science.gov (United States)

The aim of the paper is to experimentally measure and ealuate bulk modulus of oil/steel pipe system and oil/hose system. The measurement was performed using experimental device on the basis of a measured pressure difference depending on time. Bulk modulus is evaluated from pressure change with known flow and volume of line. Pressure rise is caused by valve closure at the line end. Furthermore, a mathematical model of the experimental device is created using Matlab SimHydraulics software. Time dependencies of pressure for the oil/steel pipe system and the oil/hose system are simulated on this mathematical model. The simulations are verified by experiment.

Hružík, L.; Vašina, M.; Bure?ek, A.

2013-04-01

265

Hydraulic tests of emergency cooling system: L-Area  

International Nuclear Information System (INIS)

The delay in L-Area startup provided an opportunity to obtain valuable data on the Emergency Cooling System (ECS) which will permit reactor operation at the highest safe power level. ECS flow is a major input to the FLOOD code which calculates reactor ECS power limits. The FLOOD code assesses the effectiveness of the ECS cooling capacity by modeling the core and plenum hydraulics under accident conditions. Presently, reactor power is not limited by the ECS cooling capacity (power limit). However, the manual calculations of ECS flows had been recently updated to include piping changes (debris strainer, valve changes, pressure release systems) and update fitting losses. Both updates resulted in reduced calculated ECS flows. Upon completion of the current program to update, validate, and document, reactor power may be limited under certain situations by ECS cooling capacity for some present reactor charge designs. A series of special hydraulic tests (Reference 1, 3) were conducted in L-Area using all sources of emergency coolant including the ECS pumps (Reference 2). The tests provided empirical hydraulic data on the ECS piping. These data will be used in computer models of the system as well as manual calculations of ECS flows. The improved modeling and accuracy of the flow calculations will permit reactor operation at the highest safe power level with respect to an ECS power limit

1988-01-01

266

Hydraulic tests of emergency cooling system: L-Area  

Energy Technology Data Exchange (ETDEWEB)

The delay in L-Area startup provided an opportunity to obtain valuable data on the Emergency Cooling System (ECS) which will permit reactor operation at the highest safe power level. ECS flow is a major input to the FLOOD code which calculates reactor ECS power limits. The FLOOD code assesses the effectiveness of the ECS cooling capacity by modeling the core and plenum hydraulics under accident conditions. Presently, reactor power is not limited by the ECS cooling capacity (power limit). However, the manual calculations of ECS flows had been recently updated to include piping changes (debris strainer, valve changes, pressure release systems) and update fitting losses. Both updates resulted in reduced calculated ECS flows. Upon completion of the current program to update, validate, and document, reactor power may be limited under certain situations by ECS cooling capacity for some present reactor charge designs. A series of special hydraulic tests (Reference 1, 3) were conducted in L-Area using all sources of emergency coolant including the ECS pumps (Reference 2). The tests provided empirical hydraulic data on the ECS piping. These data will be used in computer models of the system as well as manual calculations of ECS flows. The improved modeling and accuracy of the flow calculations will permit reactor operation at the highest safe power level with respect to an ECS power limit.

Hinton, J H

1988-01-01

267

Engine having hydraulic and fan drive systems using a single high pressure pump  

Energy Technology Data Exchange (ETDEWEB)

An engine comprises a hydraulic system attached to an engine housing that includes a high pressure pump and a hydraulic fluid flowing through at least one passageway. A fan drive system is also attached to the engine housing and includes a hydraulic motor and a fan which can move air over the engine. The hydraulic motor includes an inlet fluidly connected to the at least one passageway.

Bartley, Bradley E. (Manito, IL); Blass, James R. (Bloomington, IL); Gibson, Dennis H. (Chillicothe, IL)

2000-01-01

268

Experimental-based Modelling and Simulation of Water Hydraulic Mechatronics Test Facilities for Motion Control and Operation in Environmental Sensitive Applications` Areas  

DEFF Research Database (Denmark)

The paper presents experimental-based modelling, simulation, analysis and design of water hydraulic actuators for motion control of machines, lifts, cranes and robots. The contributions includes results from on-going research projects on fluid power and mechatronics based on tap water hydraulic proportional valves and servo actuators for motion control and power transmission undertaken in co-operation by Technical University, DTU and Cracow University of Technology, CUT. The results of this research co-operation include engineering design and test of simulation models compared with two mechatronic test rig facilities powered by environmental friendly water hydraulic servo actuator system. Test rigs with measurement and data acquisition system were designed and build up with tap water hydraulic components of the Danfoss Nessie® product family. This paper presents selected experimental and identifying test results for a water hydraulic system.

Conrad, Finn; Pobedza, J.

2003-01-01

269

A "low-cost" hydraulic system to assure constant (rain) intensity produced by rainfall simulators  

Science.gov (United States)

Rainfall simulators are used to produce artificial rainfall both in the laboratory and in the field, and are particularly useful in soil erosion and surface hydrology studies. Although permitting a controllable, reliable and predictable simulation of rainfall events, rainfall simulators cannot replicate the unpredictable variability of natural rainfall. However, they provide a helpful tool to study the rainfall-runoff process at small scales. The aim of any rainfall simulator is the collection of accurate and useful data. However, better simulators will allow attaining data that is more accurate, thus leading to more consistent and useful models or to a better visualization and understanding of the physical processes. This study describes a hydraulic system to be attached to the nozzle of a rainfall simulator in order to eliminate pressure fluctuations, even if water supply pressure fluctuates. The hydraulic system consists of a chamber with steady pressure which supplies the nozzle, achieved by combining a pressure reduction valve after the water intake and a headloss valve before the outflow hose, thus ensuring a constant pressure level (and so a constant rainfall intensity) throughout each rainfall event. This hydraulic system was developed at the Laboratory of Hydraulics, Water Resources and Environment of the Department of Civil Engineering of the University of Coimbra. The system's ability to control the rainfall intensity is demonstrated by carrying out a set of laboratory rainfall simulations. In these simulations, high precision pressure transducers were used to measure, at a rate of 0.01s, the pressure at the water supply intake and at the nozzle. The results show that, with this hydraulic system, rainfall simulators can operate with constant (rainfall) intensity during the entire simulations.

Isidoro, Jorge; de Lima, João

2013-04-01

270

Renovation of RELAP5 as thermal-hydraulic system code for simulator in Nuclear Power Plant  

International Nuclear Information System (INIS)

Original RELAP5 is a non-real-time code, and has limitation on the data communication and calculation process control, so it is not very suitable for simulator. A new thermal-hydraulic system code for simulator, RELAPSIM, has been developed by employing RELAP5 at NSSE. The course of development consists of three major parts. Firstly, the time control function has been added into the code to meet the requirement of real-time calculation. Secondly, the function of controlled dynamic data communication was improved, thus thermal-hydraulic parameters can be exported from the code and can be input and modified by commands. Finally, the function of calculation process control was embedded in RELAP5 code, which provides the full ability to fulfill the multiple operations, such as starting up, shutting down, freezing, running, snapshoting, and resetting. This paper presents the development activities and the results of assessment by using RELAP5 and RELAPSIM. (author)

2005-01-01

271

Special hydraulic tests of emergency cooling system, L-Area  

Energy Technology Data Exchange (ETDEWEB)

The delay in the L-Area startup provides an opportunity to obtain valuable data on the emergency cooling system (ECS). A series of special hydraulic tests of the ECS are proposed for L-Area. These tests are in addition to the test proposed by SRL. The tests will provide much needed empirical hydraulic data on the ECS piping for incorporation in computer models as well as improve the accuracy of manual calculations. The improved modeling and accuracy will permit reactor operation at the highest safe power level with respect to an ECS power limit. The magnetic flow meters in the ECS supply piping will allow rapid and accurate data collection. No special test equipment will be required. Only standard pressure and differential pressure instruments will be required in addition to the in-line flowmeters.

Merz, G.F.

1985-05-06

272

OPTIMIZING THE HYDRAULIC SYSTEMS USING THE SIMHYDRAULICS PROGRAMMING ENVIRONMENT  

Directory of Open Access Journals (Sweden)

Full Text Available This paper analyzes the simulation of a hydrostatic system using the Simhydraulics programme of the Matlab programming environment. The author intention is to underline the advantages of this programme offers in performing the functional tests of the complex hydraulic systems. The form of the characteristics resulting after the simulation indicates the precision of the model created and subsequently allows the choice of the optimum functional parameters. Using some specialized software, making models and simulations which can be realized using them, are necessary steps in the modern projecting of a hydrostatic system. The advantages in terms of time and costs offered by this method are also underlined here.

PASCU MARIUS

2010-01-01

273

Control setting equipment for hydraulic props and hydraulically controlled non-return valve. Nachsetzsteuerung fuer einen hydraulischen Stempelausbau sowie hydraulisch ansteuerbares Rueckschlagventil  

Energy Technology Data Exchange (ETDEWEB)

The invention concerns a control setting equipment for hydraulic props with a pressure controlled setting valve, which connects the prop automatically to the pressure pipe at a given pressure, which is lower than the given prop pressure and higher than the value of pressure for the free prop. In order to increase the safety of the setting control and especially to avoid faults on the hydraulic prop during working of the mine, if a pressure is built up in the return when moving the prop, when the setting valve opens, according to the invention a blocking device is provided, which automatically locks the automatic setting when switching over the control valve device to the ''move'' position. The blocking device preferably consists of a hydraulically operated valve, particularly the setting valve, whose actuating piston has the pressure in the pressurized pipe supplied to it via a control pipe.

Demircan, B.; Kussel, W.

1983-02-03

274

Control system for automatic transmissions for vehicles  

Energy Technology Data Exchange (ETDEWEB)

This patent describes a control system for an automatic transmission for a vehicle with a vehicle speed detector providing an electrical vehicle speed signal and a hydraulic pressure source for supplying a predetermined hydraulic pressure. The automatic transmission includes a hydraulic torque converter, an input and an output shaft. It also includes: a signal processing circuit for processing the electrical vehicle speed signal and generating an electrical control signal; an electro-magnetic valve interposed between the hydraulic pressure source and the torque converter for converting the predetermined hydraulic pressure into levels in response to the control signal to produce the control pressure; and a coupling for providing a direct mechanical-coupling between the input and output shafts in response to the control pressure and with the degree of coupling in proportion to the magnitude of the pressure.

Nishikawa, M.; Sakai, S.; Aoki, T.

1986-02-18

275

HYDRAULIC SHOCK DISSIPATION FOR IMPLEMENT BOUNCE  

UK PubMed Central (United Kingdom)

To dissipate hydraulic shock created by the bouncing of an implement mounted on a wheeled vehicle, such as a towed tillage implement or the bucket of a vehicle, such as a wheel loader, an electronic control valve, which supplies hydraulic fluid to the hydraulic actuator that raises and lowers the implement, is actively controlled by an electronic controller. As the vehicle with an implement is transported at higher speeds, the implement tends to bounce creating pressure spikes in the hydraulic system that raises and lowers the implement. The pressure spikes are dissipated by actively generating random or cancelling hydraulic pulses in the hydraulic system.

SMITH KEVIN M; POSSELIUS JOHN H

276

Hydraulic controls on glacier and ice cap flow  

Science.gov (United States)

The supply of surface meltwater to the beds of glaciers and ice caps can have a profound impact on their flow. This is a key ingredient in assessing how the dynamics of glaciers will change under a warming in climate, which will often lead to longer melt seasons and more intense surface water input to the bed. Classical glacier hydraulics theory suggests that high water supply rates should be associated with the formation of an efficient, channelized drainage system at low water pressure, and consequently with slow ice flow. Direct observations paint a much more complicated picture, with significant spatial and temporal variations in subglacial water pressure and surface velocity. Here we show how spatially extended models for drainage through a system of connected cavities and channels can describe a wide range of responses to surface water input. After a 'spring event' transient early in the melt season, channelization driven by an increase in water input can indeed lead to slow-down, but whether this occurs crucially depends on four factors: i) the relative magnitude of background water flow to seasonal surface water supply ii) how concentrated surface water supply is trough discrete moulins iii) the temporal variability of water input, iv) the capacity of the drainage system to store water. Contrary to classical notions, we find that concentrated, highly temporally variable water input typically leads to significant localized speed-up (when averaged over diurnal cycles), especially when background water supply is small. We also show that the storage capacity of the drainage system plays a crucial role in damping the magnitude and spatial extent of this speed-up, in particular in more extensive drainage systems such as those expected to form under ice caps.

Schoof, C.; Hewitt, I. J.

2012-04-01

277

Contested hydrohegemony: Hydraulic control and security in Turkey  

Directory of Open Access Journals (Sweden)

Full Text Available The article seeks to expand the understanding of the emerging concept of hydrohegemony (Zeitoun and Warner, 2006). Illustrated by Turkey’s strategy with respect to the Euphrates-Tigris it looks at the layered nature of water-related political strategies at different levels. The article therefore introduces hegemony as a layered phenomenon whose multi-level interactions impinge on each other. It zooms in on Turkish hegemony in its hydraulic control and security strategies, and the international repercussions of that strategy.The present analysis suggests that Turkey’s basin and regional hegemony is contested and constrained from different sides, not least at home. Its water projects are a flashpoint of domestic, basin as well as global politics. It argues that the need to access capital in the international market to realise these ambitions necessitated a 'passive revolution' in Turkey which opened a window of opportunity utilized by the internationalised counter-hegemonic moves against Turkey’s dam projects in Southeast Anatolia, notably the ongoing Ilisu dam on the Tigris.

Jeroen Warner

2008-01-01

278

Boiler corrosion can be prevented. Requirements on hydraulics and control in heat generators. Korrosionsschaeden am Heizkessel lassen sich vermeiden. Anforderungen an Hydraulik und Regelung von seiten der Waermeerzeuger  

Energy Technology Data Exchange (ETDEWEB)

Heating boilers are classified according to DIN 4702, parts 1 to 8. Specific requirements concerning hydraulics and control are made especially on heating boilers with a rated capacity of more than 100 kW. High-efficiency boilers and low-temperature boilers below 100 kW usually make hardly any demand on the hydraulics of the heating system (owing to the fact that they have no lower limiting temperature and may be operated if necessary with the aid of heating agent flows without any upper or lower limit); hydraulics and control in large heating boilers must be in accordance with the producer's specifications on temperatures and heating agent flow. The new VDI 2073 - hydraulic circuits of HVAC systems - which will be published soon, will contain important hints for the hydraulic connection of one or several boilers to the heating grid. (BR).

Schlapmann, D. (Buderus Heiztechnik GmbH, Lollar (Germany, F.R.). Entwicklung Lollar)

1989-09-01

279

The simulation of hydraulic controllable shut-off valve based on dynamic mesh technology  

Science.gov (United States)

The drainage system of mine has strict requirement to its equipments for the special work environment of the mine. The controllability of the shut-off valve is a key in the automatic drainage system. This paper presented the design scheme of the controllable shut-off valve according to the real condition of drainage system in mine. The paper built geometric model and mathematic model of the hydraulic controllable shut-off valve by using FLUENT dynamic mesh technology, and carried on the numerical simulation to its internal flow field, and analyzed the analog result. From the analysis results, it can see that, when the valve's closure or open velocity is bigger than 0.01 m/s, the phenomenon of pressure fluctuation and the water hammer would occur easily.

Wu, Juan; Kou, Ziming

2008-11-01

280

Developing a Tool Point Control Scheme for a Hydraulic Crane Using Interactive Real-time Dynamic Simulation  

DEFF Research Database (Denmark)

This paper describes the implementation of an interactive real-time dynamic simulation model of a hydraulic crane. The user input to the model is given continuously via joystick and output is presented continuously in a 3D animation. Using this simulation model, a tool point control scheme is developed for the specific crane, considering the saturation phenomena of the system and practical implementation.

Pedersen, Mikkel Melters; Hansen, Michael Rygaard

2010-01-01

 
 
 
 
281

Hydraulic transient analysis in circulating water pump system  

International Nuclear Information System (INIS)

[en] The present paper has dealt with the various phenomena associated with the hydraulic transient operation of pump system following the interruption of flow from its steady state with a special reference on the classical sloshing phenomena. The phenomena often encountered in the piping network following the separation of liquid column and the formation of cavity inside the pipe results in reverse transient pressure built up upon subsequent rejoining of separated liquid columns. A computer programme has been developed to predict the transient behaviour of circulating water (CW) pump system considering the various hydrodynamic phenomena involved in the process. (author). 2 refs., 12 figs

1994-01-01

282

Thermal-hydraulics of lead bismuth for accelerator driven systems  

International Nuclear Information System (INIS)

[en] Full text of publication follows: Lead bismuth has been selected as one of the most suitable coolants to be used in accelerator driven systems (ADS) for transmutation of minor actinides. It serves both, as a target material of the spallation source to balance the neutron economy, and as a coolant with high thermal inertia to provide a safe and reliable heat transfer to the secondary power cycle. With the aim to develop the required technologies to enable the later design of such ADS systems, the Karlsruhe Lead bismuth LAboratory KALLA, consisting of three test loops, has been built and set into operation at the Forschungszentrum Karlsruhe since 2000, keeping more than 45 t of PbBi in operation at temperatures up to 550 deg. C. The test program includes oxygen control systems, heat flux simulation tools, electro-magnetic and mechanical pump technologies, heat transfer and flow measurements, reliability and corrosion tests. In a first test campaign, a technology loop called THESYS was built to develop measurement technologies for the acquisition of scalar quantities, like pressures, temperatures, concentrations, and flow rates, as well as velocity fields, which are required for both operational and scientific purposes. THESYS also allowed to perform generic turbulent heat transfer experiments necessary to provide liquid metal adapted turbulent heat transfer models for ADS design analyses. The second loop, the thermalhydraulic loop THEADES with an installed power of 2.5 MW, has been built to conduct prototypical component experiments for beam windows (e.g. MEGAPIE or MYHRRA) or fuel rod configurations. First test results will be reported. The experimental team is supported by a numerical team who studied the thermal hydraulics of the tested components in order to enable a later transfer of the results to industrial systems. Three different types of codes are being improved: lumped parameter codes (e.g. ATHLET) to perform system analyses for lead bismuth in loops, targets, pumps and heat exchangers, CFD codes (e.g. CFX) to analyse local phenomena in thermally highly loaded components, and sub-channel codes (e.g. MATRA) to be used later for fuel assembly design. Heat transfer correlations and turbulence models were checked against measured data for validation. In addition, a direct numerical simulation of selected cases could provide further insight into the nature of turbulence in liquid lead bismuth. The paper is intended to give an overview of the numerous results achieved up to now. (authors)

2005-01-01

283

Logic Threshold Based Energy Control Strategy for Parallel Hydraulic Hybrid Vehicles  

Directory of Open Access Journals (Sweden)

Full Text Available To improve the performance of a Parallel Hydraulic Hybrid Vehicle (PHHV), the operation of components in the hydraulic hybrid system of the vehicle should be well coordinated. This study introduces an energy control strategy based on the logic threshold methodology for PHHVs. The energy distribution of the PHHV can be controlled in real-time and the operation modes of the PHHV can be changed dynamically by means of this energy control strategy. A simulation model for the analysis of the whole vehicle dynamic performance is developed using the Simulink in MATLAB. The multi-objective Genetic Algorithm (GA) optimization method is employed to get the optimal working modes, the best energy distribution in different drive cycles and the optimal parameters of the control strategy. In this optimization, maximum fuel economy is the objective and the difference of engine optimal torque and active pressure torque and the pressure limit are the variables of the GA optimization. The simulation results show that the fuel economy of the PHHV can be improved and in addition, the dynamic performance of the vehicle can be enhanced with the proposed energy control strategy.

Liu-Tao; Zheng-Jincheng; Wang-Shuwen; Gu-Fangde

2013-01-01

284

Hydraulic characterisation of karst systems with man-made tracers  

International Nuclear Information System (INIS)

Tracer experiments using man-made tracers are common in hydrogeological exploration of groundwater aquifers in karst systems. In the present investigation, a convection-dispersion model (multidispersion model with consideration of several flow paths) and a single-cleft model (consideration of the diffusion between the cleft and the surrounding rock matrix) were used for evaluating tracer experiments in the main hydrological system of the saturated zone of karst systems. In addition to these extended analytical solutions, a numerical transport model was developed for investigating the influence of the transient flow rate on the flow and transport parameters. Comparative evaluations of the model approaches for the evaluation of tracer experiments were made in four different karst systems: Danube-Aach, Paderborn, Slowenia and Lurbach, of which the Danube-Aach system was considered as the most important. The investigation also comprised three supplementary experiments in order to enable a complete hydraulic characterisation of the system. (orig./SR)

1998-01-01

285

Vehicle which can be steered, with electric battery drive and hydraulic system. Lenkbares Fahrzeug mit batterie-elektrischem Antrieb und hydraulischer Anlage  

Energy Technology Data Exchange (ETDEWEB)

The invention concerns a hydraulic system for a vehicle which can be steered and is driven by a battery, whose steering has a hydraulic servo steering amplifier device. This system consists of 2 electric motor-hydraulic pump units. A priority valve controls the switch-on conditions of both of these units, depending on their requirements for use in the hydraulic or the steering area. The invention is characterized by the fact that these two electric motor-pump units are of different sizes. The consumption of electrical energy per operation is considerably reduced in this way, and the working period per battery charge is thus considerably increased.

1984-04-26

286

Control system for an infinitely variable transmission  

Energy Technology Data Exchange (ETDEWEB)

This patent describes a control system for an infinitely variable transmission for transmitting the power of an internal combustion engine mounted on a vehicle. The transmission comprises: a primary pulley operatively connected to a crankshaft of the engine having a hydraulically shiftable disc and a first hydraulic cylinder for shifting the disc; a secondary pulley operatively connected to an output shaft and having a hydraulically shiftable disc and a second hydraulic cylinder for operating the disc of the secondary pulley; a belt engaged with both pulleys; a first hydraulic circuit having a pump for supplying oil; a transmission ratio control valve responsive to engine speed for controlling the oil so as to shift the disc of the primary pulley to change the transmission ratio; and a pressure regulator valve responsive to the transmission ratio for increasing line pressure of the hydraulic circuit with an increase of the transmission ratio. The improvement is described comprising: means comprising a piston axially slidably mounted in the first hydraulic cylinder of the primary pulley defining a piston chamber in the first hydraulic cylinder. The means is included for restricting shifting of the disc of the primary pulley to a maximum transmission ratio of the transmission so as to limit movement of the disc of the primary pulley at a restricted position where the transmission ratio is lower than the maximum transmission ratio of the transmission; and a second hydraulic circuit provided between the pump and the piston chamber.

Miyawaki, M.

1987-04-14

287

Nonlinear Adaptive Robust Control of Hydraulic Actuators Regulated by Proportional Directional Control Valves with Deadband and Nonlinear Flow Gains  

UK PubMed Central (United Kingdom)

This paper studies the motion control of single-rod hydraulicactuators regulated by proportional directional control(PDC)valves with deadband and nonlinear flow gains. The boommotion control of a hydraulic robot arm driven by a singlerodhydraulic actuator is used as a case study. The experimentalsystem dynamics are highly nonlinear. In addition,the system has large extent of modeling uncertainties suchas the variation of payload and friction forces. Furthermore,the PDC valve used to regulate the control flow rate to thehydraulic actuator has a large extent of deadband and a verynonlinear flow gain coefficient right out of the deadband region.These issues make the precision control of such a systemdifficult. To deal with these issues, the paper presentsa discontinuous projection based adaptive robust controller.Direct inverse is used to compensate for the effect of thevalve deadband, and certain straight-line approximations areused to model the nonlinear flow gain coeffi...

Fanping Bu; Bin Yao

288

Linear hydraulic drive system for a Stirling engine  

Energy Technology Data Exchange (ETDEWEB)

A hydraulic drive system operating from the periodic pressure wave produced by a Stirling engine along a first axis thereof and effecting transfer of power from the Stirling engine to a load apparatus therefor and wherein the movable, or working member of the load apparatus is reciprocatingly driven along an axis substantially at right angles to the first axis to achieve an arrangement of a Stirling engine and load apparatus assembly which is much shorter and the components of the load apparatus more readily accessible.

Walsh, Michael M. (Schenectady, NY)

1984-02-21

289

Study on Knowledge -based Intelligent Fault Diagnosis of Hydraulic System  

Directory of Open Access Journals (Sweden)

Full Text Available A general framework of hydraulic fault diagnosis system was studied. It consisted of equipment knowledge bases, real-time databases, fusion reasoning module, knowledge acquisition module and so on. A tree-structure model of fault knowledge was established. Fault nodes knowledge was encapsulated by object-oriented technique. Complete knowledge bases were made including fault bases and diagnosis bases. It could describe the fault positions, the structure of fault, cause-symptom relationships, diagnosis principles and other knowledge. Taking the fault of left and right lifting oil cylinder out of sync for example, the diagnostic results show that the methods were effective.

Xuexia Liu

2012-01-01

290

An adaptive fuzzy dead-zone compensation scheme and its application to electro-hydraulic systems  

Directory of Open Access Journals (Sweden)

Full Text Available The dead-zone is one of the most common hard nonlinearities in industrial actuators and its presence may drastically compromise control systems stability and performance. Due to the possibility to express specialist knowledge in an algorithmic manner, fuzzy logic has been largely employed in the last decades to both control and identification of uncertain dynamical systems. In spite of the simplicity of this heuristic approach, in some situations a more rigorous mathematical treatment of the problem is required. In this work, an adaptive fuzzy controller is proposed for nonlinear systems subject to dead-zone input. The boundedness of all closed-loop signals and the convergence properties of the tracking error are proven using Lyapunov stability theory and Barbalat's lemma. An application of this adaptive fuzzy scheme to an electro-hydraulic servo-system is introduced to illustrate the controller design method. Numerical results are also presented in order to demonstrate the control system performance.

Wallace M. Bessa; Max S. Dutra; Edwin Kreuzer

2010-01-01

291

Hydraulic model study on pump sump configuration for cooling water systems of nuclear power plants  

International Nuclear Information System (INIS)

[en] Cooling water systems of nuclear power plants play a key role in power plant operation. In particular, the ESWS (Essential Service Water System) supplies seawater as the cooling water to remove heat from the safety-related CCWS (Component Cooling Water System) via the CCW heat exchanger. The amount of cooling water required in a 1000 MW nuclear power plant is more than 50 m3/sec for each unit. Thus, it is important that the intake pumps for the cooling water are designed for proper performance. To ensure the stable pump performance, the water flow into the pump bell mouth should be in uniform and steady conditions. These flow conditions are controlled both by the location of the pump in the sump and the configuration of intake sump structure. In terms of the design, the preliminary configuration of the sump proceeds the hydraulic model study. The preliminary configuration of the sump can be determined using design guides such as HIS (Hydraulic Institute Standards) which has been standardized based on many experiments for sump structures. According to these guides, the dimension of the sump depends primarily on the diameter of pump's bell mouth. Although the preliminary configuration of sump is made using the diameter of the bell mouth, the adequacy of the preliminary configuration should be verified by a hydraulic model study to confirm whether or not the approaching flow meets the required flow condition without swirls, tornadoes and vortices. The hydraulic model study is indispensable tool to determine if the preliminary configuration of the sump is appropriate. If poor flow conditions are indicated, the configuration is revised and / or the flow improving devices are provided in the sump. This technical report focuses on the preliminary configuration of the intake sump structure and the hydraulic model study for the sump. (author)

1999-01-01

292

Scaling of Thermal-Hydraulic Phenomena and System Code Assessment  

International Nuclear Information System (INIS)

In the last five decades large efforts have been undertaken to provide reliable thermal-hydraulic system codes for the analyses of transients and accidents in nuclear power plants. Many separate effects tests and integral system tests were carried out to establish a data base for code development and code validation. In this context the question has to be answered, to what extent the results of down-scaled test facilities represent the thermal-hydraulic behaviour expected in a full-scale nuclear reactor under accidental conditions. Scaling principles, developed by many scientists and engineers, present a scientific technical basis and give a valuable orientation for the design of test facilities. However, it is impossible for a down-scaled facility to reproduce all physical phenomena in the correct temporal sequence and in the kind and strength of their occurrence. The designer needs to optimize a down-scaled facility for the processes of primary interest. This leads compulsorily to scaling distortions of other processes with less importance. Taking into account these weak points, a goal oriented code validation strategy is required, based on the analyses of separate effects tests and integral system tests as well as transients occurred in full-scale nuclear reactors. The CSNI validation matrices are an excellent basis for the fulfilling of this task. Separate effects tests in full scale play here an important role.

2008-01-01

293

Downhole hydraulic seismic generator  

Energy Technology Data Exchange (ETDEWEB)

A downhole hydraulic seismic generator system for transmitting energy wave vibrations into earth strata surrounding a borehole. The system contains an elongated, unitary housing operably connected to a well head aboveground by support and electrical cabling, and contains clamping apparatus for selectively clamping the housing to the walls of the borehole. The system further comprises a hydraulic oscillator containing a double-actuating piston whose movement is controlled by an electro-servovalve regulating a high pressure hydraulic fluid flow into and out of upper and lower chambers surrounding the piston. The spent hydraulic fluid from the hydraulic oscillator is stored and pumped back into the system to provide high pressure fluid for conducting another run at the same, or a different location within the borehole.

Gregory, Danny L. (Corrales, NM); Hardee, Harry C. (Albuquerque, NM); Smallwood, David O. (Albuquerque, NM)

1992-01-01

294

Evaluation of Bulk Modulus of Oil System with Hydraulic Line  

Directory of Open Access Journals (Sweden)

Full Text Available The aim of the paper is to experimentally measure and ealuate bulk modulus of oil/steel pipe system and oil/hose system. The measurement was performed using experimental device on the basis of a measured pressure difference depending on time. Bulk modulus is evaluated from pressure change with known flow and volume of line. Pressure rise is caused by valve closure at the line end. Furthermore, a mathematical model of the experimental device is created using Matlab SimHydraulics software. Time dependencies of pressure for the oil/steel pipe system and the oil/hose system are simulated on this mathematical model. The simulations are verified by experiment.

Hružík L.; Vašina M.; Bure?ek A.

2013-01-01

295

Selection of the 700 MWe PHWR pressuriser level control program through thermal hydraulic transient studies  

International Nuclear Information System (INIS)

[en] Full text: Conventionally the Pressuriser capacity, heater rating and the liquid level program are the important parameters to be optimized for reliable and trouble free operation of a water cooled nuclear power plants like Pressurised Heavy Water Reactor (PHWR). All these parameters are affected by the volume of the Primary Heat Transport (PHT) system and the corresponding swell/shrinkages anticipated. The magnitude of the swell/shrinkages depend on the rate of change of the PHT system fluid and structural temperatures for various transients. Based on these values the design of the PHT system pressure controller can be optimized. The 700 MWe PHWR PHT system design allows limited boiling towards the end of the coolant channel. The swell/shrinkages due to phase change are of larger magnitude but the pressure variation may be dampened during the two-phase PHT fluid condition with higher compressibility. The transition from single phase to two phase PHT system also needs to be analyzed for all the operational aspects such as the reactivity variation, process dynamics and the performance of the controllers. The secondary system behaviors also affect the PHT system volumetric changes due to thermal coupling. The performance of the selected Steam Generator Pressure Control Program (SGPC) also dictates the design of the PHT system pressure controller. The SGPC controller setting also has a considerable bearing on the performance of the PHT system pressure controller. Constant Boiler Pressure Program (CBPP) has been adopted design for this reactor. This program leads to higher values of shrinkages due to higher temperature difference between the PHT and the SGs. The design basis transient must account for the maximum credible swell/shrinkages anticipated/envisaged. The turbine trip transient and the reactor trip transient can form the basis with appropriate initial condition assumptions. The PHT system Instrumented Relief Valves sizing transient also can considered for the design basis, though this is not an operational event. This paper describes the computer simulation model that has been developed for the upcoming 700 MWe PHWR using internationally renowned, best estimate RELAP5/MOD3.2 code for the thermal hydraulic behavior. The output from these simulation studies is being utilized for performance verification of the PHT system pressure controller and the Pressuriser level control program. Earlier such studies have been performed for the 540 MWe PHWR power plants. The 700 MWe PHWR SGs differs from the earlier SGs in many of the design details. The implication of these details on the thermal hydraulic behavior and the corresponding impact on the design will be discussed. (author)

2011-01-01

296

The Control System Modeling and The Mechanical Structure Analysis For EMCVT  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The current automotive metallic belt continuously variable transmission (CVT) mostly use hydraulic system to push the cone disc and achieve the speed ratio control. A new Electrical Mechanical Continuously Variable Transmission without hydraulic control (Electrical Mechanical CVT, EMCVT) studied in ...

Lei ZHANG; Xiaomei CONG; Hujian Pan; Zuge CAI; Xiumin YANG

297

Hydraulic systems for mining equipment produced by the NIWKA Mining Machine Plant  

Energy Technology Data Exchange (ETDEWEB)

Discussed are hydraulic systems developed at the NIWKA plant and used in materials handling equipment and mine haulage equipment produced by the plant. Schemes of the hydraulic systems are shown. A short description of the systems is given. Stages of system development, improvements and operation are analyzed. The following systems are characterized: the KBH-2M system for safety winches which protect heavy mining equipment used at working faces in steep and inclined coal seams, improved hydraulic systems for the KBH-3, the KBH-5 and the KBH-6 winches, hydraulic system of the NIWKA floor cutting loader (based on the HAUSHERR licence) with 5 pneumatic drills installed in the loading bucket, and the modified hydraulic system for the NIWKA-H loader for floor cutting with hydraulic drills in the bucket, hydraulic system of hydraulic drills used on the NIWKA-H loaders. Tests of the hydraulic systems used in experimental units of the NIWKA-H loader are evaluated. Subsequent to successful testing 5 NIWKA-H loaders were produced in 1982 for use in the Lublin coal basin. (In Polish)

Warachim, W.

1983-02-01

298

Reducing leaks in water distribution networks. Controlling pressure by means of automatic hydraulic valves; Reduccion de fugas en redes de distribucion de agua. Control de la presion mediante valvulas hidraulicas automaticas  

Energy Technology Data Exchange (ETDEWEB)

Any water distribution network, bet it of drinking water or irrigation water, always loses an inevitable amount. One of the main ways to reduce leaks is to optimise the pressure in the network by means of hydraulic valves with different types of control devices. These can be either completely hydraulic or supplemented by electronic systems. (Author)

Singla Font, S.

2005-07-01

299

IT-Tools Concept for Simulation and Design of Water Hydraulic Mechatronic Test Facilities for Motion Control and Operation in Environmentally Sensitive Application Areas  

DEFF Research Database (Denmark)

This paper presents a proposed IT-Tools concept for modeling, simulation, analysis and design of water hydraulic actuators for motion control of machines, lifts, cranes and robots. The designed test rigs have tap water hydraulic components of the Danfoss Nessie® product family and equipped with a measurement and data acquisition system. Results of the mathematical modeling, simulation and design of the motion control test rigs are presented. Furthermore, the paper presents selected experimental and identifying test results for the water hydraulic test rigs.

Conrad, Finn; Pobedza, J.

2004-01-01

300

Pneumatic and Hydraulic Systems in Coal Fluidized Bed Combustor  

Directory of Open Access Journals (Sweden)

Full Text Available Problem statement: This study designed the pneumatic and hydraulic systems in coal fluidized bed combustor. These are fluidization of silica sand bed material, Air distributor, centrifugal fan, electric motor power drive and surface heat exchanger. Approach: The effects of increased gas velocity on silica sand and the resultant drag force formed the basic equations in fluidization. Air distributor was introduced to achieve pressure drop across the beds. Results: The constructed centrifugal fan was driven by selected electric motor based on pressure and temperature changes in the reactor. The dimensions of the heat transfer tube were calculated from fluid flow and energy balance equations. The values obtained were as the follows: Fluidization velocity (1.54 m sec-­1), gas velocity through orifice (29.52 m sec-1), the fan electric motor (2 KW, 3 ph at 1500 pm), the steam temperature obtained was 160°C from water ambient temperature of 30°C and tube length 22 m was coiled into levels in the combustor. Conclusion/Recommendation: Precise specifications of pneumatic and hydraulic systems will adequately address the environment concern of coal fired power supply as a method to address epileptic power supply in Nigeria.

Z. O. Opafunso; I. I. Ozigis; I. A. Adetunde

2009-01-01

 
 
 
 
301

Hydraulic transients in cooling-water systems: Final report  

Energy Technology Data Exchange (ETDEWEB)

This report constitutes a comprehensive investigation of hydraulic transients in cooling water systems of power stations, with emphasis on once-through configurations. The three major thrusts of the program were (1) a critical survey of experience with transients in CW systems worldwide; (2) collection and analysis of field data from the Shoreham Nuclear Station CW system, and (3) the development and testing of numerical algorithms for analysis. As a result of the experience at many power stations and the difficulty in analytically modelling hydraulic transients because of the uncertainty regarding the amount of free air present in a CW system, design and test methodologies are outlined. A careful survey of field experiences from a number of operating CW systems throughout the world indicates that severe pressure surges occur infrequently as a result of pump power failure. In fact, experience has shown that vacuum breakers are not necessary for all once-through systems. Field results often yield, maximum pressures that are far less than those predicted from waterhammer codes that do not allow for the presence of free air from any source. Indeed, on-site measurements at Shoreham yielded peak pressures always less than initial steady ones for the case of pump power failure. The difference between calculation and observation is attributed to free air, the amount of which is very difficult to predict. Two numerical codes were developed to simulate the presence of free air in a CW system in distributed or lumped modes. Both codes, a modified method of characteristics and a four-point implicit technique, produce similar results, and are viewed as well developed and adequate. 68 refs., 35 figs., 6 tabs.

Martin, C.S.; Wiggert, D.C.

1989-06-01

302

Non-linear modelling and optimal control of a hydraulically actuated seismic isolator test rig  

Science.gov (United States)

This paper investigates the modelling, parameter identification and control of an unidirectional hydraulically actuated seismic isolator test rig. The plant is characterized by non-linearities such as the valve dead zone and frictions. A non-linear model is derived and then employed for parameter identification. The results concerning the model validation are illustrated and they fully confirm the effectiveness of the proposed model.The testing procedure of the isolation systems is based on the definition of a target displacement time history of the sliding table and, consequently, the precision of the table positioning is of primary importance. In order to minimize the test rig tracking error, a suitable control system has to be adopted. The system non-linearities highly limit the performances of the classical linear control and a non-linear one is therefore adopted. The test rig mathematical model is employed for a non-linear control design that minimizes the error between the target table position and the current one. The controller synthesis is made by taking no specimen into account. The proposed approach consists of a non-linear optimal control based on the state-dependent Riccati equation (SDRE). Numerical simulations have been performed in order to evaluate the soundness of the designed control with and without the specimen under test. The results confirm that the performances of the proposed non-linear controller are not invalidated because of the presence of the specimen.

Pagano, Stefano; Russo, Riccardo; Strano, Salvatore; Terzo, Mario

2013-02-01

303

Analyses of the troubles in the hydraulic system of coalcutter by iron spectrum technology  

Energy Technology Data Exchange (ETDEWEB)

This paper describes how the iron spectrum technology is applied to monitoring the troubles in hydraulic system for coalcutter tractor. Comparison of the test readings with the records of the coalcutter motion show that the iron spectrum technology is an effective tool for diagnosing the troubles in the coalcutter hydraulic system. The author also recommends maintenance routines and the suitable hydraulic oil to be used in the machines. 5 figs., 1 tab.

1987-08-01

304

Electric versus hydraulic drives  

Energy Technology Data Exchange (ETDEWEB)

This volume records the proceedings of a conference organised by the Engineering Manufacturing Industries Division of the Institution of Mechanical Engineers. Topics considered include high performance position control - a review of the current state of developments; hydrostatic drives - present and future; electric drives - present and future trends; electrical and hydraulic drives for heavy industrial robots; the development of an electro-mechanical tilt system for the advanced passenger train; industrial hydraulic ring mains - effective or efficient. the comparison of performance of servo feed-drive systems; overhead crane drives; the future of d.c. servodrives; the choice of actuator for military systems; linear electro-hydraulic actuators; and actuation for industrial robots.

1983-01-01

305

Internal coordination between hydraulics and stomatal control in leaves.  

UK PubMed Central (United Kingdom)

The stomatal response to changing leaf-atmospheric vapour pressure gradient (D(l)) is a crucial yet enigmatic process that defines the daily course of leaf gas exchange. Changes in the hydration of epidermal cells are thought to drive this response, mediated by the transpiration rate and hydraulic conductance of the leaf. Here, we examine whether species-specific variation in the sensitivity of leaves to perturbation of D(l) is related to the efficiency of water transport in the leaf (leaf hydraulic conductivity, K(leaf)). We found good correlation between maximum liquid (K(leaf)) and gas phase conductances (g(max)) in leaves, but there was no direct correlation between normalized D(l) sensitivity and K(leaf). The impact of K(leaf) on D(l) sensitivity in our diverse sample of eight species was important only after accounting for the strong relationship between K(leaf) and g(max). Thus, the ratio of g(max)/K(leaf) was strongly correlated with stomatal sensitivity to D(l). This ratio is an index of the degree of hydraulic buffering of the stomata against changes in D(l), and species with high g(max) relative to K(leaf) were the most sensitive to D(l) perturbation. Despite the potentially high adaptive significance of this phenomenon, we found no significant phylogenetic or ecological trend in our species.

Brodribb TJ; Jordan GJ

2008-11-01

306

Study on the effect of hydraulic system models on power system dynamic stability analysis  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The dynamic models of hydraulic system used in power system dynamic stability analysis are presented. Different models considering elastic or rigid-hamming are established. Together with the conventional models of the power system, the power system dynamic stability analytical software is improved. ...

Chen, Zhou; Diao, Qinghua; Chen, Shousun; Zhang, Zhonghua; Ni, Yixin

307

Field investigation on consumer behavior and hydraulic performance of a district heating system in Tianjin, China  

Energy Technology Data Exchange (ETDEWEB)

With the implementation of heat reforms in China, the application of thermostatic radiator valves (TRVs) has been gaining popularity in the new-style district heating systems (DHSs). The objective of this study was to investigate consumer behavior (including regulation of TRVs and opening of windows) and its influences on the hydraulic performance and energy consumption of individuals and the whole system. The concurrence rate of individual behaviors and hydraulic interactions between individuals were analyzed. This study should be helpful to gain a comprehensive understanding of the new DHSs in China and consider a proper design/control strategy for these systems. Questionnaires and field observations of consumer behavior, tests of hydraulic performance, and surveys of energy consumption were carried out in a DHS in Tianjin, which was one of the heat metering and billing demonstration projects in China. The main results of the tests were as follows: water flow performance in apartment-level heating systems were diverse because consumers' behavior was varied and unpredictable, and the hydraulic interaction between consumers living along the line of a vertical pipe was obvious, and was stronger for terminal consumers with their TRVs set to higher values; however, flow variations in the whole DHS, which included 910 households, were relatively constant. A probability analysis was carried out to explain this phenomenon, and the conclusion was drawn that when there were more than 200 consumers, the stochastic consumer regulation behavior would bring less than 10% of total flow variations. Finally, the power consumption of the circulation pump, heat consumption and energy-saving potential of this type of DHS were discussed and some suggestions for TRV regulation and pump operation were made. (author)

Xu, Baoping; Fu, Lin; Di, Hongfa [Department of Building Science, Tsinghua University, Beijing 100084 (China)

2009-02-15

308

Scaling in nuclear reactor system thermal-hydraulics  

International Nuclear Information System (INIS)

Scaling is a reference 'key-word' in engineering and in physics. The relevance of scaling in the water cooled nuclear reactor technology constitutes the motivation for the present paper. The origin of the scaling-issue, i.e. the impossibility to get access to measured data in case of accident in nuclear reactors, is discussed at first. The so-called 'scaling-controversy' constitutes an outcome. Then, a critical survey (or 'scaling state-of-art';) is given of the attempts and of the approaches to provide a solution to the scaling-issue in the area of Nuclear Reactor System Thermal-Hydraulics (NRSTH): dimensionless design factors for Integral Test Facilities (ITF) are distinguished from scaling factors. The last part of the paper has a two-fold nature: (a) classifying the information about achievements in the area of thermal-hydraulics which are relevant to scaling: the concepts of 'scaling-pyramid' and the related 'scaling bridges' are introduced; (b) establishing a logical path across the scaling achievements (represented as a 'scaling puzzle'). In this context, the 'roadmap for scaling' is proposed: the objective is addressing the scaling issue when demonstrating the applicability of system codes in the licensing process of nuclear power plants. The code itself is referred hereafter as the 'key-to-scaling'. The database from the operation of properly scaled ITF and the availability of qualified system codes are identified as main achievements in NRSTH connected with scaling. The 'roadmap to scaling' constitutes a unified approach to scaling which aims at solving the 'scaling puzzle' created by researches performed during a half-a-century period.

2008-10-01

309

Hydraulic manipulator research at ORNL  

Energy Technology Data Exchange (ETDEWEB)

Recently, task requirements have dictated that manipulator payload capacity increase to accommodate greater payloads, greater manipulator length, and larger environmental interaction forces. General tasks such as waste storage tank cleanup and facility dismantlement and decommissioning require manipulator life capacities in the range of hundreds of pounds rather than tens of pounds. To meet the increased payload capacities demanded by present-day tasks, manipulator designers have turned once again to hydraulics as a means of actuation. In order to successfully design, build, and deploy a new hydraulic manipulator (or subsystem), sophisticated modeling, analysis, and control experiments are usually needed. Oak Ridge National Laboratory (ORNL) has a history of projects that incorporate hydraulics technology, including mobile robots, teleoperated manipulators, and full-scale construction equipment. In addition, to support the development and deployment of new hydraulic manipulators, ORNL has outfitted a significant experimental laboratory and has developed the software capability for research into hydraulic manipulators, hydraulic actuators, hydraulic systems, modeling of hydraulic systems, and hydraulic controls. The purpose of this article is to describe the past hydraulic manipulator developments and current hydraulic manipulator research capabilities at ORNL. Included are example experimental results from ORNL`s flexible/prismatic test stand.

Kress, R.L.; Jansen, J.F. [Oak Ridge National Lab., TN (United States); Love, L.J. [Oak Ridge Inst. for Science and Education, TN (United States)

1997-03-01

310

Hydraulic manipulator research at ORNL  

International Nuclear Information System (INIS)

[en] Recently, task requirements have dictated that manipulator payload capacity increase to accommodate greater payloads, greater manipulator length, and larger environmental interaction forces. General tasks such as waste storage tank cleanup and facility dismantlement and decommissioning require manipulator life capacities in the range of hundreds of pounds rather than tens of pounds. To meet the increased payload capacities demanded by present-day tasks, manipulator designers have turned once again to hydraulics as a means of actuation. In order to successfully design, build, and deploy a new hydraulic manipulator (or subsystem), sophisticated modeling, analysis, and control experiments are usually needed. Oak Ridge National Laboratory (ORNL) has a history of projects that incorporate hydraulics technology, including mobile robots, teleoperated manipulators, and full-scale construction equipment. In addition, to support the development and deployment of new hydraulic manipulators, ORNL has outfitted a significant experimental laboratory and has developed the software capability for research into hydraulic manipulators, hydraulic actuators, hydraulic systems, modeling of hydraulic systems, and hydraulic controls. The purpose of this article is to describe the past hydraulic manipulator developments and current hydraulic manipulator research capabilities at ORNL. Included are example experimental results from ORNL's flexible/prismatic test stand

1997-05-01

311

Analysis of Dither in PWM Control on Electro-hydraulic Proportional Valve  

Directory of Open Access Journals (Sweden)

Full Text Available Plus with modulation (PWM) is widely used in proporational control systems for it is efficient, flexible and anti-interference. Due to the friction and hysteresis of electromagnet, hysteresis exists when hydraulic valve in steady-state, and hysteresis influences the dynamic characteristics of the valve seriously,the hysteresis can be improved by superimposing dithers with certain frequency and amplitude to the valve coil. Aiming at the character of anti-unloading power driver circuit ,this paper analyzed the parasitic dither which exists in ±24V PWM control?besides?the experiment shows that in a high frequency PWM, dither with independent frequency and amplitude can be generated by changing the frequency of the PWM, in this way, the dithers  and average current of coil  can be adjusted separately by changing PWM frequency and PWM duty cycle.  

Guoping LIU; Wuxing XIA; Dawei QI; Ronghua HU

2013-01-01

312

Thermal hydraulic test for core cooling system using steam generators  

International Nuclear Information System (INIS)

As a candidate of the new concept safety system for the next generation PWR in Japan, the hybrid safety systems, which are combination of the active and the passive safety systems, and passive core cooling system by natural circulation in the reactor coolant loop with horizontal-type steam generators during Loss of Coolant Accidents (LOCAs) are investigated. The passive safety systems are advanced accumulators (ACC), primary-side and secondary-side automatic-depressurization systems (ADS, SADS), and a gravity-driven safety injection system (GDI). The horizontal steam generator design avoids a siphon break caused from the accumulation of non-condensable gases in the tubes by using a vent line in the channel head of the steam generators. This study investigates the passive core cooling characteristics of horizontal-type steam generators under LOCAs. The integrated thermal-hydraulic test has been performed at the Simulation Loop for the Innovative Mitsubishi Simplified PWR (SLIM) test facility. The facility simulates the prototype plant with the volumetric scaling ratio of 1/1000 and the elevation scaling ratio of 1/1. Experimental results show good vent performance of non-condensable gasses. Furthermore, experiments also show that after a large LOCA steady natural circulation in the reactor coolant loop is resumed after the break portion is submerged. Sufficient core cooling for both small and large LOCA was also confirmed. (author)

1999-01-01

313

Thermal hydraulic test for core cooling system using steam generators  

Energy Technology Data Exchange (ETDEWEB)

As a candidate of the new concept safety system for the next generation PWR in Japan, the hybrid safety systems, which are combination of the active and the passive safety systems, and passive core cooling system by natural circulation in the reactor coolant loop with horizontal-type steam generators during Loss of Coolant Accidents (LOCAs) are investigated. The passive safety systems are advanced accumulators (ACC), primary-side and secondary-side automatic-depressurization systems (ADS, SADS), and a gravity-driven safety injection system (GDI). The horizontal steam generator design avoids a siphon break caused from the accumulation of non-condensable gases in the tubes by using a vent line in the channel head of the steam generators. This study investigates the passive core cooling characteristics of horizontal-type steam generators under LOCAs. The integrated thermal-hydraulic test has been performed at the Simulation Loop for the Innovative Mitsubishi Simplified PWR (SLIM) test facility. The facility simulates the prototype plant with the volumetric scaling ratio of 1/1000 and the elevation scaling ratio of 1/1. Experimental results show good vent performance of non-condensable gasses. Furthermore, experiments also show that after a large LOCA steady natural circulation in the reactor coolant loop is resumed after the break portion is submerged. Sufficient core cooling for both small and large LOCA was also confirmed. (author)

Senda, Yasuhide; Suzuta, Tadahiko; Ueno, Takashi; Kodama, Junichiro; Nakamori, Nobuo; Tsuge, Ayao; Naito, Takashi; Tabuchi, Kozo [Mitsubishi Heavy Industries Ltd., Tokyo (Japan)

1999-07-01

314

The design of an electro-hydraulically controlled, manual transmission for a hybrid electric vehicle  

Energy Technology Data Exchange (ETDEWEB)

An electro-hydraulically controlled, manual transmission has been developed for the Department of Energy's FutureCar Challenge. This project which is jointly sponsored by the DOE and the Partnership for a New Generation of Vehicles (PNGV) seeks to modify a production mid-size car to reach 80 mpg, yet still maintain the safety and consumer acceptability of the original vehicle. To meet this challenge, a 1996 Ford Taurus has been modified into a parallel drive, hybrid electric vehicle. The propulsion system of this vehicle is based on a DC electric motor, which is coupled via a belt drive, in parallel, with a 1.9 liter turbo-charged, direct injection diesel engine. Both propulsion units are then coupled to the transmission. The OEM automatic transmission has been replaced with a five-speed, manual transmission, which was adapted from an earlier model year production Taurus SHO vehicle. This transmission is both lighter and more mechanically efficient than the automatic transmission. In order to provide the automatic transmission shifting capabilities expected by the consumer for a vehicle of this size, an electro-hydraulic control unit was designed and built. This unit automatically engages the clutch and shifts gears as required during vehicle operation. Gear selection is controlled by a programmable logic controller (PLC), which utilizes throttle and vehicle speed input signals. Additionally, the driver may select gears using a modified steering-column PRNDL selector. This paper discusses the final design of this system and provides an evaluation of its performance.

Davis, G.W.; Hoff, C.J.

1998-07-01

315

Determining the optimum parameters of a hydraulic system with the turbine method of drilling wells  

Energy Technology Data Exchange (ETDEWEB)

A mathematical model is given of the operation of the hydraulic system with the turbine method of well drilling. Based on the calculation data, recommendations are given on the use of a turbine type bottom motor. The problem is formulated of controlling the process using the basic parameters: axial load and use of wash fluid. The functional connection is determined between the input parameters of the process and the function at the system's output. The calculations are done for different depths on the EC-1033 computer.

Pokrovskaya, G.A.

1981-01-01

316

Innovative hydraulic line-ups of heating systems. Pt. 2  

Energy Technology Data Exchange (ETDEWEB)

Now as before, both thermostats and existing plants to be retrofitted or modernized are putting obstacles in the way of the hydraulic line-up of heating systems. The paper presents a relatively simple solution developed by an engineering office located in Hamm, Federal Republic of Germany. Part two discusses the method with regard to piping calculations and line-ups. Pressure losses of both flow and reflux pipes are calculated and listed separately. As soon as the pump suiting the pressure difference of the worst-case radiator is selected, the excess between pumping performance and the required pressure difference must be lined up closest to the pump by increasing the pressure losses in ideally one pipe segment.

Soyer, J.

1987-08-01

317

Non-linear seismic analysis in NSSS system for SG hydraulic snubber elimination  

International Nuclear Information System (INIS)

In the structural design of nuclear power plants, large bore hydraulic snubbers are used in the steam generator (SG) upper support system due to their ability to accommodate the large thermal movement of the SG during plant heatup/cooldown and yet provide restraint to the SG for dynamic loadings such as postulated piping rupture and seismic events. Due to the complexity of the control valve, hydraulic snubbers are very sensitive to abnormalities or changes in the hydraulic fluid. Additionally, snubber service life and operation are directly influenced by the durability of the snubber seal materials. Each of these factors significantly affects the operability of the hydraulic snubber and contributes to the continuing need to monitor and periodically test the performance of the snubbers. In light of the increasing costs to the utilities on the maintenance and testing of these snubbers, analytical methods were developed in order to eliminate all the large bore SG snubbers through the use of non-linear seismic analysis, innovative hardware design and modification, and component reserve design margins. The benefit of this snubber elimination program is to minimize plant operation costs through reductions in plant outage activities and man-rem exposures resulting from eliminated snubber inspection, testing, maintenance and refurbishment. This paper presents a procedure along with analytical techniques used in the non-linear seismic analysis for the snubber-eliminated support configuration. Through this non-linear time-history analysis technique, the analysis resulted in, generally, load reductions in the Reactor Coolant Loop (RCL) system since the original analysis was based on a very conservative response spectra analysis technique. Hence the system components are all qualified.

1995-01-01

318

Non-linear seismic analysis in NSSS system for SG hydraulic snubber elimination  

Energy Technology Data Exchange (ETDEWEB)

In the structural design of nuclear power plants, large bore hydraulic snubbers are used in the steam generator (SG) upper support system due to their ability to accommodate the large thermal movement of the SG during plant heatup/cooldown and yet provide restraint to the SG for dynamic loadings such as postulated piping rupture and seismic events. Due to the complexity of the control valve, hydraulic snubbers are very sensitive to abnormalities or changes in the hydraulic fluid. Additionally, snubber service life and operation are directly influenced by the durability of the snubber seal materials. Each of these factors significantly affects the operability of the hydraulic snubber and contributes to the continuing need to monitor and periodically test the performance of the snubbers. In light of the increasing costs to the utilities on the maintenance and testing of these snubbers, analytical methods were developed in order to eliminate all the large bore SG snubbers through the use of non-linear seismic analysis, innovative hardware design and modification, and component reserve design margins. The benefit of this snubber elimination program is to minimize plant operation costs through reductions in plant outage activities and man-rem exposures resulting from eliminated snubber inspection, testing, maintenance and refurbishment. This paper presents a procedure along with analytical techniques used in the non-linear seismic analysis for the snubber-eliminated support configuration. Through this non-linear time-history analysis technique, the analysis resulted in, generally, load reductions in the Reactor Coolant Loop (RCL) system since the original analysis was based on a very conservative response spectra analysis technique. Hence the system components are all qualified.

Parthasarathy, K.S. [Wolf Creek Nuclear Operation Corp., Burlington, KS (United States); Bettenhausen, D.L. [Union Electric, Fulton, MO (United States); Liu, T.H. [Westinghouse Electric Corp., Pittsburgh, PA (United States)

1995-12-31

319

Hydraulic transient analysis for PWR auxiliary feedwater system  

International Nuclear Information System (INIS)

[en] The Auxiliary Feed Water (AFW) system in a PWR plant is a safety related critical system, it provides cooling water to steam generators for removal of sensible heat to safely shut and cool down the reactor primary system when the main feedwater system is not available. The system in a Taiwan Power Company's PWR unit consists of two(2) motor driven and one(1) turbine pumps (AFWP) taking suctions from Condensate Storage Tank (CST) and discharging to three(3) steam generators through 929 feet piping and more than 73 valves. During early system pre-operational phase, the two(2) motor driven AFWPs were damaged after two(2) days continuous operation of the system. After investigation, interim fixes were taken and hydraulic transient analysis was performed to provide data and information for long term betterment of the systems and for operational reference. The transient analysis was based on the characteristic method, using the computer programs, HYTRAN, developed by Taipower engineers (Messrs: HH Lee and WC Lin). The accuracy of the HYTRAN was bench marked by comparison with the transient test data of the system and by comparison with comparable computer programs. The comparison with the test data showed close equivalence of the analysis data and the test data. This paper highlights the transient analysis method with detail descriptions of the equipment modelling techniques of the system and components. Both the analysis and test results of the system revealed the AFWP suction pressure will drop close to the fluid vapor pressure under certain mode of the system operation, that caused the damage of the two(2) motor driven AFWPs. (author)

1986-01-01

320

ECOLOGICAL, BIODEGRADABLE, FLUID LUBRICANT AND ANTI-FREEZING COMPOSITION FOR HYDRAULIC SYSTEMS  

UK PubMed Central (United Kingdom)

An ecological, biodegradable, fluid lubricant and anti-freezing composition for hydraulic systems contains glycol, corrosion inhibitors and antifoaming agents, and must be diluted in water, either before or after it is fed into the hydraulic system, including a shock absorber, preferably in a concentration of 30% to 70% by volume of the composition and of 30% to 70% by volume water.

GALVAO ROBERTO ANDRADE

 
 
 
 
321

ECOLOGICAL, BIODEGRADABLE, FLUID LUBRICANT AND ANTI-FREEZING COMPOSITION FOR HYDRAULIC SYSTEMS  

UK PubMed Central (United Kingdom)

An ECOLOGICAL, BIODEGRADABLE, FLUID LUBRICANT AND ANTI-FREEZING COMPOSITION FOR HYDRAULIC SYSTEMS , contains glycol, corrosion inhibitors and antifoaming agents, and must be diluted in water, either before or after it is fed into the hydraulic system, including shock absorber, preferably in a concentration of 30% to 70% by volume of the composition and of 30% to 70% by volume of water.

GALVAO ROBERTO ANDRADE

322

MULTIFLEX: a FORTRAN-IV Computer Program for analyzing thermal-hydraulic-structure system dynamics  

International Nuclear Information System (INIS)

MULTIFLEX is a computer code to calculate hydraulic force for structure evaluation during the LOCA type transient. A description is given of the program and the mathematical representation of the thermal-hydraulic system interacting with the mechanical structure system. It also covers recommended modelings, code verification, and the post-processors, LATFORC and FORCE-2

1976-01-01

323

Research on hydraulic system of KZC-5 type rear dump truck in underground mine  

International Nuclear Information System (INIS)

KZC-5 type rear dump truck in underground mine is introduced in this paper. The determining principles and ways of two main hydraulic systems are discussed. It has been proved that the hydraulic systems are reasonable in the industrial scale test. (author)

2005-01-01

324

Active control system for high speed windmills  

Science.gov (United States)

A pump stroke is matched to the operating speed of a high speed windmill. The windmill drives a hydraulic pump for a control. Changes in speed of a wind driven shaft open supply and exhaust valves to opposite ends of a hydraulic actuator to lengthen and shorten an oscillating arm thereby lengthening and shortening the stroke of an output pump. Diminishing wind to a stall speed causes the valves to operate the hydraulic cylinder to shorten the oscillating arm to zero. A pressure accumulator in the hydraulic system provides the force necessary to supply the hydraulic fluid under pressure to drive the actuator into and out of the zero position in response to the windmill shaft speed approaching and exceeding windmill stall speed. 4 figs.

Avery, D.E.

1988-01-12

325

Active control system for high speed windmills  

Energy Technology Data Exchange (ETDEWEB)

A pump stroke is matched to the operating speed of a high speed windmill. The windmill drives a hydraulic pump for a control. Changes in speed of a wind driven shaft open supply and exhaust valves to opposite ends of a hydraulic actuator to lengthen and shorten an oscillating arm thereby lengthening and shortening the stroke of an output pump. Diminishing wind to a stall speed causes the valves to operate the hydraulic cylinder to shorten the oscillating arm to zero. A pressure accumulator in the hydraulic system provides the force necessary to supply the hydraulic fluid under pressure to drive the actuator into and out of the zero position in response to the windmill shaft speed approaching and exceeding windmill stall speed.

Avery, Don E. (45-437 Akimala St., Honolulu, HI 96744)

1988-01-01

326

COBRA-SFS, Thermal Hydraulics of Spent Fuel Storage System  

International Nuclear Information System (INIS)

[en] 1 - Description of program or function: COBRA-SFS is used for steady- state and transient thermal-hydraulic analysis of spent fuel storage systems as well as other heat transfer and fluid flow problems. It is designed to predict flow and temperature distributions under a wide range of flow conditions, including mixed and natural convection. Two auxiliary programs, RADX1 and RADGEN, generate blackbody view factors and calculate radiation exchange factors for unconsolidated spent fuel assemblies to be supplied as input to COBRA-SFS. 2 - Method of solution: The thermal-hydraulic analysis is separated into two parts - a flow field solution and an energy solution. COBRA-SFS solves a set of incompressible subchannel equations for mass and momentum conservation in the coolant and energy conservation in the fuel rods, solid structures, and coolant. The RECIRC solution method, a Newton-Raphson technique, is used to iteratively solve these equations. Radiation heat transfer between rod and slab surfaces is modeled using detailed radiation exchange factors, which are calculated from the geometry of the problem and the emissivities of the participating surfaces. The subchannel equations are fully implicit in time. 3 - Restrictions on the complexity of the problem - PARAMETER statements presently impose a maxima of: 50 channel gap connections, 40 channels, 20 fuel rods, 40 slab connections, 1 fuel types, 6 assemblies, 9 fuel rods interacting with a channel, 6 fuel nodes per fuel rod, 4 axial fuel type divisions. By modifying PARAMETER statements, code dimensioning limits can be changed to fit any given problem, limited only by available storage

1990-01-01

327

Developing a Tool Point Control Scheme for a Hydraulic Crane Using Interactive Real-time Dynamic Simulation  

Directory of Open Access Journals (Sweden)

Full Text Available This paper describes the implementation of an interactive real-time dynamic simulation model of a hydraulic crane. The user input to the model is given continuously via joystick and output is presented continuously in a 3D animation. Using this simulation model, a tool point control scheme is developed for the specific crane, considering the saturation phenomena of the system and practical implementation.

Mikkel M. Pedersen; Michael R. Hansen; Morten Ballebye

2010-01-01

328

Control of hydraulic turbines using fuzzy logic; Steuerung und Regelung von Wasserturbinen mit Fuzzy-Logik  

Energy Technology Data Exchange (ETDEWEB)

It was investigated to what extent fuzzy logic can be applied to the control of hydraulic turbines. This showed that for the automatic control of turbine load or turbine speed the results are of a similar quality as those obtained by traditional algorithms. In the case of events like the start of a turbine, which normally proceeds first as an open loop control system and then - after activation of an automatic speed controller - as a closed loop control system, fuzzy logic can be advantageous. Fuzzy logic is also suitable for monitoring the water level in surge chambers, so that overflowing and emptying can be safely avoided. The examples presented here provide an overview of the possibilities of application. (orig.) [German] In dem Beitrag wird untersucht, in wie weit sich die Fuzzy-Logik auf Steuerungs- und Regelungsaufgaben im Bereich der Wasserturbinen anwenden laesst. Es zeigt sich, dass z.B. fuer die Drehzahl- und die Leistungsregelung aehnlich gute Ergebnisse erzielt werden koennen, wie mit konventioneller Regelung. Bei Vorgaengen, die normalerweise teils gesteuert, teils geregelt verlaufen, wie z.B. das Anfahren, kann die Fuzzy-Logik Vorteile bringen. Gut geeignet ist die Fuzzy-Logik auch zur Ueberwachung von Wasserschloessern, so dass ein Ueberlaufen oder Leerlaufen sicher verhindert wird. Die vorgestellten Beispiele geben einen Ueberblick ueber die Moeglichkeiten. (orig.)

Lein, G.; Isenrich, P.L. [Inst. fuer Stroemungsmechanik und Hydraulische Stroemungsmaschinen, Univ. Stuttgart, Stuttgart (Germany)

2002-07-01

329

Effect of hydraulic system models on power system transient stability analysis  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The dynamic models of hydraulic system used in power system transient stability analysis are presented. The dynamic characteristic of turbines and conduits are studied in detail. Different models taking elastic or rigid water-hammers into consideration are established. Together with the conventional...

Chen, Zhou; Chen, Shousun; Zhang, Zhonghua; Ni, Yixin

330

Optimal design of pump-and-treat systems under uncertain hydraulic conductivity and plume distribution.  

Science.gov (United States)

In this work, we present a stochastic optimal control framework for assisting the management of the cleanup by pump-and-treat of polluted shallow aquifers. In the problem being investigated, hydraulic conductivity distribution and dissolved contaminant plume location are considered as the uncertain variables. The framework considers the subdivision of the cleanup horizon in a number of stress periods over which the pumping policy implemented until that stage is dynamically adjusted based upon new information that has become available in the previous stages. In particular, by following a geostatistical approach, we study the idea of monitoring the cumulative contaminant mass extracted from the installed recovery wells, and using these measurements to generate conditional realizations of the hydraulic conductivity field. These realizations are thus used to obtain a more accurate evaluation of the initial plume distribution, and modify accordingly the design of the pump-and-treat system for the remainder of the remedial process. The study indicates that measurements of contaminant mass extracted from pumping wells retain valuable information about the plume location and the spatial heterogeneity characterizing the hydraulic conductivity field. However, such an information may prove quite soft, particularly in the instances where recovery wells are installed in regions where contaminant concentration is low or zero. On the other hand, integrated solute mass measurements may effectively allow for reducing parameter uncertainty and identifying the plume distribution if more recovery wells are available, in particular in the early stages of the cleanup process. PMID:18635286

Baú, Domenico A; Mayer, Alex S

2008-05-17

331

Development of an Advanced Hydraulic Fracture Mapping System  

Energy Technology Data Exchange (ETDEWEB)

The project to develop an advanced hydraulic fracture mapping system consisted of both hardware and analysis components in an effort to build, field, and analyze combined data from tiltmeter and microseismic arrays. The hardware sections of the project included: (1) the building of new tiltmeter housings with feedthroughs for use in conjunction with a microseismic array, (2) the development of a means to use separate telemetry systems for the tilt and microseismic arrays, and (3) the selection and fabrication of an accelerometer sensor system to improve signal-to-noise ratios. The analysis sections of the project included a joint inversion for analysis and interpretation of combined tiltmeter and microseismic data and improved methods for extracting slippage planes and other reservoir information from the microseisms. In addition, testing was performed at various steps in the process to assess the data quality and problems/issues that arose during various parts of the project. A prototype array was successfully tested and a full array is now being fabricated for industrial use.

Norm Warpinski; Steve Wolhart; Larry Griffin; Eric Davis

2007-01-31

332

Development of realistic thermal hydraulic system analysis code  

International Nuclear Information System (INIS)

[en] The realistic safety analysis system is essential for nuclear safety research, advanced reactor development, safety analysis in nuclear industry and 'in-house' plant design capability development. In this project, we have developed a best-estimate multi-dimensional thermal-hydraulic system code, MARS, which is based on the integrated version of the RELAP5 and COBRA-TF codes. To improve the realistic analysis capability, we have improved the models for multi-dimensional two-phase flow phenomena and for advanced two-phase flow modeling. In addition, the GUI (Graphic User Interface) feature were developed to enhance the user's convenience. To develop the coupled analysis capability, the MARS code were linked with the three-dimensional reactor kinetics code (MASTER), the core thermal analysis code (COBRA-III/CP), and the best-estimate containment analysis code (CONTEMPT), resulting in MARS/MASTER/COBRA/CONTEMPT. Currently, the MARS code system has been distributed to 18 domestic organizations, including research, industrial, regulatory organizations and universities. The MARS has been being widely used for the safety research of existing PWRs, advanced PWR, CANDU and research reactor, the pre-test analysis of TH experiments, and others

2002-01-01

333

Hydraulic modeling of a mixed water level control hydro-mechanical gate  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The article describes the hydraulic functioning of a mixed water level control hydromechanical gate present in several irrigation canals. According to the flow conditions, this automatic gate maintains the upstream level close to a target value for low flow, then it controls the downstream level clo...

Cassan, L.; Baume, J-P.; Belaud, G.; Litrico, X.; Malaterre, P-O.; Ribot-Bruno, J.

334

Mathematical models and computer simulation of hydraulic system of powered support  

Energy Technology Data Exchange (ETDEWEB)

To study the dynamic characteristics of a powered support hydraulic system and its effect on the action of a powered support, a dynamic model of hydraulic system is established by means of power bond graph. A simulation program is designed. The working process and the relevant properties of the system are simulated by the program. The conclusions of the study can be used as the guidelines for the design of the system and for improving performance. This study provides an effective method for the evaluation and improvement of a powered support hydraulic system. 3 refs., 7 figs., 2 tabs.

Li, X.; Li, J. [Fuxin Mining Institute (China)

1996-02-01

335

CONTROL SYSTEM  

Science.gov (United States)

A boiling water type nuclear reactor power system having improved means of control is described. These means include provisions for either heating the coolant-moderator prior to entry into the reactor or shunting the coolantmoderator around the heating means in response to the demand from the heat engine. These provisions are in addition to means for withdrawing the control rods from the reactor. (AEC)

Shannon, R.H.; Williamson, H.E.

1962-10-30

336

Basic research on packing for the hydraulic system; Suiatsu system yo packing ni kansuru kiso kenkyu  

Energy Technology Data Exchange (ETDEWEB)

The water hydraulic system using tap water as a working fluid has much more advantages such as harmony with humans/environment and easy availability than the oil hydraulic system. However, it has subjects on low viscosity, adaptability to materials, etc. Therefore, experimental studies were carried out mainly on friction/abrasion characteristics in case of using O ring as packing in the low pressure field, using surface roughness on the sliding portion, pressure and a quality of O ring as parameters. (translated by NEDO)

Ono, Y.; Yamaguchi, A. [Yokohama National University, Yokohama (Japan); Kobayashi, T. [Hitachi, Ltd., Tokyo (Japan)

1999-01-15

337

Thermal-Hydraulic Analysis Tasks for ANAV NPPs in Support of Plant Operation and Control  

Directory of Open Access Journals (Sweden)

Full Text Available Thermal-hydraulic analysis tasks aimed at supporting plant operation and control of nuclear power plants are an important issue for the Asociación Nuclear Ascó-Vandellòs (ANAV). ANAV is the consortium that runs the Ascó power plants (2 units) and the Vandellòs-II power plant. The reactors are Westinghouse-design, 3-loop PWRs with an approximate electrical power of 1000 MW. The Technical University of Catalonia (UPC) thermal-hydraulic analysis team has jointly worked together with ANAV engineers at different levels in the analysis and improvement of these reactors. This article is an illustration of the usefulness of computational analysis for operational support. The contents presented were operational between 1985 and 2001 and subsequently changed slightly following various organizational adjustments. The paper has two different parts. In the first part, it describes the specific aspects of thermal-hydraulic analysis tasks related to operation and control and, in the second part, it briefly presents the results of three examples of analyses that were performed. All the presented examples are related to actual situations in which the scenarios were studied by analysts using thermal-hydraulic codes and prepared nodalizations. The paper also includes a qualitative evaluation of the benefits obtained by ANAV through thermal-hydraulic analyses aimed at supporting operation and plant control.

F. Reventós; L. Batet; C. Llopis; C. Pretel; I. Sol

2007-01-01

338

Control system for steering an extension device coupled on to an agricultural vehicle  

UK PubMed Central (United Kingdom)

The control system has a control unit, a sensor, and a vehicle hydraulic system (46). A sensor detects a status variable of the utility vehicle or of the implement and transmits a status signal to the control unit. The control unit (34) determines an operating state of the utility vehicle (12) and or of the implement. The hydraulic valve is connected hydraulically to the hydraulic system and the actuator (50). The hydraulic valve (48) is actuated as a function of the operating state of the utility vehicle and or of the implement in order to block steering of the wheel with the actuator.

HAHN KLAUS

339

Fluid transient phenomena associated with column separation in fluid power pipeline. 6th Report. Optimal valve control to suppress shocks produced in a hydraulic machine press; Ekiatsu kudo system ni okeru ekichu bunri wo tomonau ryutai kato gensho. 6. Yuatsu press no shogeki yokusei no tame no saiteki ben seigyoho  

Energy Technology Data Exchange (ETDEWEB)

A method for designing an optimal valve control is presented to suppress the shock due to the surge pressure caused by the rejoining of a separated column produced at various periods of an operations cycle of a hydraulic machine press without reducing the cycle time. In this method, the time history of the input voltage signal for the valve, which controls a certain operation period (e.g., decompression period) in an operating cycle, is assumed to be of N + 1 stage break-line mode from a specified initial value to a final one the mode being characterized by the coordinates of N break points. These points are determined by a computer program which incorporates a simulation routine for the system dynamics together with a direct search algorithm so that a minimum value of valve operation time can be achieved under the prescribed conditions of no column separation or the magnitude of surge pressure being lower than an allowable value. Experiments carried out on a small-sized model hydraulic test circuit dynamically similar to a real machine in the 20-MN class suggest that the present method is very useful for the development of a high-performance hydraulic machine press with low shock as well as with rapid operating cycle. 7 refs., 9 figs.

Shinada, M.; Kojima, E. [Kanagawa University, Kanagawa (Japan). Faculty of Engineering

1995-09-25

340

Control rod control system  

International Nuclear Information System (INIS)

[en] A system for controlling a nuclear reactor is described comprising a nuclear core comprising fissile fuel elements having openings therebetween, control rods containing a neutron absorbing material arranged throughout the core and fitting within the openings between the fuel elements. The control rods are movably insertable and withdrawable from the openings by drive means comprising linear motion apparatus having lift, movable gripper and stationary gripper solenoid coils. The control rods are arranged in groups of a predetermined number of control rods which predetermined number move together, means for directing the movement of the groups of control rods to control the core radial power distribution and the core axial power distribution and means for sharing the power circuitry among the control rod groups, the power circuitry being connected to the drive mechanism of each group of control rods, the means for sharing the power circuitry comprising storage enclosures, with one enclosure containing the power circuitry for the lift and movable gripper coils for all of the groups of control rods in combination with separate enclosures which contain the power circuitry for the stationary gripper coils for each respective group of control rods

1988-01-01

 
 
 
 
341

Control rod control system  

Energy Technology Data Exchange (ETDEWEB)

A system for controlling a nuclear reactor is described comprising a nuclear core comprising fissile fuel elements having openings therebetween, control rods containing a neutron absorbing material arranged throughout the core and fitting within the openings between the fuel elements. The control rods are movably insertable and withdrawable from the openings by drive means comprising linear motion apparatus having lift, movable gripper and stationary gripper solenoid coils. The control rods are arranged in groups of a predetermined number of control rods which predetermined number move together, means for directing the movement of the groups of control rods to control the core radial power distribution and the core axial power distribution and means for sharing the power circuitry among the control rod groups, the power circuitry being connected to the drive mechanism of each group of control rods, the means for sharing the power circuitry comprising storage enclosures, with one enclosure containing the power circuitry for the lift and movable gripper coils for all of the groups of control rods in combination with separate enclosures which contain the power circuitry for the stationary gripper coils for each respective group of control rods.

Meyer, C.E.; Cook, B.M.; Ditto, D.H.; Kaufmann, J.W.

1988-01-05

342

Thermal energy budget of hydraulic systems; Die Waermebilanz einer Hydraulikanlage  

Energy Technology Data Exchange (ETDEWEB)

The entire thermal energy loss of a hydraulic system is converted into heat, of which a large part is dissipated from the loss site via the oil. Oil, therefore, heats up the more quickly the less oil there is in the system. As the lost heat reduces the viscosity of the pressure medium, thereby increasing leakage losses and decreasing efficiency, and as, moreover, high temperatures reduce the service life of oil and seals, oil temperature must not exceed a certain level. Consequently, likely energy losses should be established already at the planning stage and adequate cooling provided for. (orig.) [German] Die gesamte Verlustleistung einer hydraulischen Anlage wird in Waerme umgesetzt, die zum grossen Teil ueber das Oel von der Verluststelle abgefuehrt wird. Dadurch wird das Oel umso schneller aufgeheizt, je kleiner das Oelvolumen in der Anlage ist. Da die Verlustwaerme die Viskositaet des Druckmediums herabsetzt und damit die Leckageverluste vergroessert und die Wirkungsgrade herabsetzt und darueber hinaus auch die Nutzungsdauer von Oel und Dichtungen durch hohe Temperaturen verringert wird, darf die Oeltemperatur gewisse obere Grenzen nicht ueberschreiten. Man muss daher moeglichst schon bei der Planung der Anlage die zu erwartende Verlustwaerme ermitteln und eine geeignete Kuehlung vorgesehen. (orig.)

Hantke, P.; Deeken, M. [Technische Hochschule Aachen (Germany). Lehrstuhl und Inst. fuer Fluidtechnische Antriebe und Steuerungen

2000-07-01

343

Thermal energy budget of hydraulic systems; Die Waermebilanz einer Hydraulikanlage  

Energy Technology Data Exchange (ETDEWEB)

The entire thermal energy loss of a hydraulic system is converted into heat, of which a large part is dissipated from the loss site via the oil. Oil, therefore, heats up the more quickly the less oil there is in the system. As the lost heat reduces the viscosity of the pressure medium, thereby increasing leakage losses and decreasing efficiency, and as, moreover, high temperatures reduce the service life of oil and seals, oil temperature must not exceed a certain level. Consequently, likely energy losses should be established already at the planning stage and adequate cooling provided for. (orig.) [Deutsch] Die gesamte Verlustleistung einer hydraulischen Anlage wird in Waerme umgesetzt, die zum grossen Teil ueber das Oel von der Verluststelle abgefuehrt wird. Dadurch wird das Oel um so schneller aufgeheizt, je kleiner das Oelvolumen in der Anlage ist. Da die Verlustwaerme die Viskositaet des Druckmediums herabsetzt und damit die Leckageverluste vergroessert und die Wirkungsgrade herabsetzt und darueber hinaus auch die Nutzungsdauer von Oel und Dichtungen durch hohe Temperaturen verringert wird, darf die Oeltemperatur gewisse obere Grenzen nicht ueberschreiten. Man muss daher moeglichst schon bei der Planung der Anlage die zu erwartende Verlustwaerme ermitteln und eine geeignete Kuehlung vorsehen. (orig.)

Hantke, P. [Technische Hochschule Aachen (Germany). Lehrstuhl und Inst. fuer Fluidtechnische Antriebe und Steuerungen

1998-12-31

344

Hydraulic/electric synergy system (HESS) design for heavy hybrid vehicles  

Energy Technology Data Exchange (ETDEWEB)

Energy storage source is one of the key factors constraining the development of hybrid drive technology. Single energy storage source is difficult to satisfy the hybrid vehicle's requirements for both energy density and power density. This paper presents a hydraulic/electric synergy system (HESS) for heavy hybrid vehicles to overcome the existing drawbacks of single energy storage source. The key components in the synergy system are sized to improve the fuel economy potential while satisfying the vehicle performance constraints. In order to achieve optimal fuel economy, energy control strategy tailored specially to the synergy system is designed to manage the power distribution between multiple energy sources based on theirs characteristics. The experiments and simulations demonstrate that the proposed synergy system can provide good fuel economy and overall system efficiency. (author)

Hui, Sun; Lifu, Yang; Junqing, Jing [Jiangsu Xuzhou Construction Machinery Research Institute, Jiangsu (China)

2010-12-15

345

Chapter 2. Mode-switching in Hydraulic Actuator Systems - An Experiment  

DEFF Research Database (Denmark)

Experiments with mode-switching adaptive control of actuators to drive a hydraulic test robot.The research is a cooperation with IT, DTU within the IMCIA Research Programme supported by the Danish Technical Research Council, STVF.

Andersen, Torben Ole; Conrad, Finn

1996-01-01

346

Engineered Barrier Systems Thermal-Hydraulic-Chemical Column Test Report  

Energy Technology Data Exchange (ETDEWEB)

The Engineered Barrier System (EBS) Thermal-Hydraulic-Chemical (THC) Column Tests provide data needed for model validation. The EBS Degradation, Flow, and Transport Process Modeling Report (PMR) will be based on supporting models for in-drift THC coupled processes, and the in-drift physical and chemical environment. These models describe the complex chemical interaction of EBS materials, including granular materials, with the thermal and hydrologic conditions that will be present in the repository emplacement drifts. Of particular interest are the coupled processes that result in mineral and salt dissolution/precipitation in the EBS environment. Test data are needed for thermal, hydrologic, and geochemical model validation and to support selection of introduced materials (CRWMS M&O 1999c). These column tests evaluated granular crushed tuff as potential invert ballast or backfill material, under accelerated thermal and hydrologic environments. The objectives of the THC column testing are to: (1) Characterize THC coupled processes that could affect performance of EBS components, particularly the magnitude of permeability reduction (increases or decreases), the nature of minerals produced, and chemical fractionation (i.e., concentrative separation of salts and minerals due to boiling-point elevation). (2) Generate data for validating THC predictive models that will support the EBS Degradation, Flow, and Transport PMR, Rev. 01.

W.E. Lowry

2001-12-13

347

Engineered Barrier System Thermal-Hydraulic-Chemical Column Test Report  

International Nuclear Information System (INIS)

The Engineered Barrier System (EBS) Thermal-Hydraulic-Chemical (THC) Column Tests provide data needed for model validation. The EBS Degradation, Flow, and Transport Process Modeling Report (PMR) will be based on supporting models for in-drift THC coupled processes, and the in-drift physical and chemical environment. These models describe the complex chemical interaction of EBS materials, including granular materials, with the thermal and hydrologic conditions that will be present in the repository emplacement drifts. Of particular interest are the coupled processes that result in mineral and salt dissolution/precipitation in the EBS environment. Test data are needed for thermal, hydrologic, and geochemical model validation and to support selection of introduced materials (CRWMS M and O 1999c). These column tests evaluated granular crushed tuff as potential invert ballast or backfill material, under accelerated thermal and hydrologic environments. The objectives of the THC column testing are to: (1) Characterize THC coupled processes that could affect performance of EBS components, particularly the magnitude of permeability reduction (increases or decreases), the nature of minerals produced, and chemical fractionation (i.e., concentrative separation of salts and minerals due to boiling-point elevation). (2) Generate data for validating THC predictive models that will support the EBS Degradation, Flow, and Transport PMR, Rev. 01.

2001-01-01

348

SUPPORT DEVICE FOR PERSONS, FOR EXAMPLE A HOSPITAL BED, PROVIDED WITH A HYDRAULIC SYSTEM  

UK PubMed Central (United Kingdom)

A support device for persons, such as a bed, treatment or operating table, chair, comprises:-a frame-a first and a second movable member, which movable members can be adjusted independently of one another and which are designed to support the person or one or more parts of the person in various positions, and-a hydraulic system for adjusting the movable members, the hydraulic system comprising:-a reservoir for hydraulic liquid-a first and a second hydraulic actuator associated with the first and second movable member, respectively, which hydraulic actuators can each be moved in two directions-a hydraulic pump-a pump activating member which is operatively connected to the pump in order for an operator to activate the pump-a valve assembly which is provided in the hydraulic circuit between the pump and the respective actuators, and-a valve assembly operating member which can be mechanically operated by an operator and is mechanically connected to the valve assembly for selecting and providing a connection between one of the actuators and the pump in order to be able to selectively move a movable member by supplying pressurized hydraulic liquid to the associated actuator upon activation of the pump.

BEUMER JAN ALBERTUS

349

Hydraulic and thermal performance assessment of cooling water systems at E.I. Hatch Nuclear Plant  

International Nuclear Information System (INIS)

[en] In July, 1989, the U. S. Nuclear Regulatory Commission issued Generic Letter 89-13, open-quotes Service Water Problems Affecting Safety-Related Equipmentclose quotes. The Generic Letter was issued because of observed operating problems with corrosion, erosion, biological fouling, silting, and protective coating failure in safety-related heat exchangers and associated cooling water piping at several nuclear power plants. The NRC required that utilities with operating nuclear plants establish a plan for comprehensive evaluation of their open cycle Service Water Systems, including: ongoing surveillance and control; testing of safety-related heat exchangers to verify heat transfer capability; inspection and maintenance of piping and water-cooled heat exchangers; confirmation that the service water system is capable of performing its intended function in accordance with the plant design basis; confirmation that maintenance and operating practices, emergency procedures, and training are adequate to ensure that safety-related equipment will perform as intended. As an integral part of the Georgia Power Company response to the Generic Letter, a personal computer-based hydraulic flow model was developed for the Plant Service Water Systems (PSW) on both units of the E. I. Hatch Nuclear Plant (HNP). The Bechtel-developed BALANCE program and PLANTSIM option were selected for this effort. Bechtel's hydraulic network computer program was developed and used successfully for flow balancing at the Limerick Generating Station during initial plant startup. The BALANCE hydraulic network model provides an accurate analytical representation of the Hatch Plant Service Water System on each unit. A summary of program capabilities and modeling assumptions, as well as observations which have been made by comparison of program predictions with test results, is presented here

1993-01-01

350

An accurate method for calculation of non-steady instantaneous flow rate of a hydraulic systems  

Energy Technology Data Exchange (ETDEWEB)

Based on the model of the distribution parameters of a non-steady flow hydraulic system, a model for accurately calculating the non-steady instantaneous flow is established, which is determined by the pressure signals in a transitional state of the hydraulic system. A group of parameters for the calculation are also given. A new method is provided for calculating accurately and quickly the rules of variation of non-steady instantaneous flow of a hydraulic system. 3 refs., 4 figs., 1 tab.

Liu, J. [Central Coal Mining Research Institute (China). Beijing Research Institute of Mine Construction

1996-08-01

351

French code system for a sodium cooled LMR inter-assembly thermal hydraulic analysis  

International Nuclear Information System (INIS)

Sodium cooled LMR core is generally comprised of many ducted assemblies which have no flow exchanges between them. So, the required flow to each assembly corresponding to its power has to be allocated in thermal hydraulic design. Flow allocation facility, which is called orifice, is used for this purpose in an LMR core. In this context, flow grouping, assembly subchannel analysis and inter-assembly flow analysis have to be done in the LMR core thermal hydraulic design and analysis. This report describes this sodium cooled LMR core thermal hydraulic design procedure, in which are flow grouping, subchannel analysis and inter-assembly whole core analysis. And the French whole core analysis code system is described which is used for the domestic whole core thermal hydraulic analysis code system development. Firstly, sodium cooled LMR core thermal hydraulic conceptual design and analysis procedure is explained in chapter 2. Chapter 3 overviews the necessity and methodology of the whole core thermal hydraulic analysis, and the French whole core analysis system is described in chapter 4. Chapter 5 describes the domestic plan of the inter-assembly thermal hydraulic analysis system, and chapter 6 shows the conclusion and the future works

2005-01-01

352

Hydraulic turbines  

International Nuclear Information System (INIS)

[en] The hydraulic turbines are defined according to the specific speed, in impulse turbines and in reaction turbines. Currently, the Pelton turbines (of impulse) and the Francis and Kaplan turbines (of reaction), they are the most important machines in the hydroelectric generation. The hydraulic turbines are capable of generating in short times, large powers, from its loads zero until the total load and reject the load instantly without producing damages in the operation. When the hydraulic resources are important, the hydraulic turbines are converted in the axle of the electric system. Its combination with thermoelectric generation systems, it allow the continuing supply of the variations in demand of energy system. The available hydraulic resource in Colombia is of 93085 MW, of which solely 9% is exploited, become 79% of all the electrical country generation, 21% remaining is provided by means of the thermoelectric generation

1998-01-01

353

Global stabilization of large-scale hydraulic networks with quantized and positive proportional controls  

DEFF Research Database (Denmark)

The problem considered here is output regulation of a large-scale hydraulic network where the structure of the network is subject to change and where the actuation is subject to a non-negativity constraint. Previous results have shown that semi-global practical output regulation is achievable using a set of decentralised, logarithmic quantised and constrained control actions with properly designed quantisation parameters. That is, an attractor set with a compact basin of attraction exists. Subsequently, the basin can be increased by increasing the control gains. In our work, this result is extended by showing that an attractor set with a global basin of attraction exists for arbitrary values of positive control gains, given that the upper level of the quantiser is properly designed. Furthermore, the proof is given for general monotone quantisation maps. Since the basin of attraction is global and the result is independent on the size of the network, this shows that structural changes can be implemented without destabilising the closed-loop system.

Jensen, Tom NØrgaard; Wisniewski, Rafal

2013-01-01

354

Decoupling analysis for a powertrain mounting system with a combination of hydraulic mounts  

Science.gov (United States)

The existing torque roll axis(TRA) decoupling theories for a powertrain mounting system assume that the stiffness and viscous damping properties are constant. However, real-life mounts exhibit considerable spectrally varying stiffness and damping characteristics, and the influence of the spectrally-varying properties of the hydraulic mounts on the powertrain system cannot be ignored. To overcome the deficiency, an analytical quasi-linear model of the hydraulic mount and the coupled properties of the powertrain and hydraulic mounts system are formulated. The influence of the hydraulic mounts on the TRA decoupling of a powertrain system is analytically examined in terms of eigensolutions, frequency, and impulse responses, and then a new analytical axiom is proposed based on the TRA decoupling indices. With the experimental setup of a fixed decoupler hydraulic mount in the context of non-resonant dynamic stiffness testing procedure, the quasi-linear model of the hydraulic mount is verified by comparing the predictions with the measurement. And the quasi-linear formulation of the coupled system is also verified by comparing the frequency responses with the numerical results obtained by the direct inversion method. Finally, the mounting system with a combination of hydraulic mounts is redesigned in terms of the stiffness, damping and mount locations by satisfying the new axiom. The frequency and time domain results of the redesigned system demonstrate that the torque roll axis of the redesigned powertrain mounting system is indeed decoupled in the presence of hydraulic mounts (given oscillating torque or impulsive torque excitation). The proposed research provides an important basis and method for the research on a powertrain system with spectrally-varying mount properties, especially for the TRA decoupling.

Hu, Jinfang; Chen, Wuwei; Huang, He

2013-07-01

355

An adaptive fuzzy dead-zone compensation scheme and its application to electro-hydraulic systems  

Scientific Electronic Library Online (English)

Full Text Available Abstract in english The dead-zone is one of the most common hard nonlinearities in industrial actuators and its presence may drastically compromise control systems stability and performance. Due to the possibility to express specialist knowledge in an algorithmic manner, fuzzy logic has been largely employed in the last decades to both control and identification of uncertain dynamical systems. In spite of the simplicity of this heuristic approach, in some situations a more rigorous mathemati (more) cal treatment of the problem is required. In this work, an adaptive fuzzy controller is proposed for nonlinear systems subject to dead-zone input. The boundedness of all closed-loop signals and the convergence properties of the tracking error are proven using Lyapunov stability theory and Barbalat's lemma. An application of this adaptive fuzzy scheme to an electro-hydraulic servo-system is introduced to illustrate the controller design method. Numerical results are also presented in order to demonstrate the control system performance.

Bessa, Wallace M.; Dutra, Max S.; Kreuzer, Edwin

2010-03-01

356

Parameter estimation and failure detection of hydraulic system; Yuatsu system no parameter suitei to kosho hakken  

Energy Technology Data Exchange (ETDEWEB)

This piper concerns estimation of system parameters in a hydraulic system and figuring out the variety of the failures. The system is assumed to be disturbed and its parameters are estimated using the Extended Kalman Filter (EKF). The hydraulic system consists of a pump, a pressure regulator, pipes and an accumulator and is modeled with nonlinear differential equations. The parameters of the model are extended to the state variables and then are estimated with EKF. Since the parameters have a correlation with the failures, the variety of failures can be figured out by observing the parameters. The proposed methodology showed its effectiveness through an experiment of internal leakage in the pump and the pipe. The leakage magnitude could be expected from the magnitude change of the estimated parameter. (author)

Park, H.

1999-11-15

357

Use of separate-effects experiments in verification of system thermal-hydraulics  

International Nuclear Information System (INIS)

[en] In recent years, a number of advanced, best-estimate systems codes such as TRAC and RELAP5 have been developed in order to accurately predict the consequences of various postulated accidents and transients in Light Water Reactor (LWR) systems. Although these codes had to go through some verification or assessment during the developmental stage, it has been recognized that an independent assessment of these codes is necessary before they should be applied to any decision making process. The USNRC is, therefore, sponsoring such efforts at several national laboratories including BNL. The overall assessment matrix includes separate-effects, integral and plant tests. However, this paper will focus on how the separate-effects tests can be utilized in verifying the thermal-hydraulic models that control the various stages of postulated accidents and/or transients in a LWR system

1982-06-11

358

Use of separate-effects experiments in verification of system thermal-hydraulics  

Energy Technology Data Exchange (ETDEWEB)

In recent years, a number of advanced, best-estimate systems codes such as TRAC and RELAP5 have been developed in order to accurately predict the consequences of various postulated accidents and transients in Light Water Reactor (LWR) systems. Although these codes had to go through some verification or assessment during the developmental stage, it has been recognized that an independent assessment of these codes is necessary before they should be applied to any decision making process. The USNRC is, therefore, sponsoring such efforts at several national laboratories including BNL. The overall assessment matrix includes separate-effects, integral and plant tests. However, this paper will focus on how the separate-effects tests can be utilized in verifying the thermal-hydraulic models that control the various stages of postulated accidents and/or transients in a LWR system.

Saha, P.

1982-01-01

359

Visual and intelligent transients and accidents analyzer based on thermal-hydraulic system code  

International Nuclear Information System (INIS)

Full text of publication follows: Many thermal-hydraulic system codes were developed in the past twenty years, such as RELAP5, RETRAN, ATHLET, etc. Because of their general and advanced features in thermal-hydraulic computation, they are widely used in the world to analyze transients and accidents. But there are following disadvantages for most of these original thermal-hydraulic system codes. Firstly, because models are built through input decks, so the input files are complex and non-figurative, and the style of input decks is various for different users and models. Secondly, results are shown in off-line data file form. It is not convenient for analysts who may pay more attention to dynamic parameters trend and changing. Thirdly, there are few interfaces with other program in these original thermal-hydraulic system codes. This restricts the codes expanding. The subject of this paper is to develop a powerful analyzer based on these thermal-hydraulic system codes to analyze transients and accidents more simply, accurately and fleetly. Firstly, modeling is visual and intelligent. Users build the thermalhydraulic system model using component objects according to their needs, and it is not necessary for them to face bald input decks. The style of input decks created automatically by the analyzer is unified and can be accepted easily by other people. Secondly, parameters concerned by analyst can be dynamically communicated to show or even change. Thirdly, the analyzer provide interface with other programs for the thermal-hydraulic system code. Thus parallel computation between thermal-hydraulic system code and other programs become possible. In conclusion, through visual and intelligent method, the analyzer based on general and advanced thermal-hydraulic system codes can be used to analysis transients and accidents more effectively. The main purpose of this paper is to present developmental activities, assessment and application results of the visual and intelligent analyzer. (authors)

2005-01-01

360

Visual and intelligent transients and accidents analyzer based on thermal-hydraulic system code  

Energy Technology Data Exchange (ETDEWEB)

Full text of publication follows: Many thermal-hydraulic system codes were developed in the past twenty years, such as RELAP5, RETRAN, ATHLET, etc. Because of their general and advanced features in thermal-hydraulic computation, they are widely used in the world to analyze transients and accidents. But there are following disadvantages for most of these original thermal-hydraulic system codes. Firstly, because models are built through input decks, so the input files are complex and non-figurative, and the style of input decks is various for different users and models. Secondly, results are shown in off-line data file form. It is not convenient for analysts who may pay more attention to dynamic parameters trend and changing. Thirdly, there are few interfaces with other program in these original thermal-hydraulic system codes. This restricts the codes expanding. The subject of this paper is to develop a powerful analyzer based on these thermal-hydraulic system codes to analyze transients and accidents more simply, accurately and fleetly. Firstly, modeling is visual and intelligent. Users build the thermalhydraulic system model using component objects according to their needs, and it is not necessary for them to face bald input decks. The style of input decks created automatically by the analyzer is unified and can be accepted easily by other people. Secondly, parameters concerned by analyst can be dynamically communicated to show or even change. Thirdly, the analyzer provide interface with other programs for the thermal-hydraulic system code. Thus parallel computation between thermal-hydraulic system code and other programs become possible. In conclusion, through visual and intelligent method, the analyzer based on general and advanced thermal-hydraulic system codes can be used to analysis transients and accidents more effectively. The main purpose of this paper is to present developmental activities, assessment and application results of the visual and intelligent analyzer. (authors)

Meng Lin; Rui Hu; Yun Su; Ronghua Zhang; Yanhua Yang [Department of Nuclear Science and System Engineering (NSSE), Shanghai Jiaotong University, Shanghai 200030 (China)

2005-07-01

 
 
 
 
361

Coupled 3D hydrodynamic models for submarine outfalls. Denvironmental hydraulic design and control of multiport diffusers  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The book describes the hydraulic design and environmental impact prediction technologies for such installations. Focus are the hydrodynamics approached by computer models. First, a multiport diffuser design program was developed. Second, two model systems for discharge analysis, CORMIX for the nea...

Bleninger, Tobias

362

Multi-parameter monitoring system for hydraulic fluids; Multi-Parameter Monitoring System fuer Hydraulische Fluessigkeiten  

Energy Technology Data Exchange (ETDEWEB)

A miniaturised sensor system for aviation hydraulic fluids is presented. The system consists of an optochemical sensor and a particle sensor. The optochemical sensor detects the form of the O-H absorption feature around 3500 cm{sup -1} to reveal the water and acid contamination in the fluid. The particle sensor uses a light barrier principle to derive its particle contamination number. (orig.)

Paul, Sumit; Legner, Wolfgang; Hackner, Angelika; Mueller, Gerhard [EADS Innovation Works, Muenchen (Germany). Bereich Sensors, Electronics and Systems Integration; Baumbach, Volker [Airbus Operations GmbH, Bremen (Germany). Bereich Hydraulic Performance and Integrity

2011-07-01

363

Characteristics of hydraulic drive. Yuatsu kudo no tokucho  

Energy Technology Data Exchange (ETDEWEB)

This paper summarizes hydraulic drive systems. The hydraulic drive system is a centralizing and dispersing system that receives power from an engine or an electric motor, generates drive force concentratedly using a hydraulic pump, and distributes the force to actuators. Its handicap is to go through one more additional step than in electric drive systems. The hydraulic motor has energy density one order higher than electric motors. With regard to energy efficiency, the electric drive system consumes less energy generally for robots that perform works with identical specifications. Driving a large load with the hydraulic system kills good responsiveness of the system because of compressibility of fluid. The hydraulic system has larger harmonic vibration, non-linearity, and parameter variation, hence its control is somewhat coarse. No control algorithms have been established for hydraulic systems. Noise, cleanliness, and maintainability are also inferior in the hydraulic systems. This paper also introduces changes from electric systems to hydraulic system for control under steel rolling pressures, hydraulic elevators in low floor buildings, and hydraulically operated breakers in electric power systems. Creative challenges to developing hydraulic technologies are wanted. 7 figs., 4 tabs.

Ichiryu, K. (Hitachi Construction Machinery Co. Ltd., Tokyo (Japan))

1993-07-15

364

Development of MARS for multi-dimensional and multi-purpose thermal-hydraulic system analysis  

International Nuclear Information System (INIS)

MARS (Multi-dimensional Analysis of Reactor Safety) code is being developed by KAERI for the realistic thermal-hydraulic simulation of light water reactor system transients. MARS 1.4 has been developed as a final version of basic code frame for the multi-dimensional analysis of system thermal-hydraulics. Since MARS 1.3, MARS 1.4 has been improved to have the enhanced code capability and user friendliness through the unification of input/output features, code models and code functions, and through the code modernization. Further improvements of thermal-hydraulic models, numerical method and user friendliness are being carried out for the enhanced code accuracy. As a multi-purpose safety analysis code system, a coupled analysis system, MARS/MASTER/CONTEMPT, has been developed using multiple DLL (Dynamic Link Library) techniques of Windows system. This code system enables the coupled, that is, more realistic analysis of multi-dimensional thermal-hydraulics (MARS 2.0), three-dimensional core kinetics (MASTER) and containment thermal-hydraulics (CONTEMPT). This paper discusses the MARS development program, and the developmental progress of the MARS 1.4 and the MARS/MASTER/CONTEMPT focusing on major features of the codes and their verification. It also discusses thermal hydraulic models and new code features under development. (author)

2000-01-01

365

RESEARCH ON HYDRAULIC SERVO AMPLIFIERS USED IN MARINE SYSTEMS  

Directory of Open Access Journals (Sweden)

Full Text Available This paper presents numerical simulations for the mecano-hydraulic servoamplifier with a special kind of distributor. This distributor has different covering for the admission and evacuation flow. The purpose of this kind of distributor is to diminuate the high frequency auto-oscillations of the servoamplifier.

Ali BEAZIT; Gheorghe SAMOILESCU; Sander CALISAL; Adriana SPORIS

2010-01-01

366

Control and modeling of fluid leakoff during hydraulic fracturing  

Energy Technology Data Exchange (ETDEWEB)

This work examines the variability in fluid leak-off rates measured under static and dynamic conditions. Laboratory generated data is compared to field measured data, and the conditions under which static and dynamic data should be used for frac design are examined. The control of fluid leak-off in both the low permeability matrix and highly permeable natural fractures is examined on formation cores under a variety of conditions. An evaluation of the mechanism of control offered by various fluid loss additives is conducted by examining the fluid-matrix and fluid-filter cake interactions. 30 references.

Penny, G.S.; Conway, M.W.; Lee, W.S.

1984-01-01

367

Control and modeling of fluid leakoff during hydraulic fracturing  

Energy Technology Data Exchange (ETDEWEB)

This work examines the variability in fluid leakoff rates measured under static and dynamic conditions. Laboratory-generated data are compared to field-measured data, and the conditions under which static and dynamic data should be used for fracture design are examined. Control of fluid leakoff in both the low-permeability matrix and highly permeable natural fractures is examined on formation cores under a variety of conditions. The control mechanism offered by various fluid-loss additives is evaluated by examining the fluid-matrix and fluid-filtercake interactions.

Penny, G.S.; Conway, M.W.; Lee, W.

1985-06-01

368

Hydraulic-turbine control is simple for small power production  

Energy Technology Data Exchange (ETDEWEB)

Exact speed regulation needed at utility hydro plants is unnecessary when turbine/generator is merely supplementing power to the main grid. Control of two basic types of generator - induction or synchronous - is described. The advantages of each of them are pointed out. Safety precautions to be taken are indicated.

Shafer, L.

1982-08-01

369

Hydraulic power generation system for Shin-Uchikawa No. 2 power station, Public Utilities Department, The city of Kanazawa  

Energy Technology Data Exchange (ETDEWEB)

Water turbine, generator and control equipment of the hydraulic power generation system were outlined, which was installed in the Shin-Uchikawa No.2 power station, Kanazawa City. The power station was featured by no spillway to reduce construction costs, and the facilities by oilless or waterless bearings to save maintenance labors. Oilless electric servomotor was introduced for the water turbine guide vane, an electro-magnetic brake for the generator to simplify hydraulic and compressed air systems, and air-cooled main bearings for the generator. Because of no spillway, a discharge valve was continuously controlled regardless of operation. Water turbine specification: Horizontal shaft single runner single discharge spiral Francis type, Water volume; 3.70m{sup 3}/s, Head; 100.6m. Generator specification: Brushless excitation three phase ac synchronous type, Output; 3.200kVA, Voltage; 6.6kV, Revolution speed; 720rpm. 3 figs., 2 tabs.

Hagino, Mitsutoshi; Shikama, Akira; Shibata, Naotoshi (Ebara Corp., Tokyo (Japan); Meidensha Electric Mfg. Co., Ltd., Tokyo (Japan))

1989-04-25

370

Application of flow network models of SINDA/FLUINTTM to a nuclear power plant system thermal hydraulic code  

International Nuclear Information System (INIS)

In order to enhance the dynamic and interactive simulation capability of a system thermal hydraulic code for nuclear power plant, applicability of flow network models in SINDA/FLUINTTM has been tested by modeling feedwater system and coupling to DSNP which is one of a system thermal hydraulic simulation code for a pressurized heavy water reactor. The feedwater system is selected since it is one of the most important balance of plant systems with a potential to greatly affect the behavior of nuclear steam supply system. The flow network model of this feedwater system consists of condenser, condensate pumps, low and high pressure heaters, deaerator, feedwater pumps, and control valves. This complicated flow network is modeled and coupled to DSNP and it is tested for several normal and abnormal transient conditions such turbine load maneuvering, turbine trip, and loss of class IV power. The results show reasonable behavior of the coupled code and also gives a good dynamic and interactive simulation capabilities for the several mild transient conditions. It has been found that coupling system thermal hydraulic code with a flow network code is a proper way of upgrading simulation capability of DSNP to mature nuclear plant analyzer (NPA).

1998-01-01

371

Application of flow network models of SINDA/FLUINT{sup TM} to a nuclear power plant system thermal hydraulic code  

Energy Technology Data Exchange (ETDEWEB)

In order to enhance the dynamic and interactive simulation capability of a system thermal hydraulic code for nuclear power plant, applicability of flow network models in SINDA/FLUINT{sup TM} has been tested by modeling feedwater system and coupling to DSNP which is one of a system thermal hydraulic simulation code for a pressurized heavy water reactor. The feedwater system is selected since it is one of the most important balance of plant systems with a potential to greatly affect the behavior of nuclear steam supply system. The flow network model of this feedwater system consists of condenser, condensate pumps, low and high pressure heaters, deaerator, feedwater pumps, and control valves. This complicated flow network is modeled and coupled to DSNP and it is tested for several normal and abnormal transient conditions such turbine load maneuvering, turbine trip, and loss of class IV power. The results show reasonable behavior of the coupled code and also gives a good dynamic and interactive simulation capabilities for the several mild transient conditions. It has been found that coupling system thermal hydraulic code with a flow network code is a proper way of upgrading simulation capability of DSNP to mature nuclear plant analyzer (NPA). 5 refs., 10 figs. (Author)

Chung, Ji Bum [Institute for Advanced Engineering, Yongin (Korea, Republic of); Park, Jong Woon [Korea Electric Power Research Institute, Taejon (Korea, Republic of)

1998-12-31

372

Discrete Displacement Hydraulic Power Take-Off System for the Wavestar Wave Energy Converter  

DEFF Research Database (Denmark)

The Wavestar Wave Energy Converter (WEC) is a multiple absorber concept, consisting of 20 hemisphere shaped floats attached to a single platform. The heart of the Wavestar WEC is the Power Take-Off (PTO) system, converting the wave induced motion of the floats into a steady power output to the grid. In the present work, a PTO based on a novel discrete displacement fluid power technology is explored for the Wavestar WEC. Absorption of power from the floats is performed by hydraulic cylinders, supplying power to a common fixed pressure system with accumulators for energy smoothing. The stored pressure energy is converted into electricity at a steady pace by hydraulic motors and generators. The storage, thereby, decouples the complicated process of wave power absorption from power generation. The core for enabling this PTO technology is implementing a near loss-free force control of the energy absorbing cylinders. This is achieved by using special multi-chambered cylinders, where the different chambers may be connected to the available system pressures using fast on/off valves. Resultantly, a Discrete Displacement Cylinder (DDC) is created, allowing near loss free discrete force control. This paper presents a complete PTO system for a 20 float Wavestar based on the DDC. The WEC and PTO is rigorously modeled from incident waves to the electric output to the grid. The resulting model of +600 states is simulated in different irregular seas, showing that power conversion efficiencies above 70% from input power to electrical power is achievable for all relevant sea conditions.

Hansen, Rico Hjerm; Kramer, Morten

2013-01-01

373

Discrete Displacement Hydraulic Power Take-Off System for the Wavestar Wave Energy Converter  

Directory of Open Access Journals (Sweden)

Full Text Available The Wavestar Wave Energy Converter (WEC) is a multiple absorber concept, consisting of 20 hemisphere shaped floats attached to a single platform. The heart of the Wavestar WEC is the Power Take-Off (PTO) system, converting the wave induced motion of the floats into a steady power output to the grid. In the present work, a PTO based on a novel discrete displacement fluid power technology is explored for the Wavestar WEC. Absorption of power from the floats is performed by hydraulic cylinders, supplying power to a common fixed pressure system with accumulators for energy smoothing. The stored pressure energy is converted into electricity at a steady pace by hydraulic motors and generators. The storage, thereby, decouples the complicated process of wave power absorption from power generation. The core for enabling this PTO technology is implementing a near loss-free force control of the energy absorbing cylinders. This is achieved by using special multi-chambered cylinders, where the different chambers may be connected to the available system pressures using fast on/off valves. Resultantly, a Discrete Displacement Cylinder (DDC) is created, allowing near loss free discrete force control. This paper presents a complete PTO system for a 20 float Wavestar based on the DDC. The WEC and PTO is rigorously modeled from incident waves to the electric output to the grid. The resulting model of +600 states is simulated in different irregular seas, showing that power conversion efficiencies above 70% from input power to electrical power is achievable for all relevant sea conditions.

Rico H. Hansen; Morten M. Kramer; Enrique Vidal

2013-01-01

374

Comparison between InfoWorks hydraulic results and a physical model of an urban drainage system.  

UK PubMed Central (United Kingdom)

Urban drainage systems are frequently analysed using hydraulic modelling software packages such as InfoWorks CS or MIKE-Urban. The use of such modelling tools allows the evaluation of sewer capacity and the likelihood and impact of pluvial flood events. Models can also be used to plan major investments such as increasing storage capacity or the implementation of sustainable urban drainage systems. In spite of their widespread use, when applied to flooding the results of hydraulic models are rarely compared with field or laboratory (i.e. physical modelling) data. This is largely due to the time and expense required to collect reliable empirical data sets. This paper describes a laboratory facility which will enable an urban flood model to be verified and generic approaches to be built. Results are presented from the first phase of testing, which compares the sub-surface hydraulic performance of a physical scale model of a sewer network in Yorkshire, UK, with downscaled results from a calibrated 1D InfoWorks hydraulic model of the site. A variety of real rainfall events measured in the catchment over a period of 15 months (April 2008-June 2009) have been both hydraulically modelled and reproduced in the physical model. In most cases a comparison of flow hydrographs generated in both hydraulic and physical models shows good agreement in terms of velocities which pass through the system.

Rubinato M; Shucksmith J; Saul AJ; Shepherd W

2013-01-01

375

Comparison between InfoWorks hydraulic results and a physical model of an urban drainage system.  

Science.gov (United States)

Urban drainage systems are frequently analysed using hydraulic modelling software packages such as InfoWorks CS or MIKE-Urban. The use of such modelling tools allows the evaluation of sewer capacity and the likelihood and impact of pluvial flood events. Models can also be used to plan major investments such as increasing storage capacity or the implementation of sustainable urban drainage systems. In spite of their widespread use, when applied to flooding the results of hydraulic models are rarely compared with field or laboratory (i.e. physical modelling) data. This is largely due to the time and expense required to collect reliable empirical data sets. This paper describes a laboratory facility which will enable an urban flood model to be verified and generic approaches to be built. Results are presented from the first phase of testing, which compares the sub-surface hydraulic performance of a physical scale model of a sewer network in Yorkshire, UK, with downscaled results from a calibrated 1D InfoWorks hydraulic model of the site. A variety of real rainfall events measured in the catchment over a period of 15 months (April 2008-June 2009) have been both hydraulically modelled and reproduced in the physical model. In most cases a comparison of flow hydrographs generated in both hydraulic and physical models shows good agreement in terms of velocities which pass through the system. PMID:23863430

Rubinato, Matteo; Shucksmith, James; Saul, Adrian J; Shepherd, Will

2013-01-01

376

Steam-Hydraulic Turbines Load Frequency Controller Based on Fuzzy Logic Control  

Directory of Open Access Journals (Sweden)

Full Text Available This study investigates an application of the fuzzy logic technique for designing the load-frequency control system to damp the frequency and tie line power oscillations due to different load disturbances under the governor deadzones and GRC non-linearity. Integral controller are designed and compared with the proposed fuzzy logic controller. To validate the effectiveness of the proposed controller, two-area load frequency power system is simulated over a wide range of operating conditions and system parameter changes. Further, comparative studies between the conventional PID control and proposed efficient fuzzy logic load frequency control are included on the simulation results. Programs Matlab software are developed for simulation. The digital results prove the power of the present fuzzy load-frequency controller over the conventional. PID controller in terms of fast response with less overshoot and small settling time.

Ali M. Yousef; Jabril A.Khamaj; Ahmad Said Oshaba

2012-01-01

377

Electronically-controlled, adaptive automatic transmission system  

Energy Technology Data Exchange (ETDEWEB)

This patent describes a control system in an automatic transmission having a plurality of gears for transmitting power from a prime mover to a load device over desired ranges of torque and speed, and an assembly of friction elements, with hydraulic fluid associated with the operation of the friction elements. The friction elements for selectively disengaging and engaging the gears from the prime mover. The control system for controlling the selection and engagement of the gears is used.

Leising, M.B.; Benford, H.L.; Holbrook, G.L.

1989-10-24

378

Hitch System  

UK PubMed Central (United Kingdom)

The invention relates to a hitch system for an agricultural vehicle for lifting and lowering a load or an attachment. The hitch system further includes a hydraulic system with a double-action hydraulic cylinder, and an electronic control unit connected to the hydraulic system for controlling the hydraulic system and the pressurization of the hydraulic cylinder. The control unit controls a contact pressure for a working device as a function of a sensed load on the axle.

BITTER MARCUS

379

Hydraulic system with several stages for prestressed bolts and gudgeon pins  

International Nuclear Information System (INIS)

This invention relates to a hydraulic system to bring bolts and gudgeon pins into a prestressed state so that the nut may be tightened in this position. In the nuclear industry where it is necessary to place a large number of bolts or pins into significant prestress to ensure the closing of reactor vessel closures, several stages each comprising a piston and a cell of analogous configuration have to be superimposed in the same hydraulic stretcher. The description is given of a hydraulic prestressed bolt and gudgeon pin stretcher with several stages in which the deformations of the various components of each stage are significantly equal and of a set of several hydraulic stretchers for simultaneously prestressing multiple bolts and pins as well as the easy and simultaneous handling of this set

1975-01-01

380

Summary and evaluation of available hydraulic property data for the Hanford Site unconfined aquifer system  

Energy Technology Data Exchange (ETDEWEB)

Improving the hydrologic characterization of the Hanford Site unconfined aquifer system is one of the objectives of the Hanford Site Ground-Water Surveillance Project. To help meet this objective, hydraulic property data available for the aquifer have been compiled, mainly from reports published over the past 40 years. Most of the available hydraulic property estimates are based on constant-rate pumping tests of wells. Slug tests have also been conducted at some wells and analyzed to determine hydraulic properties. Other methods that have been used to estimate hydraulic properties of the unconfined aquifer are observations of water-level changes in response to river stage, analysis of ground-water mound formation, tracer tests, and inverse groundwater flow models.

Thorne, P.D.; Newcomer, D.R.

1992-11-01

 
 
 
 
381

Summary and evaluation of available hydraulic property data for the Hanford Site unconfined aquifer system  

International Nuclear Information System (INIS)

Improving the hydrologic characterization of the Hanford Site unconfined aquifer system is one of the objectives of the Hanford Site Ground-Water Surveillance Project. To help meet this objective, hydraulic property data available for the aquifer have been compiled, mainly from reports published over the past 40 years. Most of the available hydraulic property estimates are based on constant-rate pumping tests of wells. Slug tests have also been conducted at some wells and analyzed to determine hydraulic properties. Other methods that have been used to estimate hydraulic properties of the unconfined aquifer are observations of water-level changes in response to river stage, analysis of ground-water mound formation, tracer tests, and inverse groundwater flow models.

1992-01-01

382

Control system for an infinitely variable transmission  

Energy Technology Data Exchange (ETDEWEB)

A system is described for controlling an infinitely variable transmission for transmitting the power of an internal combustion engine through a clutch for driving a motor vehicle. The transmission comprises a drive pulley having a hydraulically shiftable disc and a hydraulic cylinder for shifting the disc, a driven pulley having a hydraulically shiftable disc and a hydraulic cylinder for operating the disc of the driven pulley, and a belt engaged with both pulleys. The system includes a pressure oil circuit having a pump for supplying pressurized oil, and a transmission ratio control valve having a spool for controlling the pressurized oil so as to move the disc of the drive pulley to change the actual transmission ratio of the transmission. The improvement in the system comprises: first means for moving the spool of the transmission ratio control valve; second means responsive to disengagement of the clutch, when speed of the vehicle is below a predetermined speed, for producing a coasting signal; third means responsive to the coasting signal for producing a drive pulley speed set signal; fourth means responsive to the drive pulley speed set signal for producing a shifting signal representing a quantity of shifting the spool of the transmission ratio control valve in upshifting direction, and fifth means responsive to the shifting signal for shifting the spool of the transmission ratio control valve in the upshifting direction via the first means thereby decreasing the drive pulley speed.

Morimoto, Y.

1987-07-21

383

Crosshole investigations - Details of the construction and operation of the hydraulic testing system  

International Nuclear Information System (INIS)

The Crosshole Programme, part of the international Stripa Project is designed to evaluate the effectiveness of various remote-sensing techniques in characterizing a rock mass around a repository. A multidisciplinary approach has been adopted in which various geophysical, mapping and hydrogeological methods are used to determine the location and characteristics of significant features in the rock. The Programme utilises six boreholes drilled in a fan array from the 360 metre level in the Stripa Mine, Sweden. The hydrogeological component of the work uses single and crosshole testing methods, including sinusoidal pressure testing, to locate fractures and characterize groundwater movement within them. Crosshole methods use packers to isolate portions of two boreholes which both intersect a significant feature in the rock mass. Hydraulic signals are generated in one isolated section and received in the other borehole. This report describes the design and operation of the computer-controlled system which automatically performs the hydrogeological tests. (authors).

1986-01-01

384

Crosshole investigations - details of the construction and operation of the hydraulic testing system  

International Nuclear Information System (INIS)

The Crosshole Programme, part of the international Stripa Project is designed to evaluate the effectiveness of various remote-sensing techniques in characterising a rock mass around a repository. A multidisciplinary approach has been adopted in which various geophysical, mapping and hydrogeological methods are used to determine the location and characteristics of significant features in the rock. The Programme utilises six boreholes drilled in a fan array from the 360 metre level in the Stripa Mine, Sweden. The hydrogeological component of the work uses single and crosshole testing methods, including sinusoidal pressure testing, to locate fractures and characterise groundwater movement within them. Crosshole methods use packers to isolate portions of two boreholes which both intersect a significant feature in the rock mass. Hydraulic signals are generated in one isolated section and received in the other borehole. This report describes the design and operation of the computer-controlled system which automatically performs the hydrogeological tests. (author) 3 refs., 13 figs

1986-01-01

385

Integrating steam turbine control with energy management systems  

Energy Technology Data Exchange (ETDEWEB)

The use of steam turbines in industrial applications to produce electrical power while supplying steam to process headers (cogeneration) is common in many plants today. To meet industrial system requirements turbine control has evolved over the years to a level of sophistication today where the many varied steam requirements can be easily accommodated with existing turbine control systems. Some of these systems are functionally described and the method of operator interface outlined. With rising fuel costs and the development of plant computer control, turbine control systems must now interface with centralized energy managment systems. The methodology for interfacing mechanical hydraulic and electro-hydraulic turbine control is functionally described.

Nock, H.T.; Wagner, J.B.; Medeiros, C.W.

1981-01-01

386

Device for detection of uncontrolled sinking of hydraulic system, particularly in connection with agricultural tractor, comprises optical or mechanical or acoustic or electronic unit, which independently detects uncontrolled sinking  

UK PubMed Central (United Kingdom)

The device comprises optical or mechanical or acoustic or electronic unit, which independently detects an uncontrolled sinking of the hydraulic system. The uncontrolled sinking is classified as fault, and this fault is reported either to the driver of the vehicle or the fault is independently corrected by engaging in the hydraulic-control.

FRIEDRICH HANS-JOSEF

387

Hydraulic peeler  

UK PubMed Central (United Kingdom)

The utility model relates to a hydraulic peeler which is a device for peeling a large animal after pre-peeled and is an auxiliary device suitable for automatic production lines of slaughtering large animals of cattle, etc. The hydraulic peeler is composed of a host machine, a hydraulic device and a cattle tying frame, wherein the host machine comprises a machine frame, a host machine trolley, a host machine drum component and a lifting table. The cattle tying frame is arranged at the upper part of the machine frame the host machine trolley is arranged on the machine frame the host machine drum component is arranged on the host machine trolley, and has a host machine drum one end of the host machine drum is provided with an oil motor and a cycloid pin wheel speed regulator. The upper part of the host machine trolley is provided with a large reciprocating oil cylinder a single-column lifting table is arranged in front of the machine frame a lifting working table is divided into a left and a right sides the single-column lifting table comprises the lifting working table, a guide post, a guide sleeve and an air cylinder, wherein the guide sleeve is arranged on the guide post. The hydraulic device has a hydraulic oil tank the upper part of the hydraulic oil tank is provided with an oil pump and a hydraulic control valve.

WANG HUIJUAN

388

46 CFR 28.405 - Hydraulic equipment.  

Science.gov (United States)

...Hydraulic equipment. (a) Each hydraulic system must be so designed and installed...operating pressure. (c) Each hydraulic system must be equipped with at least... (d) All material in a hydraulic system must be suitable for use...

2009-10-01

389

46 CFR 28.880 - Hydraulic equipment.  

Science.gov (United States)

...Hydraulic equipment. (a) Each hydraulic system must be so designed and installed...operating pressure. (c) Each hydraulic system must be equipped with at least... (d) All material in a hydraulic system must be suitable for use...

2009-10-01

390

Development study on hydraulic three-dimensional seismic isolation system applied to advanced nuclear power plant. Development study on hydraulic rocking suppression system  

International Nuclear Information System (INIS)

Three-dimensional (3D) seismic isolation devices have been developed for the base isolation system of the Fast Breeder Reactor (FBR) that is an advanced nuclear reactor power plant building. The developed seismic isolation system consists of the hydraulic type vertical springs with rocking suppression mechanism and the laminated rubber bearings for horizontal direction. The isolation performances, i.e. natural period, damping, and rocking-suppression, have already been evaluated by the technical feasibility study and performance tests on a system which consists of down-sized devices on the shaking table, but in the seismic simulation on the real size building with this system, high hydraulic pressure was generated by rocking-suppression device under an extremely large seismic motion. In this paper, it is reported the frictional characteristics on high hydraulic pressure condition from the experiments on the 1/2 size of real device. To improve the damping performance of rocking-suppression, the orifice was added to the cylinder. At first the linear seismic simulation model of the real size system was constructed and damping coefficient was optimized by using that linear model. Finally, the detailed nonlinear simulation model was constructed, and time history analysis under simultaneous horizontal and vertical seismic motion was carried out, and the damping performance of rocking-suppression device was verified. (author)

2011-01-01

391

System for controlling the pressure of oil in a system for a continuously variable transmission  

Energy Technology Data Exchange (ETDEWEB)

A control system for a continuously variable transmission for transmitting the power of an internal combustion engine to driving wheels through a clutch, having a drive pulley having a hydraulically shiftable disc and a first hydraulic cylinder for shifting the disc, a driven pulley having a hydraulically shiftable disc and a second hydraulic cylinder for operating the disc, a belt engaged with both pulleys, a line pressure control valve having ports and a spool, a transmission ratio control valve having ports and a spool, a first hydraulic circuit having a pump for supplying oil to the first cylinder through the line pressure control valve and transmission ratio control valve, the system comprising: a second hydraulic circuit for supplying oil to the line pressure control valve so as to shift the spool; control valve means provided in the second hydraulic circuit for controlling amount of oil supplied to the line pressure control valve; first means for detecting a large transmission ratio state after disengagement of the clutch and for producing a signal; second means responsive to the signal from the first means for producing a line pressure reducing signal; third means responsive to the line pressure reducing signal for operating the control valve means, so that the spool of the line pressure control valve is shifted to reduce the line pressure.

Miyawaki, M.

1987-06-23

392

Hydraulic Plant Remote Laboratory  

Digital Repository Infrastructure Vision for European Research (DRIVER)

In this paper we present a three tank hydraulic system and possibilities how it can be used for the purpose of remote laboratories. The concept of our remote laboratory is based on client – server architecture. We compare two different approaches of remote control. First one uses a Java Server appli...

Vladimir Zilka; Pavol Bisták; Peter Kurcik

393

Effects of fluid-flow velocity and water quality on planktonic and sessile microbial growth in water hydraulic system.  

Science.gov (United States)

Water hydraulic systems use water instead of oil as a pressure medium. Microbial growth in the system may restrict the applicability this technology. The effects of fluid-flow velocity and water quality on microbial growth and biofilm formation were studied with a pilot-scale water hydraulic system. The fluid-flow velocities were 1.5-5.2 m/s and the corresponding shear stresses 9.1-84 N/m2. The fluid-flow velocity had an insignificant effect on the total bacterial numbers and the numbers of viable heterotrophic bacteria in the pressure medium. Microbial attachment occurred under high shear stresses. The fluid-flow velocity did not affect the biofilm formation in the tank. Increase in the flow velocity decreased the bacterial densities on the pipe surfaces indicating preferable biofilm formation on areas with low flow velocity. Using ultrapure water as the pressure medium decreased the total cell numbers and resulted in slower growth of bacteria in the pressure medium. Lowering the nutrient concentration retarded biofilm formation but did not affect the final cell densities. The decreasing pressure medium nutrient concentration favoured microbial attachment in the tank instead of the pipelines. In conclusion, microbial growth and biofilm formation in water hydraulic systems cannot be controlled by the fluid-flow velocity or the quality of the pressure medium. PMID:12369527

Soini, S M; Koskinen, K T; Vilenius, M J; Puhakka, J A

2002-09-01

394

A conceptual model of the hydraulics of check dam for gully control  

Science.gov (United States)

Check dams have been long recognized as useful structures to minimize concentrated flow erosion