Relevant bibliographies by topics / Hydraulic control system

Academic literature on the topic 'Hydraulic control system'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Hydraulic control system"

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Ito, Masanori, and Hiroshi Sato. "DDV Control Hydraulic Steering System." JOURNAL OF THE MARINE ENGINEERING SOCIETY IN JAPAN 34, no. 3 (1999): 210–14. http://dx.doi.org/10.5988/jime1966.34.210.

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Xu, Hong. "PNEUMO-HYDRAULIC SYSTEM AND THE PNEUMATIC HYDRAULIC COMBINATION CONTROL (PHCC) SYSTEM." Chinese Journal of Mechanical Engineering 37, no. 07 (2001): 92. http://dx.doi.org/10.3901/jme.2001.07.092.

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YU, Zhuoping. "Robustness Hydraulic Pressure Control System of Integrated-electro-hydraulic Brake System." Journal of Mechanical Engineering 51, no. 16 (2015): 22. http://dx.doi.org/10.3901/jme.2015.16.022.

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Zakharov, Viacheslav, and Tatiana Minav. "Analysis of Field Oriented Control of Permanent Magnet Synchronous Motor for a Valveless Pump-Controlled Actuator." Proceedings 64, no. 1 (November 20, 2020): 19. http://dx.doi.org/10.3390/iecat2020-08491.

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Earlier research demonstrated that a pump-controlled hydraulic system combines the best properties of traditional hydraulics and electric intelligence. Thus, the new system has been proposed as a replacement for conventional valve-controlled systems, to improve the energy efficiency in non-road mobile machinery in particular. One of the pump-controlled systems can be realized via direct control of hydraulic pump/motor by varying speed of prime mover. Electric motor (EM) as a prime mover attract with higher efficiency (more than 90%) and a wide range of speed regulation. These advantages allow to improve the system efficiency and decrease the energy consumption in electric and hybrid non-road mobile machinery. Further EM's efficiency improvement can be achieved by using vector control systems, which provide rotor magnetic flux control proportionally to the shaft's speed. Considering all vector control’s benefits (high accuracy of speed control, smooth~start and smooth rotation of the motor in the entire frequency range, quick response to load changes, increased control range and accuracy of regulation), the electro-hydraulic systems and influence of electric part on hydraulic one is not investigated widely. Therefore, in this paper Field Oriented Control (FOC) is analyzed as One of the most perspective vector control systems for electro-hydraulic actuator application with a Permanent Magnet Synchronous Machine (PMSM) as a prime mover. In~this study, Direct-driven hydraulics (DDH) was considered as a study case. A detailed model of the PMSM control system with DDH was built in MATLAB/Simulink. The behavior of the DDH system was investigated by transient processes analysis of EM, pump, and cylinder in the normal and failure modes. The system demonstrates a difference between reference and simulated speed about 0.33% and 11.75% of average torque fluctuations. The behavior of the system in failure mode demonstrated multiple excesses of rated parameters.
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Zhang, Li. "Analysis of Construction Machinery Hydraulic Control System." Applied Mechanics and Materials 401-403 (September 2013): 1590–95. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.1590.

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This article analyses the use requirement of construction machinery, introduce the main features of typical construction machinery hydraulic system, derived power control modes of hydraulic system form hydraulic power form, compares the advantages and disadvantages of each power control mode, gives the optimization solutions, at last, sum up the full text of the construction machinery hydraulic power and control modes and prospect of the hydraulic system to precision control.
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Dai, Li, Yao Wu, Jian Wang, Yun Gong Li, and Yu Liu. "Modeling and Control of Flexible Hydraulic Robotic Arm." Advanced Engineering Forum 2-3 (December 2011): 334–39. http://dx.doi.org/10.4028/www.scientific.net/aef.2-3.334.

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Flexible hydraulic robotic arm is a complicated system which coupled by mechanics and hydraulics. It is widely applied in all kinds of large engineering equipments, such as concrete pump truck, bridge monitor truck, arm frame of crane, etc. The arm system of the hydraulic robotic arm is a multi-body system with redundant freedom, strong nonlinear, coupled with rigid and flexible characters. So it is of great theoretic value and real engineering significance to study the arm system of the robotic arm. In this theme, the movement of flexible hydraulic robotic arm and hydraulic cylinders are seperately analyzed with flexible multi-body dynamics, and the mechanical hydraulic dynamic model of the driving system and the arm system is built with Lagrange Equation and Virtual Work Theory. And the dynamic differential equation is built with the driving force of the hydraulic cylinder as the main force. With the track programming and the optimization method, the dynamic converse problem of the arm end track is researched, so as to get the optimized rotation angle when the arm end reaches the expected point. By using the PD control theory, without decoupling and rank-decreasing, only with feed back from the hydraulic system to realize the close loop control of the arm end position, pose and movement, the relationship between the hydraulic system and the end position & pose is studied, so that the flexible distortion is reduced and the libration is restrained. What’s more, the simulation model of the mechanical arms is built by the dynamic simulation software. The simulation result prove that the movement equation built by this way can clearly describe each dynamic character of the mechanical arms.
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Haga, Masakazu, Watanabe Hiroshi, and Kazuo Fujishima. "Digging control system for hydraulic excavator." Mechatronics 11, no. 6 (September 2001): 665–76. http://dx.doi.org/10.1016/s0957-4158(00)00043-x.

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Liu, He-ping, A.-ni Luo, and Hai-yan Xiao. "Underwater hydraulic shock shovel control system." Journal of Marine Science and Application 7, no. 2 (May 30, 2008): 139–42. http://dx.doi.org/10.1007/s11804-008-6046-0.

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Zhang, Zhu Xin, and Tuo Jia. "Direct-Drive Differential Volume Control Electro-Hydraulic Servo Control System." Applied Mechanics and Materials 433-435 (October 2013): 991–94. http://dx.doi.org/10.4028/www.scientific.net/amm.433-435.991.

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Direct-drive volume control electro-hydraulic servo control system, derivation model of single-rod hydraulic cylinder system, pointed out that when the reciprocating motion characteristics are inconsistent. In order to solve this problem, proposed direct-drive differential volume control electro-hydraulic servo system design of its control system and analysis of system models. Through theoretical analysis, validate this proposed direct-drive bad dynamic volume control system, symmetric dynamic performance, improving control system reliability.
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He, Xi Guang, Ji Feng Xing, and Jia Chen. "Permanent-Pressure Control Tactic of Rudder Based on Fuzzy-Control Theorem." Applied Mechanics and Materials 192 (July 2012): 360–64. http://dx.doi.org/10.4028/www.scientific.net/amm.192.360.

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In order to guarantee that the rudder hydraulic systems work normally, the rudder hydraulic system must supply constant-pressure fluid to it. In this article, the author had analyzed the relationship between the power of the hydraulic oil pump and its motor revs, and done researches on its controlling tactics. Next, the author deigned its controller and controlling system based on fuzzy-control theorem. This system could extend the life-span of the pump motor and save energy, and it can also be utilized in other engineering fields.
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Dissertations / Theses on the topic "Hydraulic control system"

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Kennedy, Joseph L. Fales Roger. "Force control of a hydraulic servo system." Diss., Columbia, Mo. : University of Missouri--Columbia, 2009. http://hdl.handle.net/10355/6582.

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The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Title from PDF of title page (University of Missouri--Columbia, viewed on November 18, 2009). Thesis advisor: Dr. Roger Fales. Includes bibliographical references.
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Skjong, Stian. "Modeling, Simulation and Control of Hydraulic Winch System." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-25578.

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In this thesis a hydraulic low pressure winch system has been modeled using bond graph theory. The hydraulic winch system is assumed to be installed on an offshore vessel affected by environmental forces and disturbances such as waves and currents. The hydraulic system powering the winch consists mainly of two pilot operated 3/3-directional valves controlled by two 4/3-directional valves and a hydraulic motor. The system also includes a pressure relief valve, check valves, pump systems, piping and filters. The 3/3-directional valves are the main focus in the model and are therefore modeled with less simplifications compared to the other subsystems. A thorough model study has been initiated to figure out the model limitations, sensitivity of model parameters and the ability to simplify the derived model without loosing essential dynamics and characteristics. The effects of variable bulk modulus and fluid inertia in the 3/3-directional valves have been studied by comparing different step responses and motor load characteristics. The observations and results from this model analysis laid the groundwork for control of the hydraulic motor. A clear relation between the main valve displacements and the motor velocity and torque in 4/3 valve configuration gave reasons to believe that manual motor control done by the winch operator through control of the valve displacements was possible. Adaptive PID controllers were used as inner controllers to control the control slides in the main valves. These controllers were later on replaced with PD-controllers when outer control was derived because the adaptive controllers tended to be a bit slow. Simplified state equations describing the motor dynamics were derived for control design purposes. The state equations extracted from the bond graph model showed high complexity, containing logic and discrete quantities, and were not suitable for control design. Model based speed- and torque controllers, based on sliding mode and backstepping control theory, were derived based on the simplified equations and implemented in the model. Different load cases were initiated to test the two controllers. A lumped wire-load model containing hydrodynamics, wire- and reel dynamics and environmental disturbances such as current and heave motions of the vessel were added in the total winch model to test the controllers in different operations with varying conditions and environments. The results from these controller tests gave reason to believe that a combination of these two controllers would be favourable in certain operations and would give increased safety in extreme cases such as stuck load and loss of load. The derived speed and torque controller were put into a hybrid controller framework and a switching algorithm was designed with focus on switching stability and wanted functionalities for the winch system. It was observed that switching stability and winch functionality were closely connected and different winch operations were essential in the design of the switching algorithm. Dwell time and tracking error switching were used as the main controller switching restrictions together with functionality based switching conditions. Different simulations were initiated to test the hybrid controller such as stuck load, loss of load and landing of a load at the sea floor. A Luenberger observer was derived to estimate the motor load and the motor velocity by using the simplified state equations and the differential pressure across the hydraulic motor as measurement in order to ensure redundancy in the control system and be able to control the hydraulic winch even though the decoder measuring the hydraulic motor velocity fails.
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Abdelgayed, Mohamed E. "Design and Control the Ancillary System for Hydraulic Hybrid Vehicle (HHV)." University of Toledo / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1278075678.

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Hogan, Paul Anthony. "A knowledge-based system for automated fault analysis of hydraulic systems." Thesis, University of Bath, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332776.

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Reichenwallner, Christopher, and Daniel Wasborg. "Control of a Hydraulic Hybrid System for Wheel Loaders." Thesis, Linköpings universitet, Fluida och mekatroniska system, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-158902.

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In recent years many companies have investigated the use of hybrid technology due to the potential of increasing the driveline’s efficiency and thus reducing fuel consumption. Previous studies show that hydraulic hybrid technology can be favourable to use in construction machinery such as wheel loaders, which often operate in repetitive drive cycles and have high transient power demands. Parallel as well as Series hybrid configurations are both found suitable for wheel loader applications as the hybrid configurations can decrease the dependency on the torque converter. This project has investigated a novel hydraulic hybrid concept which utilizes the wheel loaders auxiliary pump as a supplement to enable both Series and Parallel hybrid operation. Impact of accumulator sizes has also been investigated, for which smaller accumulator sizes resembles a hydrostatic transmission. The hybrid concept has been evaluated by developing a wheel loader simulation model and a control system based on a rule-based energy management strategy. Simulation results indicate improved energy efficiency of up to 18.80 % for the Combined hybrid. Moreover, the accumulator sizes prove to have less impact on the energy efficiency. A hybrid system with decreased accumulator sizes shows improved energy efficiency of up to 16.40 %.
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KRUTZ, JILL E. "DESIGN OF A HYDRAULIC ACTUATOR TEST STAND FOR NON-LINEAR ANALYSIS OF HYDRAULIC ACTUATOR SYSTEM." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin990813095.

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Votava, Marek. "Realizace řídicího systému pro hydraulický manipulátor." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228714.

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This diploma thesis concernes with the realization of a control system for hydraulic manipulator. It is devided into three main parts. The first part concerns sensors and actuators, which are used at the hydraulic manipulator. The second part describes design, production and programming of electronic control sub-system. The last part describes high level control software, created in the LabVIEW environment.
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Hochwallner, Martin. "On Motion Control of Linear Incremental Hydraulic Actuators." Doctoral thesis, Linköpings universitet, Industriell Produktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-142264.

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Linear Incremental Hydraulic Actuators combine one or more short-stroke cylinders, and two or more engaging/disengaging mechanisms into one actuator with long, medium, or even unlimited stroke length. The motion of each single short-stroke actuator concatenated by the engaging/disengaging mechanisms forms the motion of the linear incremental hydraulic actuator. The patterns of how these motions are concatenated form the gaits of a specific linear incremental hydraulic actuator. Linear incremental hydraulic actuators may have more than one gait. In an application, the gaits may be combined to achieve optimal performance at various operating points. The distinguishing characteristic of linear incremental hydraulic actuators is the incremental motion. The term incremental actuator is seen as analogous to the incremental versus absolute position sensor. Incremental actuators realize naturally relative positioning. Incremental motion means also that the behavior does not depend on an absolute position but only on the relative position within a cycle or step. Incremental actuators may realize discrete incremental or continuous incremental motion. Discrete incremental actuators can only approach discrete positions, whereby stepper drives are one prominent example. In contrast, continuous incremental actuators may approach any position. Linear electric motors are one example of continuous incremental actuators. The actuator has no inherent limitation in stroke length, as every step or cycle adds only to the state at the beginning of the step or cycle and does not depend on the absolute position. This led to the alternative working title Hydraulic Infinite Linear Actuator. Linear incremental hydraulic actuator provides long stroke, high force, and linear motion and has the potential to decrease the necessary resource usage, minimize environmental impact, e.g. from potential oil spillage, extend the range of feasible products: longer, stiffer, better, etc. This thesis presents an analysis of the characteristics and properties of linear incremental hydraulic actuators as well as the gaits and possible realizations of some gaits. The gait for continuous, smooth motion with two cylinders is comprehensively studied and a control concept for the tracking problem is proposed. The control concept encapsulates the complexity of the linear incremental hydraulic actuator so that an application does not have to deal with it. One other gait, the ballistic gait, which realizes fast, energy-efficient motion, enabling energy recuperation is studied.
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Roddis, Roge. "Evaluation of modern control system design techniques for a multivariable electro-hydraulic system." Thesis, Sheffield Hallam University, 2000. http://shura.shu.ac.uk/20288/.

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An experimental apparatus has been developed with the object of providing a test plant, based on commercially available electro-hydraulic components, for the investigation of multivariable control system design methodologies. A mathematical model has been produced for this experimental plant and a preliminary analysis of the plant carried out. A selection of controller design techniques has been investigated. Designs have been produced for two state feedback controllers in which the feedback coefficients were based on LQR theory, one of which used a full order estimator based on a Kalman Filter, the other using a reduced order observer whose poles were chosen arbitrarily. In addition, forward path compensators have been developed using the Characteristic Locus and the Hinfinity/Mixed Sensitivity methods. These controller designs were based on computations and simulations utilising Matlab and a selection of its control engineering toolboxes and Simulink. The completed designs were implemented in digital form and tested on the actual plant. A series of tests were carried out to assess the robustness of the various controllers in the presence of plant uncertainty. The physical plant was modified and the controllers based on the nominal plant model used in conjunction with this modified plant. As a design technique which enabled robustness issues to be addressed explicitly, the Hinfinity approach was used to improve the robustness of the original Hinfinity controller.
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Lu, C. "On-line self-optimisation of an electro-hydraulic servo control system." Thesis, University of Salford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381828.

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Books on the topic "Hydraulic control system"

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Prabhakar, Vinod. Digital feedback control system for canals. Berkeley, Calif: Hydraulic Engineering Laboratory, University of California, 1988.

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Wu, Yulin. Vibration of hydraulic machinery. Dordrecht: Springer, 2013.

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Wu, Yulin. Vibration of Hydraulic Machinery. Dordrecht: Springer Netherlands, 2013.

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Illinois. Division of Water Resources. Addison Creek stormwater management system evaluation: Du Page and Cook Counties, Illinois. Springfield, Ill: The Division, 1988.

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Walters, R. B. Hydraulic and electro-hydraulic control systems. 2nd ed. Dordrecht: Kluwer Academic Publishers, 2000.

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Walters, R. B. Hydraulic and electro-hydraulic control systems. London: Elsevier Applied Science, 1991.

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Walters, R. B. Hydraulic and electric-hydraulic control systems. 2nd ed. Dordrecht: Kluwer Academic, 2000.

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Walters, R. B. Hydraulic and Electric-Hydraulic Control Systems. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-015-9427-1.

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Walters, R. B. Hydraulic and Electro-Hydraulic Control Systems. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3840-6.

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Pneumatic and hydraulic systems. Oxford: Butterworth Heinemann, 1997.

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Book chapters on the topic "Hydraulic control system"

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Walters, R. B. "The Control System." In Hydraulic and Electric-Hydraulic Control Systems, 30–41. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-015-9427-1_7.

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Walters, R. B. "The Control System." In Hydraulic and Electro-Hydraulic Control Systems, 30–41. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3840-6_7.

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Walters, R. B. "System Enhancement." In Hydraulic and Electric-Hydraulic Control Systems, 179–99. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-015-9427-1_21.

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Walters, R. B. "System Enhancement." In Hydraulic and Electric-Hydraulic Control Systems, 287–89. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-015-9427-1_39.

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Walters, R. B. "System Enhancement." In Hydraulic and Electro-Hydraulic Control Systems, 179–99. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3840-6_21.

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Walters, R. B. "System Analysis of Electro-hydraulic Control Systems." In Hydraulic and Electric-Hydraulic Control Systems, 88–96. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-015-9427-1_12.

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Walters, R. B. "System Analysis of Electro-hydraulic Control Systems." In Hydraulic and Electro-Hydraulic Control Systems, 88–96. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3840-6_12.

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Walters, R. B. "Analysis of Pressure Control System." In Hydraulic and Electric-Hydraulic Control Systems, 200–208. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-015-9427-1_22.

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Walters, R. B. "Analysis of Pressure Control System." In Hydraulic and Electro-Hydraulic Control Systems, 200–208. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3840-6_22.

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Walters, R. B. "Introduction to System Analysis." In Hydraulic and Electric-Hydraulic Control Systems, 79–87. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-015-9427-1_11.

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Conference papers on the topic "Hydraulic control system"

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Sadowska, Anna, Leo Steenson, and Magnus Hedlund. "Model-Predictive Control of a Compliant Hydraulic System." In 2018 UKACC 12th International Conference on Control (CONTROL). IEEE, 2018. http://dx.doi.org/10.1109/control.2018.8516830.

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Qiankun, Ma, Wang Xuyong, Yuan Fan, Tao Jianfeng, and Liu Peng. "Research on feed-forward PIDD2control for hydraulic continuous rotation motor electro-hydraulic servo system with long pipeline." In 2016 UKACC 11th International Conference on Control (CONTROL). IEEE, 2016. http://dx.doi.org/10.1109/control.2016.7737533.

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Gao, Yuanlou, and Nan Ding. "Electro-hydraulic proportional pressure control system of hydraulic machine." In 2012 10th IEEE International Conference on Industrial Informatics (INDIN). IEEE, 2012. http://dx.doi.org/10.1109/indin.2012.6301057.

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Chiang, Yu-Lun, Jen-Chen Chuang, and Jia-Ying Tu. "Control Simulation of Hydraulic Adjustment System." In ASME 2017 Conference on Information Storage and Processing Systems collocated with the ASME 2017 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/isps2017-5452.

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Hydraulic actuation systems are widely applied in the modern industry, such as robots, excavators, vehicle suspension systems, machine tools, and testing of structural systems, because hydraulic actuation systems are able to provide with large loading capacity. However, the design parameters and control techniques related to temperature, flow volume, flow resistance, etc., affect the stable performance of hydraulic pressure and need to be concerned with. In addition, while an unexpected external loading is applied, which makes a reaction force to the hydraulic oil and results in pressure variations, advanced real-time control techniques is required, in order to maintain a high-level stability and accuracy of the output pressure. To this end, a hydraulic power system is developed in this work, which installs two proportional valves for real-time adjustment of hydraulic pressure. In this paper, the performance compensation of hydraulic pressure involves two steps of control development; the first step is to establish the mathematical model of the hydraulic adjustment system, and the second step is to simulate the pressure response of hydraulic adjustment system with controller design. In this first step, real-time dSPACE control system is utilized to implement identification work, for the purpose of establishing a multi-input/multi-output (MIMO) dynamic model of the active hydraulic adjustment system. Then, based on the dynamic model, the second step develops a feedforward-feedback and a PID controller for the active hydraulic adjustment system; the dynamic responses and control performance are verified via numerical simulation studies.
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Strode, George. "DC-X Hydraulic Flight Control System." In Aerospace Technology Conference and Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1995. http://dx.doi.org/10.4271/951994.

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West, C., S. D. Monk, A. Montazeri, and C. J. Taylor. "A Vision-Based Positioning System with Inverse Dead-Zone Control for Dual-Hydraulic Manipulators." In 2018 UKACC 12th International Conference on Control (CONTROL). IEEE, 2018. http://dx.doi.org/10.1109/control.2018.8516734.

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Zhang, Xingtian, Keqiang Liu, and Yue Zhao. "Hydraulic Control System Based on Adaptive Control Method." In 2021 IEEE Conference on Telecommunications, Optics and Computer Science (TOCS). IEEE, 2021. http://dx.doi.org/10.1109/tocs53301.2021.9688617.

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Danaee, Siavash, Jarmo Nurmi, Tatiana Minav, Jouni Mattila, and Matti Pietola. "Direct Position Control of Electro-Hydraulic Excavator." In BATH/ASME 2018 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fpmc2018-8896.

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Position measurement in the electro-hydraulic systems is feasible via the utilization of physical sensors. An improvement in technology has led to the manufacturing of high accurate position sensors for direct position control. This paper proposes utilization of direct position control in an electro-hydraulic system with a new hydraulic zonal system architecture implemented with Direct Driven Hydraulics. It was mentioned in early study that this hydraulic system architecture as a replacement for the traditional valve-based hydraulic systems, has higher energy efficiency rate. In this study, the simulation implementation and experimental verification of Direct Driven Hydraulics (DDH) will be investigated for a micro excavator test case from position control point of view. Results demonstrated that the implementation of DDH in an excavator case will lead to maximum 5 cm error in a single-cycle movement.
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Helian, Bobo, Zheng Chen, Bin Yao, Yi Yan, and Chiang Lee. "Adaptive Robust Control of a Pump Control Hydraulic System." In ASME 2017 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/dscc2017-5076.

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Pump control hydraulic systems have been widely used in industry by the advantages of no throttling loss and overflow loss as well as high power-to-volume ratio. However, the characteristics of high order dynamics, high nonlinearities and disturbances make the accurate position control of those systems very challenging. And to implement the controllers easily, some dynamics such as servo motor loop are usually ignored in most of existing methods, which may lead to the limitation of closed-loop bandwidth and disturbance rejection ability. In this paper, adaptive robust control (ARC) algorithm is utilized in a pump control electro-hydrualic system. The ARC guarantees the stability and high performance in the presence of model uncertainties and nonlinear disturbances. For the high-order of the hydraulic system, a modified three-step backstepping method is constructed which is covering the whole electro-hydraulic system. The servo motor-pump dynamics is taken into considered in the three-step adaptive backstepping controller design. Theoretical control performance based on Lyapunov functions and the simulation results proved that the control strategy this paper proposed achieved high performance in spite of the nonlinearities and uncertainties.
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Zhang, Kaihao, Xuewen Rong, Kun Yang, Yibin Li, and Hui Chai. "Hydraulic pan-tilt servo control system based on hydraulic actuator model." In 2017 Chinese Automation Congress (CAC). IEEE, 2017. http://dx.doi.org/10.1109/cac.2017.8243398.

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Reports on the topic "Hydraulic control system"

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Loh, Christopher J. An Application of a LISP Based Expert System for Failure Diagnosis of the CH-47 Flight Control Hydraulic System. Fort Belvoir, VA: Defense Technical Information Center, March 1986. http://dx.doi.org/10.21236/ada168970.

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Leoni, Paolo, and Gunnar Lennermo. Integration concepts of decentral ST systems in DHC. IEA SHC Task 55, June 2020. http://dx.doi.org/10.18777/ieashc-task55-2020-0016.

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This factsheet focuses on the integration hydraulics and control of central ST systems in DHC. The first part gives an overview of decentral feed-in: international state of the art (including comparison and selection criteria of the different integration schemes), hydraulics and components, details of the return-to-supply scheme (challenges, pump operation, control). The second part describes concepts for the secondary-side integration of ST without feed-in. The third part illustrates selected best-practice examples in Austria (Wasserwerke Andritz and Berlinerring in Graz) and Sweden (Ystad).
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Leoni, Paolo, and Jan Erik Nielsen. Integration concepts of central ST systems in DHC. IEA SHC Task 55, June 2020. http://dx.doi.org/10.18777/ieashc-task55-2020-0017.

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This factsheet focuses on the integration hydraulics and control of central ST systems in DHC. The first part gives an overview of the typical integration concepts and operating modes implemented in the state of the art. The second part illustrates general aspects of the integration of heat pumps to achieve higher shares of ST and describes recent projects: two implementation projects (Crailsheim and Salzburg-Lehen), and one feasibility study performed by the Technische Universität Dresden.
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Leech, James. Technical assessment of the Old, Mississippi, Atchafalaya, and Red (OMAR) Rivers : Red and Atchafalaya Rivers AdH model. Engineer Research and Development Center (U.S.), August 2022. http://dx.doi.org/10.21079/11681/45165.

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The Red River, Atchafalaya River, and the Old River Control Complex (ORCC) Outflow Channel Adaptive Hydraulics two-dimensional depth averaged sediment model (AdH-2D-SED) was used to evaluate the short-term and system-wide sedimentation effects of modifying the operation schedule at ORCC. The changes evaluated were increasing and decreasing the percentage of flow that is diverted to the Atchafalaya River from the Mississippi River at the ORCC and modifying the distributions through four ORCC structures. Sedimentation effects for several operation scenarios were compared to a Base condition for each water year that represented the existing operation protocols. Four dredging scenarios were developed and analyzed. Additionally, two structure options were developed and analyzed. The scenario analyses presented in this report are intended to identify large trends and to make gross assessments of the potential impacts of various proposed operational changes to the ORCC.
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Tuller, Markus, Asher Bar-Tal, Hadar Heller, and Michal Amichai. Optimization of advanced greenhouse substrates based on physicochemical characterization, numerical simulations, and tomato growth experiments. United States Department of Agriculture, January 2014. http://dx.doi.org/10.32747/2014.7600009.bard.

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Over the last decade there has been a dramatic shift in global agricultural practice. The increase in human population, especially in underdeveloped arid and semiarid regions of the world, poses unprecedented challenges to production of an adequate and economically feasible food supply to undernourished populations. Furthermore, the increased living standard in many industrial countries has created a strong demand for high-quality, out-of-season vegetables and fruits as well as for ornamentals such as cut and potted flowers and bedding plants. As a response to these imminent challenges and demands and because of a ban on methyl bromide fumigation of horticultural field soils, soilless greenhouse production systems are regaining increased worldwide attention. Though there is considerable recent empirical and theoretical research devoted to specific issues related to control and management of soilless culture production systems, a comprehensive approach that quantitatively considers all relevant physicochemical processes within the growth substrates is lacking. Moreover, it is common practice to treat soilless growth systems as static, ignoring dynamic changes of important physicochemical and hydraulic properties due to root and microbial growth that require adaptation of management practices throughout the growth period. To overcome these shortcomings, the objectives of this project were to apply thorough physicochemical characterization of commonly used greenhouse substrates in conjunction with state-of-the-art numerical modeling (HYDRUS-3D, PARSWMS) to not only optimize management practices (i.e., irrigation frequency and rates, fertigation, container size and geometry, etc.), but to also “engineer” optimal substrates by mixing organic (e.g., coconut coir) and inorganic (e.g., perlite, pumice, etc.) base substrates and modifying relevant parameters such as the particle (aggregate) size distribution. To evaluate the proposed approach under commercial production conditions, characterization and modeling efforts were accompanied by greenhouse experiments with tomatoes. The project not only yielded novel insights regarding favorable physicochemical properties of advanced greenhouse substrates, but also provided critically needed tools for control and management of containerized soilless production systems to provide a stress-free rhizosphere environment for optimal yields, while conserving valuable production resources. Numerical modeling results provided a more scientifically sound basis for the design of commercial greenhouse production trials and selection of adequate plant-specific substrates, thereby alleviating the risk of costly mistrials.
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Dick, Warren, Yona Chen, and Maurice Watson. Improving nutrient availability in alkaline coal combustion by-products amended with composted animal manures. United States Department of Agriculture, 2002. http://dx.doi.org/10.32747/2002.7587240.bard.

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Hypothesis and Objectives: We hypothesized that coal combustion products (CCPs), including those created during scrubbing of sulfur dioxide from flue gases, can be used alone or mixed with composted animal manures as effective growth media for plants. Our specific objectives were, therefore, to (1) measure the chemical, physical and hydraulic properties of source materials and prepared mixes, (2) determine the optimum design mix of CCPs and composted animal manures for growth of plants, (3) evaluate the leachate water quality and plant uptake of selected elements from prepared mixes, (4) quantify the interaction between composted animal manures and B concentrations in the mixes, (5) study the availability of P to plants growing in the mixes, and (6) determine the microbial community and siderophores involved in the solubilization of Fe and its transfer to plants. Background: In recent years a major expansion of electricity production by coal combustion has taken place in Israel, the United States and the rest of the world. As a result, a large amount of CCPs are created that include bottom ash, fly ash, flue gas desulfurization (FGD) gypsum and other combustion products. In Israel 100,000 tons of fly ash (10% of total CCPs) are produced each year and in the US a total of 123 million tons of CCPs are produced each year with 71 million tons of fly ash, 18 million tons of bottom ash and 12 million tons of FGD gypsum. Many new scrubbers are being installed and will come on-line in the next 2 to 10 years and this will greatly expand the amount of FGD gypsum. One of the main substrates used in Israel for growth media is volcanic ash (scoria; tuff). The resemblance of bottom coal ash to tuff led us to the assumption that it is possible to substitute tuff with bottom ash. Similarly, bottom ash and FGD gypsum were considered excellent materials for creating growth mixes for agricultural and nursery production uses. In the experiments conducted, bottom ash was studied in Israel and bottom ash, fly ash and FGD gypsum was studied in the US. Major Achievements: In the US, mixes were tested that combine bottom ash, organic amendments (i.e. composts) and FGD gypsum and the best mixes supported growth of tomato, wheat and marigolds that were equal to or better than two commercial mixes used as a positive control. Plants grown on bottom ash in Israel also performed very well and microelements and radionuclides analyses conducted on plants grown on bottom coal ash proved it is safe to ingest the edible organs of these plants. According to these findings, approval to use bottom coal ash for growing vegetables and fruits was issued by the Israeli Ministry of Health. Implications: Bottom coal ash is a suitable substitute for volcanic ash (scoria; tuff) obtained from the Golan Heights as a growth medium in Israel. Recycling of bottom coal ash is more environmentally sustainable than mining a nonrenewable resource. The use of mixes containing CCPs was shown feasible for growing plants in the United States and is now being evaluated at a commercial nursery where red sunset maple trees are being grown in a pot-in-pot production system. In addition, because of the large amount of FGD gypsum that will become available, its use for production of agronomic crops is being expanded due to success of this study.
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Dick, Warren, Yona Chen, and Maurice Watson. Improving nutrient availability in alkaline coal combustion by-products amended with composted animal manures. United States Department of Agriculture, December 2006. http://dx.doi.org/10.32747/2006.7695883.bard.

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Hypothesis and Objectives: We hypothesized that coal combustion products (CCPs), including those created during scrubbing of sulfur dioxide from flue gases, can be used alone or mixed with composted animal manures as effective growth media for plants. Our specific objectives were, therefore, to (1) measure the chemical, physical and hydraulic properties of source materials and prepared mixes, (2) determine the optimum design mix of CCPs and composted animal manures for growth of plants, (3) evaluate the leachate water quality and plant uptake of selected elements from prepared mixes, (4) quantify the interaction between composted animal manures and B concentrations in the mixes, (5) study the availability of P to plants growing in the mixes, and (6) determine the microbial community and siderophores involved in the solubilization of Fe and its transfer to plants. Background: In recent years a major expansion of electricity production by coal combustion has taken place in Israel, the United States and the rest of the world. As a result, a large amount of CCPs are created that include bottom ash, fly ash, flue gas desulfurization (FGD) gypsum and other combustion products. In Israel 100,000 tons of fly ash (10% of total CCPs) are produced each year and in the US a total of 123 million tons of CCPs are produced each year with 71 million tons of fly ash, 18 million tons of bottom ash and 12 million tons of FGD gypsum. Many new scrubbers are being installed and will come on-line in the next 2 to 10 years and this will greatly expand the amount of FGD gypsum. One of the main substrates used in Israel for growth media is volcanic ash (scoria; tuff). The resemblance of bottom coal ash to tuff led us to the assumption that it is possible to substitute tuff with bottom ash. Similarly, bottom ash and FGD gypsum were considered excellent materials for creating growth mixes for agricultural and nursery production uses. In the experiments conducted, bottom ash was studied in Israel and bottom ash, fly ash and FGD gypsum was studied in the US. Major Achievements: In the US, mixes were tested that combine bottom ash, organic amendments (i.e. composts) and FGD gypsum and the best mixes supported growth of tomato, wheat and marigolds that were equal to or better than two commercial mixes used as a positive control. Plants grown on bottom ash in Israel also performed very well and microelements and radionuclides analyses conducted on plants grown on bottom coal ash proved it is safe to ingest the edible organs of these plants. According to these findings, approval to use bottom coal ash for growing vegetables and fruits was issued by the Israeli Ministry of Health. Implications: Bottom coal ash is a suitable substitute for volcanic ash (scoria; tuff) obtained from the Golan Heights as a growth medium in Israel. Recycling of bottom coal ash is more environmentally sustainable than mining a nonrenewable resource. The use of mixes containing CCPs was shown feasible for growing plants in the United States and is now being evaluated at a commercial nursery where red sunset maple trees are being grown in a pot-in-pot production system. In addition, because of the large amount of FGD gypsum that will become available, its use for production of agronomic crops is being expanded due to success of this study.
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8

APPLICATION OF HYDRAULIC SYNCHRONOUS LIFTING TECHNOLOGY IN THE CONSTRUCTION OF LONG-SPAN HYBRID STEEL STRUCTURES. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.070.

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The aim of this study was to solve technical problems, such as uneven structures, multiple lifting points, high accuracy control requirements, and multi-disciplinary collaborative work, in the process of lifting and hoisting long-span hybrid steel structures based on the lifting work of a steel roof and steel beams of the Hunan Radio and Television studio F. First, after conducting research on the comparison and selection of the construction scheme, lifting process, quality control and other aspects, a floor assembly + hydraulic lifting + overhead supplementary bar construction plan was proposed. The large-section steel beam and truss hybrid structure system with different bottom chord elevations was divided into two units for synchronous lifting, with weights of 715 tons and 340 tons, lifting heights of 21.5 metres and 15 metres, and a maximum span of 50.4 metres , Second, the maximum vertical displacement, maximum stress ratio of the members, lifting reaction force frame and overall stability of the hybrid structure during the lifting process were analysed, and the results showed that they all met the requirements. Finally, the monitoring data of the field construction process were in good agreement with the numerical calculation results, further verifying the rationality and feasibility of hydraulic synchronous lifting technology, which can provide guidance and a reference for the construction of similar long-span hybrid steel structures.
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