Relevant bibliographies by topics / Electro Hydrostatic Actuator (EHA)

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Electro Hydrostatic Actuator (EHA)'

Author: Grafiati
Published: 4 June 2021
Last updated: 5 February 2022

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Journal articles on the topic "Electro Hydrostatic Actuator (EHA)"

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Kotagond, Aravindkumar D., Somashekhar S. Hiremath, and M. A. Kamoji. "Comparison of Controllers and Actuators Effect on Electro Hydrostatic Actuator." Applied Mechanics and Materials 895 (November 2019): 284–89. http://dx.doi.org/10.4028/www.scientific.net/amm.895.284.

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Hydraulic actuators play a major role in aircraft flight actuation and control. Primary control systems in an aircraft typically control the components that guide an airplane during flight. Electro Hydrostatic Actuators (EHA) is emerging as a viable option for aerospace as well as industrial machine builders. It is an emerging technology which replaces centralized hydraulic system by a self-contained and localized direct drive actuator system. As most of the aircraft applications use symmetric actuator, Symmetric actuator EHA system configuration is considered in most of the literatures. However in case of many industrial applications, asymmetric actuators are being used. The dynamic response that means how fast an actuator reaches a target position is an important criteria for any application. An indigenous experimental setup of EHA system is developed with measuring instruments and sensors that forms a mechatronic system. The Variable Motor and Fixed Pump configuration of EHA is used for experimentation. In this work the load analysis is carried out on asymmetric and symmetric actuators. Similarly the load analysis is carried out on different controllers like Proportional Derivative (PD), Proportional Integral (PI) and Proportional Integral Derivative (PID) over the dynamic response as a output. It is found that symmetric actuator and PD controller gives better results.
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Yu, Li Ming, Shou Qiang Wei, Tian Tian Xing, and Hong Liang Liu. "Reliability Analysis of Hybrid Actuation Based on GSPN." Advanced Materials Research 430-432 (January 2012): 1914–17. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.1914.

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Generalized stochastic Petri nets is adopted to develop the reliability models of two operating modes of the hybrid actuation system, which is composed of a SHA (Servo valve controlled Hydraulic Actuator), an EHA (Electro-Hydrostatic Actuator) and an EBHA (Electrical Back-up Hydrostatic Actuator).The dependability of hybrid actuation is got through the Markov chain which the Petri nets sate is isomorphic to and the Monte-Carlo simulation. Simulations are conducted to analyze influences of the operating mode and the fault coverage on system reliability of hybrid actuation system.
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Huang, Ligang, Tian Yu, Zongxia Jiao, and Yanpeng Li. "Active Load-Sensitive Electro-Hydrostatic Actuator for More Electric Aircraft." Applied Sciences 10, no. 19 (2020): 6978. http://dx.doi.org/10.3390/app10196978.

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In the flight control system, using an electro-hydrostatic actuator (EHA) instead of the currently used relatively mature electro-hydraulic valve-controlled actuator, there are three prevailing concerns, namely heating, size, and stiffness. This paper proposes a novel principle EHA, called active load-sensitive EHA (ALS-EHA), which can actively realize the adaptive adjustment of pump displacement with load pressure. Its principle analysis and mathematical modeling based on the direct load-sensitive EHA (DLS-EHA) configuration is done to obtain the relationship between motor current and hydraulic reduction ratio. Then, its stiffness characteristics are analyzed, especially the influence of hydraulic reduction ratio on impedance at low frequencies combined with investigating the power matching of ALS-EHA. A comparative experiment between the developed ALS-EHA and the EHA with fixed pump displacement and variable motor speed (EHA-FPVM) was carried out. The results reveal that the proposed ALS-EHA can reduce the motor heating and its displacement tracking error is smaller near zero speed owing to its higher impedance from the lower hydraulic reduction ratio under heavy load conditions.
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Zhang, Chi, Xu Han, Tatiana Minav, and Yongling Fu. "Multi-Objective Optimization Design of a 30 kW Electro-Hydrostatic Actuator." Proceedings 64, no. 1 (2020): 5. http://dx.doi.org/10.3390/iecat2020-08525.

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Electro-hydrostatic actuators (EHAs) combine the advantages of electric and hydraulic actuation, and it results in a preferable solution for heavy load actuation. The required power level of the EHA is increasing because it is being introduced to large vehicles such as submarines and heavy launch vehicles. Thus, a 30 kW EHA is under development for launch vehicles, which simultaneously require high dynamic performance, light weight, high efficiency, etc. Therefore, a dedicated multi-objective optimization design method is proposed for the preliminary design of the 30 kW EHA. In this study, firstly, the design requirements were analyzed for the launch vehicle application, and the objectives and the constraints of the optimization design were defined for the 30 kW EHA. Secondly, dedicated models were developed for evaluating each objective or constraint, including weight, bandwidth, and efficiency. Thirdly, the multi-objective EHA optimization design was implemented based on the genetic algorithm. Lastly, the optimization design results were evaluated through simulation analysis, which demonstrated that the 30 kW EHA achieved more than 10 Hz bandwidth with under 72 kg weight while the efficiency was also optimized.
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Kou, Fa Rong. "Sky-Hook Control of Vehicle Active Suspension with Electro-Hydrostatic Actuator." Advanced Materials Research 846-847 (November 2013): 30–33. http://dx.doi.org/10.4028/www.scientific.net/amr.846-847.30.

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A kind of vehicle active suspension based on Electro-Hydrostatic Actuator (EHA) is put forward. The suspension system consists of two parts: spring and actuator with controlled force. The actuator includes hydraulic cylinder, hydraulic pump, controller, etc. In this paper, a quarter-car dynamic model is exactly established involving bond graph models of EHA parts. Under the input conditions of the given road profile and designed sky-hook controller, The prototype and test rig of EHA active suspension are developed and bench tests are carried out. The simulation and experimental results show that sky-hook active suspension with EHA provides better ride comfort, handling and stability than passive suspension.
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Tanaka, Hirokazu, Hiroshi Kaminaga, and Yoshihiko Nakamura. "Pressure Feedback Control Based on Singular Perturbation Method of an Electro-Hydrostatic Actuator for an Exoskeletal Power-Assist System." Journal of Robotics and Mechatronics 24, no. 2 (2012): 354–62. http://dx.doi.org/10.20965/jrm.2012.p0354.

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This paper describes control methods of an Electro-Hydrostatic Actuators (EHA) for an exoskeletal power-assist systems. By increasing backdrivability of the electro-hydrostatic actuators, the exoskeletal power-assist systems can achieve haptic interaction with a human. We propose a pressure feedback controller based on singular perturbation method, which is used in a power-assist controller of the exoskeletal power-assist system. The controller assists human movements by increasing the sensitivity of the electrohydrostatic actuator with estimated torque feedback. The controllers were implemented on an exoskeletal power-assist system for a knee joint with an electrohydrostatic actuator. Their efficacy was evaluated by experiments.
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Park, Y. H., and S. H. Park. "Identification and Control of Position Control System for Electro-Hydraulic Actuator (EHA)." Journal of the Korea Society For Power System Engineering 15, no. 2 (2011): 69–77. http://dx.doi.org/10.9726/kspse.2011.15.2.069.

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Kou, Fa Rong. "The Control Study of Vehicle Active Suspension with Electro-Hydrostatic Actuator." Applied Mechanics and Materials 97-98 (September 2011): 716–20. http://dx.doi.org/10.4028/www.scientific.net/amm.97-98.716.

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Actuator is the key to vehicle active suspension. Based on the analyses of traditional passive suspension and active suspension system, a novel vehicle active suspension with Electro-Hydrostatic Actuator (EHA) is put forward. The system consists of two parts: spring and actuator with variable control force. The actuator is made up of hydraulic cylinder, hydraulic pump, controller and BLDCM. According to bond graph principles, bond graph model of 2 DOF passive suspensions and bond graph model of EHA active suspension are built. Moreover, fuzzy logic controller is designed and fuzzy control active suspension is simulated using MATLAB tools. The prototype and test rig of EHA active suspension are developed and bench tests are carried out. The simulation and experimental results show that fuzzy control active suspension with EHA provides better ride comfort, handling and stability than passive suspension.
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Jawaid, Syed Imran, and Liang Wang. "EHA System Integration Design Analysis and Position Tracking Performance by PID Controller." Applied Mechanics and Materials 419 (October 2013): 826–34. http://dx.doi.org/10.4028/www.scientific.net/amm.419.826.

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Electro-hydraulic actuation is now an emerging and well established technology and currently applicable in almost all fields but most important application of electro-hydrostatic actuator (EHA) is aerospace industry. This paper will discuss the selection and designing of major sub-assemblies and their integration to form an EHA unit. A complete, compact, and high performance EHA will be designed in different sections of paper and dynamic analysis of major assemblies is carried out to meet the designed requirements. In last section position tracking performance of the EHA is analysed by using a conventional PID Controller and simulation results are discussed.
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Kou, Fa Rong, Jian Ma, and Ji Bai Wang. "The Simulation and Experimental Study on a Novel Vehicle Active Suspension with Electro-Hydrostatic Actuator." Advanced Materials Research 430-432 (January 2012): 1984–87. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.1984.

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Actuator is a very important part of vehicle active control suspension. Based on the analyses of traditional passive suspension and active suspension system, a novel vehicle active suspension with Electro-Hydrostatic Actuator (EHA) is put forward. The system consists of two parts: spring and actuator with variable control force. The actuator includes hydraulic cylinder, hydraulic pump, controller, etc. According to bond graph principle, bond graph model of EHA active suspension are built. In addition, sky-hook controller and fuzzy logic controller are designed and sky-hook control and fuzzy control active suspension are simulated using MATLAB tools. The prototype and test rig of EHA active suspension are developed and bench tests are carried out. The simulation and experimental results show that sky-hook control and fuzzy control active suspension with EHA provide better ride comfort and stability than passive suspension system.
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Dissertations / Theses on the topic "Electro Hydrostatic Actuator (EHA)"

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Seung, Taehun. "Holistic-Lightweight Approach for actuation systems of the next generation aircraft." Universitätsverlag Chemnitz, 2017. https://monarch.qucosa.de/id/qucosa%3A34400.

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Currently the system development of aircraft engineering concentrates its focus on the reduction of energy consumption more than ever before. As a consequence, the efficiency of subsystems inside the aircraft is highlighted. According to previous investigations the simplification/unification of conventional multifaceted board energy systems by means of electric power management is the most promising way concerning aircraft global efficiency improvement. The main aim of the present work was to optimize a multi-device, heavy duty EHA-System by introducing of a comprehensive perspective. In order to achieve the final, non-plus-ultra improvement level, the attributes of architecture, hardware and operation method were combined in an interactive manner, whereas particular attention has been paid to the mutual enhancing influences. The maximum reduction of losses, the minimizing of consumption and weight optimization can be achieved concurrently when the physical coherences between the involved subsystems are understood and their hidden potentials are exploited. This can only be achieved in one way and the detail follows: The most effective way to reduce both manufacturing effort and weight is to introduce a multiple-allocation philosophy. The highest reliability possible can be achieved by novel cascade-nested system architecture and strict restraining of the control logic. By employing an ultra-low-loss hardware concept, the energy efficiency can be maximized at a necessary minimum own weight. Last but not least, possibly the most important cognition is that an intelligent operation method will improve the actual system and influence the entire system positively and with a lower effort. The final conclusion is that the only and reasonable way to achieve an ultimate optimized solution of an actuation system is an all-encompassing consideration. Eventually it was to recognize that the final result is nothing but ultimate lightweight architecture, i.e. a non-plus-ultra solution.<br>Gegenwärtig konzentriert sich die Technologieentwicklung für Flugzeuge auf die Reduktion des Energieverbrauchs mehr denn je zuvor. Hierfür ist die Effizienz der an Bord befindlichen, nicht propulsiven Subsysteme neben der Wirkungsgradverbesserung der Triebwerke von zentraler Bedeutung. Laut vorangegangenen Untersuchungen und Studien ist die Vereinfachung bzw. Vereinheitlichung der Vielfalt der konventionellen Bordenergiesysteme durch ein adäquates Energiemanagement unter Verwendung von Elektrizität der aussichtsreichte Weg zur Effizienzverbesserung auf der Gesamtflugzeugebene. Durch die Elektrifizierung wurden die einzelnen Geräte zwar zuverlässiger und energieeffizienter als je zuvor aber gleichzeitig erheblich schwerer, sodaß ein signifikanter Verlust an Nutzlasten auf Gesamtflugzeugebene hervorgerufen wird. Das Hauptziel der vorliegenden Arbeit war es, ein Schwerlast-EHA-System mit mehrfachen Betätigungseinheiten durch Einführung von umfassenden Perspektiven zu optimieren. Durch Einführung der sog. ganzheitlichen Leichtbauweise demonstriert die Arbeit, wie das Subsystem mit mehreren Endgeräten ultimativ optimiert werden kann, ohne Abstriche an Gewichtsbilanz u/o Kompromiß mit der Energieeffizienz zu machen. Um eine wahrhaftige Optimierung, d.h. die Erreichung des ultimativen, Nonplusultra-Verbesserungslevels zu erreichen, wurden die Systemarchitektur, die Hardware und die Operationsmethode interaktiv kombiniert, wobei die besondere Aufmerksamkeit auf die interaktiven, zur Verbesserung führenden Einflüsse gelegt wurde. Die Minimierung des Energieverbrauchs und die ultimative Gewichtsoptimierung gleichzeitig können erreicht werden, wenn die physikalischen Zusammenhänge zwischen den involvierten Subsystemen verstanden und ihre verborgenen Potentiale ausgenutzt werden. Der einzige und vernünftige Weg zur Erreichung der ultimativen Optimierung eines Betätigungssystems ist eine allumfassende Betrachtung, also eine ganzheitliche Betrachtungs- bzw. Vorgehensweise.
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Röben, Tobias, Emmanuel Viennet, and Henry Wider. "Robustness of the Liebherr-Aerospace EHA Technology for future flight control application." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71210.

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Future more electric aircraft (MEA) architectures require a new generation of power-by-wire actuators, e.g. Electro Hydrostatic Actuators (EHA). These units have to be capable of frontline operation of safety critical flight control surfaces over the entire aircraft life. Prove of robustness becomes a challenging objective. This paper illustrates the Liebherr-Aerospace EHA technology as well as methods for validation of robustness. It gives an insight regarding the design of a robust piston pump.
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Júnior, Francival Barbosa. "Analysis of electro-hydrostatic actuator in more electric aircraft." Instituto Tecnológico de Aeronáutica, 2006. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=900.

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The aim of this dissertation is to evaluate the possibility of using electrically powered systems instead of a centralized hydraulic system composed of set of distribution pipes for aircrafts' primary control surfaces actuation. Focus will be given in the following topics: Description of new actuation technologies; Option chosen to be studied among the new possibilities; Comparison between the traditional system and the new proposal e System engineering evaluation regarding: weight, safety, thermal issue, connection with electric system, maintenance and certification. Besides that, a more electric actuation architecture will be proposed and compared with the conventional option for an airplane design's case study. A simulation model will be developed to describe the more electric actuator behavior and preview its interaction with other systems. This model will be included in a closed loop to command a primary surface. The closed-loop project will be developed based on an algorithmic method. A Genetic Algorithm (GA) will be implemented to define the gains. Finally, the results obtained will be discussed.
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Duarte, da Silva João Pedro, Amadeu Plácido Neto, Negri Victor Juliano De, and Alexandre Orth. "Experimental evaluation of an electro-Hydrostatic actuator for subsea applications in a hyperbaric chamber." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71079.

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A novel Electro-Hydrostatic Actuator (EHA) prototype – designed to operate on subsea gate valves in deep and ultra-deep water – is analysed and qualified in terms of functionality under design and normative constraints. The prototype is assembled in a test bench for load control in a hyperbaric chamber where the high subsea environmental pressure can be emulated. The process variables under evaluation are monitored through a set of pressure and position sensors, which are part of the prototype design. The experimental results demonstrate a robust behaviour of the actuator concerning the imposed external pressure and load forces even with a forced limitation in its power input. Moreover, the prototype performs consistently throughout the entire endurance trial, asserting high reliability. With the results obtained, the subsea EHA concept is effectually eligible to a technology readiness level 4, according to the API 17N.
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Larson, John P. "Design of a Magnetostrictive-Hydraulic Actuator Considering Nonlinear System Dynamics and Fluid-Structure Coupling." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1402566309.

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Vaezi, Tahere, Mohamed Smaoui, Paolo Massioni, Xavier Brun, and Eric Bideaux. "Nonlinear force tracking control of electrohydrostatic actuators submitted to motion disturbances." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71092.

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In some industrial fields, such as aerospace, electro-hydrostatic actuators (EHAs) are increasingly used to replace conventional standard hydraulic actuators due to their better energy performance. Moreover, implementing different type or technology of actuators in redundant actuation systems working on the same moving part introduced some new challenges. This paper presents a force-tracking controller for an asymmetric electro-hydrostatic actuator that is submitted to an external motion generated by an external source. In this case, the rod displacement is considered as an external disturbance for the hydraulic cylinder, but it is assumed that this disturbance can be easily measured using sensors. The theoretical motivation of this work is discussed along and a variable gain state feedback control based on Linear Parameter Varying control (LPV) theory is proposed to achieve stability, disturbance rejection and tracking performance. The Linear Matrix Inequalities (LMI) framework is used to determine a control law including an augmented state feedback with an integral action that reduces trajectory-tracking errors. Simulation results of the control law are finally given to verify the global performance of this control design.
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Books on the topic "Electro Hydrostatic Actuator (EHA)"

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Navarro, Robert. Performance of an electro-hydrostatic actuator on the F-18 systems research aircraft. National Aeronautics and Space Administration, Dryden Flight Research Center, 1997.

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Navarro, Robert. Performance on an electro-hydrostatic actuator on the F-18 systems research aircraft. National Aeronautics and Space Administration, Dryden Flight Research Center, 1997.

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Navarro, Robert. Performance of an electro-hydrostatic actuator on the F-18 systems research aircraft. National Aeronautics and Space Administration, Dryden Flight Research Center, 1997.

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Book chapters on the topic "Electro Hydrostatic Actuator (EHA)"

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Kim, Hyun-ho, Ill-yeong Lee, and Jun-young Huh. "High-Bandwidth Tracking Control of Electric Hydrostatic Actuator (EHA) Using an Input Shaping Filter." In AETA 2016: Recent Advances in Electrical Engineering and Related Sciences. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-50904-4_10.

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Kotagond, Aravindkumar D., Somashekhar S. Hiremath, and M. A. Kamoji. "Reliability of Different Loads on Electro Hydrostatic Actuator." In ICRRM 2019 – System Reliability, Quality Control, Safety, Maintenance and Management. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-8507-0_11.

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Song, Jixin, Liming Yu, Xudong Han, and Jian Fu. "Modeling and Simulation of Redundancy Management of Electro-Hydrostatic Actuator." In Lecture Notes in Electrical Engineering. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8458-9_58.

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Yan, Xudong, Liming Yu, Junlin Pan, Jian Fu, and Yongling Fu. "Control Dynamic Performance Analysis of a Novel Integrated Electro Mechanical Hydrostatic Actuator." In Lecture Notes in Electrical Engineering. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-3305-7_206.

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Kaminaga, Hiroshi, Tianyi Ko, Ryo Masumura, et al. "Mechanism and Control of Whole-Body Electro-Hydrostatic Actuator Driven Humanoid Robot Hydra." In Springer Proceedings in Advanced Robotics. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50115-4_57.

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Tessari, Federico, Renato Galluzzi, Nicola Amati, Andrea Tonoli, Matteo Laffranchi, and Lorenzo De Michieli. "Design and Testing of a Fully-Integrated Electro-Hydrostatic Actuator for Powered Knee Prostheses." In Biosystems & Biorobotics. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69547-7_16.

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Yan, Xudong, Liming Yu, Jiang’ao Zhao, Jian Fu, and Yongling Fu. "Hierarchical Modelling and Simulation of a Novel Integrated Electro-Mechanical Hydrostatic Actuator Based on Bond Graph." In Proceedings of 2018 Chinese Intelligent Systems Conference. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2291-4_59.

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Conference papers on the topic "Electro Hydrostatic Actuator (EHA)"

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Lee, Woong Yong, Min Jun Kim, and Wan Kyun Chung. "An approach to development of electro hydrostatic actuator (EHA)-based robot joints." In 2015 IEEE International Conference on Industrial Technology (ICIT). IEEE, 2015. http://dx.doi.org/10.1109/icit.2015.7125083.

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Zhou, Fengqi, Wenjian Xiao, Xiaoping Ouyang, Pengfei Zhang, Lilin Xu, and Huayong Yang. "Modeling and Control of a Novel Electro-Hydrostatic Actuator With a Three-Ports Hydraulic Pump." In BATH/ASME 2020 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/fpmc2020-2736.

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Abstract The electro-hydrostatic actuator (EHA) is a kind of power-by-wire (PBW) actuator that converts the electrical power into localized hydraulic power for flight control. In order to solve the problem of flow mismatching in the asymmetric cylinder, this paper presents a novel EHA which applies a three-ports fixed displacement pump to work with the asymmetric cylinder. The working principle of the novel EHA is introduced, and its nonlinear mathematical model is built. The sliding-mode control is proposed to control the position loop of the EHA. The controller structure of EHA is built including the position control using sliding-mode control, the speed control using PI, and the current control using PI. The model of mechanical parts including the permanent magnet synchronous motor (PMSM), controller and hydraulic parts are built in the SIMULINK. Simulation results show that the sliding-mode control improves the dynamic response and control accuracy compared with the traditional classic PID.
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El Sayed, Mohammed A., and Saeid Habibi. "Inner-Loop Control for Electro-Hydraulic (EHA) Actuation Systems." In ASME 2009 Dynamic Systems and Control Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/dscc2009-2586.

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This article presents the development of a multiple inner-loop control strategy for improving the performance of hydrostatic actuation systems. In these actuators, the presence of non-linearities associated with pump/motor static friction and backlash, pressure drop in the piping system, and nonlinear friction at the load have a significant effect on the performance and positional accuracy of the system. The effect of nonlinear friction at the pump/motor interface has been overcome by the use of a high gain pump-speed inner-loop control strategy. In this article, the concept of inner-loop control will be extended to target specific sources of performance degradation. Velocity feedback will be incorporated in this manner to decrease the effects of pump backlash and nonlinear friction at the load. Simulation results supported by theoretical analysis indicate that a considerable improvement in performance can be achieved by the implementation of this control strategy.
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Li, Wei, Richard Burton, and Saeid Habibi. "Investigation of a High Precision Hydrostatic Actuation System: How Nonlinearities Affect Its Performance." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41650.

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A prototype Electro-Hydraulic Actuator (EHA) system has demonstrated a positional accuracy in the order of 100 nanometer. Linearized models of the EHA have been formulated and have shown reasonable correlation to the performance of the physical EHA. However, these models predict zero steady state error (an impossible situation given the physical limitations of seals, friction etc.). Further, the prototype EHA indicates that the cut-off frequency decreases as the amplitude of the input signal decreases. This is not predicted by the linear models. In this paper the Bond-graph large scale modeling technique was used as the basis to formulate the describing equations of the EHA. The model was made increasingly more complex by introducing observable nonlinearities into the model. It was found that the introduction of nonlinear friction did show results whose trends were consistent with those observed experimentally. Assumed nonlinearities in the bulk modulus could not be substantiated. In addition, some of the observed experimental trends could not be predicted (such as order change) and pose additional challenges to be solved before a complete understanding of the true physics of the EHA can be realized.
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Afshari, Hamed Hossein, Stephan Andrew Gadsden, and Saeid Habibi. "Condition Monitoring of an Electro-Hydrostatic Actuator Using the Dynamic 2nd-Order Smooth Variable Structure Filter." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-47436.

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This paper introduces the dynamic 2nd-order Smooth Variable Structure Filter (Dynamic 2nd-order SVSF) method for the purpose of robust state estimation. Thereafter, it presents an application of this method for condition monitoring of an electro-hydrostatic actuator system. The SVSF-type filtering is in general designed based on the sliding mode theory; whereas the sliding mode variable is equal to the innovation (measurement error). In order to formulate the dynamic 2nd-order SVSF, a dynamic sliding mode manifold is defined such that it preserves the first and second order sliding conditions. This causes that the measurement error and its first difference are pushed toward zero until reaching the existence subspace. Hence, this filter benefits from the robustness and chattering suppression properties of the second order sliding mode systems. These help the filter to suppress the undesirable chattering effects without the need for approximation or interpolation that however reduces accuracy and robustness of the SVSF-type filtering. In order to investigate the performance of the dynamic 2nd-order SVSF for state estimation, it applies to an Electro-Hydrostatic Actuator (EHA) system under the normal and uncertain scenarios. Simulation results are then compared with ones obtained by other estimation methods such as the Kalman filter and the 1st-order SVSF method.
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Tovo, Rafael Luiz da Silva, Francisco Javier Triveño Vargas, and Luiz Carlos Sandoval Góes. "Virtual Environment With AMESim and its Integration With MATLAB-Simulink." In 9th FPNI Ph.D. Symposium on Fluid Power. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fpni2016-1527.

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Increasingly, the product development industry coexists with highly complex and integrated systems, parallel to the search for engineering tools that are not difficult to use, reduce the complexity and effort to successfully model the systems and, at the same time, provide reliable results. In this context, to demonstrate the differences between the signal-port and the multi-port modeling approaches, and to analyze the modeling effort demanded by each, this work aims at building, in MATLAB/Simulink® and LMS Imagine.Lab AMESim, a model of flight control’s electro-hydrostatic actuator (EHA). Further, this same EHA system is built in a model that integrates both environments. Simulations then provided data for performance comparisons and conclusions about the possible gains of this integration, for industrial research &amp; development purpose. Lastly, the physical nonlinear EHA AMESim model is linearized, rendering a transfer function model, available to be used in linear control studies in MATLAB-Simulink.
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Achten, Peter, Robin Mommers, Jeroen Potma, and Jasper Achten. "Experimental Investigation of a Hydrostatic Bearing Between Barrels and Port Plates in Floating Cup Axial Piston Pumps." In BATH/ASME 2020 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/fpmc2020-2712.

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Abstract Hydrostatic machines often have multiple hydrodynamic bearing interfaces, which also serve as a sealing interface. In axial piston machines, the bearing and sealing interface between the barrel and the port plate is a well known example. At reasonably high operating speeds, hydrodynamic effects create an oil film between the barrel and the port plate. This oil film will then, to a certain extend, lift the barrel from the port plate, thereby avoiding metal-to-metal contact. The disadvantage of hydrodynamic bearings is, that they need a relatively high velocity of the sliding components, in order to reduce the friction. Below a certain speed, mixed lubrication and finally solid friction will occur. This results in strongly increased friction losses and wear. Low speed operation has always been of interest for hydrostatic motors, which are often operated at close to zero speed or at low rotational speeds. But low and near zero speed operation has also become of importance for pumps when being operated in electro-hydraulic actuators (EHAs). Many of the existing pump principles are not allowed to be operated below a certain minimum speed, due to excessive wear which results from coulomb friction conditions. Furthermore, the stick-slip-behaviour creates additional nonlinear behaviour of the EHA-operation, and makes it difficult to control EHAs. In order to overcome the disadvantages of hydrodynamic bearings, a new hydrostatic bearing has been developed [1]. In the new bearing, the sealing land of the barrel is divided into three concentric rings. In the middle ring, so called pockets are created. Each pocket has a direct connection with the corresponding port by means of a small groove. The new bearing not only lifts the barrel to a certain height, but also helps to counteract the tilting torque of the barrel. The size of the pocket grooves determines the height of the oil film, and therefore also the leakage and viscous friction of the bearing and sealing interface. In a recent research project, INNAS has performed a number of experiments to measure the influence of the groove size on the overall efficiency, as well as on the leakage and torque loss. Measurements have been performed on a 24 cc floating cup pump in a speed range between 500 and 4000 rpm and a pressure range between 100 and 400 bar. At the end of the project, the range has been extended to a speed range between 0.23 and 4400 rpm, and a pressure range between 50 and 450 bar. This paper describes some of the results of these experiments. The measured width of the pocket grooves is taken as a characteristic parameter for the size of the flow area and resistance of the pocket grooves.
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Yin, Lisheng, and Keli Xing. "Test research of electro-hydrostatic actuator." In ADVANCES IN MATERIALS, MACHINERY, ELECTRONICS III: 3rd International Conference on Advances in Materials, Machinery, Electronics (AMME 2019). Author(s), 2019. http://dx.doi.org/10.1063/1.5090670.

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9

Whitley, C. R. "A matrix converter based electro-hydrostatic actuator." In IEE Seminar Matrix Converters. IEE, 2003. http://dx.doi.org/10.1049/ic:20030053.

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10

Kang, Rongjie, Zongxia Jiao, Shuai Wu, Yaoxing Shang, and Jean-Charles Mare. "The Nonlinear Accuracy Model of Electro-Hydrostatic Actuator." In 2008 IEEE Conference on Robotics, Automation and Mechatronics (RAM). IEEE, 2008. http://dx.doi.org/10.1109/ramech.2008.4681367.

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