Results 41 to 50 of about 250,590 (188)

Variable displacement electro-hydrostatic actuator [PDF]

Proceedings of the IEEE 1991 National Aerospace and Electronics Conference NAECON 1991, 2002
The author discusses the effects of pump displacement on electro-hydrostatic actuator (EHA) performance characteristics and the possible advantages of using a variable displacement pump in an EHA. Issues discussed are heating, size, and stiffness.
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Design and Numerical Study of Electro-Hydrostatic Actuator [PDF]

Journal of Physics: Conference Series, 2019
Abstract In order to improve the compactness and integration of electro-hydrostatic equipment to meet their miniaturization, a new electro-hydrostatic actuator (EHA) scheme is proposed, and the working principle and feature are introduced.
Yousheng Yang, Wenqian Niu, Jing Zhao
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Results of a Feasibility Study of a Prognostic System for Electro-Hydraulic Flight Control Actuators

International Journal of Prognostics and Health Management, 2021
Electro-Hydraulic Servo-Actuators (EHSA) are currently the most used actuation technology for primary flight control systems of civil and military aircrafts. Although some alternatives have emerged in the last decade, such as electromechanical or electro-
Sylvain Autin, Andrea De Martin Giovanni Jacazio, Jérôme Socheleau, George Vachtsevanos   +3 more
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Design and Testing of a Fully-Integrated Electro-Hydrostatic Actuator for Powered Knee Prostheses

, 2021
Electro-hydrostatic actuation represents a well-suited alternative in prosthetic and robotic applications to electro-mechanical actuation. In this regard, its favorable controllability and intrinsic back-drivability are key enabling features.
Tonoli, Andrea, Federico Tessari, De Michieli, Lorenzo, Matteo Laffranchi, Andrea Tonoli, Lorenzo De Michieli, Tessari, Federico, Laffranchi, Matteo, Nicola Amati, Galluzzi, Renato, Renato Galluzzi, Amati, Nicola   +11 more
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A novel architecture of electro-hydrostatic actuator with digital distribution

Chinese Journal of Aeronautics, 2021
Abstract To address the flow imbalance rapidly of the asymmetric Electro-Hydrostatic Actuator (EHA), this paper presents a novel architecture of asymmetric EHA with the Digital Distribution (EHA-DD). It also improves the flow nonlinearity and control accuracy of the pump, especially in the low-speed condition.
Jing YAO, Pei WANG, Zhaosheng DONG, Dongting JIANG, Tong SHA   +4 more
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Study on characteristics of a novel water-hydraulic pump with electro-hydrostatic actuator

Meitan xuebao
In order to resolve the issues of wear, limited lifespan, and excessive noise commonly associated with traditional swashplate axial piston pumps in aqueous environments,while meeting the reliability requirements for hydraulic pumps in demanding ...
Lin SHEN, Zhangwen QIU, Tong XING
doaj   +1 more source

Fault Mode Analysis and Convex Optimization-Based Fault-Tolerant Control for New Type Dissimilar Redundant Actuation System of Near Space Vehicle

Applied Sciences, 2023
A new type dissimilar redundant actuation system (NT-DRAS), which is composed of an electro-hydrostatic actuator (EHA) and an electro-mechanical actuator (EMA), is applied in high value unmanned aerial vehicles such as the future near space vehicles to ...
Jian Huang, Jun Wang, Weikang Li, Di Liu, Cun Shi, Fan Zhang   +5 more
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Research on the Control Method of Force Servo System of Liquid Hydrostatic Guide Oil Film Thickness Test Bench for Machine Tools

Shock and Vibration, 2022
The test bench was designed to solve the problem of measuring the oil film thickness of the liquid hydrostatic guideway of machine tools. And based on the fast overshoot of the classical PID control, introducing the self-antidisturbance control algorithm,
Xu Fang, Youmin Wang, Bo Zhu
doaj   +1 more source

Highly Compact Swing Assistive Knee Prosthesis Integrating Active and Passive Hydraulic Systems

IEEE Access
This work proposes a novel partially powered knee prosthesis to give full support to swing related activities. It represents a technological step forward when compared to microprocessor-controlled knees.
Marco Puliti, Federico Tessari, Renato Galluzzi, Nicola Amati, Andrea Tonoli, Matteo Laffranchi   +5 more
doaj   +1 more source

Performance Analysis of an Electro-Hydrostatic Actuator

Journal of the Korean Society for Aeronautical & Space Sciences, 2007
The EHA(Electro-hydrostatic Actuator) reveals completely different characteristics from the conventional valve-controlled Electro-hydraulic actuators. In this paper, its mathematical model including nonlinear elements was derived to be verified by experiments.
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