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�������պ����ѧѧ�� 2009, Vol. 35 Issue (3) :338-341    DOI:
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Block diagram modeling and control of electro-hydrostatic actuator
Kang Rongjie, Jiao Zongxia, Wang Shaoping*
School of Automation Science and Electrical Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� Power-by-wire (PBW) actuation is the future direction of flight control system in which the need for a central hydraulic system is eliminated. The electro-hydrostatic actuator (EHA) is a kind of PBW actuator that converts the electrical power into local hydraulic power and combines the benefits of the conventional hydraulic system and the direct drive electrical actuators. Based on the mathematic equations, all the EHA components were modeled by the block diagrams and assembled to a fixed-displacement variable-speed architecture, which contained the refeeding circuit and the friction. Furthermore, the single proportion integration differentiation (PID) controller, cascade PID controller and state feedback controller are designed for comparison analysis that focused on the system stability, stiffness and dynamic characteristics. The simulation results prove that the state feedback controller along with dynamic pressure feedback strategy efficiently improves the static and dynamic performance of EHA.
Keywords�� electro-hydrostatic actuator   block diagram model   simulation   control     
Received 2008-05-14;
About author: ���ٽ�(1981-),��,����������,��ʿ��,kangrongjie@vip.163.com.
���ٽ�, ������, ����Ƽ.�綯��Һ��������ͼ��ģ�����[J]  �������պ����ѧѧ��, 2009,V35(3): 338-341
Kang Rongjie, Jiao Zongxia, Wang Shaoping.Block diagram modeling and control of electro-hydrostatic actuator[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2009,V35(3): 338-341
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