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INVESTIGATION ON FAULT DETECTION & DIAGNOSIS FOR POSITION SERVO SYSTEM OF AIRCRAFT ACTUATOR
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作者 Zhang Jianhua Li Yunhua +1 位作者 Wang Zhanlin Qiu Lihua(Faculty 303, Beijing University of Aeronautics and Astronautics, Beijing, China, 100083) 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 1997年第1期68-74,共7页
A new approach to fault dignosis dealing with nonlinear system Hopfieldneural networks (HNN) is presented. The model parameters of the nonlinear systemtreated as functions of measured operating points and faults are e... A new approach to fault dignosis dealing with nonlinear system Hopfieldneural networks (HNN) is presented. The model parameters of the nonlinear systemtreated as functions of measured operating points and faults are estimated by HNN. Boththe nominal model of the healthy system and HNN training models corresponding to everyoperating point are recognized. In addition, the anticipated fault models corresponding toevery kind of fault and every operating point are obtaind in advance. The real systemmodel parameters of the system estimated by generalization process of HNN are matchedwith the nominal models of the healthy system and anticipated fault models. Consequent-ly, the final result of fault detection and diagnosis is acquired. The approach to fault diag-nosis is used in an aircraft actuating poisition servo system and the simulation resu1t is re-ported. 展开更多
关键词 FAULTS detection DIAGNOSIS nonlinear systems Hopfield neural networks(HNN) aircraft's actuating position servo systems
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Modeling and fuzzy adaptive proportion-integration-differentiation control of X-Y position servo system actuated by oscillating pneumatic cylinder
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作者 袁德虎 Zhang Ziqun Meng Guoxiang 《High Technology Letters》 EI CAS 2010年第4期337-344,共8页
The servo system actuated by oscillating pneumatic cylinder for X-Y plate is a multi-variable nonlinear control system. Its mathematical model is established, and nonlinear factors are analyzed. Due to the existence o... The servo system actuated by oscillating pneumatic cylinder for X-Y plate is a multi-variable nonlinear control system. Its mathematical model is established, and nonlinear factors are analyzed. Due to the existence of deadlock zone and the small damp of the pneumatic oscillating cylinder, it is likely to result in overshoot, and there is also certain steady-state error, so online modifying of proportion-integration-differentiation (PID) parameters is needed so as to achieve better control performance. Meanwhile considering the stability demand for long-term run, a fuzzy adaptive PID controller is designed. The result of hardware-inloop (HIL) test and real-time control experiment shows that the adaptive PID controller has desirable serfadaptability and robustness to external disturbance and to change of system parameters, and its control per- fonnance is better than that of traditional PID controllers. 展开更多
关键词 fuzzy adaptive control servo system actuated by oscillating cylinder hardware-in-loop (HIL) trajectory tracking
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Output feedback control and parameters influence analysis of active suspension electro-hydraulic servo actuator
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作者 张伟 ZHAO Dingxuan GONG Mingde 《High Technology Letters》 EI CAS 2023年第2期159-165,共7页
The hydraulic servo actuator of heavy vehicle active suspension is investigated to clarify the correlation between system parameters and the control characteristics of active suspension hydraulic servo system.Accordin... The hydraulic servo actuator of heavy vehicle active suspension is investigated to clarify the correlation between system parameters and the control characteristics of active suspension hydraulic servo system.Accordingly, a nonlinear physical model of electro-hydraulic servo active suspension system is built.Compared with the conventional nonlinear modeling, the model in this study considers the asymmetry of working areas caused by single rod hydraulic cylinder in the suspension system.In accordance with the model, a nonlinear output feedback controller based on backstepping is designed, and the effectiveness of the controller is proved based on the experimental platform.The dynamic response curve of the electro-hydraulic servo control system under the change of parameters is generated based on the simulation model.The sensitivity of electro-hydraulic servo control performance to the change of system physical parameters is investigated, and two evaluation indexes are proposed to quantify and compare the effect of all physical parameter changes on position control system.As revealed by the results, the position control characteristics of suspension actuator are more sensitive to the changes of flow gain of the servo valve, system supply oil pressure and effective working areas of cylinder, and the two evaluation indexes are over 10 times higher than other physical parameters. 展开更多
关键词 active suspension NONLINEAR hydraulic servo actuator output feedback
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Adaptive high precision position control of servo actuator with friction compensation using LuGre model 被引量:1
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作者 邵志宇 方东洋 张晓东 《Journal of Beijing Institute of Technology》 EI CAS 2011年第1期105-110,共6页
Adaptive control of servo actuator with nonlinear friction compensation is addressed. LuGre dynamic friction model is adopted to characterize the nonlinear friction and a new kind of slid ing mode observer is designe... Adaptive control of servo actuator with nonlinear friction compensation is addressed. LuGre dynamic friction model is adopted to characterize the nonlinear friction and a new kind of slid ing mode observer is designed to estimate the internal immeasurable state of LuGre model. Based on the estimated friction state, adaptive laws are designed to identify the unknown model parameters and the external disturbances, and the system stability and asymptotic trajectory tracking perform ance are guaranteed by Lyapunov function. The position tracking performance is verified by the ex perimental results. 展开更多
关键词 adaptive control position tracking servo actuator LuGre friction model sliding modeobserver
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Study on Friction Torque Loading with an Electro-hydraulic Load Simulator 被引量:14
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作者 Shang Yaoxing Jiao Zongxia Wang Xiaodong Zhao Sijun 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2009年第6期691-699,共9页
This article, in order to precisely impose friction on aircraft and weapon actuation systems, presents a new friction loading method characteristic of "torque-zero velocity" switching control with an electro-hydraul... This article, in order to precisely impose friction on aircraft and weapon actuation systems, presents a new friction loading method characteristic of "torque-zero velocity" switching control with an electro-hydraulic load simulator. As the general Stribeck friction model has little related to static friction, it proposes a "torque-zero velocity" switcher, in which a zero-velocity controller is developed to load the static friction and a torque controller the kinetic friction. With the help of mathematical modeling, this article designs a "torque-zero velocity" switching controller and, correspondingly, provides a "dual-threshold judgment" algorithm. Simulation results indicate that the proposed method can be successfully used to carry out the static and kinetic friction simulation with an electro-hydraulic load simulator. 展开更多
关键词 FRICTION electro-hydraulic load simulator friction torque loading torque-zero velocity switching control servo mechanism actuator
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