Refined Modeling and Characteristic Analysis of Electro-hydrostatic Actuator

doi:10.3901/JME.2021.24.066

Abstract

Abstract: Electro-hydrostatic actuator(EHA), the actuator of electric drive and hydraulic transmission, is competitive in that it is small in size, light in weight, high in power density. In addition, it is equipped with good controllability and maintainability as well as high integration and reliability. Traditional EHA linear modeling methods usually ignore the strong nonlinearities of motor and pump. This modeling method is too conservative, which reduces the accuracy of the model and affects the accuracy of high performance control and performance prediction. In order to deal with the conservative problem of the traditional modeling method, a refined model considering the nonlinearities of servo motor and pump is established. To improve the EHA simulation model, the permanent magnet synchronous motor(PMSM), a time-varying, nonlinear, strongly coupled and multivariate system, is established by MATLAB/SIMULINK; and a quantitative piston pump model with flow pulsation and leakage is established by AMESim. Further, the system parameters of PMSM and pump are changed to perform an electro-hydraulic co-simulation based on MATLAB-AMESim. Comparisons are made under multiple simulation conditions, which reveal the typical characteristics of the EHA system and the influences of system parameters on tracking performance of the controller. The refined model is established for characteristic analysis, which provides theoretical support and simulation verification means for the impact analysis of EHA system parameters on control performance.

Key words: electro-hydrostatic actuator, refined modeling, electro-hydraulic co-simulation, characteristic analysis

CLC Number:

TG156

GE Yaowen, ZHU Weilin, LIU Jiahui, DENG Wenxiang, YAO Jianyong. Refined Modeling and Characteristic Analysis of Electro-hydrostatic Actuator[J]. Journal of Mechanical Engineering, 2021, 57(24): 66-73.

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