电液复合调节作动器的建模与AMESim仿真

针对传统功率电传一体化作动器存在的诸如动态响应差、固有频率低等问题,提出一种增加了一个总压力控制阀的改进型电液复合调节一体化作动器.通过保持作动筒高、低压腔的压力之和为一常数,使泵控系统的固有频率和阀控系统相同,有效地改善了动态响应.在综合考虑这种改进的电液一体化作动器中不可忽视的结构刚度、摩擦、泄漏等非线性因素对系统的影响后,在已有简化模型基础上建立了非线性仿真模型.用AMESim软件进行仿真验证和分析,结果表明该模型较好地反映了实际系统的性能,为功率电传一体化舵机的进一步结构优化和控制提供了理论依据.

Modeling and AMESim Simulation of Electrohydraulic Compound Regulating Integrated Actuator

Based on the problems, such as bad dynamic response and low natural frequency of the traditional power-by-wire (PBW) integrated actuation, this paper put forward an improved electrohydraulic compound regulating integrated actuator (EHCA) to which a total pressure control valve is added to enhance the natural frequency by keeping the sum of pressures in the high pressures cavity and the low pressure cavity of the cylinder constant and to improve the dynamic response. Considering the effects of such nonlinear factors such as structural stiffness, friction and pipeline leakage which can not be ignored in EHCA, the nonlinear model of EHCA is built. Based on AMESim simulation validation, the nonlinear model is proved to be a preferable one which can fairly reflect the performance of the practical system. This provides the theoretical foundation to the further structure optimization and control of the PBW integrated actuator.