泵阀协调控制电动静液作动器方案分析

针对典型的EHA (Electro-Hydrostatic Actuator)系统存在的频响较低的问题,为了兼顾作动系统的效率和频响,将控制阀引入了EHA系统,提出了3种泵阀协调控制的EHA方案,分别是:采用EHSV(Electro-Hydraulic Servo Valve)的EHA系统,采用DDV(Direct Drive Valve)的EHA系统以及采用TPCV(Total Pressure Control Valve)的EHA系统.阐述了这3种方案的系统组成及工作原理,采用AMESim对这3种方案及典型的EHA进行了仿真对比分析.从仿真结果可以看出:泵阀协调控制的EHA系统可以大大提高系统的频响,同时还具有较高的效率.作为3种过渡方案,将对目前机载电动静液作动系统的研制具有实际指导意义.

Scheme analysis of pump-valve coordinated control electro-hydrostatic actuator

Aiming at the problem of low response which existed in the typical electro-hydrostatic actuator(EHA) systems,control valve was introduced into EHA systems to find a trade-off between efficiency and response.Three schemes of pump-valve coordinated control EHA were put forward.First was EHA with electro-hydraulic servo valve,second was EHA with direct drive valve,and third was EHA with total pressure control valve.The system composition and operating principle of the three schemes were analyzed.Also each scheme was simulated and compared in AMESim.The simulation results show that pump-valve coordinated control EHA will greatly improve the system response and its efficiency is also higher.As three transitional schemes,they have practical guidance significance to the research and development of present airborne electro-hydrostatic actuation system.