对流量补偿电液负载模拟器的研究(英文)

Study on electro-hydraulic load simulator based on flow compensation method

针对多余力影响电液负载模拟器加载精度的问题,增加了流量补偿回路。由于运动的承载系统强迫负载模拟器跟随其运动产生多余力,而多余力是影响电液负载模拟器跟踪精度的主要因素。利用流量补偿速度回路、伺服阀力回路分别控制负载模拟器速度和输出力,从结构上实现力与速度的解耦,消除被测系统主运动对电液负载模拟器加载精度的影响。利用阀口压差对速度回路中的伺服阀流量进行修正,以消除压降对流量的影响从而提高流量补偿回路动态性能。基于PID控制建立系统数学模型并搭建物理仿真模型,通过理论分析和仿真结果分析证明该方案具有可行性。

To address the surplus force problem of electro-hydraulic load simulator （ EHLS）, a method adding a flow compensation circuit is developed in this paper. As the major factor affecting the tracking performance of EHLS, surplus force is mainly caused by loaded system＇ s active motion. Through adding the flow compensation velocity circuit, force and velocity are respectively controlled and well decoupled. Thus the influence of the actua- tor＇ s velocity on the loading force can be well eliminated. Utilizing the pressure difference at valve＇ s ports, the flow trough servo valve is modified. The flow of modified servo valve does not correspond to its pressure drop yet, which finally improve the dynamic performance of flow compensation circuit. System mathematical model and sim- ulation model are built based on PID control. Theoretical analysis and simulation results prove the feasibility of the method.