To address the surplus force problem of electrohydraulic 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 actuator’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 simulation model are built based on PID control. Theoretical analysis and simulation results prove the feasibility of the method.
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安惠,郝晓欣,汪成文,权龙.对流量补偿电液负载模拟器的研究[J].机床与液压,2015,43(6):16-21. . Study on electro-hydraulic load simulator based on flow compensation method[J]. Machine Tool & Hydraulics,2015,43(6):16-21