Decoupling Control Study Of Passive Electric Hydraulic Servo System

Passive electric hydraulic servo system is one kind of typical electro-hydraulicload simulator.On the ground it can simulate load which aircraft, ships, missiles, etccarry in the actual environment,and test the performance of the controlled object.Passive electric hydraulic servo system mainly consists of the load system and positionsystem.During work,load system not only applies position system load but also moveswith the position system.As a result,when the position system is in active motion,itwill produce forced flow in two-cavity of loaded cylinder,which will cause the changeof load pressure, then produced surplus force.Surplus force has serious effects on loadperformance of load system and control accuracy.So how to suppress the surplus forceand enhance frequency response of the system will be a key issue in the passiveelectric hydraulic servo system.Based on lots of correlative literatures at home and abroad, this paper gives anoverview on the modern status of the passive electric hydraulic servo system at homeand abroad,and analyses their characteristics. On this basis,using the feed-forwardcompensation decoupling control method dissolves the coupling relationship of loadsystem and position system in the passive electric hydraulic servo system, thereforerepresses the surplus force.Through using the theoretical modeling,establish transfer function model of loadsystem and the position system in passive electric hydraulic servo system according tohydraulic principle diagrams, then simplify the model according to the fact,andanalyze the coupling relationship of the two systems.By the feed-forward compensate-on decoupling control principle, calculate the transfer function of feed-forward com-pensateon controller.Use the AMESim software to simulate and analyze control perf-ormance of the passive electric hydraulic servo system.To further enhance the controlperformance of the system, on the basis of feed-forward compensation decouplingcontrol,come up with joining the PID controller in the frontal channel of the system and analyze the simulationFinally,build the passive electric hydraulic servo system test,and design the har-dware and software of the control system.By the experiment,study decoupling controlmethod proposed in this paper and the experiment results verify the accuracy of thetheoretical analysis.