Research On A Vertical Synchronous Control System For Hydraulic Support Test-bed

With the development of hydraulic technique in the field of industry,the problem of synchronization among different hydrauilic actuators becomes more and more important. Electro-Hydraulic synchronization control has the advantage of simple structure and high control precision,which is adapt to automation control and the case needed big power. But because of the difference among each hydraulic system's leaks and the loadings of the actuators,a synchronization error accrues in the synchronizing movement of several actuators. This paper is focus on the research of valve-controlled asymmetry cylinder hydraulic synchronization system. Use computer control technique to increase control precision,as well as reducing synchronization error.Consulted numerous related literatures and reference materials at home and abroad,Electro-hydraulic proportional control system for a 4-cylinder synchronous system applies proportional servo-valve to control asymmetrical hydraulic cylinder actuator is proposed. The paper establishes the mathematical model to asymmetrical actuator on the base of considering proportional serve-valve characteristic,then analyses the modeling to proportional servo-valve,and finally sets up valve-control system model for asymmetrical hydraulic cylinder position. After all models are founded, the 4-cylinder synchronous system motion mechanism is simulated and studied experimentally based on control algorithms of PID, Fuzzy and Fuzzy-PID respectively and general control structures of 'consistent-value type' and 'master-slaver type'respectively.The simulations are finished by applying the software of Matlab/Simulink. Program for control system and the control algorithms is written by the author using computer language of VC++. To solve the problem of low synchronous precision caused by the disturbance from position changes,a self-adaptive fuzzy PID control is proposed. By using the Fuzzy-Control toolbox in Matlab,a self-adaptive fuzzy PID control model is established. With the function of automatic code generation in Real-Time Workspace,C code is generated and embedded into the VC++ control program automatically.