Research On Multi Flexibility Electro Hydraulic Servo System And Its Neural Network Control Strategy

In this paper,the influence of the coupling characteristics of various flexible links of electro-hydraulic position servo system on the stability,rapidity and control precision of the system is analyzed.The electro-hydraulic position servo system is analyzed to establish a mathematical model.Theoretically,the influence of mutual coupling of multi-flexibility links on the dynamic characteristics of the system is studied.Because the multiple flexible links in the system seriously affect the control precision and response speed of the electro-hydraulic position servo system.Therefore,this paper studies the control strategy of the effects of multiple flexible links on the low speed and low precision of the system.The controller is designed for multiple flexible-circuit electro-hydraulic position servo systems to improve the influence of nonlinear and uncertain factors caused by multiple flexible links on system performance.The specific research contents are as follows:(1)Two force balance equations are obtained by analyzing the piston and load of the electro-hydraulic position servo system.and the mathematical model of the electro-hydraulic position servo system is established.Aiming at the influence of the coupling of multi-flexibility links on the dynamic characteristics of the system,the effects of the three coupling relationships on the stability,accuracy and rapidity of the system are theoretically analyzed,and different control conclusions are obtained.(2)Aiming at the influence of coupling characteristics of multi-flexibility link on system stability and response characteristics,the time-domain and frequency-domain characteristics of electro-hydraulic position servo system are analyzed,and the influence of different pole-zero points on system stability is studied.The stability of the system in the case of closed-loop and semi-closedloop diagrams is simulated and analyzed.Then the control precision and dynamic response characteristics of the system are simulated and analyzed.For the low-precision and low-speed conditions,the feedforward correction controller and the BP neural network PID controller are designed.By designing the controller structure and adjusting the PID parameters,the control effect is improved and the control performance of the system is improved.(3)For the problem of dynamic quality and low control precision of multi-flexibility link electro-hydraulic position servo system,the feedforward correction control and PID control based on BP neural network are used for simulation analysis,and then the simulation analysis results are experimentally studied.The simulation and experimental results show that the two controller designs have better control effects on the multi-flexibility link electro-hydraulic position servo system.but the system has better dynamic quality and control performance based on BP neural network PID control,which improves the control precision and response speed of the system.Experiments verify the effectiveness and reliability of the control strategy.