Iterative Learning Control And Its Applied Research In The Electro-hydraulic Servo Complex Control System

Iterative learning control is a branch of intelligent control which has strictly mathematical description. It is suitable to a class of object which has repeat movement characteristics. The research of this technology has a very important significance on the control problem of strong-coupling system. However, electro-hydraulic servo control system is a typical , uncertain and unknown strong coupling system. Such systems have big disturbance ,wide range of work and many time-varying, which is difficult to accurately model. As a result of the impact of factors such as air-gap, electro-hydraulic servo system is very high uncertainty nonlinear strong coupling system.Firstly, the development and research of present situation of iterative learning control are introduced, the basic concepts and fundamental issues of the iterative learning control theory are described in detail; secondly, the composition and the development process of the electro-hydraulic servo system is introduced, the strong-coupling characteristics of the electro-hydraulic servo control system and the causes of the strong-coupling characteristics are analyzed, and the theoretical model of electro-hydraulic servo system is established; Then, iterative learning control is applied to the electro-hydraulic servo control system as a control methods which is put forward response to strong coupling proposed, a variety of control methods are compared, the iterative learning controller is designed, and simulation model of the entire system is established in the Matlab / Simulink, and simulation study is done ; Finally, electro-hydraulic control system is improved, position control and pressure control the of electro-hydraulic servo are combined, a electro-hydraulic servo position and pressure hybrid control strategy is took out to resolve the problem of hybrid control of electro-hydraulic servo system. Then iterative learning controller is designed, and the simulation model of the entire system is established in the Matlab/ Simulink to simulation study. The results showed ,that comparing the application of take iterative learning control directly into a strong coupling electro-hydraulic servo system and the first decoupling to control methods, the control performance has been greatly improved.The above studies have shown that the achieving of control performance of electro-hydraulic servo position and pressure hybrid control system will have a good prospects. Taking iterative learning control into this system will greatly enhance the performance, which not only promotes the theoretical study of electro-hydraulic servo system, but also broadens the field of iterative learning applications, and has a certain value.