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The Application Research of Sliding Mode Variable Structure Control Based on Exponential Approach Law for Electro-Hydraulic Position Servo System

Author: SunYanShi
Tutor: XiongXiaoYan；JinBaoQuan
School: Taiyuan University of Technology
Course: Machinery and electronics
Keywords: electro-hydraulic position servo system sliding mode variable structure control Exponential Approach Law robustness AMEsim/Simulink co-simulation
CLC: TH137
Type: Master's thesis
Year: 2009
Downloads: 88
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Abstract


Electro-hydraulic position servo control system as an important component of the control and high precision, fast response, easy to adjust the characteristics of large inertia control at the same time to achieve high power output, which has been in the field of industrial control a wide range of applications. With the electro-hydraulic servo technology applications development and the gradual promotion of electro-hydraulic servo control systems have become increasingly demanding in a lot of impact on the control precision electro-hydraulic servo system of the factors, the choice of control strategy is critical. The study not too good and complex control algorithm is to improve the electro-hydraulic position servo system to control an important measure for accuracy.As the actual electro-hydraulic position servo system, the existence of outside interference, and hydraulic oil leakage, oil quality, oil and other uncertainties, the electro-hydraulic position servo system is a typical nonlinear system, the complexity of the dynamic characteristics , it is difficult to establish a precise mathematical model of the system, thus using the traditional system based on linear control method of adaptive controller design and poor anti-interference ability, it is difficult to get good control.The actual system requirements for steady-state error small, fast and good robustness, which to the control system design has led to great difficulties. In order to overcome these negative factors, to meet the system requirements, this article will be sliding mode variable structure control strategy applied to the electro-hydraulic servo control system to control the elimination of non-linear properties of the system, and the use of index reaching law to eliminate the jitter, effectively weaken the system chattering phenomenon, and to improve the quality of the convergence phase of the campaign.In this paper valve control oil hydraulic cylinder position servo system for the study, through the theoretical analysis of electro-hydraulic servo system, the establishment of a mathematical model of the hydraulic system to calculate the relevant parameters of the system. The use of Matlab software, the dynamic simulation tool Simulink, structural simulation model of the electro-hydraulic servo system used to describe the functions controller and controlled object.Using the PID and sliding mode variable structure control method of electro-hydraulic position servo control system and compared the results of simulation analysis. AMEsim and Simulink to use the advantages of their more accurate co-simulation technology to simulate the actual system state, and therefore this paper carried out on the system AMEsim and Matlab / Simulink co-simulation analysis.The simulation results show that, regardless of Matlab’s Simulink simulation environment or AMEsim/Simulink co-simulation, changes in system parameters and external disturbance force imposed circumstances, compared with PID control, sliding mode variable structure control has better dynamic characteristics of the object changes the structure and parameters as well as outside interference, and has strong robustness and adaptive capacity, and achieved high precision position servo control.This article also analyzes the parameters of exponential approach law and sliding mode controller parameters on system performance. Simulink simulation and AMEsim/Simulink co-simulation have proved the use of sliding mode variable structure control strategy, the system is good with fast, smooth control, good dynamic performance, robustness and the algorithm is simple and easy to achieve the advantages of computer. Sliding mode variable structure control is therefore in the electro-hydraulic servo system can effectively improve the system of anti-interference ability to improve the control precision, in practice there are a wide range of projects to be valuable.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > Hydraulic transmission
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