Research On Control Of Valve Control Single-Rod Electro-Hydraulic Servo-System

According to the character of valve control single-rod electro-hydraulic servo-system, the pole-set adaptive control with covariance reset theory was applied in the system's R&D in this thesis.Actually, the nonlinear factor such as the flux-pressure character in servo mechanism, the parameter's time variable, noisy of output and the disturbance of load, all of these should be taken into accounted. At the same time, the system has asymmetry performance in two directions because of using single-rod. Uncertain caused by these factors made the system's control is very difficult. So it has the strong background to adapt the pole-set adaptive control with covariance reset theory in application of valve control single-rod electro-hydraulic servo-system.In this thesis, the nonlinear model of hydraulic servo-system was established firstly, then the pole-set adaptive control theory was proposed and the detail program was given, at the same time, the pole-set adaptive control with covariance reset theory was developed to resolve the asymmetry performance in two directions. After this, the closed system's stability, bounding and robust was discussed. Based on this, the possible problem in actually system was pointed out. In order to test the theory's validity and the value of its application in project, run it in Matlab software and established the system's model in analog element according to system's transfer function, then the theory was tested in real-time control system. On the other hand, as a taste for nonlinear design, the backstepping method was used in valve control single-rod electro-hydraulic servo-system and the possible of its application was discussed in this thesis.Simulation shows that the pole-set adaptive control with covariance reset...