Design And Optimization Of The Electro-hydraulic Servo-valve

The electro-hydraulic servo-valve is the key element in electro-hydraulic servo-control system and used in modern automatic control system broadly. The performance characteristics of electro-hydraulic servo-valve directly affect the performance of the whole hydraulic servo-control system. It is necessary to optimize the parameters of the servo-valve for improving the dynamic servo-control system performance. Since a general way of servo-valve's dynamic parameters design is some configurable parameters adjusted with experiences, it leads to the process of servo-valve's design wasting too much time. In fact, the dynamic performance of servo-valve is connected with lots of parameters. The process of servo-valve's design would be shorten by using optimization theory and experience.In order to improve the dynamic performance of the force-feedback electro-hydraulic servo-valve, the practical scheme was discussed to reach the optimization of valve parameters on the basis of static state design in this paper. First, the type of electro-hydraulic servo-valve, and the principium and characteristic of the force-feedback electro-hydraulic servo-valve were introduced. Secondly, a non-linear analytical model of two-stage electro-hydraulic force-feedback servo-valve was built. Thirdly, static parameters of the two-stage electro-hydraulic servo-valve were calculated, and the software of calculating static parameters with MATLAB GUI (Graphics User Interface) automatically was designed. Finally, 8 important dynamic parameters of the force-feedback electro-hydraulic servo-valve were optimized, and the optimized parameters were proved to improve the servo-valve's dynamic performance with MATLAB SIMULINK.It was proved by MATLAB SIMULINK that the optimized ways is effective through the comparison of the optimized parameters of QDY electro-hydraulic servo-valve with those before.