Modeling And Simulation Of Direct-driving Electro-hydraulic Servo Actuator Control System

As the actuator of aircraft control system, direct-driving electro-hydraulic servo actuator is an important device for controlling flight attitude, which performance has a decisive impact on flight characteristics of the aircraft. In this paper, the stable, dynamic and static performance of a small direct driving electro-hydraulic servo actuator have been analysed by modeling and simulation, and its controller has been improved.First, the working principle and structure characteristics of direct-driving electro-hydraulic servo actuator have been analysed. Base on the kinematics theory, the mathematical model of servo actuator system has been built, and a transfer function of actuator system was obtained. The servo system was analyzed in frequency domain by using Matlab software, its stability has been analysed through the Bode diagram.Based on the software platform of AMESim and the structure of the direct-driving electro-hydraulic servo actuator control system, the mode of the actuator control system has been built, and the simulation analysis has been completed. We can find the deficiencies of the system by the analysis, and find out the reasons of it, then to revise and improve it.According to the performance requirements of steering system, the design and improvement of the controller have been developed. By combining neural network was with traditional PID controller, the single neuron adaptive PID controller was used for the control of the actuator. The results of the simulation show that the system of the direct-driving electro-hydraulic servo actuator which has applied the single neuron adaptive PID controller has rapid response, high precision control and no overshoot. The stability of the system is better.