Research on servo control algorithm based on third — order sliding mode control

摘要

The servo control system is very important for the tracking and flight safety of the aircraft, and the control algorithm determines the performance of the servo control system. In order to improve the performance of the control system, this paper proposes a three closed-loop sliding mode variable structure control method. In this method, the third-order sliding mode variable structure algorithm is proposed by using the current, rotational speed and position feedback of the system as input. This method overcomes the problem of step response integral overshoot and poor response to system parameters perturbation and load disturbance of the traditional PID control. Simulation and experimental results show that the step response overshoot of the system based on the three closed-loop sliding mode control is obviously reduced, the static error under the constant disturbance is eliminated, and the settling time is obviously shortened. This indicates that the control algorithm has strong robustness and can significantly improve the dynamic characteristics and steady-state accuracy of the system.