Vehicle vibration test platform structure design and control strategy optimization

Abstract

For the needs of vehicle vibration test platform with high precision, large load capacity and fast response, the three-dimensional model design and analysis of vehicle vibration test platform are carried out; in order to improve the motion performance of the platform, a vibration test plat-form control strategy combining hybrid heuristic algorithm and PID control is proposed. Based on the designed 3D model parameters, the single-channel mathematical model of the servo-electric cylinder is derived and a hybrid heuristic algorithm PID optimization model is established to compare and analyze the control performance of the platform with the Ziegler-Nichols method PID. The results show that the step system overshoot is 3.80% and the dynamic performance of the system is significantly improved when the hybrid heuristic algorithm PID control is used. The simulation system model of vehicle vibration test platform control is established, and the operation results show that the platform is closer to the input signal in the spatial position change curve when the hybrid heuristic algorithm PID control is used. Its maximum displacement error is 0.09 mm, and the motion accuracy of the system is improved by 61% compared with the Ziegler-Nichols method PID control.