Research On The Control Method Of Resonant Electrohydraulic Shaking Table

Electrohydraulic shaking table is an important equipment in vibration experiment.Because of the complex nonlinear characteristics of the electrohydraulic shaking system,the output response of the system tends to have large amplitude and phase lag error,which affects the effect of the shaking experiment.In order to improve the control effect of electrohydraulic shaking system,a series of researches are carried out on the control method of the shaking system.According to the characteristics of the shaking system,the relevant control algorithm is studied and the corresponding controller is designed,and the satisfactory control effect is achieved in the experiment.This paper summarizes the classification characteristics of shaking table and the development of shaking control research at home and abroad.According to the demand of shaking index,based on the electrohydraulic shaking table,a variable stiffness resonance mechanism is connected in the hydraulic cylinder,and the resonant electrohydraulic shaking table is formed.The structure and working principle of the whole resonant electrohydraulic shaking system are deduced in detail.According to the established mathematical model,the corresponding shaking system simulation model was established in Matlab/Simulink,and the main research content is as follows:1.According to the highly complex and nonlinear characteristics of the controlled model,the robust and adaptable PID control is selected.Firstly,the parameter setting is based on experimental method and ziegler-nichols method.The feedforward compensation controller is added to the existing lag problem,and the control effect is improved.2.In order to solve the problem of real system time denaturation,the fuzzy adaptive PID controller,which is more suitable for practical experiment,is designed by combining the traditional PID method and the fuzzy algorithm.Apply it to the simulation model of shaking system established,and the feasibility of the fuzzy adaptive PID controller were verified by simulation experiment.3.In this paper,the shaking table is built,the designed controller is applied to theshaking experiment platform,and the experiment is designed with the step response experiment and the sinusoidal signal response experiment of 4 different frequencies.The experimental results of PID,feedforward PID and fuzzy self-adaptive PID are compared and analyzed under different working conditions,and the characteristics of different control methods under different working conditions are described in detail.It proves that the control method of the study has effectively improved the control effects of the electrohydraulic servo shaking table.