Design And Research Of Two Degree Of Freedom Electro-hydraulic Shaker

As a commonly used test device for vibration environment simulation test,electrohydraulic shaker is mainly used to assess the reliability and durability of the test piece in the vibration environment.At present,the shaking table widely used at home and abroad is mainly a single-degree-of-freedom structure,which is difficult to accurately evaluate the performance of the test piece in a multi-degree-of-freedom environment.This project comes from the special fund project of Jiangsu Province for the transformation of scientific and technological achievements "R&D and industrialization of high-thrust high-performance vibration test system",designs and develops a set of two-degree-of-freedom electro-hydraulic shaker device,constructs the electro-hydraulic shaker acceleration feedforward inverse model control strategy and adaptive control strategy,and provides theoretical support for improving the acceleration tracking accuracy of the shaker.Firstly,the overall scheme of the hardware system of the two-degree-of-freedom electro-hydraulic shaker is designed,the detailed design of the mechanical system,hydraulic system and control system of the two-degree-of-freedom electro-hydraulic shaker and the selection and calculation of key components are completed,and the finite element analysis of the key mechanical structures such as the reaction seat and platform of the two-degree-of-freedom electro-hydraulic shaker is carried out.Secondly,the correlation between the motion of the two-degree-of-freedom electro-hydraulic shaker platform and the displacement of the servo actuator is analyzed,and the power actuator model of the electro-hydraulic shaker is established,and based on the classic three-state control strategy and the independent control strategy of the degree of freedom,the simulation model of the electro-hydraulic shaker is constructed by MATLAB/Simulink software,and the tracking characteristics of the two-degree-offreedom electro-hydraulic vibration platform and the coupling influence law between the degrees of freedom are analyzed.Thirdly,by using system identification and zero-amplitude tracking technology,a two-degree-of-freedom electro-hydraulic shaker feedforward inverse model under three-state control is designed,and on this basis,the electro-hydraulic shaker adaptive control strategy is further constructed,and the simulation comparison research of threestate control,feed-forward inverse model control and adaptive control strategy is carried out based on MATLAB/Simulink software.Finally,a two-degree-of-freedom electro-hydraulic shaker experimental prototype was built,the underlying control program of the experimental bench was developed by x PC/Target rapid prototyping technology,the sensor signal acquisition and posture movement functional verification were carried out,and the acceleration tracking performance comparison experiment of three-state control,feed-forward inverse model control and adaptive control strategy was further carried out,which verified the effectiveness and superiority of the design control strategy.