Simulation Study On MIMO Random Vibration Test Based On Matlab/Simulink

Virtual vibration experiment aiming at improving the efficiency of product development, reducing costs, optimizing the product design is of important significance in engineering practice. The research on virtual vibration experiment mainly concentrated in the finite element method and the single electric shaking table vibration testing simulation.There is no research result on virtual vibration experiment about single shaft vibration table and multi-axis vibration table. And most of the virtual test is the sine excitation vibration test. Therefore, based on the study of the mechanical structure and electromagnetic properties of the electric shaking table, the construction scheme of multi input multi output virtual vibration environment test is designed in this paper.Major research works in this paper are shown as following.Parameters of electric shaking table are obtained by testing the acceleration frequency response curve.Then according to these parameters Matlab/Simulink and Vitrual.lab software platform are used to build the electric shaking table simulation model.The random input signal generation method and the matrix power algorithm are used to establish the MIMO random vibration control system. The validity of the control system is verified by carring out the MIMO random vibration control simulation test with beam model.The missile modal test is carried out to amend the finite element model.Then the rigid flexible coupling modeling of double electromagnetic shaking model and the finite element model is built.A co-simulation of double electromagnetic shaking model, the rigid flexible coupling model and the MIMO random vibration control system is carried out.The simulation results show that the vibration control simulation system has satisfactory vibration control effect, and the acceleration response of each monitoring point is observed.The multi input and multi output random vibration control test of the missile model is carried out on the two shaking table. The comparison results show that the co-simulation test has the ability to reflect the true response of the missile model.