Semi-active Control Of Structural Vibration With Magnetorheological Elastomer Isolator

Magnetorheological elastomer has overcome the shortcomings of magnetorheological fluid such as easy to precipitate and instability. And magnetorheological elastomer has more advantages,such as free from seal,more simple structure,good mechanical properties, rapid response and has broad prospects in the field of vibration control. The semi-active control is becoming a hot spot in the research of vibration control in recent years. The control effect of semi-active control is close to the active control, but it only needs minimal external energy and has more stable performance.In this paper, the application of the magnetorheological elastomer isolator in semi-active vibration isolation is studied. Due to the dynamic characteristics of magnetorheological elastomers isolator is very complex,with characteristics of nonlinear, hysteretic and so on. At present, the study of mechanics model to describe its mechanical properties and the research of its control algorithm that can be fully played are in the initial stage. Based on the experimental data of mechanical properties of a magnetorheological elastomer isolator, the parameters of Bouc-Wen model are identified by genetic algorithm, compared with the experimental results, the accuracy of Bouc-Wen model is verified. Put forward the improved Bingham model, and use the model to describe the magnetorheological elastomer isolator..In order to apply the magnetorheological elastomer isolator to engineering practice more conveniently, this paper according to the experimental data to calculate the equivalent linear damping and the equivalent stiffness of the magnetorheological elastomer isolator.Then according to the principle of vibration isolation, based on the variable stiffness mechanism of the magnetorheological elastomer isolator, illustrate the working principle of magnetorheological elastomers isolator. And carry on the simulation analysis to the magnetorheological elastomer isolator of single-stage and two-stage isolation system in Matlab/Simulink, verify the validity of the magnetorheological elastomer isolator.Finally, this paper studies the control strategy of the magnetorheological elastomer isolator, design the on-off control and fuzzy control strategies.The simulation results show that magnetorheological elastomer isolator has good performance of vibration isolation under the switch control, effectively reduces the vibration level. On the basis of the on-off control, design fuzzy controller, the simulation results show that the vibration isolation performance under the fuzzy control is superior to on-off control.