Research On Design And Control Of Laminated Magnetorheological Elastomer Vibration Isolator

Vibration control technology has been used in the field of building vibration isolation for more than 40 years.It is one of the effective means to resist strong natural disasters such as earthquake.Semi active control technology is a potential vibration control method,which has the advantages of simple structure,good control effect and less energy consumption.Magnetorheological elastomer(MRE)is a kind of magnetorheological intelligent material with many advantages.It has excellent magnetic control characteristics and obvious variable stiffness characteristics.It has a great application prospect in the field of semi-active vibration control.In this paper,according to the magnetic control characteristics of magnetorheological elastomer with variable stiffness,the preparation and performance test of magnetorheological elastomer,the optimal design of laminated magnetorheological elastomer vibration isolator,and the semi-active control system based on magnetorheological elastomer(MRE)vibration isolator are studied by simulation and experiment.The main contents of this paper are as follows:(1)The MRE isolator was optimized.The existing MRE isolators in the laboratory are optimized.The main optimization objectives are the vertical bearing capacity and magnetic circuit.From the MRE material to the magnetic circuit design and calculation of the vibration isolator,the simulation analysis of the magnetic field environment is carried out at last;from the theoretical calculation to the model simulation,the results of the two are consistent and meet the design conditions.(2)According to the test data,the mechanical characteristics of the isolator are analyzed.Bouc Wen model and high-order polynomial model are selected to model the isolator.Then the genetic algorithm is used to fit the parameters.The results show that the two models can well describe the mechanical properties of MRE isolator and reflect the variation law of vibration isolator.However,from the perspective of error,the prediction accuracy of high-order polynomial model is higher than that of Bouc-Wen model.(3)A variable stiffness semi-active vibration isolation control system based on MRE isolator is designed and simulated.Firstly,the fuzzy controller is optimized,and the membership function parameters of the fuzzy controller are optimized with the global search ability of genetic algorithm,and the optimized fuzzy controller is obtained.Then,taking a four-storey building as an example,under the action of EI Centro wave,Taft wave and artificial seismic wave with the peak acceleration of 0.4g,the simulation analysis is carried out on the non-isolated structure,on-off control,fuzzy control and genetic fuzzy control respectively.The control strategies are analyzed and compared from the displacement response and acceleration response.(4)The vibration isolation control test platform based on MRE isolator is built.Based on d SPACE platform,the experimental control model is built and the vibration isolation control experiment is completed.