Design And Research Of Negative Stiffness Magnetorheological Elastomer Vibration Isolator

Magnetorheological elastor isolator with negative changing stiffness overcomes the disadvantage of traditional magnetorheological elastor isolator that needs to be energized to maintain stability even no vibration occurs.Therefore,the Magnetorheological elastor isolator with negative changing stiffness has certain engineering research value.Aiming at the disadvantage of traditional magnetorheological elastor isolator,a magnetorheological elastor isolator with negative changing stiffness is designed and studied in this paper.The specific research contents is in the following aspects:(1)The magnetorheological elastomer was prepared,and the material properties of magnetorheological elastomer were tested.The influence of frequency,strain and temperature on the modules and magnetorheological effects of magnetorheological elastomer were investigated.A magnetorheological elastor isolator with negative changing stiffness was designed.The design process was detailed describe from the four aspects of working mode selection,structural design,material selection and magnetic field simulation.(2)In order to test the dynamic mechanical characteristics of magnetorheological elastomer isolator under different excitation(different amplitude and frequency)and different current,a dynamic mechanical performance test platform for magnetorheological elastomer isolator is established and relevant tests are performed.The effects of frequency,amplitude and current on the stiffness and damping of the magnetorheological elastomer isolator are analyzed.(3)A neural network model was established to approximate the dynamic behaviors of the magnetorheological elastomer isolator,and it was trained using the data measured in the dynamic mechanical performance experiment.The validity and feasibility of the model is verified by comparing the experimental and predicted responses of the isolator.In order to test the frequency shift characteristic of magnetorheological elastomer isolator,a test platform for the frequency shift characteristic of the magnetorheological elastomer isolator is set up and relevant tests are performed.(4)Aiming at the common harmonic excitation,the Bang-Bang control strategy is expounded,and the effectiveness of Bang-Bang control strategy is verified through experiments.For the common random excitations,the on-off control strategy and fuzzy control strategy are described,and the effectiveness of on-off control strategy and fuzzy control strategy is verified by simulation.