| As a new type of intelligent material,magnetorheological elastomer(MRE)has been studied in the isolation device with the characteristics of its adjustable stiffness in recent years.The replacement of traditional rubber materials with MRE has overcome the traditional rubber bearing's limitation of passive and inadjustable,so that the intelligent control of the isolator can be realized so as to adapt to a wider range of seismic environment.As background,the control method of MRE isolation system is studied in this paper.1.Based on the constitutive model of MRE materials,a MRE isolation system is established.On this basis,semi-active control strategies based on sliding mode control(SMC)and deterministic robust control(DRC)are designed to achieve the control goal of reducing the displacement of isolation layer.In addition,the influence of long period earthquake and short period earthquake on isolation system is also discussed.The simulation results show that the two semi-active control strategies designed in this paper have a good control effect on the displacement of the isolation layer.2.This paper designs a fuzzy controller by using the control result of semi-active control strategy based on sliding mode control.Through simulation experiments,the control effect of both in different seismic action is compared,and it is found that the fuzzy controller has a comparable level with semi-active strategy based on sliding mode control.3.As the preliminary preparation of the control scheme designed for experimental verification,a MRE isolator is designed,and its performance test experiment is carried out.The effects of loading voltage,frequency and shear displacement amplitude on the MRE isolator are analyzed.The experimental results show that the equivalent stiffness of the bearing is up to 65% at the voltage of 0 ~ 24 V.4.An experimental system of MRE isolation is built by using the designed MRE isolator,which verifies the effectiveness of the control scheme designed in this paper. |
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