Dynamic modeling and vibration control for isolation systems based on magnetorheological elastomers

Abstract

A fractional rheological model was developed for MRE-based isolation systems to investigate the influence of material elasticity and viscosity on the isolation effect. The identification of model parameters was realized by fitting experimental data of dynamic mechanical analysis for MRE structures. The superior rationality of modeling was reflected with the good consistency and repeatability. The transmissibility was calculated both theoretically and numerically. The method of numerical simulation was verified with an excellent agreement between theoretical and numerical results. The influence of model parameters on transmissibility and energy flow was analyzed to interpret the dynamic behavior of vibration isolation systems. A control strategy based on the coincidence frequency was developed for this MRE-based isolation system to protect the foundation or the sensitive equipment against periodic vibrations. The isolation effect was investigated from the prospect of transmissibility and energy flow. Eventually, the fuzzy control algorithm was adopted to isolate the sensitive equipment against random motions of the ground, and the effectiveness was further validated by comparing with the passive isolation.