A new type of electromagnetic system for magnetorheological elastomer (MRE)-based base isolation system

摘要

Magnetorheological elastomer (MRE)-based base isolation system has been proposed to compensate for the drawbacksof the existing passive-type base isolation system. MRE is one of smart material with magnetorheological (MR) effectthat can change the stiffness and damping ratio in real time when the magnetic field is applied. The conventional MREbasedbase isolation system has inter-place between MRE and electromagnetic system. This is determined inconsideration of the deformation of MRE, resulting in loss of magnetic flux density and excessive volume of MRE-basedbase isolation system. Since the strain of the MRE should be considered to be 100 % as base isolation system, the size ofthe base isolation system becomes large and the practical applicability is remarkably reduced. In addition, the loss of themagnetic flux density increases according to the size of the inter-space between MRE and electromagnetic system.Therefore, a new type of electromagnetic system is proposed to address these problems. In this study, an electromagneticsystem which can move with MRE by separating it to the laminated type is proposed. MRE-based base isolation systemwith the laminated electromagnetic system occupies a small volume compared to the conventional MRE-based baseisolation system and can form magnetic closed loop which can minimize the loss of the magnetic flux density. Thenumerical simulation was performed to compare the proposed electromagnetic system and the conventional MRE-basedbase isolation. From the numerical simulation, the lab-scale experiment was carried out and the proposed method can beutilized to improve the reality of MRE-based base isolation system.