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Advances in Materials Science and Engineering
Volume 2015 (2015), Article ID 837657, 8 pages
http://dx.doi.org/10.1155/2015/837657
Research Article

Performance of Variable Negative Stiffness MRE Vibration Isolation System

1Department of Engineering Mechanics, Hohai University, Nanjing 210098, China
2Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, China
3School of Architectural and Civil Engineering, Ningbo University of Technology, Ningbo 315016, China

Received 4 July 2015; Revised 14 September 2015; Accepted 29 September 2015

Academic Editor: Kaveh Edalati

Copyright © 2015 Run-pu Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Magnetorheological elastomer (MRE) vibration isolation devices can improve a system’s vibration response via adjustable stiffness and damping under different magnetic fields. Combined with negative stiffness design, these MRE devices can reduce a system’s stiffness and improve the vibration control effect significantly. This paper develops a variable negative stiffness MRE isolation device by combining an improved separable iron core with laminated MREs. The relationship between the negative stiffness and the performance of the device is obtained by mathematical transformation. Its vibration response under simple harmonic excitation at small amplitude and the impact of the volume fraction of soft magnetic particles on the isolation system are also analyzed. The results show that the negative stiffness produced by the magnetic force is a major factor affecting the capacity of the isolation system. Compared to devices of the same size, the isolation system equipped with low-particle volume fraction MREs demonstrates better performance.