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Shock and Vibration
Volume 2017, Article ID 4132607, 15 pages
https://doi.org/10.1155/2017/4132607
Research Article

Magnetic Nonlinear Energy Sink for Vibration Attenuation of Unbalanced Rotor System

School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China

Correspondence should be addressed to Hongliang Yao; nc.ude.uen.liam@oaylh

Received 17 July 2017; Revised 18 October 2017; Accepted 5 November 2017; Published 14 December 2017

Academic Editor: Mickaël Lallart

Copyright © 2017 Hongliang Yao 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

A novel nonlinear energy sink (NES) consisting of permanent magnetic springs and coil springs is proposed, and the vibration attenuation performance of the NES for unbalanced rotor system is investigated. Firstly, the nonlinearity of the magnet spring is analyzed and the structure of the NES is introduced. Then, the dynamic model of the rotor system with the NES is built, and the responses and stabilities of the system are studied by applying Complexification-averaging method. The strongly modulated responses (SMR) behavior, which is the most important performance characteristic of the NES, is analytically studied by combining Complexification-averaging method and multiscale method and numerically verified by Runge-Kutta method. The results show that the NES is effective in attenuating the vibration of unbalanced rotor, and the SMR occurrence range can be broadened by increasing the nonlinearity of the NES. And also, the NES has better performance over a wider frequency range than the linear absorber.