Affiliations: State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an, Shaanxi, China
Correspondence:
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Corresponding author: Xinong Zhang, State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China. Tel.: +86 29 82668482; E-mail:xnzhang@mail.xjtu.edu.cn
Abstract: To improve the performance of vibration isolator in the
low frequency region, a magnetic spring-beam vibration isolator with the
high-static-low-dynamic stiffness (HSLDS) characteristic is developed in
this paper. The proposed isolator is designed by combining a negative
stiffness magnetic spring (NSMS) in parallel with an Euler-Bernoulli beam.
The NSMS comprising four magnet pairs is utilized to reduce the resonant
frequency of the isolator. An analytical expression of the negative
stiffness (NS) of the NSMS is derived according to the Amperian current
model, and the approximation to NS is deduced. Based on the harmonic balance
method (HBM), the dynamic response of the isolator is obtained and the
impacts of external force and damping ratio on the force transmissibility
are investigated numerically. The simulated results demonstrate that the
NSMS can effectively reduce the resonant frequency of the isolator and
broaden the bandwidth for vibration isolation. Also the damping property of
the isolator with NSMS is improved.
Keywords: Vibration isolation, negative stiffness magnetic spring, Euler-Bernoulli beam
