Permanent Magnets Based Nonlinear Vibration Isolator Subjected to Large Amplitude Acceleration Excitations

doi:10.3901/JME.2019.11.169

Abstract

Abstract: Large amplitude excitations extremely affect the performance of host structures, such as the vibrations during the launch. A novel permanent magnets based nonlinear isolator is proposed, which utilizes the nonlinear force to construct an equivalent negative stiffness and also utilizes the softening spring to realize the high performance isolation. The nonlinear vibration isolator mainly comprises of an axial permanent magnet (PM) and three radial PMs that are uniformly distributed along the circumference, where all the PMs are magnetized along their axes. The governing equation of the isolator is established, and the displacement transmissibility is obtained with the harmonic balance method. The isolation performance tests under the base acceleration with the amplitude of 0.2g, 0.3g, 5g and 7g are carried out. The results demonstrate that the peak frequency and corresponding transmissibility decrease by 47% and 70% with the nonlinear isolator. For the asymmetric configuration of the radial PMs, the peak frequency and corresponding transmissibility decrease by 51% and 86%.

Key words: harmonic balance method, negative stiffness, nonlinear isolation, nonlinear oscillation, vibration control

CLC Number:

O328
TH113

YAN Bo, MA Hongye, HAN Ruixiang, WANG Ke, WU Chuanyu. Permanent Magnets Based Nonlinear Vibration Isolator Subjected to Large Amplitude Acceleration Excitations[J]. Journal of Mechanical Engineering, 2019, 55(11): 169-175.

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