Nonlinear dynamics and vibration reduction properties of a quasi-zero stiffness magnetic isolator under translational and rotational coupling excitation
Jingxuan Wang, Guo Yao, Yuzhu Tao
Abstract
To suppress both vertical and rotational vibrations, a quasi-zero stiffness (QZS) vibration isolator is proposed. The device uses the magnet pair’s hardening stiffness to compensate for the X-shaped structure’s negative stiffness. The comparative validation is completed by comparing the simulation results of ADAMS and COMSOL. The device’s dynamic characteristics are systematically analyzed. The numerical analysis results show that a) under coupling exactions, the proposed isolator may perform rich nonlinear dynamic responses such as hardening nonlinearity, jump phenomena, loop phenomena and the super-harmonic resonance; b) in terms of the force transmissibility, the nonlinear effect produced by horizontal damping have more desirable vibration isolation performance than the linear vertical damping; c) compared to a conventional QZS isolator compensated by a linear spring, the proposed device has a low resonance frequency , slighter offsets, and reduced static deformation .