Force transmissibility of a two-stage vibration isolation system with quasi-zero stiffness

Wang, Xinlong, Zhou, Jiaxi, Xu, Daolin, Ouyang, Huajiang ORCID: 0000-0003-0312-0326 and Duan, Yong (2017) Force transmissibility of a two-stage vibration isolation system with quasi-zero stiffness. NONLINEAR DYNAMICS, 87 (1). pp. 633-646.

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Abstract

A quasi-zero stiffness (QZS) vibration isolator outperforms other passive control strategies in vibration attenuation especially in a low-frequency band, but it also has an intrinsic limitation of low roll-off rate in the effective frequency range of vibration isolation. To overcome this limitation, a two-stage QZS vibration isolation system (VIS) is proposed, in which the QZS feature is realized by combining a vertical liner spring with two parallel cam–roller–spring mechanisms. Considering a possible disengagement between the cam and the roller under large amplitude vibration, a piecewise nonlinear dynamical model is developed and approximately solved by the averaging method. The analytical solutions for amplitude–frequency relationship and force transmissibility are derived. The results reveal that the two-stage QZS VIS has both advantages of low-frequency vibration isolation and high roll-off rate. It is also found that the second resonance can be eliminated when heavy damping is present in the upper stage, and hence, a broader effective frequency range of isolation can be achieved. High intermediate mass and soft vertical springs in the lower stage are also found to result in high-quality isolation performance.

Item Type:	Article
Uncontrolled Keywords:	Two-stage vibration isolation, Quasizero stiffness, Piecewise nonlinear dynamics, Cam-roller-spring mechanism
Depositing User:	Symplectic Admin
Date Deposited:	03 Nov 2016 10:24
Last Modified:	19 Jan 2023 07:26
DOI:	10.1007/s11071-016-3065-x
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3004274