A quasi-zero-stiffness isolator with a shear-thinning viscous damper

doi:10.1007/s10483-022-2829-9

Abstract

Abstract: Quasi-zero-stiffness (QZS) vibration isolators have been widely studied, because they show excellent high static and low dynamic stiffnesses and can effectively solve low-frequency and ultralow-frequency vibration. However, traditional QZS (T-QZS) vibration isolators usually adopt linear damping, owing to which achieving good isolation performance at both low and high frequencies is difficult. T-QZS isolators exhibit hardening stiffness characteristics, and their vibration isolation performance is even worse than that of linear vibration isolators under a large excitation amplitude. Therefore, this study proposes a QZS isolator with a shear-thinning viscous damper (SVD) to improve the vibration isolation performance of the T-QZS isolators. The force-velocity relation of the SVD is obtained, and a dynamic model is established for the isolator. The dynamic responses of the system are solved using the harmonic balance method (HBM) and the Runge-Kutta method. The vibration isolation performance of the system is evaluated using force transmissibility, and the isolator parameters are analyzed. The results show that compared with the T-QZS isolators, the proposed QZS-SVD isolator achieves the lower initial vibration isolation frequency and peak value, and exhibits better vibration isolation performance at medium and high frequencies. Moreover, the proposed isolator can withstand a large excitation amplitude in the effective vibration isolation range.

Key words: quasi-zero-stiffness (QZS) isolator, shear-thinning viscous damper (SVD), vibration isolation, force transmissibility

2010 MSC Number:

74H45

Guilin WEN, Yu LIN, Junfeng HE. A quasi-zero-stiffness isolator with a shear-thinning viscous damper. Applied Mathematics and Mechanics (English Edition), 2022, 43(3): 311-326.

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URL: https://www.amm.shu.edu.cn/EN/10.1007/s10483-022-2829-9

https://www.amm.shu.edu.cn/EN/Y2022/V43/I3/311

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