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

Guilin WEN, Yu LIN, Junfeng HE

doi:10.1007/s10483-022-2829-9

Applied Mathematics and Mechanics >

2022 , Vol. 43 >Issue 3: 311 - 326

DOI: https://doi.org/10.1007/s10483-022-2829-9

Articles

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

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1. School of Mechanical and Electrical Engineering, Guangzhou University, Guangzhou 510006, China;
2. School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, Hebei Province, China

Received date: 2021-08-19

Revised date: 2022-01-05

Online published: 2022-02-22

Supported by

the Key Program of National Natural Science Foundation of China (No. 11832009), the National Natural Science Foundation of China (Nos. 11902085 and 12172095), and the Natural Science Foundation of Guangdong Province of China (No. 2021A1515010320)

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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

Cite this article

Guilin WEN, Yu LIN, Junfeng HE . A quasi-zero-stiffness isolator with a shear-thinning viscous damper[J]. Applied Mathematics and Mechanics, 2022 , 43(3) : 311 -326 . DOI: 10.1007/s10483-022-2829-9

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