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On the effects of mistuning a force-excited system containing a quasi-zero-stiffness vibration isolator

On the effects of mistuning a force-excited system containing a quasi-zero-stiffness vibration isolator
On the effects of mistuning a force-excited system containing a quasi-zero-stiffness vibration isolator
Nonlinear isolators with high-static-low-dynamic-stiffness have received considerable attention in the recent literature due to their performance benefits compared to linear vibration isolators. A quasi-zero-stiffness (QZS) isolator is a particular case of this type of isolator, which has a zero dynamic stiffness at the static equilibrium position. These types of isolators can be used to achieve very low frequency vibration isolation, but a drawback is that they have purely hardening stiffness behavior. If something occurs to destroy the symmetry of the system, for example, by an additional static load being applied to the isolator during operation, or by the incorrect mass being suspended on the isolator, then the isolator behavior will change dramatically. The question is whether this will be detrimental to the performance of the isolator and this is addressed in this paper. The analysis in this paper shows that although the asymmetry will degrade the performance of the isolator compared to the perfectly tuned case, it will still perform better than the corresponding linear isolator provided that the amplitude of excitation is not too large.
1048-9002
Abolfathi, A.
5992bc45-5bfd-42ba-9b7e-39c4b9789bca
Brennan, M.J.
7f39b4f4-810d-49d5-be90-1656c7b8069a
Waters, T.P.
348d22f5-dba1-4384-87ac-04fe5d603c2f
Tang, Bin
13169489-4339-48f5-b709-67b509c08f04
Abolfathi, A.
5992bc45-5bfd-42ba-9b7e-39c4b9789bca
Brennan, M.J.
7f39b4f4-810d-49d5-be90-1656c7b8069a
Waters, T.P.
348d22f5-dba1-4384-87ac-04fe5d603c2f
Tang, Bin
13169489-4339-48f5-b709-67b509c08f04

Abolfathi, A., Brennan, M.J., Waters, T.P. and Tang, Bin (2015) On the effects of mistuning a force-excited system containing a quasi-zero-stiffness vibration isolator. Journal of Vibration and Acoustics, 137 (4). (doi:10.1115/1.4029689).

Record type: Article

Abstract

Nonlinear isolators with high-static-low-dynamic-stiffness have received considerable attention in the recent literature due to their performance benefits compared to linear vibration isolators. A quasi-zero-stiffness (QZS) isolator is a particular case of this type of isolator, which has a zero dynamic stiffness at the static equilibrium position. These types of isolators can be used to achieve very low frequency vibration isolation, but a drawback is that they have purely hardening stiffness behavior. If something occurs to destroy the symmetry of the system, for example, by an additional static load being applied to the isolator during operation, or by the incorrect mass being suspended on the isolator, then the isolator behavior will change dramatically. The question is whether this will be detrimental to the performance of the isolator and this is addressed in this paper. The analysis in this paper shows that although the asymmetry will degrade the performance of the isolator compared to the perfectly tuned case, it will still perform better than the corresponding linear isolator provided that the amplitude of excitation is not too large.

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Published date: August 2015
Organisations: Dynamics Group

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Local EPrints ID: 375500
URI: https://eprints.soton.ac.uk/id/eprint/375500
ISSN: 1048-9002
PURE UUID: 7d54dab2-708b-43a6-bb53-ec2b15f4f9e5

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Date deposited: 27 Mar 2015 14:17
Last modified: 17 Jul 2017 21:16

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Contributors

Author: A. Abolfathi
Author: M.J. Brennan
Author: T.P. Waters
Author: Bin Tang

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