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On the design of a high-static-low-dynamic stiffness isolator using linear mechanical springs and magnets

On the design of a high-static-low-dynamic stiffness isolator using linear mechanical springs and magnets
On the design of a high-static-low-dynamic stiffness isolator using linear mechanical springs and magnets
The frequency range over which a linear passive vibration isolator is effective is often limited by the mount stiffness required to support a static load. This can be improved upon by incorporating a negative stiffness element in the mount such that the dynamic stiffness is much less than the static stiffness. In this case, it can be referred to as a high-static–low-dynamic stiffness (HSLDS) mount. This paper is concerned with a theoretical and experimental study of one such mount. It comprises two vertical mechanical springs between which an isolated mass is mounted. At the outer edge of each spring, there is a permanent magnet. In the experimental work reported here, the isolated mass is also a magnet arranged so that it is attracted by the other magnets. Thus, the combination of magnets acts as a negative stiffness counteracting the positive stiffness provided by the mechanical springs. Although the HSLDS suspension system will inevitably be nonlinear, it is shown that for small oscillations the mount considered here is linear. The measured transmissibility is compared with a comparable linear mass–spring–damper system to show the advantages offered by the HSLDS mount.
0022-460X
712-720
Carrella, A.
1a1904a5-80c2-435a-b3d4-2e26d87ece61
Brennan, M.J.
87c7bca3-a9e5-46aa-9153-34c712355a13
Waters, T.P.
348d22f5-dba1-4384-87ac-04fe5d603c2f
Shin, K.
63e6e88d-eea1-4bd3-843e-87ad2193c16d
Carrella, A.
1a1904a5-80c2-435a-b3d4-2e26d87ece61
Brennan, M.J.
87c7bca3-a9e5-46aa-9153-34c712355a13
Waters, T.P.
348d22f5-dba1-4384-87ac-04fe5d603c2f
Shin, K.
63e6e88d-eea1-4bd3-843e-87ad2193c16d

Carrella, A., Brennan, M.J., Waters, T.P. and Shin, K. (2008) On the design of a high-static-low-dynamic stiffness isolator using linear mechanical springs and magnets. Journal of Sound and Vibration, 315 (3), 712-720. (doi:10.1016/j.jsv.2008.01.046).

Record type: Article

Abstract

The frequency range over which a linear passive vibration isolator is effective is often limited by the mount stiffness required to support a static load. This can be improved upon by incorporating a negative stiffness element in the mount such that the dynamic stiffness is much less than the static stiffness. In this case, it can be referred to as a high-static–low-dynamic stiffness (HSLDS) mount. This paper is concerned with a theoretical and experimental study of one such mount. It comprises two vertical mechanical springs between which an isolated mass is mounted. At the outer edge of each spring, there is a permanent magnet. In the experimental work reported here, the isolated mass is also a magnet arranged so that it is attracted by the other magnets. Thus, the combination of magnets acts as a negative stiffness counteracting the positive stiffness provided by the mechanical springs. Although the HSLDS suspension system will inevitably be nonlinear, it is shown that for small oscillations the mount considered here is linear. The measured transmissibility is compared with a comparable linear mass–spring–damper system to show the advantages offered by the HSLDS mount.

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More information

Published date: 19 August 2008
Organisations: Dynamics Group

Identifiers

Local EPrints ID: 57804
URI: https://eprints.soton.ac.uk/id/eprint/57804
ISSN: 0022-460X
PURE UUID: 031af021-4836-4399-b5f8-fd5f19c66323

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Date deposited: 20 Aug 2008
Last modified: 13 Mar 2019 20:33

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