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Demonstrator to show the effects of negative stiffness on the natural frequency of a simple oscillator

Demonstrator to show the effects of negative stiffness on the natural frequency of a simple oscillator
Demonstrator to show the effects of negative stiffness on the natural frequency of a simple oscillator
This article describes a demonstrator to show the effects of negative stiffness on the free vibration of a simple oscillator. The test rig consists of a horizontal beam that is hinged at one end and is supported by two coil springs to form a single-degree-of-freedom system. Additional correction springs, which provide negative stiffness, can be attached to lower the natural frequency of the system. The effect of the change in natural frequency can be easily seen visually, and it is shown that for one of the configurations of correction springs, the natural frequency can be reduced by a factor of about 4.
negative stiffness, low natural frequency, vibration isolation
0954-4062
1189-1192
Carrella, A.
1a1904a5-80c2-435a-b3d4-2e26d87ece61
Brennan, M.J.
87c7bca3-a9e5-46aa-9153-34c712355a13
Waters, T.P.
348d22f5-dba1-4384-87ac-04fe5d603c2f
Carrella, A.
1a1904a5-80c2-435a-b3d4-2e26d87ece61
Brennan, M.J.
87c7bca3-a9e5-46aa-9153-34c712355a13
Waters, T.P.
348d22f5-dba1-4384-87ac-04fe5d603c2f

Carrella, A., Brennan, M.J. and Waters, T.P. (2008) Demonstrator to show the effects of negative stiffness on the natural frequency of a simple oscillator. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 222 (7), 1189-1192. (doi:10.1243/09544062JMES1012).

Record type: Article

Abstract

This article describes a demonstrator to show the effects of negative stiffness on the free vibration of a simple oscillator. The test rig consists of a horizontal beam that is hinged at one end and is supported by two coil springs to form a single-degree-of-freedom system. Additional correction springs, which provide negative stiffness, can be attached to lower the natural frequency of the system. The effect of the change in natural frequency can be easily seen visually, and it is shown that for one of the configurations of correction springs, the natural frequency can be reduced by a factor of about 4.

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More information

Published date: 14 February 2008
Keywords: negative stiffness, low natural frequency, vibration isolation

Identifiers

Local EPrints ID: 65214
URI: https://eprints.soton.ac.uk/id/eprint/65214
ISSN: 0954-4062
PURE UUID: caf04c87-4e94-4ae2-8eb5-311a94943446

Catalogue record

Date deposited: 12 Feb 2009
Last modified: 13 Mar 2019 20:19

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