The theory of a continuous damped vibration absorber to reduce broad-band wave propagation in beams
The theory of a continuous damped vibration absorber to reduce broad-band wave propagation in beams
In order to attenuate structural waves in beams, a damped mass-spring absorber system is considered that is attached continuously along the beam length. Compared with other measures, such as impedance changes or tuned neutralisers applied at a single point, it is effective for excitation at any location along the beam. Although it is a tuned system, it can also be designed to be effective over a broad frequency range by the use of a high damping loss factor and multiple tuning frequencies. It has the advantage over constrained layer damping treatments that it can be effective even when the structural wavelength is long. The parameters controlling its behaviour are investigated and simple formulae developed, allowing optimisation of its performance. A particular application is the reduction of noise from a railway track, which requires the attenuation of structural waves along the rail to be increased typically in the frequency range 500 to 2000 Hz
Institute of Sound and Vibration Research, University of Southampton
Thompson, D.J.
bca37fd3-d692-4779-b663-5916b01edae5
2007
Thompson, D.J.
bca37fd3-d692-4779-b663-5916b01edae5
Thompson, D.J.
(2007)
The theory of a continuous damped vibration absorber to reduce broad-band wave propagation in beams
(ISVR Technical Memorandum, 968)
Southampton, UK.
Institute of Sound and Vibration Research, University of Southampton
52pp.
Record type:
Monograph
(Project Report)
Abstract
In order to attenuate structural waves in beams, a damped mass-spring absorber system is considered that is attached continuously along the beam length. Compared with other measures, such as impedance changes or tuned neutralisers applied at a single point, it is effective for excitation at any location along the beam. Although it is a tuned system, it can also be designed to be effective over a broad frequency range by the use of a high damping loss factor and multiple tuning frequencies. It has the advantage over constrained layer damping treatments that it can be effective even when the structural wavelength is long. The parameters controlling its behaviour are investigated and simple formulae developed, allowing optimisation of its performance. A particular application is the reduction of noise from a railway track, which requires the attenuation of structural waves along the rail to be increased typically in the frequency range 500 to 2000 Hz
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Published date: 2007
Identifiers
Local EPrints ID: 45668
URI: http://eprints.soton.ac.uk/id/eprint/45668
PURE UUID: 449a88ae-2ac6-40a2-b1d0-2ed237d8f767
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Date deposited: 16 Apr 2007
Last modified: 16 Mar 2024 02:54
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