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Predicting the effect of temperature on the performance of elastomer-based rail damping devices

Predicting the effect of temperature on the performance of elastomer-based rail damping devices
Predicting the effect of temperature on the performance of elastomer-based rail damping devices
Rail dampers have been developed in recent years, formed by an elastomeric material and embedded steel masses. The loss factor and stiffness of the elastomer are very important for the performance of the system but, unfortunately, both are sensitive to changes in the temperature. Although having a high loss factor gives good noise reduction, it also means greater variation of stiffness, and consequently tuning frequency, with temperature. To investigate the effect of the temperature on the performance of a generic rail damper, a Timoshenko beam model of the track is used, to which is added a single-frequency tuned absorber. The noise reduction at each frequency is found from the ratio of the decay rates of treated and untreated beams. This is introduced into a typical noise spectrum obtained using TWINS. Account is next taken of the physical link between the damping loss factor and the stiffness variation with temperature. By assuming a constant loss factor, the rate of change of stiffness with log frequency is established. Then, using the time-temperature superposition principle, this can be expressed in terms of a temperature-dependence. This is finally used in the prediction of decay rates and thereby noise reduction. The results allow the relative importance of a high loss factor or a temperature-independent stiffness to be assesse
978-3-540-74892-2
299-305
Springer Berlin
Ahmad, N.
d2ca1654-dcdf-4508-ac20-c1912fe44785
Thompson, David J.
bca37fd3-d692-4779-b663-5916b01edae5
Jones, C.J.C.
695ac86c-2915-420c-ac72-3a86f98d3301
Muhr, A.H.
cca0958a-7c9e-466b-be54-3369745fe26d
Schulte-Werning, Burkhard
Thompson, David J.
Gautier, Pierre-Etienne
Hanson, Carl
Hemsworth, Brian
Nelson, James
Maeda, Tatsuo
de Vos, Paul
Ahmad, N.
d2ca1654-dcdf-4508-ac20-c1912fe44785
Thompson, David J.
bca37fd3-d692-4779-b663-5916b01edae5
Jones, C.J.C.
695ac86c-2915-420c-ac72-3a86f98d3301
Muhr, A.H.
cca0958a-7c9e-466b-be54-3369745fe26d
Schulte-Werning, Burkhard
Thompson, David J.
Gautier, Pierre-Etienne
Hanson, Carl
Hemsworth, Brian
Nelson, James
Maeda, Tatsuo
de Vos, Paul

Ahmad, N., Thompson, David J., Jones, C.J.C. and Muhr, A.H. (2008) Predicting the effect of temperature on the performance of elastomer-based rail damping devices. Schulte-Werning, Burkhard, Thompson, David J., Gautier, Pierre-Etienne, Hanson, Carl, Hemsworth, Brian, Nelson, James, Maeda, Tatsuo and de Vos, Paul (eds.) In Noise and Vibration Mitigation for Rail Transportation Systems: Proceedings of the 9th International Workshop on Railway Noise, Munich Germany 4-8 September 2007. vol. 99, Springer Berlin. pp. 299-305 . (doi:10.1007/978-3-540-74893-9).

Record type: Conference or Workshop Item (Paper)

Abstract

Rail dampers have been developed in recent years, formed by an elastomeric material and embedded steel masses. The loss factor and stiffness of the elastomer are very important for the performance of the system but, unfortunately, both are sensitive to changes in the temperature. Although having a high loss factor gives good noise reduction, it also means greater variation of stiffness, and consequently tuning frequency, with temperature. To investigate the effect of the temperature on the performance of a generic rail damper, a Timoshenko beam model of the track is used, to which is added a single-frequency tuned absorber. The noise reduction at each frequency is found from the ratio of the decay rates of treated and untreated beams. This is introduced into a typical noise spectrum obtained using TWINS. Account is next taken of the physical link between the damping loss factor and the stiffness variation with temperature. By assuming a constant loss factor, the rate of change of stiffness with log frequency is established. Then, using the time-temperature superposition principle, this can be expressed in terms of a temperature-dependence. This is finally used in the prediction of decay rates and thereby noise reduction. The results allow the relative importance of a high loss factor or a temperature-independent stiffness to be assesse

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Published date: 10 April 2008
Organisations: Dynamics Group

Identifiers

Local EPrints ID: 148637
URI: https://eprints.soton.ac.uk/id/eprint/148637
ISBN: 978-3-540-74892-2
PURE UUID: e635f010-fb4c-4583-bf79-50c7d5f63def
ORCID for David J. Thompson: ORCID iD orcid.org/0000-0002-7964-5906

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Date deposited: 28 Apr 2010 13:00
Last modified: 20 Jul 2019 01:16

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