Theoretical modelling of railway curve squeal
Theoretical modelling of railway curve squeal
Railway curve squeal is an environmental noise problem occurring occasionally when a vehicle is negotiating a sharp curve. A theoretical study is carried out to develop a complete model, which can predict curve squeal and may provide useful approaches to control it.
The curve squeal results from a kind of self-excited vibration existing in the wheel/rail contact system, mainly due to the falling friction coefficient when sliding occurs between the wheel and rail surfaces. The central work of this thesis is to build a self-excited feedback loop model, representing relations between the wheel/rail motions and the contact forces. The stability analysis of this loop can predict the possibility of squeal, while the time-domain integration of the loop can provide the intensity of squeal.
A twin-disc rig, with a wheel disc rolling on a rail disc, was used to investigate the squeal phenomenon and validate the wheel/rail squeal model. With this rig, the lateral forces acting on the discs due to varying amounts of lateral creepage can be measured in a controlled environment, as well as the acoustic and vibration responses of the discs. According to the experimental results, the falling friction in sliding is closely related to the self-excited vibration and hence the occurrence of squeal.
The curve squeal prediction is applied for all four wheel/rail contacts in a bogie. The results show that squeal is prone to occur at the leading wheels of a bogie, mainly due to the large lateral steady-state creepage. The leading outer wheel in flange contact has less possibility for squeal than the leading inner one. The trailing wheels are unlikely to squeal. Both a wheel damping treatment and friction modification can be used to control the squeal, but will not always be effective.
University of Southampton
Huang, Zhenyu
0aed8c31-b097-4fcc-811d-69fd0916de4f
2007
Huang, Zhenyu
0aed8c31-b097-4fcc-811d-69fd0916de4f
Huang, Zhenyu
(2007)
Theoretical modelling of railway curve squeal.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Railway curve squeal is an environmental noise problem occurring occasionally when a vehicle is negotiating a sharp curve. A theoretical study is carried out to develop a complete model, which can predict curve squeal and may provide useful approaches to control it.
The curve squeal results from a kind of self-excited vibration existing in the wheel/rail contact system, mainly due to the falling friction coefficient when sliding occurs between the wheel and rail surfaces. The central work of this thesis is to build a self-excited feedback loop model, representing relations between the wheel/rail motions and the contact forces. The stability analysis of this loop can predict the possibility of squeal, while the time-domain integration of the loop can provide the intensity of squeal.
A twin-disc rig, with a wheel disc rolling on a rail disc, was used to investigate the squeal phenomenon and validate the wheel/rail squeal model. With this rig, the lateral forces acting on the discs due to varying amounts of lateral creepage can be measured in a controlled environment, as well as the acoustic and vibration responses of the discs. According to the experimental results, the falling friction in sliding is closely related to the self-excited vibration and hence the occurrence of squeal.
The curve squeal prediction is applied for all four wheel/rail contacts in a bogie. The results show that squeal is prone to occur at the leading wheels of a bogie, mainly due to the large lateral steady-state creepage. The leading outer wheel in flange contact has less possibility for squeal than the leading inner one. The trailing wheels are unlikely to squeal. Both a wheel damping treatment and friction modification can be used to control the squeal, but will not always be effective.
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Published date: 2007
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Local EPrints ID: 466309
URI: http://eprints.soton.ac.uk/id/eprint/466309
PURE UUID: 6fdeedeb-06a0-4275-9727-048af8d8bc98
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Date deposited: 05 Jul 2022 05:09
Last modified: 16 Mar 2024 20:37
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Author:
Zhenyu Huang
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