The University of Southampton
University of Southampton Institutional Repository

Wheel-rail noise : theoretical modelling of the generation of vibrations

Wheel-rail noise : theoretical modelling of the generation of vibrations
Wheel-rail noise : theoretical modelling of the generation of vibrations

The rolling of a wheel on a rail is an important source of noise from railways, particularly as the speeds of trains increase. This noise is known to emanate from the structural vibrations of the wheels and rails. A theoretical study is presented of the mechanisms which generate these wheel and rail vibrations. Mathematical models of the vibrational response of a wheel and a rail are developed. These are then coupled in a linear frequency-domain model through a multi-degree-of-freedom contact zone, described by its receptances. Excitation due to the surface roughness profiles of the wheel and rail is considered in detail. This generates a relative displacement input between the wheel and the rail in the vertical direction. The predicted responses of the wheel and rail generally correspond well to measured data, although some discrepancies are noted. The effect of the rotation of the wheel is incorporated into the model, and is seen to improve the form of the response. Remaining discrepancies can be attributed to lack of precision in wheel modal data, and to systematic errors in the experimental results. Parametric studies are presented of the overall model. They show, amongst other things, that, to reduce the wheel vibration, added wheel damping needs to be greater than would be expected from free wheel receptances. Reduction of noise from the rail is a less surmountable problem; very high levels of damping would be needed to reduce the radiating length significantly. Alternative excitation mechanisms are discussed, such as the lateral movement of the contact, and absolute as well as relative force inputs.

University of Southampton
Thompson, D. J
ac2fd95d-9af1-40eb-899f-1bbbfff84670
Thompson, D. J
ac2fd95d-9af1-40eb-899f-1bbbfff84670

Thompson, D. J (1990) Wheel-rail noise : theoretical modelling of the generation of vibrations. University of Southampton, Doctoral Thesis.

Record type: Thesis (Doctoral)

Abstract

The rolling of a wheel on a rail is an important source of noise from railways, particularly as the speeds of trains increase. This noise is known to emanate from the structural vibrations of the wheels and rails. A theoretical study is presented of the mechanisms which generate these wheel and rail vibrations. Mathematical models of the vibrational response of a wheel and a rail are developed. These are then coupled in a linear frequency-domain model through a multi-degree-of-freedom contact zone, described by its receptances. Excitation due to the surface roughness profiles of the wheel and rail is considered in detail. This generates a relative displacement input between the wheel and the rail in the vertical direction. The predicted responses of the wheel and rail generally correspond well to measured data, although some discrepancies are noted. The effect of the rotation of the wheel is incorporated into the model, and is seen to improve the form of the response. Remaining discrepancies can be attributed to lack of precision in wheel modal data, and to systematic errors in the experimental results. Parametric studies are presented of the overall model. They show, amongst other things, that, to reduce the wheel vibration, added wheel damping needs to be greater than would be expected from free wheel receptances. Reduction of noise from the rail is a less surmountable problem; very high levels of damping would be needed to reduce the radiating length significantly. Alternative excitation mechanisms are discussed, such as the lateral movement of the contact, and absolute as well as relative force inputs.

Text
363337.pdf - Version of Record
Available under License University of Southampton Thesis Licence.
Download (10MB)

More information

Published date: 1990

Identifiers

Local EPrints ID: 461783
URI: http://eprints.soton.ac.uk/id/eprint/461783
PURE UUID: 0c5fe1b9-8cec-4bf7-9592-f02e177a1319

Catalogue record

Date deposited: 04 Jul 2022 18:54
Last modified: 04 Jul 2022 20:22

Export record

Contributors

Author: D. J Thompson

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×