Guided wave propagation as a measure of axial loads in rails

Philip W. Loveday, Paul D. Wilcox

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

21 Citations (Scopus)

Abstract

Guided wave propagation has been proposed as a means to monitor the axial loads in continuously welded railway rails although no practical system has been developed. In this paper, the influence of axial load on the guided wave propagation characteristics was analyzed using the semi-analytical finite element method, extended to include axial loads. Forty modes of propagation were analyzed up to a maximum frequency of 100 kHz. The sensitivity of the modes to axial load or changes in elastic modulus was formulated analytically and computed. In practice, by using separation of signals in time it would only be possible to separate the mode with the greatest group velocity over a reasonable distance. It was found that the influence of axial load on the wavelength of such a mode should be measureable. However, the influence of changes in the elastic modulus due to temperature is expected to be an order of magnitude larger. In order to develop a practical measurement technique it would be necessary to eliminate or compensate for this and other influences.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume7650
EditionPART 1
DOIs
Publication statusPublished - 18 Jun 2010
EventHealth Monitoring of Structural and Biological Systems 2010 - San Diego, CA, United Kingdom
Duration: 8 Mar 201011 Mar 2010

Conference

ConferenceHealth Monitoring of Structural and Biological Systems 2010
CountryUnited Kingdom
CitySan Diego, CA
Period8/03/1011/03/10

Keywords

  • Axial load measurement
  • Guided wave propagation
  • Rail
  • SAFE
  • Semi-analytical finite element method

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