Loveday, Philip WWilcox, PD2010-07-142010-07-142010-03Loveday, PW and Wilcox, PD. 2010. Guided wave propagation as a measure of axial loads in rails. Health Monitoring of Structural and Biological Systems, Proceedings of SPIE, Vol. 7650, pp 1-8http://hdl.handle.net/10204/4078https://www.spiedigitallibrary.org/conference-proceedings-of-spie/7650/765023/Guided-wave-propagation-as-a-measure-of-axial-loads-in/10.1117/12.847531.fullhttps://doi.org/10.1117/12.847531Copyright 2010 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibitedGuided 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.enGuided wave propagationRailsAxial load measurementSemi-analytical finite element methodConference PresentationLoveday, P. W., & Wilcox, P. (2010). Guided wave propagation as a measure of axial loads in rails. Society of Photo-optical Instrumentation Engineers (SPIE). http://hdl.handle.net/10204/4078Loveday, Philip W, and PD Wilcox. "Guided wave propagation as a measure of axial loads in rails." (2010): http://hdl.handle.net/10204/4078Loveday PW, Wilcox P, Guided wave propagation as a measure of axial loads in rails; Society of Photo-optical Instrumentation Engineers (SPIE); 2010. http://hdl.handle.net/10204/4078 .TY - Conference Presentation AU - Loveday, Philip W AU - Wilcox, PD AB - 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. DA - 2010-03 DB - ResearchSpace DP - CSIR KW - Guided wave propagation KW - Rails KW - Axial load measurement KW - Semi-analytical finite element method LK - https://researchspace.csir.co.za PY - 2010 T1 - Guided wave propagation as a measure of axial loads in rails TI - Guided wave propagation as a measure of axial loads in rails UR - http://hdl.handle.net/10204/4078 ER -