Defect Detection and Location in Switch Rails by Acoustic Emission and Lamb Wave Analysis: A Feasibility Study
An acoustic emission (AE) based approach is proposed in this study to identify and locate newly initiated defects or the propagation of existing defects in railroad switch rails. Defect-induced AE signals are identified through frequency analysis, as frequencies of these signals are much higher than those induced by structural vibration. Continuous wavelet transform (CWT) is employed to analyze the Lamb wave dispersion of the detected signal, so that two characteristic points can be selected on the CWT contour map to locate the defect. Using this approach, defects in a damaged switch rail can be located using a single sensor.
J. Zhang et al., "Defect Detection and Location in Switch Rails by Acoustic Emission and Lamb Wave Analysis: A Feasibility Study," Applied Acoustics, vol. 105, pp. 67-74, Elsevier Ltd, Apr 2016.
The definitive version is available at http://dx.doi.org/10.1016/j.apacoust.2015.11.018
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Acoustic Emissions; Acoustics; Defects; Structural Dynamics; Surface Waves; Ultrasonic Waves; Vibration Analysis; Wavelet Transforms; Characteristic Point; Continuous Wavelet Transform; Continuous Wavelet Transforms; Feasibility Studies; Frequency; Frequency Analysis; Rail Inspections; Structural Vibrations; Acoustic Emission Testing; Lamb Wave
International Standard Serial Number (ISSN)
Article - Journal
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