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Books > Science & Mathematics > Physics > Classical mechanics > Sound, vibration & waves (acoustics)
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Rail Crack Monitoring Using Acoustic Emission Technique (Hardcover, 1st ed. 2018)
Loot Price: R3,389
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Rail Crack Monitoring Using Acoustic Emission Technique (Hardcover, 1st ed. 2018)
Series: Springer Theses
Expected to ship within 10 - 15 working days
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Total price: R3,409
Discovery Miles: 34 090
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This thesis provides an innovative strategy for rail crack
monitoring using the acoustic emission (AE) technique. The field
study presented is a significant improvement on laboratory studies
in the literature in terms of complex rail profile and crack
conditions as well as high operational noise. AE waves induced by
crack propagation, crack closure, wheel-rail impact and operational
noise were obtained through a series of laboratory and field tests,
and analyzed by wavelet transform (WT) and synchrosqueezed wavelet
transform (SWT). A wavelet power-based index and the enhanced SWT
scalogram were sequentially proposed to classify AE waves induced
by different mechanisms according to their energy distributions in
the time-frequency domain. A novel crack sizing method taking
advantage of crack closure-induced AE waves was developed based on
fatigue tests in the laboratory. The propagation characteristics of
AE waves in the rail were investigated, and Tsallis synchrosqueezed
wavelet entropy (TSWE) with time was finally brought forward to
detect and locate rail cracks in the field. The proposed strategy
for detection, location and sizing of rail cracks helps to ensure
the safe and smooth operation of the railway system. This thesis is
of interest to graduate students, researchers and practitioners in
the area of structural health monitoring.
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