This paper presents experimental study on dispersive waves propagation in steel rails. The propagation of longitudinal and transverse waves was generated by an impulse hammer and measured in three points. Wavelet transform (WT) and short time Fourier transform (STFT) were applied to analyze the time signals. Analysis of signal by STFT does not provide a proper time-frequency representation due to a fixed size window but the wavelet transform based on complex wavelet is similar to STFT, because the shape of the complex wavelet resembles the Gaussian window. The different wavelet widths for different frequencies produce a time-frequency plane of high resolution. The wavelet transform can effectively identify the time-frequency components in waves and allows the estimation of group velocity. The wavelet signal processing of the experimental wave propagation signals is intended to be used for rail flaw detection. The time-frequency plane will be applied to dispersive wave propagation in rails with defects for damage localization and its size estimation.
Guided waves in steel rails - experimental works and wavelet signal processing
Geführte Schallwelle in Eisenbahnschienen - Experimente und Wavelet-Signalverarbeitung
2007
6 Seiten, 8 Bilder, 7 Quellen
Conference paper
English
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