Wavelet transform of dynamic response data,experimentally acquired using a piezoelectric sensor, ispresented as a local non-destructive evaluation technique forlocating damage in a beam. The higher consistency and accuracy ofthe results based on data from a piezoelectric sensor over aconventional strain gauge are demonstrated. The allowable rangeof wavelet scale to process the data is shown to be dependenton the sampling rate, filter frequency and length of signal,where edge effects due to transformation must also be consideredin the latter. By estimating the wave arrival times based ontheoretical flexural wave velocity, the approximate waveletscale to process the data can be determined. Further processingof the signal at a finer wavelet scale is necessary to improvethe accuracy. Based on experimental data, the method is shownto be robust with respect to boundary and damage conditions aswell as impact position.
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