Fracture source location in thin plates using the wavelet transform of dispersive waves
- 1 May 2000
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
- Vol. 47 (3), 612-619
- https://doi.org/10.1109/58.842048
Abstract
A new signal processing approach was presented for acoustic emission source location using the dispersive waves in a thin plate. For wave propagation in dispersive media, the accuracy of source location can be improved by using the arrival times of a single frequency component in the output signals at an array of sensors. The wavelet transform (WT) was used to resolve this problem. By utilizing the time-frequency data of the WT, the frequency-dependent arrival time traveling with the group velocity was shown to be easily determined. Experiments were performed using a lead break as the simulated fracture source on the surface of an aluminum plate. Two plate modes corresponding to the S/sub 0/ and A/sub 0/ Lamb waves were identified, and their group velocities were accurately measured. The source location results based on the WT method agreed well with the true locations. The WT method was also compared with the cross correlation technique, and both methods provide similar results.Keywords
This publication has 5 references indexed in Scilit:
- Experimental wavelet analysis of flexural waves in beamsExperimental Mechanics, 1996
- Time Frequency Analysis of Dispersive Waves by Means of Wavelet TransformJournal of Applied Mechanics, 1995
- An Introduction to WaveletsComputers in Physics, 1992
- Source location in thin plates using cross-correlationThe Journal of the Acoustical Society of America, 1991
- Acoustic-emission source location in two dimensions by an array of three sensorsNon-Destructive Testing, 1976