• CN: 11-2187/TH
  • ISSN: 0577-6686

›› 2004, Vol. 40 ›› Issue (7): 136-140.

• Article • Previous Articles     Next Articles

TECHNIQUE OF ACOUSTIC EMISSION SOURCE LOCATING BASED ON WAVELET ANALYSIS

Li Guanghai;Liu Shifeng   

  1. Department of Mechanical Engineering, Tsinghua University
  • Published:2004-07-15

Abstract: The technique of acoustic emission (AE) signal full waveform acquisition provides possibility of source location based on waveform analysis. The modal of the AE signal propagation in a plate is complicated. The arrival time and the group velocity are various. These factors lead to the error of AE source location. A new approach based on time-frequency- amplitude (TFA) transform is introduced to locate AE sources. In the received signal, the behaviors of a certain frequency flexural mode wave are found by using wavelet transform. Theoretical analysis shows that the peak of the magnitude of separating signal is related to the arrival time of the flexural mode wave group velocity. Using the arrival time and the group velocity, which measured in the filed, the AE source can be located more precise. Experimental result shows that AE source location based on the TFA method agreed well with the actual location.

Key words: Acoustic emission, Source location, Wavelet analysis

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