Q. M. Chen
Y. S. Ho
T. P. Leung
Dept. of Mech. and Marine Eng., The Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong
In the test of continual acoustic emission due to leakage, the rms was used to evaluate the energy of AE signals. However, the value of rms strongly relates to measuring conditions, including sensitivity of sensor, mounting pressure, setting amplification, etc. Detecting points of sharp variation of AE signals by wavelet transform to evaluate leakage is explored in this paper. The parameter evaluating leakage is sample zero-crossing counts of wavelet transform at each scale. Based on the sharp variation of AE signals instead of amplitude, this method is robust to measuring conditions. The experimental results obtained under different test conditions demonstrates the applicability of the method.