28th Congress of the International Council of the Aeronautical Sciences, 23 - 28 September 2012, Brisbane, Australia
Paper ICAS2012-P3.8

WAVELET-BASED ACTIVE SENSING FOR QUANTITATIVE ASSESSMENT OF THROUGH-THICKNESS CRACK SIZE AND ANGLE IN COMPOSITE PLATES

Z. Soltani, M. Ekhtiari, A. Abedian
Sharif Univ. of Technology, Iran

Keywords: lamb waves, piezoelectric active sensor, composite plate, finite element method, wavelet transform

A dual-PZT actuation scheme is applied to generate the fundamental symmetric Lamb wave mode, on quasi-isotropic CF-EP laminate plate. Then a wavelet-based signal processing SHM technique is developed to detect through-thickness crack of different sizes/angels and the response signals are processed to extract damage-sensitive features from the original signals.

view full paper