关键词: 小波包能量谱分析, 超声导波, 压电晶片, 谱有限元, 微损伤

Abstract:

Based on the analysis technology of wavelet packet energy spectrum, the problem of micro damage and its degree detection in piezoelectric intelligent plate structure is studied in this paper. Numerical simulation is used to simulate the response signal of the structure containing micro groove damage with its degree changes. The response signal is decomposed by wavelet packet analysis to get a series of subsignals and energy spectrums accordingly. The relationship between the distribution of energy spectrum and the degree of groove damage is researched. Research indicates that the wavelet packet energy spectrums can sensitively recognize the groove damage and its degree. The results can provide important guidance for real testing work.

Key words: wavelet packet energy spectrum;ultrasonic guided wave;piezoelectric wafer;spectral finite element;micro damag