基于小波包分析的结构损伤识别研究进展

Review of structure damage identification based on wavelet packet analysis

小波包分析是对小波分析中没有细分的高频部分进行进一步分解,是一种更为精细的时频分解方法,可实现对非稳定信号的时频分析。首先阐述了结构损伤的小波分析和小波包分析的基本理论,然后主要围绕小波包能量谱损伤指标,分别对其在结构损伤的定位、微小损伤识别、在线健康监测和预警、材料缺陷检测、数值积分计算误差消除等方面的试验研究和应用情况进行了全面介绍,最后指出了结构损伤识别的小波包分析方法需要进一步研究的问题。

Wavelet packet analysis is a more accurate method of time-frequency decomposition which would decompose further high frequency signals that isn＇t decomposed by wavelet analysis,and it can analyze the time-frequency properties of unstable signals.At first this paper describe the basic theories of wavelet analysis and wavelet packet analysis,then centre on wavelet packet energy spectrum damage indices to introduce the test research and application of structural damage localization,small damage identification,on line health monitoring and alarming,material defect detection and numerical integral error elimination.Finally,some questions of wavelet packet analysis for structural damage identification are presented to research further.