基于损伤存在概率成像方法的复合材料结构损伤识别

严 宏;周 丽

振动与冲击 ›› 2012, Vol. 31 ›› Issue (13) : 76-80.

PDF(1995 KB)
PDF(1995 KB)
振动与冲击 ›› 2012, Vol. 31 ›› Issue (13) : 76-80.
论文

基于损伤存在概率成像方法的复合材料结构损伤识别

  • 严 宏,周 丽
作者信息 +

Damage Identification of Composite Structures Based on Reconstruction Algorithm for Probabilistic Inspection of Damage

  • YAN Hong, ZHOU Li
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摘要


摘 要:基于小波分析理论和概率统计原理,提出一种损伤存在概率成像方法,对复合材料结构进行在线的健康监测。首先对结构损伤前后Lamb信号进行比较,提取信号的能量特征差异系数,作为损伤指标;然后用概率统计方法判断该损伤指标是由损伤引起的还是因环境变化造成的;最后用成像算法给出存在概率图像识别损伤。对复合材料板结构进行实验验证该方法的可行性,具有一定的实际工程应用价值。



Abstract

Abstract: In this paper, the reconstruction algorithm for probabilistic inspection of damage (RAPID) is proposed for continuous on-line monitoring of composites based on wavelet analysis and the theory of probability and statistics. First, the wavelet analysis is applied to extract the features of the Lamb wave signals of the reference and present states on each sensing path. The difference coefficient between the features is called as a damage index (DI). Then, the probabilistic method is used to judge that the DI is caused by either the structural damage or the environmental factors. Finally, a tomogram generated by the RAPID algorithm is obtained to identify the damage. An experimental study on a composite panel with a 12-PZT sensor network is conducted and presented to verify the capability of the RAPID algorithm for damage identification. Experimental results demonstrate that the proposed method is quite feasible and effective for composite structural damage identification. And also, it has certain application value for the practical engineering.

关键词

损伤指标 / 小波分析 / 损伤存在概率成像方法 / Lamb波 / 损伤识别

Key words

damage index / wavelet analysis / RAPID / Lamb wave / damage identification

引用本文

导出引用
严 宏;周 丽. 基于损伤存在概率成像方法的复合材料结构损伤识别[J]. 振动与冲击, 2012, 31(13): 76-80
YAN Hong;ZHOU Li. Damage Identification of Composite Structures Based on Reconstruction Algorithm for Probabilistic Inspection of Damage [J]. Journal of Vibration and Shock, 2012, 31(13): 76-80

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