基于模态应变能和小波变换的结构损伤识别研究

严 平;李胡生;葛继平;叶黔元

振动与冲击 ›› 2012, Vol. 31 ›› Issue (1) : 121-126.

PDF(2001 KB)
PDF(2001 KB)
振动与冲击 ›› 2012, Vol. 31 ›› Issue (1) : 121-126.
论文

基于模态应变能和小波变换的结构损伤识别研究

  • 严 平1,2; 李胡生2; 葛继平2; 叶黔元1
作者信息 +

Structural damage identification based on anslysis of modal strain energy and wavelet transformation

  • YAN Ping1,2; LI Hu-sheng2; GE Ji-ping2; YE Qian-yuan1
Author information +
文章历史 +

摘要

针对单一方法对结构同时发生多处不同程度损伤识别的不敏感性缺陷,本文结合小波变换在时域、频域内表征信号局部特性且能够聚焦到信号或函数的任意细节进行处理的能力,提出了一种基于单元模态应变能和小波变换的结构损伤识别方法。在单元模态应变能基础上,利用小波变换系数的变化和分布情况构建单元模态应变能小波变换结构损伤指标,通过对简支梁的数值模拟和斜拉桥模型试验研究的结果与单元模态应变能平均变化率作为损伤识别指标的计算结果进行对比,结果表明该方法能有效确定结构同时发生多处不同程度损伤的位置和估计损伤程度,为实际工程应用奠定了基础。

Abstract

Single method for structural multiple different degree damage identification is not sensitive to small defects. The paper presents an approach of structural damage identification based on modal strain energy and wavelet transformation characteristics to denote local signal in time domain or frequency domain and process any details of the signal or function. The structural damage index is given out with the change and distribution of wavelet transform coefficients based on elemental modal strain energy. Through the numerical simulation of a simply supported beam and a cable-stayed bridge model experiment study, the method compared with elemental modal strain energy method can effectively determine the structure multiple different degree damage location and estimate damage degree. The method research laid the foundation for the practical application of engineering

关键词

结构损伤识别 / 独塔斜拉桥 / 模态应变能 / 小波变换 / 试验研究

Key words

structural damage identification / cable-stayed bridge / modal strain energy / wavelet transformation / experimental study

引用本文

导出引用
严 平;李胡生;葛继平;叶黔元. 基于模态应变能和小波变换的结构损伤识别研究[J]. 振动与冲击, 2012, 31(1): 121-126
YAN Ping;LI Hu-sheng;GE Ji-ping;YE Qian-yuan. Structural damage identification based on anslysis of modal strain energy and wavelet transformation[J]. Journal of Vibration and Shock, 2012, 31(1): 121-126

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