摘要
应变模态是对结构局部特征变化比较敏感的参数,以应变模态作为响应信号,利用小波变换在时域和频域都具有的强局部化性质、易提取信号奇异部分的特点,采用连续小波进行裂缝损伤定位及定量化研究,建立了模极大值与裂缝位置、李氏指数与损伤程度之间的关系,解决了仅从应变模态数值的变化不能完全反映结构损伤程度的问题。数值模拟表明,连续小波分析的损伤识别方法不仅实现精确损伤定位,而且小波变换的李氏指数能较好的表征损伤程度,无论单处裂缝损伤还是多处裂缝损伤李氏指数均随着裂缝深度的增大而减小。
Strain mode was adopted to investigate the detection of structural crack location and damage extent by applying continuous wavelet analysis. The relationships between module maximum and crack location, Lipschitz exponent and damage extent were built, which solve the problem of incomplete reflection of damage extent by strain mode. Numerical simulations show the method of damage detection based on continuous wavelet analysis can identify rather well the damage location and its extent. With the increase of damage extent, the Lipschitz exponent decreases for single crack as well as multi-cracks.
出处
《振动与冲击》
EI
CSCD
北大核心
2008年第8期155-157,共3页
Journal of Vibration and Shock
基金
国家自然科学基金(50378007)
北京市自然科学基金(8031001)
关键词
结构裂缝识别
连续小波分析
模极大值
李氏指数
structural crack detection
continuous wavelet analysis
modulus maximum
Lipschitz exponent
