摘要
应变模态对结构局部特征变化比较敏感,以此为响应信号采用Coiflet连续小波变换进行简支梁结构裂缝损伤定位及损伤程度标定.通过小波变换的模极大值确定损伤位置,建立单处、多处损伤时小波变换的李氏指数与损伤程度之间关系;同时研究了多处裂缝损伤对李氏指数的影响.数值模拟表明,连续小波分析的损伤识别方法不仅能精确定位损伤,还可以标定损伤程度,无论单处多处损伤李氏指数均随着损伤程度增大而减小.
Strain mode is sensitivity to structure local characteristics change.It is adopt as response signal to Coiflet continuous wavelet transform to crack location and extent detection for simple beam structure.Damage location is identified by modulus maximum of continuous wavelet transform.The relationship between Lipschitz exponent and damage extent is built and the influence of multi-cracks detection is also studied.Numerical simulation show the method of damage detection based continuous wavelet transform can...
出处
《北京工业大学学报》
EI
CAS
CSCD
北大核心
2009年第11期1473-1477,共5页
Journal of Beijing University of Technology
基金
国家自然科学基金(50808005)
国家科技支撑计划项目(2006BAJ27B04)
北京市科技计划课题(Y060506000007022)
关键词
简支梁结构
连续小波变换
模态参数识别
模极大值
李氏指数
simple beam structure
continuous wavelet transform
mode parameter detection
modulus maximum
Lipschitz exponent
