基于振型差与小波变换的结构损伤识别方法  

The Method of Damage Identification Based on Difference Between Mode Shape and Wavelet Transform

作　　者：徐典[1] 周兆银[1] 李强[2] 

机构地区：[1]重庆科技学院建筑工程学院,重庆401331 [2]重庆机电职业技术学院,重庆400036

出　　处：《工程建设与设计》2018年第1期32-34,38,共4页Construction & Design for Engineering

基　　金：重庆科技学院建筑工程学院项目(JG201704)

摘　　要：对基于小波变换的结构损伤识别方法进行了研究,推导了小波变换理论,提出了基于一阶振型差与小波变换相结合的损伤识别方法。以结构损伤前后的一阶振型差作为原始信号,进行小波变换,通过小波变换系数的峰值来判断损伤位置。通过简支梁算例设定3种工况验证了这一方法的有效性,结果表明:采用该方法能够准确的识别出文中梁结构发生损伤的位置,新方法较仅采用损伤后结构的振型作为原始信号更加有效。The method of structural damage identification based on wavelet transform has been studied in this paper. Wavelet transform theory is deduced and method of damage identification based on difference of first mode shape and wavelet transform are proposed. This method is that taking difference of first mode shape of damaged and undamaged structure as original input signal for wavelet transform then locating damage with peak of wavelet transform coefficient. Then a simple beam example under three kinds of damage conditions is taken to verify the effectiveness of this method. The results show that with this method we can detect the location of damage accurately in the beam mentioned in the paper. Identification effect with this method is better than the results of only using first mode shape of damaged structure as input signal.

关 键 词：结构损伤 损伤识别 简支梁 小波变换 一阶振型差 

分 类 号：TU31[建筑科学—结构工程]