摘要
运用连续小波变换对不同缺陷简支梁的曲率模态进行分析。结果表明,根据曲率模态的小波变换系数可以确定结构的损伤位置。若损伤位置处于振型的平衡位置附近,则可以将多阶曲率模态的小波变换结果进行叠加,根据叠加以后的小波变换系数依然可以判断结构损伤的位置。进一步研究表明,结构损伤程度与小波变换系数峰值大小之间没有必然的联系,其峰值仅仅指示结构损伤的位置,需要其他指标来确定结构损伤程度与损伤指标之间的定量关系。
Continuous wavelet transform （CWT） was applied to the curvature modal analysis of simply supported beams with various defects. The results show that it is possible to determine the damage location in structures according to the wavelet transform coefficients of the curvature modals. If the damage location is near the equilibrium position of vibration, the damage location can be identified by superposition of the wavelet transform coefficients of the curvature modals. The further results show that there is essentially no relationship between the damage extent of the structure and the wavelet transform coefficient. The peaks of wavelet transform coefficients only indicate the damage location of the structures. Some other indicators are necessary for determination of the quantitative relationship between the damage indicator and the damage extent.
出处
《噪声与振动控制》
CSCD
2013年第5期131-135,共5页
Noise and Vibration Control
基金
湖南省自然科学基金资助项目(编号:12JJ3001)
关键词
振动与波
曲率模态
损伤分析
连续小波变换
桥梁
vibration and wave
curvature of mode shape
damage analysis
continuous wavelet transform
bridge
作者简介
丁科（1971-），男，湖南桃江人，工学博士，副教授，主要从事弹性波理论的研究、数据处理和实用技术的开发以及工程结构质量的无损检测技术研究。E—mail：kding@sina．com
