摘要
将小波变换直接用于含裂纹悬臂梁的不同模态,利用小波系数在空间域上的突变指示裂纹位置,通过定义集中因子标定裂纹深度。并分析和讨论了悬臂梁前四阶模态对损伤的敏感性。通过本文的实验研究,检验了sym4小波在工程应用中的适用性,并指出二阶模态是较为敏感的损伤信息,有助于提高缺陷识别的精度和可靠性。
The wavelet transform is applied to the spatial-frequency analysis of the different modes of the cracked cantilever beam. The position of the crack is located by the sudden change in the spatial variation of the transformed response. The sensitivity of the first four mode shapes to crack location and depth are discussed. Furthermore, the defined intensity factor, which derives from a relation between behavior of the wavelet maxima for different scales and the Lipschitz exponent, can be used to estimate the size of the crack. The experimental results illustrate that the second mode is competitive candidate for crack parameter identification using the wavelet transform. This technique can easily be applied to on-line health monitoring of the structure.
出处
《机电产品开发与创新》
2006年第4期22-24,共3页
Development & Innovation of Machinery & Electrical Products
关键词
悬臂梁
小波理论
奇异性
损伤检测
裂纹
cantilever beam
wavelet analysis
singularity
damage detection
crack
