基于小波分析的多层框架结构损伤识别研究

Research on Damage Identification of Multi-layer Frame Structure Based on Wavelet Analysis

为了利用小波分析时-频域局部化特性以及其对信号奇异点反应明显的特性,对2层框架结构的前八阶振型进行处理,计算其曲率,然后运用连续小波变换对曲率模态进行分析﹒通过对3种工况下的框架结构进行数值模拟分析,结果表明,曲率模态的小波变换系数模的极大值指示了结构的损伤位置,但结构损伤程度与小波变换系数模极大值大小之间没有内在的联系,其峰值的大小不能反映损伤程度,仅仅指示了结构损伤的位置。

In order to make use of the time-frequency localization characteristics of wavelet analysis and the obvious response characteristics to signal singular points,the first eight modes of the two-layer frame structure are processed and its curvature is calculated,then the curvature mode is analyzed by using the continuous wavelet transform.Through the numerical simulation analysis of the frame structure under three working conditions,the research shows that the wavelet transform system of the curvature mode is the maximum value of digital modulus indicates the damage position of the structure,but there is no internal relationship between the damage degree of the structure and the maximum value of the modulus of the wavelet transform coefficient.The value of its peak value can not reflect the damage degree,only indicates the damage position of the structure.