【摘要】 通过对结构损伤前后模态特征的变化进行分析,利用损伤结构的位移振型函数构造出曲率振型函数γi(x),然后再在曲率振型函数的基础上提出一个用于探测和评定损伤程度的新指标———损伤因子r(x)=∑i∈Idγi2(x);基于小波分析的方法,对损伤因子进行周期小波变换,通过小波系数的取值范围提出了一种结构损伤定位和损伤程度的评估方法.数值仿真表明,这是一种行之有效的损伤识别方法.更多还原

【Abstract】 After analyzing the change of modal character before and after the structure damage and computing the curvature mode shape γ_i(x) by displacement shape,a new index,damage factor r(x)=∑i∈I_dγ~2_i(x) which can be used in locating and estimating damage,is presented;Based on periodic wavelet analysis,the damage factor is transformed into wavelet coefficients, and an estimation of damage location and damage extent is presented by ranging the wavelet coefficients.The numerical simulation results verify the effectiveness of the method.更多还原