基于功率谱灵敏度分析的结构损伤识别方法

Structural damage identification based on sensitivity analysis of power spectral density

在分析结构响应功率谱密度对结构单元刚度灵敏度基础上,提出平稳随机激励作用下结构损伤识别新方法。利用随机振动虚拟激励法,获得平稳随机激励下结构响应功率谱密度函数对结构损伤参数的灵敏度,用有限元模型修正实现结构损伤识别。经对剪切结构损伤识别数值结果表明,该方法仅用有限个传感器频域数据,即能较好识别结构损伤。

Based on the analysis of the sensitivity of structural response power spectral density with respect to the structural stiffness parameter,a new method was proposed to identify structural damages under stationary random excitations. Under stationary random excitations,the sensitivity was analysed using the pseudo excitation method. Then the finite element model updating method was applied to identify structural damages. The numerical example of a shear structure demonstrates the accuracy and efficiency of the proposed method,where only the frequency response data of finite accelerometers are needed.