基于模型缩聚-频响函数型模型修正的子结构损伤识别方法

由于大型复杂结构参数识别困难,提出将频响函数型模型修正方法与子结构方法结合进行损伤识别。构造一个关于损伤频响函数的优化方程。通过子结构有限元模型向损伤后频响函数修正的过程,识别损伤参数。以一个三层平面刚架为数值算例,计算结果表明该算法对损伤参数较为敏感,识别精度较高,可以准确识别出预设的子结构损伤单元和损伤程度。

Substructure damage identification method based on model condensation-model updating of frequency response function

Due to the difficulty in identifying parameters of the large and complex structure, a damage identification method combining model updating based on the frequency response function (FRF) method with the substructure method was proposed. An optimization equation about the FRF after damage was constructed. Then, the damage parameters were identified by updating the substructure finite element model (FEM) to FRF after damage. A three-layer plane frame was used as a numerical example. The calculation results show that the algorithm is more sensitive to damage parameters and has higher recognition accuracy. The method can accurately identify the predefined substructure damage elements and degree.