Abstract：A finite element model damage identification method based on the sensitivity analysis and hybrid data was proposed.The local damage was considered as a reduction of elemental Young’s modulus of the structure.For its damage identification, the residuals between the measured data and analysis data were taken as the target equation.By introducing the sensitivity analysis and regularization technology, nonlinear equations were transformed into linear equations.Then the iteration method was used to solve the problem.The sensitivity analysis procedure is different corresponding to different types of data, such as the modal, frequency domain, and static displacement data obtained in practical engineering.If only one type of data is used, the amount of data is too small and the influence of the structural model error will be great.So, the object equation was made to contain as much measured information as possible through the fusion and weighting of the data.The numerical examples of frame and plate show that the proposed method is effective to identify local damages,good identified results can be obtained with hybrid data, and it is insensitive to the simulated measurement noise.
周俊贤，吕中荣，汪利. 基于灵敏度分析和不同数据融合的损伤识别方法[J]. 振动与冲击, 2019, 38(18): 236-241.
ZHOU Junxian， L Zhongrong， WANG Li. Damage identification based on the sensitivity analysis with hybrid data. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(18): 236-241.
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