基于振动特性灵敏度分析的梁结构损伤识别

Damage Identification of Beams Based on the Vibration Sensitivity Analysis

提出了一种用于梁结构损伤识别的灵敏度分析方法。该方法通过改变模型参数(固有频率和固有模态)来实现对结构损伤的识别。通过振动特性的灵敏度(包括一阶和二阶灵敏度)分析与计算,结合有限元法,就能确定梁结构损伤的位置和损伤的大小。最后给出算例验证了本文中提出的方法,并获得满意的结果。

A sensitivity analysis method for structural damage identification of beams is presented, which is developed by changing the model parameters (natural frequencies and corresponding modes). By the vibration sensitivity analysis and calculation of both natural frequencies and model vectors (including the first order and the second order), the damage in beams is located and the extent of the damage is obtained with the aid of the finite element method. An illustrative example is given to verify the method presented in this paper and satisfactory results are observed.