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基于静力位移和固有频率灵敏度矩阵,考虑这两种动静测试数据,提出了融合灵敏度结构损伤识别方法。利用位移响应和固有频率分别对全局损伤敏感效应和全部结构振动特性进行整体度量,将这两种不同类型的响应数据融合为一种灵敏度矩阵,提出了融合准则(Damage Identification Fusion Criterion,DIFC)。利用数值算例对本文所提方法进行了验证,并将识别结果与两种单工况下的灵敏度方法计算结果相比较。结果表明:融合灵敏度方法更加灵敏,特别是对于相对较小的损伤,能够较为准确地诊断损伤所在位置及损伤程度大小,误差仅为6.47%。
Based on the static displacement and the natural frequency sensitivity matrix, considering the two kinds of dynamic and static test data, a method of structural damage identification with fusion sensitivity is proposed. The global damage sensitivity effect and overall structure vibration characteristics are respectively measured by the displacement response and the natural frequency. The two different types of response data are fused into a sensitivity matrix, and the DITC criterion is proposed. Numerical examples are used to validate the proposed method, and the recognition results are compared with the results of two single-mode sensitivity methods. The results show that the fusion sensitivity method is more sensitive, especially for the lesser damage, which can accurately diagnose the location of the injury and the degree of damage, the error is only 6.47%.