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推导了单元模态应变能变化率的表达公式,通过对不同类型状况的模拟,得到了其单元模态应变能变化率。结果显示,无论对单一损伤还是多重损伤,单元模态应变能变化率都能准确地识别其位置。单元模态应变能变化率指标还可以在一定程度上反映损伤的程度。因此,该指标作为旋翼大梁损伤识别的参数是可行有效的。
The expression of the rate of change of unit modal strain energy is deduced. Through the simulation of different types of conditions, the rate of change of unit modal strain energy is obtained. The results show that the unit modal strain energy change rate can accurately identify the position of single unit damage or multiple damage. Unit modal strain energy change rate indicator can also reflect the degree of damage to some extent. Therefore, it is feasible and valid to use this index as a parameter of damage identification of rotor girder.