基于转角模态曲率的损伤识别研究

利用测量得到的模态参数，应用中心差分法求取振型曲率，用损伤前后同一位置的振型曲率变化作为结构损伤的识别指标。采用有限元方法，通过数值仿真，对不同位置发生损伤前后的悬臂梁进行仿真计算，得到其模态参数。利用构造的损伤识别指标对结构损伤情况进行识别研究。在前人研究的基础上，特别提出了利用角位移模态曲率变化来识别损伤位置。仿真算例表明：利用角位移模态曲率比平动位移模态曲率识别损伤的效果更好，精度更高。

Research on the Damage Identification Based on Rotational Mode Shape Curvature

The mode shape curvatures were obtained by the central difference method after the mode data was measured in frequency domain.The modal parameters were calculated of a cantilever beam before or after damages occur at different positions by FEM numerical simulation.The given evaluation index was used to identify the damage in the beam.A detection method using the curvature of rotational mode displacement was set forth.The simulating results showed that the damage identification accuracy was better than the u...