基于转角模态曲率的损伤识别研究  

Research on the Damage Identification Based on Rotational Mode Shape Curvature

作　　者：王成强[1] 陈怀海[1] 姜双燕[1] 樊向党[2] 

机构地区：[1]南京航空航天大学航空宇航学院,南京210016 [2]海军航空工程学院青岛分院,山东青岛266041

出　　处：《海军航空工程学院学报》2009年第3期251-254,共4页Journal of Naval Aeronautical and Astronautical University

摘　　要：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。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 used method by translation modes.

关 键 词：损伤识别 振型 曲率 振动 有限单元法 

分 类 号：V214.33[航空宇航科学与技术—航空宇航推进理论与工程]