基于模态应变能曲率差的结构损伤识别方法  

A new damage identification method based on modal strain energy curvature difference

作　　者：马立元[1] 郭俊龙[1] 李永军[1] 王天辉[1] 

机构地区：[1]军械工程学院导弹工程系,石家庄050003

出　　处：《海军工程大学学报》2015年第6期83-86,共4页Journal of Naval University of Engineering

摘　　要：针对大型结构局部损伤识别指标灵敏度不高的问题,提出了基于模态应变能曲率差的结构损伤识别方法。利用局部结构的振型和质量矩阵以及固有频率,求出单元模态应变能曲率差,并将该指标应用于损伤识别中。数值算例表明:该指标可以有效地定位损伤,并能定性描述损伤程度,且具有一定的抗噪性能。最后,将该方法应用于某发射台模型损伤识别的试验研究中,实测数据分析验证了该方法的有效性。To deal with the low sensitivity in local damage identification of large complex structure, a new indicator called modal strain energy curvature difference （MSECD） is put forward to evaluate structural damage. The modal strain energy curvature is obtained by using the model-shape, mass ma- trix and inherent frequency of the local structure. Then the indicator is used in damage identification. Numerical analysis shows that the indicator can not only locate damage effectively, but also determine the initial degree of injury. The method also has certain ability against noise. Finally the method is used in damage identification of a launch platform model. The result shows that the method is effec- tive and it is suitable for local damage identification of large complex structure.

关 键 词：模态应变能曲率差 局部损伤 损伤识别 损伤定位 

分 类 号：TU311[建筑科学—结构工程]