CAJ | 학술논문

提出了一种基于响应灵敏度分析的有限元模型修正法，对平板结构的局部损伤进行识别。在正问题研究中，将结构的局部损伤模拟为板结构单元杨氏模量的减少，建立了板结构的有限元动力学方程，利用直接积分法获得了结构强迫振动响应。在损伤识别反问题中，基于响应灵敏度分析，直接利用结构的动态响应进行有限元模型修正和损伤识别。算例表明，本文方法能有效识别板类结构的局部损伤，具有需要测点数目少，损伤识别精度高，对模拟的测量噪声不大敏感的优点。
제출료일충기우향응령민도분석적유한원모형수정법，대평판결구적국부손상진행식별。재정문제연구중，장결구적국부손상모의위판결구단원양씨모량적감소，건립료판결구적유한원동역학방정，이용직접적분법획득료결구강박진동향응。재손상식별반문제중，기우향응령민도분석，직접이용결구적동태향응진행유한원모형수정화손상식별。산례표명，본문방법능유효식별판류결구적국부손상，구유수요측점수목소，손상식별정도고，대모의적측량조성불대민감적우점。
A response sensitivity-based approach was presented to identify local damages in an isotropic plate structure using the finite element model updating.The local damage was considered as a reduction of elemental Young's modulus of the plate,the FE dynamic equations of the plate were built.The forced vibration responses of the plate under external excitations were obtained with Newmark direct integration.For its damage identification,a response sensitivity-based finite element model updating approach was used to identify local damages of the plate in time domain.Numerical examples showed that the proposed method is effective to identify local damages of plates;good identified results can be obtained with short time histories of a few measurement points,and it is insensitive to the simulated measurement noise.