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Structural damage identification by a cross modal energy sensitivity based mode subset selection strategy
Marine Structures ( IF 3.9 ) Pub Date : 2021-02-24 , DOI: 10.1016/j.marstruc.2021.102968
Mingqiang Xu , Shuqing Wang , Yufeng Jiang

This paper presents a strategy specialized for modal energy (ME) based methods, including modal strain energy (MSE) and modal kinetic energy (MKE), to select the best mode subset prior to damage identification. The damages due to the changes in stiffness and mass of structural members are both considered. In order to apply the proposed scheme to a more general situation, the cross modal energy (CME) sensitivity instead of the usual ME sensitivity is derived and designated as a sensitivity index. According to this index, the mode combinations (MCs) that are more sensitive to stiffness and mass changes are retained, while the remaining MCs that complicate the process of damage detection are eliminated. One of the important applications of the proposed mode subset selection strategy (MSSS) is to optimize the Cross-model cross-mode (CMCM) system by eliminating some redundant equations, thereby improving the performance of the CMCM method and reducing the computational burden. Numerical and experimental studies are carried out to prove the effectiveness of the proposed scheme. The results show that the performance of the CMCM method has been significantly improved after adopting the MSSS.



中文翻译:

基于交叉模态能量敏感性的模式子集选择策略识别结构损伤

本文提出了一种专门针对基于模态能量(ME)的方法的策略,包括模态应变能(MSE)和模态动能(MKE),以便在损伤识别之前选择最佳模式子集。都考虑了由于结构构件的刚度和质量变化而引起的损坏。为了将所提出的方案应用于更一般的情况,推导了交叉模态能量(CME)灵敏度而不是通常的ME灵敏度,并将其指定为灵敏度指标。根据该指标,保留了对刚度和质量变化更敏感的模式组合(MC),而消除了使损伤检测过程复杂化的其余MC。所提出的模式子集选择策略(MSSS)的重要应用之一是通过消除一些冗余方程来优化交叉模型交叉模式(CMCM)系统,从而提高CMCM方法的性能并减少计算负担。数值和实验研究证明了该方案的有效性。结果表明,采用MSSS后,CMCM方法的性能得到了显着改善。

更新日期:2021-02-24
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