基于模态应变能相关性的结构损伤定位研究

摘要

本文基于灰色相关性理论,通过分析结构发生损伤时单元模态应变能与未损伤时单元模态应变能的相关性对结构损伤进行定位,提出了模态应变能置信因子,根据该因子的变化曲线即可实现结构损伤的准确定位. 将该方法用于两端固支梁的单损伤及多损伤的损伤定位中,识别结果可以验证:无论是单损伤还是多损伤、损伤是连续或是不连续、损伤程度是否相同,该方法对结构中的损伤都能实现准确定位,后续研究将此方法应用于大型复杂结构的损伤识别中.%Based on the the grey relation theory, a new structural damage location method using modal strain energy is first proposed in this paper. Modal strain energy assurance coefficient is defined and used to locate damage in the structure. A numerical example of a two-fixxed beam with single or multiple damages is used to examine the capability of the proposed method to localize damages. The nu-merical results showed that the damage in the structure can be localized correctly through modal strain energy assurance coefficient, this proposed method only requires dynamic test data, which is easily available in practice, and has wide applications in structural damage location.