定位结构损伤的改进跨模型模态应变能法  

IMPROVED CROSS⁃MODEL MODAL STRAIN ENERGY METHOD FOR STRUCTURAL DAMAGE LOCALIZATION

作　　者：张雅儒 马俊[1,2] 伍晓顺 ZHANG YaRu;MA Jun;WU XiaoShun(School of Civil Engineering and Surveying and Mapping Engineering(Nanchang),Jiangxi University of Science and Technology,Nanchang 330013,China;Nanchang Key Laboratory of Virtual Digital Engineering and Cultural Communications,Nanchang 330013,China)

机构地区：[1]江西理工大学土木与测绘工程学院(南昌),南昌330013 [2]南昌市虚拟数字工程与文化传播重点实验室,南昌330013

出　　处：《机械强度》2024年第2期503-508,共6页Journal of Mechanical Strength

基　　金：江西省自然科学基金资助项目(20202BAB204028);国家自然科学基金项目(51868026)资助。

摘　　要：为了提高结构损伤定位的精度,提出将跨模型模态应变能与小波分析(Wavelet Analysis, WA)相结合的结构损伤定位方法。首先,计算所有单元的跨模型模态应变能指标。其次,对由各单元跨模型模态应变能指标构成的序列进行小波分析,提取高频细节系数后对其进行重构,以得到改进的损伤指标。最后,根据改进指标判断损伤位置。以某平面桁架为例并考虑5%噪声水平进行蒙特卡洛分析。结果表明,改进指标抵抗噪声干扰的鲁棒性更强,能更好地指示损伤位置。In order to improve the accuracy of structural damage localization,a method to locate structural damages is proposed by combining the cross⁃model modal strain energy and the wavelet analysis(WA).Firstly,indices based on cross⁃model modal strain energy of all elements have been calculated.Secondly,the wavelet analysis is conducted on the sequence composed of the calculated indices of all elements,with high⁃frequency detail coefficients extracted to form the improved damage index.Finally,damage locations are judged according to the improved index.A planar truss is taken as the numerical example,with the Monte Carlo analysis carried out in consideration of 5%noise level.The result shows that the improved index is more robust to resist noise interference and can better indicate damage locations.

关 键 词：损伤定位 模态应变能 小波分析 结构健康监测 模态识别 

分 类 号：TU311[建筑科学—结构工程] O327[理学—一般力学与力学基础] O329[理学—力学]