基于VMD和Chirplet变换的结构损伤识别研究  

Structural damage detection based on variational mode decomposition and the Chirplet transform

作　　者：张健[1] 程雪莉 袁平平 段明磊 任伟新 ZHANG Jian;CHENG Xueli;YUAN Pingping;DUAN Minglei;REN Weixin(School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China;School of Civil Engineering and Architecture,Jiangsu University of Science and Technology,Zhenjiang 212100,China;The First Construction Engineering Company Ltd of China Construction Second Engineering Bureau,Beijing 100176,China;College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518061,China)

机构地区：[1]江苏科技大学船舶与海洋工程学院,江苏镇江212100 [2]江苏科技大学土木工程与建筑学院,江苏镇江212100 [3]中建二局第一建筑工程有限公司,北京100176 [4]深圳大学土木与交通工程学院,广东深圳518061

出　　处：《振动与冲击》2023年第8期282-288,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金面上项目(51979130);江苏省自然科学基金面上项目(BK20191460);江苏省高等学校自然科学研究面上项目(20KJB560016);江苏省博士后科研资助计划资助项目(2021K562C)。

摘　　要：为识别结构损伤位置及对损伤程度进行量化,提出了一种基于变分模态分解(variational mode decomposition,VMD)和Chirplet变换的结构损伤识别方法。采用VMD对结构振动响应信号进行分解得到模态分量,并利用Chirplet变换对模态分量进行时频分析,构建模态分量Chirplet变换能量指标识别损伤位置,利用Chirplet时频熵量化结构损伤程度。采用一个刚度变化的简支梁数值算例对所提方法进行验证,结果表明,无论单点损伤或多点损伤,所提方法均能准确识别结构的损伤位置并量化损伤程度。In order to identify damage locations and quantify damage degree,a structural damage detection method based on variational mode decomposition(VMD)and the Chirplet transform was proposed.VMD was used to decompose structural vibration response signals to obtain modal components,and then the Chirplet transform was applied for time-frequency analysis of the modal components.The energy index of modal component Chirplet transform was constructed for damage location identification,and the Chirplet transform time-frequency entropy was defined to quantify the degree of structural damage.The proposed method was verified by a numerical example of a simply supported beam with varied stiffness.Results show that the proposed method can accurately identify the damage location and quantify the damage degree of the structure regardless of single point damage or multi-point damage.

关 键 词：变分模态分解(VMD) Chirplet变换 损伤识别 时频熵 损伤量化 

分 类 号：TN911.6[电子电信—通信与信息系统] TU311.3[电子电信—信息与通信工程]