基于两步小波变换的管道损伤识别

英文篇名：Damage identification of pipe based on two-stage wavelet transform method
中文刊名：暨南大学学报(自然科学版)
英文刊名：Journal of Jinan University(Natural Science Edition)
作者：程良彦 ; 王志华 ; 张伟伟 ; 马宏伟
英文作者：CHENG Liang-yan1 ; WANG Zhi-hua2 ; 3 ; ZHANG Wei-wei1 ; MA Hong-wei1(1.College of Science & Engineering ; The Key Laboratory of Disaster Forecast and Control in Engineering ; Ministry of Education of China ; Jinan University ; Guangzhou 510632 ; China ; 2.State Key Laboratory of Explosion Science and Technology ; Beijing Institute of Technology ; 100081 ; China ; 3.Institute of Applied Mechanics ; Taiyuan University of Technology ; Taiyuan 030024 ; China)
中文关键词：损伤检测 ; 管道模态 ; 小波变换
英文关键词：damage identification ; pipe modes ; wavelet transform
出版日期：2008-02-15
机构：暨南大学理工学院重大工程灾害与控制教育部重点实验室,北京理工大学爆炸科学与技术国家重点实验室,暨南大学理工学院重大工程灾害与控制教育部重点实验室,暨南大学理工学院重大工程灾害与控制教育部重点实验室广东广州510632,北京100081,太原理工大学应用力学研究所,山西太原030024,广东广州510632,广东广州510632
年：2008
期：01
出版单位：暨南大学学报(自然科学版)

摘要

鉴于信号提取位置的不确定性,研究了信号提取位置对损伤识别的影响.对管道进行数值模拟,提取前两阶径向和切向位移模态.对轴向节点的径向位移模态进行小波变换,小波系数的模极大值反映了损伤的轴向位置;继续对环向节点的切向模态进行小波变换,通过模极大值来识别环向损伤位置;最后讨论了轴向损伤处节点径向位移的小波系数模极大值变化规律.结果表明:两步法可以有效识别损伤位置,轴向位置不含损伤时位移模态的小波系数能显示损伤的轴向位置但小波系数有所减少.
Due to uncertainty of location acquiring signal,the effect of acquired signal location on the damage detection is investigated.The first two order radial and tangent displacement modes of pipe are acquired.The sudden change of wavelet coefficient,which is transformed by radial displacement mode of axes nodes with bior wavelet,shows the axes location of damage.The tangent displacement mode of the circular mode at the axes damage location is analyzed and transformed by the same family wavelet.The circular damage location can be determinated by using the same procedure.The results shown that the two-stage procedure enables the identification of correct damage location.When there is no damaged axes node,the wavelet coefficients of axes nodes can identify the damage location and can be decreased in number.

引文

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