Three-Steps-Meshing Based Multiple Crack Identification for Structures and Its Experimental Studies

查看全文 作　　者：LI [1]Bing;CHEN [1]Xuefeng;HE [1]Zhengjia

机构地区：[1]State Key Laboratory for Manufacturing System, Xi'an Jiaotong University

出　　处：《Chinese Journal of Mechanical Engineering》索引2013年第26卷第2期,共6页

基　　金：supported by National Natural Science Foundation of China(Grant Nos. 11176024, 51035007);National Basic Research Program of China(973 Program, Grant No. 2011CB706805);Open Research Fund Program of Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, China 摘　　要：Multiple crack identification plays an important role in vibration-based crack identification of structures. Traditional crack detection method of single crack is difficult to be used in multiple crack diagnosis. A three-step-meshing method for the multiple cracks identification in structures is presented. Firstly, the changes in natural frequency of a structure with various crack locations and depth are accurately obtained by means of wavelet finite element method, and then the damage coefficient method is used to determine the number and the region of cracks. Secondly, different regions in the cracked structure are divided into meshes with different scales, and then the small unit containing cracks in the damaged area is gradually located by iterative computation. Lastly, by finding the points of intersection of three frequency contour lines in the small unit, the crack location and depth are identified. In order to verify the effectiveness of the presented method, a multiple cracks identification experiment is carried out. The diagnostic tests on a cantilever beam under two working conditions show the accuracy of the proposed method: with a maximum error of crack location identification 2.7% and of depth identification 5.2%. The method is able to detect multiple crack of beam with less subdivision and higher precision, and can be developed as a multiple crack detection approach for complicated structures. 关键词：结构鉴定多裂纹实验裂纹识别网格裂纹检测位置识别固有频率

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Three-Steps-Meshing Based Multiple Crack Identification for Structures and Its Experimental Studies

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