| 带表面裂纹连续梁损伤识别的曲率模态小波分析 |
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| 引用本文： | 管德清,潘伟.带表面裂纹连续梁损伤识别的曲率模态小波分析[J].长沙交通学院学报,2009,25(3). |
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| 作者姓名： | 管德清 潘伟 |
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| 作者单位： | 1. 长沙理工大学,土木与建筑学院,湖南,长沙,410004
2. 山东英才学院,建筑工程学院,山东,济南,250104 |
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| 基金项目： | 国家自然科学基金资助项目，湖南省优秀博士论文基金 |
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| 摘 要： | 以带横向非对称非贯通表面裂纹的连续梁为研究对象,利用小波奇异性检测原理,提出了带表面裂纹连续梁损伤识别小波分析方法.以带表面裂纹连续梁三维有限元分析求解梁的位移模态为基础,利用中心差分法得到梁的曲率模态,再用sym4小波对曲率模态进行连续小波变换,根据小波系数模极大值识别损伤位置,以一个三跨连续梁内两处半椭圆形表面裂纹的损伤识别为例,通过数值计算分析,验证了方法的有效性.同时,计算结果表明,运用曲率模态小波变换识别连续梁损伤比基本振型的小波变换方法更为准确、有效.该研究对带表面裂纹结构的损伤诊断应用具有参考价值.
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| 关 键 词： | 表面裂纹 损伤识别 曲率模态 连续小波变换 |
Surface crack identification of continuous beam using wavelet analysis of curvature mode |
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| GUAN De-qing,PAN Wei.Surface crack identification of continuous beam using wavelet analysis of curvature mode[J].Journal of Changsha Communications University,2009,25(3). |
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| Authors: | GUAN De-qing PAN Wei |
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| Institution: | GUAN De-qing,PAN Wei(1.College of Civil Engeering , Architecture,Changsha University of Science & Technology,Changsha 410004,China,2.School of Engineering,Sh,ong Yingcai College,Jinan 250104,China) |
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| Abstract: | A method for surface crack identification in continuous beam is proposed.It is based on wavelet singularity detection and focused on transverse unsymmetrical and nonpenetrative surface crack.Solving curvature modal parameters of continuous beam with cracks by means of the three-dimensional finite element theory,using the central difference method to obtain the curvature mode of continuous beam,and applying the sym4 continuous wavelet transform(CWT) to analyse the curvature mode,then the crack location of th... |
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| Keywords: | surface crack damage detection curvature mode continuous wavelet transform |
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