| 多分辨分析在悬臂梁裂纹检测中的应用 |
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| 引用本文： | 张伟伟,王志华,马宏伟.多分辨分析在悬臂梁裂纹检测中的应用[J].太原理工大学学报,2005,36(6):666-668. |
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| 作者姓名： | 张伟伟 王志华 马宏伟 |
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| 作者单位： | 1. 太原理工大学,应用力学研究所,太原,030024
2. 太原理工大学,应用力学研究所,太原,030024;暨南大学,理工学院,广州,510632 |
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| 基金项目： | 山西省自然科学基金资助项目(20041007) |
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| 摘 要： | 介绍了小波变换及多分辨率分析方法,将小波多分辨率分析应用于悬臂梁的裂纹检测。指出振型信息包含了完整的裂纹信息,利用db2小波和sym4小波进行多分辨分析,结果表明两种小波都可以对裂纹进行准确的定位,sym4小波由于具有较高的消失矩,故在信号重构中sym4小波重构结果优于db2小波,但若只是进行裂纹定位,db2小波则明显优于sym4小波。
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| 关 键 词： | 损伤检测 裂纹 多分辨分析 在线监测 |
| 文章编号： | 1007-9432（2005）06-0666-03 |
| 收稿时间： | 2005-08-09 |
| 修稿时间： | 2005年8月9日 |
Application of Multiresolution Analysis to Crack Detection in a Cantilever Beam |
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| ZHANG Wei-wei,WANG Zhi-hua,MA Hong-wei.Application of Multiresolution Analysis to Crack Detection in a Cantilever Beam[J].Journal of Taiyuan University of Technology,2005,36(6):666-668. |
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| Authors: | ZHANG Wei-wei WANG Zhi-hua MA Hong-wei |
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| Abstract: | The multiresolution analysis is applied to the wavelet analysis of the mode shape of the cracked cantilever beam on different scales.The location of the crack is identified by the perturbation in the reconstruct coefficients of the mode shape from a 6-lever wavelet decomposition structure.The Simulation results show that the accurate crack location could be plotted according to their high-frequency part using both sym4 and db2,and it was also indicate that db2 wavelet is more suitable to locate the crack in structure though sym4 is energetic for reconstructing signal.This method can easily be applied to on-line health monitoring of the structure. |
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| Keywords: | damage detection crack wavelet analysis online diagnosis |
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