| 小波基带宽的变化对结构损伤识别的影响 |
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| 引用本文： | 唐和生,薛松涛,陈镕,王远功.小波基带宽的变化对结构损伤识别的影响[J].同济大学学报(自然科学版),2003,31(8):883-887. |
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| 作者姓名： | 唐和生 薛松涛 陈镕 王远功 |
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| 作者单位： | 1. 同济大学,结构工程与防灾研究所,上海,200092
2. 同济大学,结构工程与防灾研究所,上海,200092;日本近畿大学,理工学部建筑学科,日本,大阪,577-8802 |
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| 基金项目： | 国家杰出青年科学基金资助项目 (5 992 5 82 0 ) |
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| 摘 要： | 分析了小波变换在结构损伤检测中的应用 ,证实选择具有不同带宽小波基对检测结果可起到关键性作用 .小波变换可以看作是一组带通滤波器 ,小波滤波器通过多尺度带通和自相关加强特性 ,对结构的动力信号进行实时检测 .利用灵活的多尺度带通小波滤波器组 ,对结构振动信号作滤波分析 ,结构所有的自然频率特性可以同时在时频空间出现 .通过观察不同带宽内振动信号的时频变化来判断结构损伤存在
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| 关 键 词： | 结构损伤识别 小波变换 多尺度 带通滤波器 |
| 文章编号： | 0253-374X(2003)08-0883-05 |
| 修稿时间： | 2002年7月15日 |
Influence on Structural Damage Identification with Wavelet Band Changes |
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| TANG He-sheng ,XUE Song-tao ,CHEN Rong ,WANG Yuan-gong.Influence on Structural Damage Identification with Wavelet Band Changes[J].Journal of Tongji University(Natural Science),2003,31(8):883-887. |
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| Authors: | TANG He-sheng XUE Song-tao CHEN Rong WANG Yuan-gong |
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| Institution: | TANG He-sheng 1,XUE Song-tao 1,2,CHEN Rong 1,WANG Yuan-gong 1 |
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| Abstract: | This paper addresses the use of wavelet transform in structural damage detection,and has a study on the selecting of the wavelet basis plays an important role in the damage detection.The wavelet transform can be looked as a bank of band-pass filters.The wavelet filter with very multi-scale frequency-band and autocorrelation enhancement is proposed as a means of detecting the dynamic signal of structures in real-time.With the flexible multi-scale band-pass wavelet filters,any number of natural frequencies in either the time or frequency domain can be observed at the same time.In the case of abrupt damages,occurrence of damage and the moment when it occurs can be clearly determined through the observation in the details of signal changes within the variant band in time-frequency domain. |
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| Keywords: | structural damage identification wavelet transform multi-scale band-pass filter |
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