曲率模态和小波包变换在结构损伤识别中的应用  

A METHOD FOR STRUCTURE DAMAGE DETECTION BASED ON CURVATURE MODE AND WAVELET PACKET TRANSFORMATION

作　　者：王振林[1] 聂国华[1] 

机构地区：[1]同济大学航空航天与力学学院,上海200092

出　　处：《振动与冲击》2008年第1期124-126,共3页Journal of Vibration and Shock

基　　金：国家自然科学基金(批准号:40674062);教育部"新世纪优秀人才支持计划"(批准号:NCET-04-0373)资助项目

摘　　要：小波包变换相比传统的Fourier变换,对非平稳信号分析具有良好的特性。利用小波包变换的特性,根据曲率模态损伤检测原理提出了一种基于小波包组分能量变化率作为损伤指标的分析方法。通过一简支梁结构的数值模拟,表明该方法对于判定损伤存在和确定损伤位置是有效的。Wavelet packet transformatiom(WPT) is proven to be more effective than traditional Fourier transform-ation(FT) in non-stationary signal processing.A method of structure damage detection is developed using wavelet packet component energy rate as a damage index based on the principle of wavelet packet component energy and curvature mode for the purpose of damage detection.The numerical simulation of a simply-supported beam is performed using the proposed method.The results show that the method is effective to determine if the damage exists and its location.

关 键 词：小波包变换 损伤识别 曲率模态 

分 类 号：O342[理学—固体力学]