结构故障诊断中的小波分解层数选取方法研究  

A method for choosing the wavelet decomposition level in structural fault analysis

作　　者：王婉秋[1] 杨松[1] 

机构地区：[1]北京卫星环境工程研究所,北京100094

出　　处：《强度与环境》2009年第4期34-41,共8页Structure & Environment Engineering

基　　金：民用863计划项目资助:相容概率/非概率信息的卫星产品可靠性度量指标及方法研究(2006AA04Z410)

摘　　要：小波变换被广泛的应用到结构故障诊断中,但尽管利用小波变换进行故障诊断效果很好,在实际操作过程中仍存在两个问题,即小波基函数的选择和最佳小波分解层数的选择。基于结构的动力系统,通过讨论结构动力响应、频率折叠及频率混淆对小波分解层数的影响,推导总结出一种小波分解层数的算法,并给出了其算法公式。Wavelet is widely used in structure fault analysis for its special characteristic. There are two problems in operating process, although the wavelet makes good effect in structure fault analysis. The problems are the choice of wavelet base and the choice of decomposition level. The wavelet decomposition level is very important to the analysis and will influence the result. Based on structural dynamic system, considering the affect that imposed by structural dynamic response, frequency collapse, frequency confusion A kind of arithmetic of wavelet decomposition was summarized, also the formula was given.

关 键 词：小波变换 分解层数 结构响应 

分 类 号：V475.1[航空宇航科学与技术—飞行器设计]