改进的Hilbert-Huang变换在信号瞬态特征提取中的应用  

APPLICATION OF IMPROVED HILBERT-HUANG TRANSFORM IN TRANSIENT FEATURE EXTRACTION

作　　者：秦毅[1] 秦树人[1] 毛永芳[1] 

机构地区：[1]重庆大学测试中心,重庆400030

出　　处：《振动与冲击》2008年第11期129-133,181,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(50575233);863高技术计划(2005AA420350)

摘　　要：通过对Hilbert-Huang变换(Hilbert Huang Transform,HHT)方法的机理的研究,提出了一种提取非平稳信号中瞬态特征的新方法,即正交经验模态分解(Orthogonal Empirical Mode Decomposition,OEMD)与Hilbert变换结合法。OEMD是一种以快速带通滤波为基础的,获得同有模态函数(IMF)的新方法,其最大特点是具有严格的正交性。通过OEMD得到IMFs后,再进行Hilbert变换求得瞬时频率和幅值,便能精确检测出信号中瞬态成分的时间、频率和幅值等信息。仿真和应用结果表明,该法比原HHT方法能更加有效地提取信号的瞬态特征,并成功地解决了原HHT中存在的模态混叠、虚假模态和边界效应等问题。A method of extracting transient features of non-stationary signal was proposed based on the combination of orthogonal empirical mode decomposition (OEMD) and Hilbert transform.Obtaining the intrinsic mode functions (IMFs) by use of OEMD,the instantaneous frequency and amplitude can be calculated by the Hilbert transform,so that the time,frequency and amplitude of transient component in the signal can be detected accurately.Simulations and appli- cations show that by the method the transient features of signal can be extracted more effectively than by original Hilbert- Huang transform(HHT),and such problems existing in original HHT method as mode aliasing,fault mode and end effect can be solved.

关 键 词：正交经验模态分解 HILBERT变换 滤波 瞬态特征 冲击信号 

分 类 号：TH165.3[机械工程—机械制造及自动化]