摘要
HIBERT-HUANG变换(HHT)实现过程中,对信号进行经验模态分解(Empirical mode decomposition,EMD)和对分解得到的各个本征模函数(Intrinsic mode function,IMF)进行HILBERT变换时都会产生端点效应。对此问题,采用波形特征匹配延拓数据,提高经验模态分解精度,有效地抑制HILBERT变换中的端点效应,获得准确的HILBERT时频谱。所延拓数据兼顾原始信号中的极值点及非极值点的波形数据,使延拓数据特征与原信号一致,在HHT变换实现过程中仪需一次延拓,算法简单。仿真计算和转子系统故障试验分析结果表明,所用方法可以有效解决HHT变换的端点效应问题。
The HILBERT-HUANG transform consists of ansform. The end effects produce both in the decomposition two steps: empirical mode decomposition (EMD) and HILBERT trprocess of EMD and HILBERT transforms applied to the intrinsic mode functions (IMFs). A novel wave characteristic matching extending method is proposed to overcome the end effects of EMD and HILBERT transform. Therefore, the decomposition precision is improved, the accurate instantaneous frequencies and instantaneous amplitudes could be obtained. The extending data derived from the original signal by the simple algorithm, only once extending needed in HILBERT-HUANG transform processing. The simulation and fault test analysis demonstrate the effectiveness of the method.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2008年第4期154-158,共5页
Journal of Mechanical Engineering
基金
国家自然科学基金(50677017)
作者简介
胡爱军,男,1971年出生,博士研究生,副教授。主要从事信号分析、机械故障诊断技术研究。E-mail:bdlaohu@126.com