摘要
经验模态分解(EMD)过程中存在着端点效应问题,使得EMD分解结果产生严重的失真现象,从而导致处理数据发生畸变。提出了将极值点对称延拓和在信号序列上加窗函数相结合的方法,带入到EMD分解过程中,以抑制信号被分解时在端点附近所产生的上下包络线的发散现象。结果表明,该方法较好地解决了信号失真问题。
Empirical mode decomposition （EMD） is a method to process the nonlinear or nonsmooth data. But there is an involved end effect with it. The emergence of the effect makes the results of EMD decomposition have a serious distortion. In order to restrain the end effects of empirical mode decomposition, a method with combination of symmetrical extrema extension and window function multiplying in signal was proposed in this paper. This method was applied to harmonic analysis, and the simulation results show the effective ness of this method to restrain the end effects of Empirical Mode Decomposition.
出处
《太原理工大学学报》
CAS
北大核心
2009年第6期579-581,共3页
Journal of Taiyuan University of Technology
基金
山西省自然科学基金资助项目(20050147)
关键词
经验模态分解(EMD)
端点效应
极值点对称延拓
窗函数
empirical mode decomposition （EMD）
end effect
symmetrical extrema extension
window function.
作者简介
李敏（1972-），男，博士生，主要从事机电设备故障故障诊断及信号分析等方面的研究工作，（Tel）13935168360
通讯联系人：程珩，教授级高工，（Tel）0351-6014956
