Empirical Mode Decomposition Envelope Technique and Mode Mixing Problem in Amplitude Modulation-frequency Modulation Signals

被引：1
|
作者：
He L. [1 ]
Lin J. [1 ]
Ding J. [1 ]
Liu X. [1 ]
机构：
[1] State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu
来源：
Lin, Jianhui (lin13008104673@126.com) | 2017年 / Chinese Mechanical Engineering Society卷 / 53期
关键词：
Empirical mode decomposition; Envelope algorithm; Instantaneous frequency estimation; Mode mixing;
D O I：
10.3901/JME.2017.02.001
中图分类号：
学科分类号：
摘要：
Empirical mode decomposition (EMD) is a self-adaptive method and suitable to analysing the non-stationary and nonlinear signals. The envelope technique and mode-mixing problem are the most important topics of the EMD. A nonlinear and nonstationary signal is modeled as a multicomponent amplitude modulation-frequency modulation (AM-FM) signal and each intrinsic mode function (IMF) of the EMD will be modeled as a single AM-FM signal. Through studying the envelope technique of single AM-FM signal and the mode-mixing problem caused by separating multicomponent AM-FM signals with the EMD algorithm, a new necessary condition of envelope and the numerical calculation method of the new conditional envelope algorithm are presented. Based on the new conditional envelope algorithm, a new estimation algorithm for phase and instantaneous frequency of single component AM-FM signal is proposed. A solution is presented to the mode-mixing problem that occurs when multicomponent AM-FM signals are separated. The efficacy of the proposed method is verified by several simulation signals and a measured data of rubbing fault of rotor system. © 2017 Journal of Mechanical Engineering.
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页码：1 / 10
页数：9
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