The stator current is firstly decomposed with EMD, then the IMF (intrinsic mode function) component which contains the broken bar fault feature is spectrum analyzed by using ZOOM-FFT.
即先对定子电流信号进行EMD分解,提取反映故障信息的IMF(内禀模态函数)分量,再对该IMF分量进行ZOOM-FFT,以取得较好的频谱分析结果。
参考来源 - 基于EMD与ZOOMThe basic concepts of instantaneous frequency and intrinsic mode function are illustrated. Then,the algorithm principle and the meanings in physics of Hilbert time-frequency spectrum and marginal spectrum are described.
其次,介绍了Hilbert-Huang变换方法的提出背景和相关理论,阐述了信号的瞬时频率和本征模函数的基本概念,说明了算法实现原理和Hilbert谱及边际谱的物理意义。
参考来源 - 微波近场医学特征回波中瞬时谱提取与分析·2,447,543篇论文数据，部分数据来源于NoteExpress
Each of smooth layers is called as intrinsic mode function, which represents the signal characteristics of different scales.
其中每一个平稳数据层被称为一个本征模式函数，它们代表了信号不同尺度的特性。
The EMD method and its adaptive filtering property in the process of obtaining the intrinsic mode function(IMF) were discussed.
讨论了经验模态分解方法及其在获取固有模态函数过程中的自适应滤波特性。
First we employ EMD method to decompose the crude oil prices in NYMEX, and obtain a series of intrinsic mode function (IMF), which are stationary and of strong periodicity, and a trend term.
首先利用EMD方法对NYMEX市场的原油期货价格进行分解，得到一系列平稳且具有较强周期性的本征模函数(IMF)和一个趋势项。
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