基于MM-EMD的改进HHT及其应用

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (20) : 23-26.

论文

基于MM-EMD的改进HHT及其应用

梁升1 王新晴1 王东1 夏天2 钱淑华1

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Improved HHT by MM-EMD and its Application

Liang Sheng1，Wang Xinqing1， Wang Dong1，Xia Tian2，Qian Shuhua1

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文章历史 +

摘要

针对传统Hilbert-Huang变换假设“信号由IMF分量(Instinct Mode Functions)与普通趋势项构成”这一固有局限，根据油压信号的自身特点，提出了基于MM-EMD(Mathematical morphology and Empirical Mode Decomposition)的Hilbert-Huang变换改进方法，并将其应用于油压信号分析处理中。该方法的基本思想如下：针对存在非IMF、非普通趋势项分量的信号，先用数学形态滤波器分离出该分量，再对剩余信号进行EMD分解与Hilbert谱分析。仿真信号与实测信号表明，新方法能取得比传统Hilbert-Huang变换更好的分析效果。

Abstract

The traditional HHT (Hilbert-Huang transform) method supposes that signal is composed of instinct mode functions (IMFs) and an ordinary trend. Considering this limitation and the characteristics of the hydraulic pressure signals, an improved HHT method based on MM-EMD (Mathematical morphology and Empirical Mode Decomposition) is proposed and applied in the pressure signals analysis. The basic idea of this method is as follows: If the signal contains the component which doesn’t belong to instinct mode function and ordinary trend, the morphological filter is used to separate this component from the original signal, and the rest signal is analyzed by EMD and HSA (Hilbert Spectral Analysis). The results of the simulation and measured signals show that compared with the traditional method, the new one obtains a better effect.

导出引用

梁升王新晴王东夏天钱淑华. 基于MM-EMD的改进HHT及其应用[J]. 振动与冲击, 2012, 31(20): 23-26

Liang Sheng;Wang Xinqing;Wang Dong;Xia Tian;Qian Shuhua. Improved HHT by MM-EMD and its Application[J]. Journal of Vibration and Shock, 2012, 31(20): 23-26