基于VMD和中心频率的舰船辐射噪声特征提取方法研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (23) : 213-218.

论文

李余兴，李亚安，陈晓，蔚婧

作者信息 +

Feature extraction of ship-radiated noise based on VMD and center frequency

LI Yuxing, LI Yaan, CHEN Xiao, YU Jing

Author information +

文章历史 +

摘要

为了有效提取舰船辐射噪声的频率特征，提出一种基于变分模态分解（VMD）和中心频率的舰船辐射噪声特征提取方法。首先采用VMD方法将三类舰船辐射噪声分解为一组有限带宽固有模态函数（IMF），然后计算各阶IMF强度，选取能量较大的IMF作为研究对象，以最强IMF中心频率及能量较大的多个IMF中心频率作为特征参数对三类舰船辐射噪声进行特征提取。针对舰船辐射噪声频率特征提取难且不精准确的问题，采用VMD方法可以准确提取IMF中心频率，实现舰船辐射噪声的特征提取。通过数字仿真和实际舰船辐射噪声信号实验分析，并与基于集合经验模态分解（EEMD）的中心频率及高低频能量差方法进行比较，结果表明该方法可以有效提取舰船辐射噪声中心频率，并实现不同类别舰船的分类识别。

Abstract

In order to effectively extract frequency characteristics of ship-radiated noise,a novel feature extraction method for ship-radiated noise was proposed based on the variational mode decomposition (VMD) and center frequency.Firstly,three types of ship-radiated noise were decomposed into a set of intrinsic mode functions (IMFs) with limited bandwidth using VMD,respectively and then the intensity of each IMF was calculated.IMFs with higher energy were selected as study objects,the central frequency of the strongest IMF and central frequencies of several IMFs with higher energy were taken as feature parameters to conduct feature extraction for three types of ship-radiated noise.Aiming at problems of frequency feature extraction of ship-radiated noise being difficult and inaccurate,the VMD method could be used to accurately extract the central frequency of IMF,and realize the feature extraction of ship-radiated noise.The proposed method was applied in feature extractions of simulated and actual signals of ship-radiated noise.The results were compared with those using the central frequency method and the difference between higher frequency energy and lower frequency energy method based on EEMD.The results showed that the proposed method can be used to effectively extract the central frequency of ship-radiated noise and realize the classification and recognition for different types of ships.

导出引用

李余兴，李亚安，陈晓，蔚婧. 基于VMD和中心频率的舰船辐射噪声特征提取方法研究[J]. 振动与冲击, 2018, 37(23): 213-218

LI Yuxing, LI Yaan, CHEN Xiao, YU Jing. Feature extraction of ship-radiated noise based on VMD and center frequency[J]. Journal of Vibration and Shock, 2018, 37(23): 213-218

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