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

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (23) : 213-218.

LI Yuxing, LI Yaan, CHEN Xiao, YU Jing

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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.

Key words

variational mode decomposition / ensemble empirical mode decomposition / center frequency / ship-radiated noise / feature extraction

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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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