An automatic extraction method of propeller shaft frequency based on sequence matching

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (16) : 57-61.

YANG Rijie1,ZHENG Xiaoqing1,HAN Jianhui1,LI Dawei2

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Abstract

As it is difficult to extract the propeller shaft frequency of underwater acoustic targets automatically such as ships, submarines and so on, this paper proposed an extraction algorithm of propeller shaft frequency of underwater acoustic targets based on the average energy accumulation and pulse sequence matching.First, the algorithm enhanced the line spectrums of DEMON by fusing the modulated information of different frequency band with an improved multi-band fusion method.Then the line spectrums of the propeller shaft frequency or its harmonics was extracted by the average energy accumulation.Finally, the method of sequence matching was applied to calculate harmonic numbers of the line spectrums extracted, and the propeller shaft frequency was extracted automatically.As verified in the test, the algorithm works very well.

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YANG Rijie1,ZHENG Xiaoqing1,HAN Jianhui1,LI Dawei2. An automatic extraction method of propeller shaft frequency based on sequence matching[J]. Journal of Vibration and Shock, 2018, 37(16): 57-61

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