Acoustic-vibration correlation method for suppressing underwater radiated noise from ships

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (15) : 1-7.

LI Wei1, YANG Deqing1,2, LIU Xi’an1, LIU Jianhua3, MA Wangkou4

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Abstract

The coupling relationship between the hull vibration and underwater radiation noise is very complex. Identifying the parts with high correlation between underwater radiation noise and hull vibration, and determining the key factors affecting underwater radiation noise has important engineering significance for the control of ship noise. Based on the principle of acoustic-vibration coupling analysis, the vibro-acoustics correlation method was proposed for ship underwater radiation noise suppression. This method calculated the quantitative correlation evaluation indicators between the underwater radiation noise and structural vibration characteristics, the vibration source, the vibration response, and clarified the impact of various factors on underwater radiation noise. The example of the cabin section and the tugboat shows that the calculation of the quantitative evaluation indicators of the correlation is small. the index value can efficiently determine the structure and impact parameters that have high correlation with underwater radiation noise, and achieve efficient suppression of the underwater radiation noise. By adjusting the plate thickness of the wet surface near the vibration source, the sound power levels of the cabin and the tugboat were reduced by 5.66 dB and 4.84 dB, but the vibration reduction and noise reduction were not linear.

Key words

ship vibration / underwater radiation noise / correlation / noise control

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LI Wei1, YANG Deqing1,2, LIU Xi’an1, LIU Jianhua3, MA Wangkou4. Acoustic-vibration correlation method for suppressing underwater radiated noise from ships[J]. Journal of Vibration and Shock, 2023, 42(15): 1-7

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