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Acta Armamentarii ›› 2025, Vol. 46 ›› Issue (4): 240392-.doi: 10.12382/bgxb.2024.0392

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Analysis of Flow Noise of Underwater Vehicle with Outboard Recovery Devices Based on Acoustic Analogy Theory

DU Xiaoxu*(), LI Hanyu, LIU xin   

  1. School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, China
  • Received:2024-06-18 Online:2025-04-30
  • Contact: DU Xiaoxu

Abstract:

The recovery device carried outside the vehicle is susceptible to the interference from flow noise and has an effect on the acoustic stealthiness of underwater vehicle during the acoustic guidance.Regarding the aforementioned problems,this paper numerically simulates the flow noise of underwater vehicle based on Lighthill acoustic analogy theory and large eddy simulation (LES),compares the sound pressure level spectra and directivities of different shaped docking stations,and analyzes the sound pressure levels at different locations in the basin.The results show that the outboard recovery device is the main source of the radiated noise,which is about 50 dB higher than the maximum sound pressure level of the non-attached underwater vehicle,and the high sound pressure level is mainly concentrated between the middle and low frequencoes.For the recovery dock with the same profile areas,the maximum sound pressure level of horn-shaped guide housing is 1.62dB lower than that of the rectangular guide housing.The results can provide theoretical reference for reducing the flow noise during the process of underwater vehicle recovery and improving the recovery efficiency and acoustic stealth of underwater vehicle.

Key words: underwater vehicle, flow noise, sound analogy theory, large eddy simulation, fluid acoustic coupling