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China Ocean Engineering

, Volume 32, Issue 1, pp 51–61 | Cite as

Research on Hydrodynamic Interference Suppression of Bottom-Mounted Monitoring Platform with Fairing Structure

  • Zhen Wang
  • Yi Zheng
  • Yu-feng Mao
  • Ya-zhou Wang
  • Yan-ting Yu
  • Hong-ning Liu
Article
  • 23 Downloads

Abstract

In the disturbance of unsteady flow field under the sea, the monitoring accuracy and precision of the bottom-mounted acoustic monitoring platform will decrease. In order to reduce the hydrodynamic interference, the platform wrapped with fairing structure and separated from the retrieval unit is described. The suppression effect evaluation based on the correlation theory of sound pressure and particle velocity for spherical wave in infinite homogeneous medium is proposed and the difference value between them is used to evaluate the hydrodynamic restraining performance of the bottom-mounted platform under far field condition. Through the sea test, it is indicated that the platform with sparse layers fairing structure (there are two layers for the fairing, in which the inside layer is 6-layers sparse metal net, and the outside layer is 1-layer polyester cloth, and then it takes sparse layers for short) has no attenuation in the sound pressure response to the sound source signal, but obvious suppression in the velocity response to the hydrodynamic noise. The effective frequency of the fairing structure is decreased below 10 Hz, and the noise magnitude is reduced by 10 dB. With the comparison of different fairing structures, it is concluded that the tighter fairing structure can enhance the performance of sound transmission and flow restraining.

Keywords

bottom-mounted fairing hydrodynamic interference acoustic impedance transmission loss 

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Copyright information

© Chinese Ocean Engineering Society and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Zhen Wang
    • 1
    • 2
    • 3
  • Yi Zheng
    • 1
    • 2
    • 3
  • Yu-feng Mao
    • 1
    • 2
    • 3
  • Ya-zhou Wang
    • 1
    • 2
    • 3
  • Yan-ting Yu
    • 1
    • 2
    • 3
  • Hong-ning Liu
    • 1
    • 2
    • 3
  1. 1.Institute of Oceanographic InstrumentationQilu University of Technology (Shandong Academy of Sciences)QingdaoChina
  2. 2.Shandong Provincial Key Laboratory of Ocean Environmental Monitoring TechnologyQingdaoChina
  3. 3.National Engineering and Technological Research Center of Marine Monitoring EquipmentQingdaoChina

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