Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Analysis of Acoustic Radiation Efficiency and Underwater Radiated Noise of Double Bottom-shaped Structure

이중저 형상 구조물의 음향방사효율과 수중방사소음 해석

  • Choi, Sung-Won (Department of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Kim, Kook-Hyun (Department of Naval Architecture, Tongmyong University) ;
  • Cho, Dae-Seung (Department of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Suh, Kyu-Youl (Department of Naval Architecture, Tongmyong University)
  • 최성원 (부산대학교 조선해양공학과) ;
  • 김국현 (동명대학교 조선공학과) ;
  • 조대승 (부산대학교 조선해양공학과) ;
  • 서규열 (동명대학교 조선공학과)
  • Received : 2011.11.24
  • Accepted : 2012.03.13
  • Published : 2012.04.20
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Abstract

Recently, reducing underwater radiated noise (URN) of ships has become an environmental issue to protect marine wildlife. URN of ships can be predicted by various methods considering its generating mechanism and frequency ranges. For URN prediction due to ship structural vibration in low frequency range, the fluid-structure interaction analysis technique based on finite element and boundary element methods (FE/BEM) is regarded as an useful technique. In this paper, URN due to a double bottom-shaped structure vibration has been numerically investigated based on a coupled method of FE/BEM to enhance the prediction accuracy of URN due to the vibration of real ship engine room structure. Acoustic radiation efficiency and URN transfer function in case of vertical harmonic excitation on the top plate of double bottom structure have been evaluated. Using the results, the validity of an existing empirical formula for acoustic radiation efficiency estimation and a simple URN transfer function, which are usually adopted for URN assessment in initial design stage, is discussed.

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References

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