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

  • 제55권4호
  • /
  • Pages.281-288
  • /
  • 2018
  • /
  • 1225-1143(pISSN)
  • /
  • 2287-7355(eISSN)
대한조선학회 (The Society of Naval Architects of Korea)
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Mindlin 판 이론을 적용한 단순지지 단면 접수평판의 음향방사효율 수치해석

A Numerical Analysis on Acoustic Radiation Efficiency of One Side-Wetted Rectangular Mindlin Plate with Simply Supported Boundaries

  • 이종호 (부산대학교 조선해양공학과) ;
  • 조대승 (부산대학교 조선해양공학과)
  • Lee, Jong-Ho (Dept. of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Cho, Dae-Seung (Dept. of Naval Architecture and Ocean Engineering, Pusan National University)
  • 투고 : 2018.03.14
  • 심사 : 2018.04.24
  • 발행 : 2018.08.20
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초록

Acoustic radiation efficiency is a crucial factor to estimate Underwater Radiated Noise (URN) of ships accurately. This paper describes a numerical method to analyse acoustic radiation efficiency of one side-wetted rectangular Mindlin plate with simply supported boundaries excited by a harmonic point force. Transverse displacements of plate and acoustic radiation pressures are evaluated by the mode superposition method. The acoustic radiation efficiencies analyzed by both Mindlin and thin plate theories show little differences at monopole and corner modes of low frequency regions but relatively large differences at edge and critical modes of high frequency regions. Especially, the critical frequency with the highest acoustic radiation efficiency evaluated by the Mindlin plate theory is higher than that of thin plate theory. In addition, the acoustic loading effect of fluid also increases bending wave-number of plate and its critical frequency. Finally, the acoustic radiation characteristics of plates with different aspect ratios and thicknesses through numerical analyses are investigated and discussed.

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참고문헌

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