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

The Society of Naval Architects of Korea (대한조선학회)
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Global Ship Vibration Analysis by Using Distributed Fluid Added Mass at Grid Points

유체부가수질량 절점분포 방법에 의한 전선진동해석

  • Kim, Young-Bok (Naval Architecture, Ocean & IT Engineering Dept. of Kyungnam University) ;
  • Choi, Moon-Gil (Machinery Design Department of SPP Shipbuilding Co., Ltd.)
  • Received : 2010.12.01
  • Accepted : 2011.03.21
  • Published : 2011.08.20
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Abstract

Recently, the ship vibration analysis technique has been well set up by using FEM. The methods considering the hydrodynamic added mass and damping of the fluid surrounding a floating ship have been well developed, so that they can be calculated by using the commercial package FEM programs such as MSC/NASTRAN, ADINA and ANSYS. Especially, MSC/NASTRAN has the functions to consider the fluid in tanks(MFLUID) and to solve the Fluid-Structure Interaction(FSI) problem(DMAP). In this study, the global ship vibration with considering the added mass distributed at the grid points on the wetted shell surface is introduced to. In the new method, the velocity potentials of the fluid surrounding a floating ship are calculated by solving the Lapalce equation using the Boundary Element Method(BEM), and the point mass is obtained by integrating the potentials at the points. Then, the global vibration analyses of the ship structure with distributed added mass on the wetted surface are carried out for an oil/chemical tanker. During the future sea trial, the results will be confirmed by measurement.

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References

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