船体上下振動における周辺流体の圧縮性影響

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This paper describes the effect of compressibility of fluid outside the vibrating ship hulls on the inertia and damping forces as the fluid-structure interaction. In conventional analysis of hull vibrations, fluid has been assumed to be incompressible although the effect of compressibility has not been fully understood. It is known that the compressibility is essentially important in the fields of underwater explosions, seaquake responses and sound propagation in water. In this investigation 3-D finite element analysis is carried out to calculate the pressure fields around the uniform beam vibrating vertically with sinusoidal natural modes. Added mass and damping coefficients can be expressed as functions of frequency and nodal distances. It is found that the added mass coefficient may increase up to 5 % for the hull girder vibration of typical VLCC and bulk carriers if the compressibility is considered. It is also revealed that the sound wave radiation is not likely as far as the frequency band is within the ordinary range of observed hull girder vibrations.
社団法人日本船舶海洋工学会の論文
2003-09-25