傾斜したセミサブ型リグに働く流体力(第1報)

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In recent years, a large number of semisubmersible type units are used for many kinds of offshore works, because this type rig has been believed to be a most stable floating structure in waves. However, if a rig is subjected to some paticular kinds of damages that change the initial stability condition, it introduces the serious situation of semisubmersible type rig in waves. The studies of behaviour of rig with a large list angle in waves have been scarcely done comparing with ones of intact condition so far. This paper deals with the hydrodynamic forces and moments acting on a semisubmersible type rig with a large list angle in order to investigate the mechanism of capsizing phenomena of a rig in waves. Firstly the authors measure the amplitudes of motion and the steady displacements of a rig with a large list angle in beam sea condition, and discuss the effect of a large list angle on these behaviour in waves. Secondly the radiation forces and the wave exciting forces on the rig with a large list angle are measured and are compared with the results of the four kinds of theoretical calculations. Finally the drift force, the steady lift force and the steady tilt moment are shown by the experiments, and are discussed with regard to the effect of a large list angle. It is made clear that a large list angle strongly influences the steady tilt moment and scarcely affects the radiation forces and the wave exciting forces in the case of the lowerhull to be fully submerged.
社団法人日本船舶海洋工学会の論文
1984-08-24

傾斜したセミサブ型リグに働く流体力(第1報)

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