複数個の内部自由表面を有する浮体の波浪中における運動

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Recently, we carried out the conversion works of lengthening ship's body by the insertion of a new mid body section. In order to regulate the draft to meet the joint condition, the new mid body is forced to be ballasted by water. In general, when a floating body has free-surfaces in tanks, the statical stability becomes worse, and there might also occur an abnormal motion of a floating body because of the dynamic effects due to the free-water motion in tanks. In this paper, the dynamic effects of free-water motions in tanks upon the rolling motion of a floating body in regular waves are calculated, in order to obtain the relationship between a motion of a floating body and that of the free-water in tanks. As a result of the study, the resonant frequencies for the rolling motion of a floating body are numerically evaluated. The lowest resonant frequency is for the ordinary resonant rolling motion which corresponds to the free-water effects on the metacentric height, and the others are for those due to the dynamic effects of free-water in tanks. In our numerical examples, the dynamic effects of free-water increases as the depth of free-water increases, but there is no possibility of abnormal rolling motion due to the resonant motion of free-water in tanks, because the numerical results show that the resonant motion due to the dynamic effects of free-water are far smaller than the ordinary resonant rolling.
社団法人日本船舶海洋工学会の論文
1979-08-20

複数個の内部自由表面を有する浮体の波浪中における運動

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