海底形状の変化が船の運動に及ぼす効果について

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There are not so small number of papers which dealt the item of inclined bottom effect to a moving ship. One of the most famous and epochmaking papers is written by R.W.L. Gawn in 1950. Including this Gawn's research, almost all of the papers dealt a homogeneous bottom; in other words inclined bottom continuing far away from behind the ship to forward. My paper handles the problem of partially existing inclined bottom, that is, a ship sails above a flat bottom, then suddenly she senses an inclined bottom effect, and after about two ship lengths' run, she resumes to above the flat bottom again. I aimed to get qualitative data through having model ships run inertially in a tank in which small portion of an inclined bottom had been put on a flat bottom. Two model ships of a general cargo ship and a tanker of on bulb, had a fixed rudder and no screw propeller. Model ships were pushed ahead using a catapult and after that they run completely free without any actual handling. Notwithstanding the total absence of actual handling, the characteristics obtained through several repeated experiments under the same condition were almost identical. The summarization is as follows; (1) the influence of a partially existing inclined bottom to a moving ship above it is basically the same with those of a homogeneous one, (2) the influence becomes more remarkable as the incline of the bottom increases, (3) the influence depends on the depth-draft ratio and the smaller the ratio, the greater the influence and, (4) the model ships turn the head to sail toward the deeper side, consequently the tracks curve to the deep.
社団法人日本航海学会の論文
1989-09-20

海底形状の変化が船の運動に及ぼす効果について

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