外乱力と漂流運動についての基礎的研究

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The purpose of this study is to get basic information about a drifting motion of a ship under external forces and information about wind and wave forces as typical external forces at sea. Results found by this study are as follows. Concerning wave forces, we examined wave drift forces and moment acting on a ship in waves by numerical calculation. And we grasped several characteristics such that wave drift forces become large when wave length becomes smaller than a ship length and change of wave drift moment due to change of wave direction becomes complex as wave length becomes short. Concerning wind forces, we measured wind forces acting on 4 recent ship forms by wind tunnel tests, and we examined effect of wind velocity distribution and effect of ship equipment on wind forces. As to treatment of wind tunnel tests results obtained under different wind velocity distributions one another, we showed a simple method that transforms wind forces obtained under some wind velocity distribution into wind forces under other wind velocity distribution, but the accuracy of the method seems not necessary enough. We think that a more sophisticated method is necessary to make use of results of various wind tunnel tests executed under different wind velocity distributions. Besides wind force measurements, we grasped rough structure of wind flow field around a ship structure above water surface by flow visualization. As to a drifting motion of a ship, we discussed a steady drifting motion under regular waves. We showed possibility of several drifting motions under same wave condition, and the possibility of several drifting motions must be paid attention to when we estimate a drifting motion.
独立行政法人海上技術安全研究所の論文
1999-09-08

外乱力と漂流運動についての基礎的研究

スポンサーリンク

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