轉舵時及類似の場合に於ける船の横傾斜に就いて
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概要
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A ship is inclined inwardly toward the centre of a turning circle soon after the rudder is put over, and when she becomes to turn steadily, she inclines in the opposite side. In this paper, the inclinations of those two kinds are considered. The first inward heel is important for the safety of a ship when helmed over abruptly, and consequently for the determination of the time required to put the helm hard over, which is necessary to determine the capacity of the steering gear. Treating dynamically the motion of a ship helmed over, the expression for the maximum inward iuclination is obtained as follows : [numerical formula] where θ_0 : static 1 heel angle due to the heeling moment caused by the transverse force on the rudder plate put hard over. T_s : natural period of the ship. t_0 : the time required to put the helm hard over. A similar motion of a ship occurs in an inclining experiment, and the conditions in order to avoid the free rolling, usually accompanied, are discussed. Additionally, the motion of a pendulum on board used in that experiment is investigated. Lastly, for the outward heeling angle in the stendly turning, the breadth of the ship must be considered, though neglected usually. and the new expression for it is got as follows : [numerical formula] where θ : the required angle of heel. θ_1 : the angle of heel which is usually taken, neglecting the effect of breadth. b and d : half breadth and draft of a ship respectively. Studying the effect of a bilge keel on the heeling quality experimentally, it is found that the bilge keel is very injurious to that quality in a turning condition.
- 社団法人日本船舶海洋工学会の論文
- 1936-08-20
著者
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