進水速度制動ならびに船の停止位置について

概要

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When launching a vessel from the building berth facing the narrow watercourse, it is necessary to stop the vessel around the middle of the watercourse by applying the brake. There are various methods of applying the brake; and among them drags have mostly been used since old times. We also make it our usual practice to use drags. The plan to apply the brake, if mapped out in strict accordance with the following formula, will offer a satisfactory explanation about the actual application of the brake. V_0^2=2gl(μw)/W(1+α)(e^f-1)/f f=(C_xρglA)/(W(1+α)) Where: W: Launching weight α: Coefficient of added virtual mass w: Weight of drags μ: Frictional coefficient of drags V_0: Ship's speed when drag acts. l: Distance between where dragging is started and where the ship is stopped. ρ: Density of water C_x: Coefficient of water resistance of ship A: Area receiving water resistance g: Acceleration of gravity Next, as to the case that several drags are used for applying the brake, satisfactory results can be obtained by employing the above formula on the assumption that the total weight of each drag is concentrated on the gravity center of the actuating point of the drag.
社団法人日本船舶海洋工学会の論文
1958-10-25