強風下の双錨泊船の振れ回りと錨鎖張力に関する模型実験

概要

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In order to find a weak point for mooring, authors carried out the model experiments on the above title problem by using of 1/50 scale model of GT 5,000 ton cargo ship. The external force acting on the model ship in a water tank with generator is wind force, no wave. The wind-direction were changed at every 15 degrees from the line drawed vertically to a line between both anchors. Main experimental results are as follows; (1) A Open-moor of which the leg angle between both chain cables is about 60° is more safety because of smaller yawing motion, as that being obtained by YONEDA. However, it should be taken notice that the shock load acting on the riding cable is greater than that at a single anchor, if the wind-direction is agreed with each cable line, and also that the most possibly raises a dragging anchor in such case. (2) Using Engine-astern in order to control the yawing motion at anchor has the effect of checking gently and smaller, as that being obtained by T.S.HOKUTO-Maru. However, such engine motion at anchor under heavy weather will be brought on the dragging anchor owing to the shortage of an anchor-holding power.
社団法人日本航海学会の論文
1982-02-25