著者

本田 啓之輔 小須田 敏

出版者

公益社団法人 日本航海学会

雑誌

日本航海学会論文集 (ISSN:03887405)

巻号頁・発行日

vol.66, pp.145-152, 1982

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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.

著者

本田 啓之輔

出版者

公益社団法人 日本航海学会

雑誌

航海 (ISSN:24331198)

巻号頁・発行日

vol.101, pp.11-17, 1989-09-25 (Released:2017-07-12)

著者

本田 啓之輔 松木 哲 井上 欣三

出版者

公益社団法人 日本航海学会

雑誌

日本航海学会論文集 (ISSN:03887405)

巻号頁・発行日

vol.57, pp.107-118, 1977

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In order to find more safety and more suitable mooring system of a moored ship to a quay by means of mooring lines and fenders in a harbour under the heavy weather such as typhoon, authors carried out a series of experiment by using of 1/50 scale models in the water-tank equipment and recorded time histories on the tension load of mooring lines, the impact force against fenders and the ship's motion with six degrees of freedom, in oblique, head and beam seas to the quay wall. We considered the case of GT 5, 000t cargo ship (Lpp=115m) moored to the quay by eight ideal mooring arrangements at 14m in the depth of water rising up to the top of quay wall. The wave condition acting on the ship were extensively changed with regard to the wave length, wave height and attack angle of wave to the quay. In addition to these experiments, we carried out another series of the model experiment for a dolphin-ship mooring in order to realize the validity of the theorical computation by the linearized numerical model of a mooring system which was developed by Japan Ship Research Association.

著者

本田 啓之輔 松木 哲 井上 欣三

出版者

公益社団法人 日本航海学会

雑誌

日本航海学会論文集 (ISSN:03887405)

巻号頁・発行日

vol.59, pp.119-134, 1978

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Authors carried out the model experiment for two buoys-mooring system, in the case of GT 5,000t cargo ship, in order to find the critical wave conditions which exist for safe buoy mooring in the harbour under the heavy weather. The wave condition acting on the ship were extensively changed regard to the wave length, wave height and the attack angle of wave to the fore and after buoys center line. As main results for the model experiment in regular wave, it is emphasised that the most important factors affecting the tension of buoy's mooring lines are the drifting force due to the wave than the amplitudes of the periodic ship's motions with six degrees of freedom, and that the critical height of waves for safe buoys mooring may be given 0.8m in the full draft condition and 1.0m in the half draft condition in beam seas to the ship. In addition to these experiment, the simulation for the ship's motion and mooring force were carried out by the linearized numerical model of the multiple buoys mooring system which was developed by the Japan Ship Rerearch Association.