損傷船舶の曳航に関する研究

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There were many accidents in the past causing oil leakage due to damage without the effective towing measures like 'Nakhodka' oil leakage incident. In the oil leakage incident of the tanker 'Braer' which drifted due to engine problems offshore of Scotland, the trial of settling up the towline failed resulting in the oil leakage of 95, 000 kl. Our country imports the large quantity of crude oil, liquid gas, and also transports and exports the domestic produced chemicals. Besides, sea areas are the course of crude oil transportation, so there is a frequent traffic of Japanese and foreign tankers. Moreover, sea condition around our country is very rough especially in winter. This may cause damaged, superannuated ships, or engine trouble, and those wrecked part of the ships would cause oil leakage, collision, explosion, or fire. Therefore the towline tension and unstable motion of the disabled and damaged ships have been investigated in this paper using the geometrical model ship in the towing experiment in order to establish the estimation method of the towing force and towing method.The towing experiment has been carried out both in still water and in waves. The towing resistance coefficients on various kinds of conditions such as towing direction, towing speed, ship status and towing points have been compared in still water. The unstable motion in regular waves has also been compared with that in still water concerning sway amplitude, yaw amplitude and yaw period. It is found that the unstable motion in waves is small compared with the case in still water on the condition of the towing speed less than 6 kt in full-scale. The yawing period is approximately equal to that in waves irrespective of ship status during towing. The towing resistance becomes proportional to third power of the towing speed rather than second power especially when the damaged ships are towed including mass of water inside the broken hull.
社団法人日本船舶海洋工学会の論文
2000-03-25

損傷船舶の曳航に関する研究

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