損傷船舶の曳航に関する研究(その2) : 波浪中の索張力増加とふれまわり運動

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There occurred the oil leakage incident of the tanker named Erika at offshore of Brest in France December in 1999. The tanker has been broken into two parts and drifted resulted in sinking on the bottom of 120 m sea depth. The stern part of the ship has been towed toward the offshore in rough seas in order to protect the environmental protection of the coast. However, the fuel oil drifted from the tanker toward the coast and made a devastating damage on the coastline of the Biscay Bay. There also occurred Russian tanker Nakhodka oil leakage incident in the Japan Sea January in 1997. The drifted bow part of the tanker could not be prevented from reaching the seashore by the towing. Both oil leakage incidents are quite similar concerning the drifting of the wreck. There were quite a lots of incidents in the past in which disabled ships drifted to the seashore and oil leakage gave a tremendous damage. The authors have made a towing experiment both in still water and in regular head waves using a damaged model of geometrical ship form so far. They investigated the towline force and unstable motion during towing. They obtained the hydrodynamic coefficients during towing and analyzed the unstable motion solving the manoevoring equation together with the flow visualization techniques. They also compared the hydrodynamic force of the constrained model with the proposed estimation method resulting in a good agreement. In this report, the towing experiment on the condition of following waves has also been made as well as the head waves condition. The unstable motion and the towline tension increase in waves have been investigated experimentally.
社団法人日本船舶海洋工学会の論文
2000-09-25

損傷船舶の曳航に関する研究(その2) : 波浪中の索張力増加とふれまわり運動

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