小障害物の存在に適用できる不安全操船モデルの改善とその応用について

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Unsafe Ship-handling model (US-model) is known as the evaluation tool suggests the potential risk of marine accidents. Conventional US-model such as the above, however, has error for its discrete processing when it evaluates the small obstacle such as the buoy or the bridge pier. In this paper, we aims to improve the conventional US-model that treated the judgment element as the disintegration value to be able to judge about the progress of continues time and evaluate the influence for the occurrence of unsafe situation for small obstacles such as the bridge pier or the buoy definitely. In ship-handling simulator, we set the experiment sea area that has the bridge which has various pier to pier distance and 80m pier diameter. From the data of experience result, we compared an output result by conventional US-model and by improved US- model when the size of pier diameter was changed. From the above, we cleared that if the obstacle became less than 80m, the gap of calculation results between conventional and improved model was occurred, and it comes to application limit of conventional model, and to application area of improved model. In addition, the tendency of calculation results according to various pier to pier distances and the size of pier diameter by improved model showed the utility. In conclusion, it may be said that improved model can evaluate influence for danger of collisions for a small obstacle such as the pier or the buoy, correctly.
社団法人日本航海学会の論文
2007-03-25

小障害物の存在に適用できる不安全操船モデルの改善とその応用について

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