港内操船における曳船の支援効果について-III : 曳船使用基準に関する一考察

概要

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The way of tugboat assistance in harbour has been studied and the tug-power which needs to assist a berthing maneuver is the fundamental standard for tugboat assistance. In this paper, we discussed the conventional standard of tugboat assistance by using mathematical model and recognized it reasonable except shallow effect and, further, we could make diagrams regarding required tug-power for each elemental performance of harbour maneuvers and for each type of ships. The turning and drifting motion in harbour is the most typical combined ship handling and the final position of this motion is very important for this ship handling plan. As the result of this study, we could present the formulas to estimate the moving distance from start to final position during turning and drifting motion and confirmed that these formulas fitted simulation results acculately.
1995-03-25