船舶運航における安全性評価に関する研究 : 船舶操縦性能の観点より

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The ship's maneuverability is one of the important factors of the safety handling in the congested waters, however, the relation between the maneuverability and the safety is not still cleared. When the Collision avoiding is considered, the parallel course shift maneuver is typical handling pattern. There are three important factors in this maneuver. 1st one is "When it must be started", 2nd one is "How to steer", last one is "How many distance must be kept away from the target." The required advance to do this maneuver was studied in relation with the maneuvering characteristics of ships. A large ship needs longer advance than a small ship to avoid the collision. Minimum time control was employed as a base index of this distance. The obtained value by this method is the minimum, so that a human operator can not follow this control law. Simulator studies were made to know the relation between the minimum advance and practically necessary advance by human operator. According to this study, the practical advance seems to be 2 times longer than minimum advance. Owing to the observation of Marine traffic, almost vessels keep the 1.6 times of own ship's length (L) away from the target. Considering all these factors, we get the necessary area which is needed for safety maneuver. The area is defined by 1.6*L width and necessary advance being decided by its maneuverability. The safety of the specific area is decided by the ratio of the area which all ship occupied in this area to the water area. This method is verified by comparing the annual collision rate with the area ratio which is obtained by this method. (shown in Fig.8)
社団法人日本航海学会の論文
1990-09-20

船舶運航における安全性評価に関する研究 : 船舶操縦性能の観点より

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