相手船妨害ゾーンから見た横切り操船特性

概要

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The Obstacle Zone by Target (OZT) is the evaluation method of collision risk between own ship and a target, considered the estimated error of ship's speed. We tried to improve the calculation method and the expression method of OZT to use it in congested water of ship traffic. We tested the use of OZT method for collision avoidance through experiment of ship handling simulator. As a result of the test, we could improve the calculation and expression method of OZT, as shown in Fig. 1. The figure shows targets as bar, length of the bar will be changed according to distance of the target and color of the bar will be changed according to course difference between own ship and the target, and OZT as several circle on a vector of the target, radius of the circle is same to a minimum distance for collision avoidance. Then, we studied to catch some maneuvering characteristic for crossing the flow of ships navigating opposite direction by using OZT. As a result, we could report the value of the space of OZT for securing safety at crossing condition, taking by the stager navigator. And this method shows that we can obtain a domain for collision avoidance like as evasive area (see Fig.5(c)).
社団法人日本航海学会の論文
2003-03-25