Effects of a Non-Cooperative Ship on the Ship Cluster Behavior

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  • 非協調行動船舶の船舶群行動に及ぼす影響
  • ヒキョウチョウ コウドウ センパク ノ センパク グン コウドウ ニ オヨボス エイキョウ

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The purpose of this research is to clarify the action characteristics of the traffic flow containing a non-cooperative ship using the cluster navigation energy and minimum distance, in order to develop the algorithm which identifies a non-cooperative ship using the position data of ships. The cooperative ship agent acted according to the ship cluster behavior model, which can start or suspend the suspicious ship recognition function and the repulsive force function. The non-cooperative ship agent performed four kinds of typical suspicious actions. The simulation results revealed the following. (1) When the cooperative ship agent can recognize a suspicious ship, the cluster navigation energy tends to change sharply and the minimum distance decreases, and a cooperative ship moves behind a non-cooperative ship. (2) When the repulsive force function works, the cluster navigation energy of ships close to a non-cooperative ship changes rapidly in most cases, and the minimum distance increases with simulation time. (3) In the traffic flow which consists of cooperative ships on which a repulsive force function works, it is easy to identify a non-cooperative ship based on the changes of the cluster navigation energy and the minimum distance.

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