The speed ratio is an important factor that must be considered when two vessels will course change to avoid collision. In the process of the research on Personifying Intelligent Decision-making for Vessel Collision Avoidance (short for PIDVCA), it is found that the effect of collision avoidance based on the existing "International Regulations for Prevention Collision at sea" (short for COLREGS) is greatly affected by the high speed ratio (k=Vt/V0≥1.5). Through the analysis on the geometric change law of two vessels' relative motion in Open waters, the effects of the responsibility for the ship collision avoidance under the COLREGS and special case for high-speed ratio is discussed. According to the collision avoidance measures taken for two vessels encounter situation, some reasonable suggestions are put forward and the simulation experiments that based on shipʹs intelligent collision avoidance simulation platform are given to support the idea.
This paper puts forward a new design of intelligent navigational simulator due to the fact that the target ships in the current existing navigational simulator at home and aboard which does not have the capacity to automatically give way to other ships to avoid collision. The Designed navigational simulators in which the both target ships and own ships have the ability of anti-collision which makes a big improve on the current navigational training effectiveness. The new designed simulator ,on one hand, can instruct the trainer to take correct action to avoid collision, on the other hand, the target ships in the training exercise can intelligently navigate according to the seaman ordinary practice or《COLREG 1972》at the current traffic situation which is much closer to the real situation on the sea. On the base of the research of algorithm of automatic anti-collision, the raw system frame and basic principle of the intelligent navigational simulator and some typical experiment and analysis is also given.
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