Development of Marine Transport System for Society in the Future

为了防止海上事故造成的生命损失和环境污染，对航行安全提出了很高的要求。误解、误判等人为失误是造成海上事故的原因之一。因此，引入自动导航设备是解决这一问题的方法之一。另一方面，在通常拥挤的港口，人工导航仍然是有效的。在本研究的第一年，船舶自动避碰系统采用了阻塞区域的概念。为了评估船舶间的碰撞风险，引入了阻塞区。该系统是在数值模拟的基础上设计的。采用船舶与抛锚船舶避免碰撞的假设情景来评估系统的性能。第二年对自动避碰系统进行了改进，实现了高效避碰。在此基础上对该系统进行了改进，以适应巡航船围绕本船存在的情况。在此基础上，建立了由一对实时运动GPS （RTK-GPS）接收机、光纤陀螺罗经和PC机组成的实验系统，通过模型试验验证了自动避碰系统的有效性。在最后一年，提出了基于阻塞区域的船舶避碰算法。通过模型实验验证了该系统的有效性。从模型实验结果来看，期望该自动避碰系统具有在交叉口情况下避碰的能力。

Navigational safety is highly demanded in order to prevent marine accidents which causes losses of life and environmental pollution. Human mistakes such as misunderstanding or misjudgment are one of the causes of marine accidents. Therefore, introduction of automatic navigation devices is one of the solutions for the problem. On the other hand, manual navigation is still efficient at harbor where is usually overcrowded.In the first year of this study, automatic collision avoidance system for ships using the concept of blocking area. The blocking area is introduced in order to evaluate collision risk among ships. The system was designed based on numerical simulations. The scenario which assumes that a ship avoid collision with an anchored ship was adopted to evaluate the performance of the system.In the second year, the automatic collision avoidance system were improved in order to realize efficient collision avoidance. Then the system was enhanced for the situation that cruising ship exists around own ship. Furthermore, experimental system which consists of a pair of Real time Kinematic GPS (RTK-GPS) receiver, a optical fiber gyrocompass and a PC was developed in order to investigate the effectiveness of the automatic collision avoidance system by model tests.In the final year, collision avoidance algorithm for ships which is encountering crossing or meeting ship using the concept of blocking area was developed. Then model experiments were carried out to verify the effectiveness of the system. It is expected that the automatic collision avoidance system has the ability to avoid collision at crossing situation from the results of model experiments.