RESEARCH ON AUTOMATIC NAVIGATION SYSTEM IN ROUGH SEA

船舶运营成本高，船舶公司需要减少船员数量。如果将高新技术、超级计算机、遥感技术、新材料等充分应用于船舶的海洋作业中，就可以实现船舶无人自动巡航。为此，有必要设计一套能使船舶在风浪中（如台风时）自动避险的系统。当我们专注于在波涛汹涌的海上进行短期作业时，首要任务是确保船员和货物的安全。得到了一些研究结果。(1)给出了船舶在波涛汹涌的海面上运行时的两种船舶操作系统。它们被命名为“危险程度判断系统”和“避免危险的操作系统”。利用AI（人工智能）程序，根据船长的经验，将生产规则设计为船长的知识。基于人工智能的生产规则可以应用到系统中。(2)明确了台风信息的准确性对航路、航速、燃油消耗量等估算精度的影响。了解它们之间的关系是构建系统所必需的。(3)所提出的系统在避免台风对船员和货物的危险方面具有良好的性能。(4)当台风中心离船舶较远时，估计船舶航速并不一定要求其信息精度高。台风中心离船舶越近，其信息的准确性就越重要。(5)由于所提出的系统只是一个概念，对于实现无船员船舶操作还需要进一步的研究。

It is required for shipping companies to reduce the number of crews against high operation cost of ships. If high technology, super computer, remote sensing technique, new materials are fully applied to a ship for operating in the ocean, automatic ship cruising without crews will be realized.For this purpose, it is necessary to plan the system which can make a ship avoid the danger automatically in rough seags, for example in typhoon. When we focus our intention on the short time operation in very rough seas, mission of the first priority is that makes crews and cargoes safe. Some results of the studies are obtained. (1) We show the two ship operation systems which work when the ship runs in rough sea. They are named "Judge system on dangerous degree" and "Opoerating system to avoid danger". By making use of AI(Artificial Intelligence) procedure, the production rules are designed as the captain's knowledge based on his experiences. The production rules based on AI can be applied to the systems. (2) We make clear the effects of the accuracy of information with typhoon on the accuracy of estimating ship route, ship speed and fuel oil consumption etc. It needs for constructing the system to know the relationship among them. (3) The systems proposed in the study have good performance to avoid the danger for crews and cargoes in typhoon. (4) When the center of typhoon is far from the ship, the high accuracy of its information is not necassarily required to estimate the ship speed. The nearer the center of typhoon is to the ship, the more important the accuracy of its information is. (5) Since the proposed systems are only a concept, it needs to make a further investigation for realizing the ship operation without crews.