著者
Takefumi Higaki Hirotada Hashimoto Hitoshi Yoshioka
出版者
公益社団法人 日本船舶海洋工学会
雑誌
日本船舶海洋工学会論文集 (ISSN:18803717)
巻号頁・発行日
vol.36, pp.137-148, 2022 (Released:2023-01-31)
参考文献数
32

Automatic collision avoidance is of significant importance to prevent maritime collisions. Although many studies have been conducted in recent years, autonomous system has not completely replaced human captains since it is still difficult to imitate their complicated decisions. Thus, the present paper tries to investigate and imitate experienced captains' maneuver using maximum entropy inverse reinforcement learning (MaxEnt IRL). We firstly verify that MaxEnt IRL can reproduce appropriate reward function from demonstrative trajectories. Afterwards, we conduct an experiment on a simulator where well-experienced captains maneuver in congested sea and estimate reward from the trajectories. Searching the route which maximizes the obtained reward, finally, we demonstrate the optimized route can avoid collision against multiple ships in compliance with the International Regulations for Preventing Collisions at Sea (COLREGs).
著者
ニッポン・シーライン株式会社
出版者
公益社団法人 日本船舶海洋工学会
雑誌
らん:纜 (ISSN:09160981)
巻号頁・発行日
vol.10, pp.25-26, 1990-12-30 (Released:2018-02-24)

本船ロイヤルウィング号は,関西汽船株式会社が建造がした,阪神と別府を結ぶ瀬戸内海の新婚旅行ルートに就航していた『くれない丸』を動く海上レストランとして,大改造したものです. 首都圏では初めての,横浜港より東京湾内への洋上ラストラン船であり,平成元年3月より,藤木企業グループがマリンレジャー関連会社ニッポンシーラインを設立し,運行を開始したものです.
著者
安齋 圭祐 日野 孝則 山内 豊 水野 滋也
出版者
公益社団法人 日本船舶海洋工学会
雑誌
日本船舶海洋工学会論文集 (ISSN:18803717)
巻号頁・発行日
vol.35, pp.1-12, 2022 (Released:2022-09-07)
参考文献数
22

This paper describes the hull form optimization method of an icebreaker. In this optimization method, hull forms are generated by the original method we develop. The objective functions to be minimized are ice resistance in level ice and wave making resistance in open water. A multi-objective genetic algorithm is adopted as a numerical optimizer. We optimize a hull form which has the same hull form parameters as the preliminarily designed hull form for an application example. The optimization result provides many hull forms which have different balances of both objective functions as the Pareto solutions. It is found that some hull forms have better performance both in ice and open water conditions than the preliminarily designed hull form. We can develop an icebreaker hull form efficiently using the present optimization method.
著者
鈴木 啓介 佐久間 俊
出版者
公益社団法人 日本船舶海洋工学会
雑誌
日本船舶海洋工学会論文集 (ISSN:18803717)
巻号頁・発行日
vol.11, pp.51-59, 2010 (Released:2011-01-28)
参考文献数
9
被引用文献数
1

When a high speed vessel is designed, it is important how we make her sectional area curve effectively on purpose to minimize the hull resistance. But on a sectional area curve, there are, in general, some constraints caused by the requirement of ship arrangement and we cannot reject them simply because we must build not only a small resistance ship but also an easily operable ship. A sectional area curve under these constraints is usually made from the experience of designers by referring one of a type ship, but we don't think we can get a true optimal curve easily only by the experience.In this report, we introduce the linear wave-making resistance theory into the optimal problem and Series 64 model 4793 is chosen as the object for analysis. The sectional area curve of Series 64 model 4793 is expanded into Mathieu function series and the performance is evaluated from the viewpoint of the wave-making resistance. Then we make the optimal curve for the improved hull form theoretically using calculus of variation under some constraints which are established artificially by us.Finally, we carry out resistance experiment of the improved hull form to evaluate our optimal method and it shows good result that the residual resistance of improved hull form becomes around the half of that of the original hull form.