著者

世良 亘 臼井 英夫

出版者

公益社団法人 日本航海学会

雑誌

日本航海学会論文集 (ISSN:03887405)

巻号頁・発行日

vol.133, pp.107-112, 2015 (Released:2015-12-25)

参考文献数

6

被引用文献数

1 2

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When a person falls overboard at sea, the ship has to return to the scene to help the person. But it is quite hard to steer a ship back to a particular spot in the water, so some manoeuvers that make this easier are proposed.The Williamson turn is one of them. It was named for John Williamson who used it in 1942. This turn is most appropriate at night or in poor visibility, because the ship gets onto a reciprocal course when you take the proposed procedure. However, hull forms and the performance of rudders have changed greatly from when this turn was first proposed. Recent ships find it difficult to effectively use the original procedure.This paper, examines how manoeuvering factors influence the ships track using the training ship and a ship handling simulator.

著者

増田 憲司 井上 欣三 臼井 英夫 広野 康平 世良 亘

出版者

公益社団法人 日本航海学会

雑誌

日本航海学会論文集 (ISSN:03887405)

巻号頁・発行日

vol.111, pp.97-102, 2004

被引用文献数

2

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In the congested strait, Traffic route is set up by the Marine Safety Law and other regulations. As for the vessel traffic way, rectification is done by this law. But, the navigation route is restricted. In this area, very large bridge was built. And various arguments had been done about the influence of the pier in the strait by now. As a result, it was arranged outside of Traffic route. And not obstructing the navigation of the vessel is being considered with the pier. On the other hand, bridge construction is planned in the future program for land development by a strait such as Tomogashima channel, Bungo channel, too. In those area is no regulation by the route. Therefore, the existence of the pier becomes an obstacle in navigation because a very large bridge is built in the channel which a vessel navigated freely now. In this research, questionnaire investigation was done for pilots and captain. And research of the behavior consciousness about the route select by the navigation officer in the strait which a pier exists in. It is tried to modeling that how routing by officer though the analysis of the questionnaire

著者

松田 秋彦 橋本 博公 谷口 裕樹 寺田 大介 三好 潤 溝口 弘泰 長谷川 勝男 世良 亘

出版者

海洋理工学会

雑誌

海洋理工学会誌 (ISSN:13412752)

巻号頁・発行日

vol.23, no.1, pp.47-51, 2017 (Released:2017-07-07)

参考文献数

12

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As seaborne trade has greatly increased in recent years, it becomes more difficult to secure crew of ships. Therefore, it is an important issue how to realize unmanned robot ships which can automatically navigate without collisions even in congested waters. Although Rolls-Royce is planning to build a remotely controlled ship in 2020, standard control technology for unmanned ships has not been developed yet. Therefore an automatic collision avoidance system is discussed by carrying out not only computer simulations but also model experiments prior to the tests using actual vessels. For this purpose, the authors built an experimental system for the validation of automatic collision avoidance algorithm. In this paper, model experiments using multiple ships conducted at Marine Dynamics Basin at National Research Institute of Fisheries Engineering are introduced. Through comparisons with numerical simulations which the same algorithm for collision avoidance is implemented, it is found that there is a discrepancy in occurrence of collision in extremely congested situation.

著者

井上 欣三 増田 憲司 世良 亘

出版者

公益社団法人 日本航海学会

雑誌

日本航海学会論文集 (ISSN:03887405)

巻号頁・発行日

vol.98, pp.225-234, 1998

被引用文献数

36 6

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A systematic analysing procedure is needed to assess the marine traffic safety in the congested and the confined water area. Three fundamental steps should be taken into account in this procedure ; (1) the evaluation of the burden due to environmental conditions, (2) the evaluation of the load due to ship manoeuvering and (3) the evaluation of the hidden risk in the ship handling process. In the present paper as the first report of this research work, a quantitative assessment model is proposed to evaluate the stress level which is burdened to mariners under the conditions of the traffic congestion and the geographical restriction. This model makes special features of (1) the capability to aggregate the geographical environment stress and the traffic environment stress by employing the same algorithm and (2) the conquest of the lack of judgement criteria whether it is acceptable or not. This will become one of advantageous models as the assessment method of the marine traffic safety.