著者

寺田 大介 安川 宏紀 芳村 康男 松田 真司

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.30, pp.49-57, 2019

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<p>A roll response model during maneuvering, which can express a transient motion after steering, is proposed. The transient motion, namely the transition process from initial inward heel to outward heel, is used in the rudder–roll stabilization system. Nowadays, the model reference control is well used as an autopilot system of the actual ship. As to the model, the yaw response model such as the K–T model proposed by Nomoto is used because of the convenient adjustment of parameters. However, there is not the roll response model to be able to use for the rudder–roll stabilization. In this study, the 4th order roll response model proposed by Yasukawa and Yoshimura which was obtained from the 4 degrees of freedom (surge-swayroll- yaw) mathematical maneuvering model is focused on. And it is called as the Y–Y model in this study. Firstly, assume that the change of the rolling against steering is gradual, the Y–Y model is approximated by the 2nd order. Moreover, the modeling is done by considering the fact that the rolling due to steering is a non–minimum phase system. In order to verify the effectiveness of the proposed model, the numerical experiments were carried out. The KCS container ship was selected as the sample, since there is the information of maneuvering derivatives, which was obtained by the captive model experiments, including the effect of rolling. As the result, it can be confirmed that the proposed model can be expressed rolling in the transient situation after steering well under the assumption used in the modeling of Y–Y model. Furthermore, the procedure to estimate the parameters is also proposed by using the measured onboard monitoring data, and the effectiveness is confirmed based on the numerical experiment.</p>

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

笹 健児 寺田 大介 永井 紀彦 河合 弘泰

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.120, pp.99-106, 2009

被引用文献数

1

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From viewpoint of a ship safety and a cargo management, the examination of a criterion of judge of ferry cancel is carried out, based on both observed ship motions when the ship encounters a typhoon and coastal wave data at that time. Ship motions are observed by using 5,000GT type ferry boat. And as the wave data, coastal waves that recorded with NOWOHAS instead of the encounter wave which can not be measured, are used. These data are analyzed by Spectral Analysis and the characteristics are analyzed in detail. Moreover, numerical reproductions of ship motions based on observed coastal waves are carried out, and a couple of future problems with respect to the decision of the criterion of judge of ferry cancel are considered.

著者

寺田 大介 笹 健児

出版者

公益社団法人日本航海学会

雑誌

Navigation : 日本航海学会誌 (ISSN:09199985)

巻号頁・発行日

no.171, pp.74-76, 2009-09-30