著者

小池 裕二 佐伯 愛一郎 牟田口 勝生 今関 正典 宮部 宏彰 山下 誠也

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

vol.1999, no.185, pp.111-117, 1999 (Released:2009-09-04)

参考文献数

6

被引用文献数

2

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An actively controlled anti-rolling system has been developed with a view of reducing the rolling motion of ship. It is a new type of anti-rolling systems to replace the conventional systems, such as anti-rolling tank and fin stabilizer, and is of hybrid type combining the pendulum-base passive type with active type driven by relatively small electric motors. This system is composed of a moving weight oscillating on rail shaped in circular arc, carrying the driving motors and reduction gears, and the passive, compact mechanism is realized. The driving force to control the movement of the moving weight is imparted from the electric motors through reduction gears connected to a lack and pinion mechanism. The actual system of a moving weight of 100 tons has been applied to oceanographic research vessel “MIRAI” (8672 GT.) for practical use. Prior to service at open sea areas, the control system has been designed based on the identified parameters of ship motion characteristics obtained by results of forced rolling oscillation test using anti-rolling system in the calm sea. Control performance and dynamic behavior have been analyzed by recorded data of ship motion and displacement of moving weight at open sea areas. It has been revealed that the system operated following the control law and provided performance to be aimed in design.

著者

小池 裕二 吉海 研 広重 栄基 谷田 宏次 牟田口 勝生

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

日本造船学会論文集 (ISSN:05148499)

巻号頁・発行日

vol.1994, no.176, pp.137-143, 1994 (Released:2009-01-08)

参考文献数

3

被引用文献数

1 2

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An actively controlled anti-rolling system has been developed with a view of reducing the rolling motion of a ship by the movement of the mass controlled by actuator. It is of hybrid type combining the pendulum-base passive type with active type driven by a relatively small electric motor. The hybrid type has merits of (a) providing almost the same damping performance as active type (depending solely on actuators for obtaining controlled movement of damper mass), while requiring only a much smaller control force for moving the damper mass, and (b) continuing to function solely on its passive mechanism in the event of power failure. This system consists of a sliding mass on the rail shaped in a circular arc, and the compact, passive pendulum mechanism is realized that does not require a suspension structure such as a simple pendulum or spring mechanism. The driving force to control the movement of the damper mass is imparted from the electric motor through reduction gearing connected to a gear and pinion mechanism. The LQ control theory has been adopted for controlling the damper mass. At-sea experiments were performed with a ship (weight approx. 190t) to verify damping effects of the hybrid anti-rolling system. The rollings were reduced to about 1/3 in beam seas under the condition that the ship was stationary. The performance was further compared between hybrid type and passive type. Hybrid type promised better damping performance by 15% than passive type. The hybrid type also attenuated rollings with a forward speed of ship to about 1/2 in following seas, in the case of which passive type presented difficulty of providing damping effects markedly. Good agreement was obtained between measurement and calculation.