フィンスタビライザー及び舵の横揺れ軽減効果について

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It is a well-known fact for a fine vessel such as a container carrier that a problem often arises for her rolling motion when she advances in quartering sea with high speed. In order to overcome this problem for rolling motion, many fine and high speed vessels recently adopt fin stabilizer system as a roll reduction device. The authors recently had a chance to investigate sea-keeping quality of a roll on/roll off vessel. In connection with this investigation, an attempt to study the effect of fin stabilizer to rolling motion was made. Model experiments to control rolling motion by fin stabillizer were carried out both in regular and irregular waves for various kinds of combination of ship advance speed and wave condition, and similar experiments to control rolling motion by rudder were carried out in addition. Theoretical approach with so-called strip method was also made by considering forces of fins or rudders to roll equation. In this report the results of both experimental and theoretical study for the effect of fin stabilizer or rudder to rolling motion are described. The results obtained in this study are summarized as follows. 1) The effect of fin stabilizer to roll reduction is assured to be remarkably large both in regular and irregular waves. 2) For fin stabilizer control system, both proportional and rate control are very effective. But the rate control is considered to be normally the best choice, because the roll reduction by rate control may generally be larger than that by proportional control, and because proportional control causes the natural period of rolling shorter, which is not desirable. 3) The computed results by the method proposed here are in a good agreement with the experimental results. Therefore the calculation method described in this report would be useful for estimation of the effect of fin stabilizer. 4) The use of rudder to roll reduction are found to be effective, but at the same time large yawing motion caused by rudder are found in our experiments. It seem that there exist some problems to be solved in the roll reduction by rudder.
社団法人日本船舶海洋工学会の論文
1978-12-30

フィンスタビライザー及び舵の横揺れ軽減効果について

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