外洋フェリーの運動性能に関する研究 : (第2報)フィンスタビライザーの効果及び実船の横揺特性に関する実船試験

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In the former paper the results of model test and theoretical calculations on the motions of an ocean car ferry boat in oblique waves were reported. At the same time, the actual ship tests have been carried out on the same ship. The paper presents the ship test results on the effectiveness of the fin stabilizer of lift-control type, comparing the "stand-by" and "lift-control" conditions of the fin, and on the roll characteristics of the ship, estimated by an impulsive forced oscillation technique in calm sea applying the fin stabilizer. In the test, picth, roll, roll rate, vertical and transverse accelerations at bow and fin lift are measued and analyzed by spectral and statistical methods. The following conclusions are obtained from the analysis. (1) The fin-stabilizer has considerable effect in case of beam or quartering seas, in which the rolling of the ship becomes significant. (2) The fin-stabilizer has neglegible effect on the vertical motions such as pitching and vertical acceleration. (3) It is difficult to judge the general effectiveness of the fin stabilizer quantitatively for various conditions. (4) The roll response function of the ship can be estimated by the impulsive forced oscillation method applying the fin-stabilizer. (5) In this case, the duration of the impulse and the timing of control alteration of the fin from "stand-by" to "lift-control" have considerable effect on the results. (6) The damping coefficient of the ship in navigation estimated by this method are ; κ=0.25〜0.28, which is a little bigger than that of model test result.
独立行政法人海上技術安全研究所の論文
1975-07-10

外洋フェリーの運動性能に関する研究 : (第2報)フィンスタビライザーの効果及び実船の横揺特性に関する実船試験

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