低速時における主船体操縦性流体力の新しい数学モデルについて : 斜航時の場合

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Moving at slow advance speed, a ship has a motion largely affected by any existing external forces and control forces. Then it moves with drifting angles which vary from small to large. Accordingly, when simulating ship maneuvering motions, the hydrodynamic lateral force Y" and the yaw-moment N' varying largely with ship's drifting angle, should be discribable by simple and accurate mathematical models covering all ranges of drift angle. For the purposes of developing the mathematical model, this paper adopts two important components of force : a linear lift force we call Y'_<uv>u'v', dominant within the range of small drift angles, and a cross flow drag force, C_<D90>m'_0v'^3, dominant within the rang of large drift angles, where C_<D90> is a cross flow drag coefficient of lateral ship motion and m'_i is an order i moment of the ship's profile area about midship. Futhermore, a nonlinear lift force, Y'_<uvvv>u'v'^3, is adopted for accurate description of the hydrodynamic force in the range of moderately large drift angles. We propose the following new mathematical model described within a wide range of drift angles: Y'=Y'_<uv>u'v'+Y'_<uvvv>u'v'^3+C_<D90>m'_0v'^3 N'=N'_<uv>u'v'+N'_<uvvv>u'v'^3+C_<D90>m'_1v'^3 In order to verify the models mentioned above, oblique tow tests were carried out using two fishing vesselr : one was a 1/21.5 scaled model of a 225 GT fish carrier boat at with one load condition and the other a 1/6.5 scaled model of a 6.5GT coastal small fishing boat at with nine load conditions. According to this analysis, these mathematical models have been found to fit closely experimental values of hydrodynamic lateral force and yaw moment.
社団法人日本船舶海洋工学会の論文
1988-06-30

低速時における主船体操縦性流体力の新しい数学モデルについて : 斜航時の場合

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