減速横移動する船体の平均横力係数

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The lateral drag coefficient in steady state and in accelerating stage has been proposed in some studies. However, the lateral drag coefficient in the decelerating stage has scarcely been studied although the decelerating stage exists in approaching maneuvers. It seems that the coefficient in deceleration is different from that in acceleration or in steady state due to the complex wake flow field around a ship. In this paper, for the first step of the study with respect to the lateral drag coefficient in the decelerating stage, the constant braking force test is conducted. It means that the ship moving at constant speed is pulled by a constant force in the opposite direction. The distance from the start point (just after the ship is released) is measured and the velocity and deceleration are analyzed by numerical differentiation. Using the initial stage of motion, the virtual mass coefficient is analyzed. From those data sets, the mean lateral drag coefficient from the start point to the stopping position is analyzed and discussed. We obtained as following results. (1) The mean lateral drag coefficient was larger than the steady lateral drag coefficient. (2) As the braking force decreased, the mean lateral drag coefficient increased slightly. (3) The virtual mass coefficient was the almost same as that in the accelerating stage. (4) The simulation using the approximation expression of both the coefficients obtained in this study showed good agreement with the motion in the experiment.
社団法人日本航海学会の論文
1998-03-25

減速横移動する船体の平均横力係数

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