プロペラ逆転による制動時の船の操縦性について (第二報)

概要

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First of all, in this paper, the authors examine whether or not the assumption introduced in the first report that the hydrodynamic force caused by the adverse rotation of propeller is able to be expressed by a simple linear equation of the equivalent side-slip velocity υ_s at the stern is valid even in the case where a ship has remarkable sway and yaw motions. From the analysis of experimental results, it is found that the expression of the unbalanced hydrodynamic forces as a linear equation of υ_s ceases to be valid when the υ_s value exceeds a certain limit which varies depending on the advance constant J_p. However, the υ_s expression is still useful for determining the course stability when a ship is braked by working the propeller in the adverse direction. In order to investigate the effectiveness of the mathematical model to describe the hydrodynamic forces acting on the ship's hull which is under the braking action of propeller, ship's trajectory and time histories of some state variables are computed for various cases and compared with the experimental results observed by a free-running model.
社団法人日本船舶海洋工学会の論文
1979-06-30