簡易渦モデルを用いた操縦運動中の主船体流体力の成分分離型数学モデル(その5) : 旋回で生ずる船体中央部渦による補正

概要

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The component-type mathematical model of ship hydrodynamic forces developed by us can describe precisely the oblique hydrodynamic forces over the range of drift angle |β|=0〜90°or 90〜180°. It also can estimate satisfactorily the turning hydrodynamic forces X, Y and N in the simulation of steering motion through the oblique hydrodynamic forces. The mathematical model shows the quantitative discrepancies in the estimated Y hydrodynamic forces of pure (β=0°) and lateral (|β|=90°) turning motion. This paper offers a solution to these discrepancies by adding the horse-shoe vortex system and the additional effect of the cross-flow vertical vortex system, which are located at midship part and caused by turning motion, to the conventional vortex systems presented in the previous paper. The characteristics of the oblique hydrodynamic forces can estimate precisely the linear derivatives Y_r and the large effects of cross-flow drag in turning motion.
社団法人日本船舶海洋工学会の論文