船の操縦性指数について

概要

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The Author states in this paper following results out of his research including two actual ship experiments ;(1) The equation of motion of ships under steering can be reduced to a differential equation of 1 st stage as follows.T_S(dθ^^・)/(dt)+θ^^・=K_sδ were T_s is a constant which represents the quick responsibility of ships, and K_s is a constant which represents the turning quality.Though, T_s and K_s will both vary with the curvature of the locus of ships, according to some experiments, the amount of variation is thought to be not so large.(2) The ratio K_s/T_s is a constant, i e, K_s/T_s=rudder turning moment/moment of inertia of the ship×rudder angle.and is easily calculated when the dimensions of the ship and rudder are given.So we can get K_s and T_s when either one is given.(3) It will be most reasonable to get K_s from data of steady turning experiment, i e, K_s=θ^^・_s/δ were θ^^・_s is the angular velocity of steady turning(4)T_s, K_s will both vary with the curvature of the locus of ship's C. G., i e. stronger the curvature, larger the both K_s, and T_s, in other wards, smaller the radius of turning, better the quick responsibility and worse the turning quality. But, the amount of variation is thought to be so small that we can get a close approximation of turning angle curve from initial stage to final stage using T_s and K_s got from the steady turning data.
社団法人日本船舶海洋工学会の論文