不規則波中に於ける船の横搖に就て

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When a ship rolls among irregular waves, the effective coefficient of resistance which is given in the form [numerical formula] varies according to the relative angle θ_s and the period 2T_c of the resultant rolling composed of free and forced motions. Hence the component free and forced rollings have variable amplitudes in each swing, different from those when they take place independently of each other. Taking account of this fact there was proposed a new method of calculating the so-called criterion amplitude, in which the coefficients of resistance α and β were assumed to be constant. For four actual ships the criterion amplitudes were calculated for various values of period ratio T_s/T_w and compared with those obtained by Mr. R. E. Froude, showing about 10 per cent. difference for ships of moderate resistance. Next the practical maximum amplitude θ_<f max> which a single wave can give to a ship after an increasing swing was calculated for particular resistance to rolling, assuming the ship to be initially rolling in her natural period to the same amplitude as that of the forced rolling due to the wave under consideration. It was found that for a ship of moderate resistance the value of θ_<f max> is nearly expressed by the sum of the forced angle and the free angle after one swing in cases where T_w/T_s is less than 0・8 and greater than 1・2,and that the value of θ_<f max> divided by the maximum effective wave slope becomes greatest when T_w/T_s is a little greater than unity acoording to the degree of resistance.
社団法人日本船舶海洋工学会の論文

不規則波中に於ける船の横搖に就て

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