荷油の有効振動質量について

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The present paper shows some hydrodynamic coefficients for correcting the mass of cargo oil or the liquid load in a tank with free surface in estimation fo the natural frequency of ship vibrations. The apparent mass of liquid cargo in a ship vibration will be calculated as virtual mass of the liquid performed inside cargo tank under consideration. So that, it will be expected that the apparent mass depends on the cross section of cargo tank and the direction of vibration.As an example, the results were presented as the ratio of apparent mass of perfect fluid with its frozen mass which filled a half in the tank of an elliptical cross section in vertical, horizontal and torsional vibrations of ships hull. It is to be noted that the apparent mass ratio and mass moment of inertia ratio are obtained less than unityt in the horizontal and torsional vibrations respectively, whereas the ratio is calculated as unity in the vertical vibration. The effects of the vibration of bottom plate of the tank of rectangular cross section upon the effective mass of general cargo and fluid in the tank which is vertically vibrating were also investigated. The apparent mass ratio in this case is greater than unity when the vibration of bottom plate is inphasae, on the contrary the ratio is less than unity in the case of out of phase of bottom vibraiton. The apparent mass ratio of the liquid cargo is some more less than that of general cargo in the case of antiphase of bottom vibration.
社団法人日本船舶海洋工学会の論文

荷油の有効振動質量について

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