横動揺に於ける船の見掛の慣性力率に就て
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概要
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This paper deals, mainly by experiment, with the apparent increase of moment of inertia in the rolling of ship, due to the surrounding water, and the following results are obtained. For the ship with bilge keel, the ratio of the apparent increase of moment of inertia to WB^2/6 (where W and B are weight and breadth of ship respectively) is proportional to the square root of the amplitude of rolling, and inversely proportional to the cubic power of the period, and consequently the period of roll decreases as the amplitude falls down. For the ship without bilge keel, that ratio is practically independent of the ampli tude, and is composed of two parts, the one being independent of the period and the other inversely proportional to the cubic power of the period. The part that is inversely proportional to (period)^3 may be attributed to the eddy fluid motion produced by the projecting portion of the hull, i.e. the bilge keel or the keel part of the aft body, but the explanation can not be given. The constant part for the ship without bilge keel, is of the same order as the calculated results by assuming the water perfect (which calculation is given in the appendix), so this part may be due to the potential fluid motion around the smooth part of the hull, in which the midship and fore bodies of the ship are included. In the present experiments, only the one model is used, so the effect of size (i.e. the scale effect) could not be studied. In the appendix, the theoretical apparent increase due to ideal water is calculated by hydrodynamical method, the results being compared with the experiment. The theoretical value for ship with b.k. is generally larger than the experimental one, but the values for ship without b.k. are very near. Also the apparent increase of mass for the case of the V・shaped body imping into the water is calculated, which may be used in some calculation of the landing of seaplane on the water.
- 社団法人日本船舶海洋工学会の論文
- 1933-10-20
著者
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