船舶の横揺れの長期間における統計分布

概要

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The irregularity of the natural phenomena e.g.sea waves is expressed by Rayleigh distribution in short times. In the course of time the mean of this distribution varies approximately according to the logarithmico-normal distribution, and so the whole distribution and that of the maximum values in some portions of time may be also expressed by this distribution. The engineering quantities induced from these phenomena e.g. rolling angles of ships are also expressed by these distributions.The logarithmico-normal distribution is made to fit better to statistical data, taking the lower limit not as zero and the upper limit not as infinity. The author has tried to decide these limits or parameters so that the skewness and the peakedness of values transformed from data by some function may agree to medians of those of sample values from the normal distribution. He has also calculated the error of the estimate of the rolling angle arising from the error of the estimation of parameters.Rolling angles of ferry boat Sorachi-maru were measured in 32 voyages and their distribution in long times was calculated.
社団法人日本船舶海洋工学会の論文