大洋を航行する船舶の甲板冠水の予測

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This study presents a new statistical prediction method for deck wetness on ocean-going ships. The deck wetness is one of the most important performance factor of seaworthiness. When the characteristics of deck wetness are investigated in relation to loads on deck due to shipping of water, seakeeping quality etc, the deck wetness generally means the situation in which the relative motion amplitude between deck and wave surface exceeds the freeboard. The excess has two physical natives, that is, the magnitude of the amplitude and the time during which the amplitude remain above a level of freeboard. Until now, many studies have been proposed in relation to the former, but few studies have been done for the later. Therefore, this paper proposes a practical method for estimating statistically the time period (lasting time) related to deck wetness in sea waves. The method is constructed with the basic statistics and the 5 freedom ship motions theory (the Ordinary Strip Method, OSM). A series of numerical calculations are executed for an ocean-going container ship by using the method, and it is certified that the lasting time affects the trend of deck wetness.
社団法人日本船舶海洋工学会の論文