Abstract
This study deals with the influences of probability density distribution of exceeding lasting-time on deck wetness for ocean-going ships. Using the envelope theory for the random functions, a general formula for approximation calculation of density function between zero level is induced and expanded to the problems above a given non-zero level. A supplementary algorithm of estimating the time lasting period for deck wetness is also induced in this paper. Comparing results in the distribution range between the 1st quarter number and 3rd quarter number of probability density, the reliability of the proposed method to estimating the deck wetness for ocean-going ships is also confirmed. Based on wave statistics data, GWS, the deck wetness related to freeboard sea zones of ILLC 1966 is appraised by discussing exceeding lasting-time during which the amplitude of relative motion between deck and wave surface remains above a level of freeboard. A series of numerical calculations are executed for an ocean-going container ship based on the 5 freedom ship motions theory (the Ordinary Strip Method, OSM), and it is certified that the lasting time affects the trend of deck wetness.
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