実船の遭遇海象について : 第3報

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Authors study on the characteristics of the wave load in the reliability analysis of the ship strength from the view point of practically encountered wave condition of ships. In this report, authors research the statistical character of wave and wind conditions observed by 59 voluntary ships in the Pacific Ocean during the period of 6 years (1967-1981), to obtain the fundamental data of the wave load for an ocean going vessel. To verify the character η_μ that exaress the observed wider scatter band of such meteorological phenomena as wind velocity and wave condition, authors research the wind mesurement recorded at 24 weather stations in Japan for 20 years. It is confirmed that the value of η_μ is equal to the result of the 2 nd report. In the 2nd report, it is concluded that the scattering of each wave conditions is caused by the above η_μ and the variation of the ship operationg condition, and the effect of the latter become smaller when the ship service period is such long time as 20 years. But, it is found by the above research that the latter effect can not be disregarded when the area where ship will sail become wider. In general, an ocean going vessel does not sail in a certain limited sea zone, so it may be required to regard that the latter effct is larger than the result of the above research when we analyse the reliability of strength of such ships. The maximum value of the wave load of a ship is governed by the maximum wave height and its frequency in the encountered wave condition. Authors study on the distribution of the maximum wave height and clarify that the theoretical distribution well agree with observed maximum distribution of each wave period. From the above result, it is concluded that the coefficient of variation of the maximum wave load of a ship which operates in the same sea zone as the voluntary ships amounts between 18% and 22% and that the value increase in proportion to ship size. In the same manner as the variation of wave condition, as the area of operating zone increases the scatter band of distribution of the maximum wave load released increases and the value of the coefficient of variation of the maximum wave load of the general ocean going vessel should be taken more than the amount of 18-22%.
社団法人日本船舶海洋工学会の論文

実船の遭遇海象について : 第3報

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