大型船の疲労強度検討のための船側変動圧に関する研究

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Fatigue analysis becomes more important recently at structural design stage of large ships, such as VLCC and large bulk carrier. In fatigue analysis of a ship, it is necessary to know precisely how the distribution of dynamic pressure on the hull is and how much the amplitude of the pressure or resulting stress is. Hydrodynamic pressures on the hull of a ship in waves usually consist of the following two components ; outer pressure due to incident waves and resulting ship motions, and Inner pressure due to the acceleration of the liquid cargo and/or ballast water. As for the former one, there exists a big problem in nowadays design stage, that is ; pressure acting on the side shell between actual wave surface and still water line cannot be calculated by linear theories. On the other hand, there are two types of assumption are adopted so far in order to estimate the inner pressure. Under one assumption, the point of zero-pressure is taken to be on the wall where the acceleration is negative, while the point is on the center of the tank under another assumption. Although the validation of these two assumptions is not easy, it is necessary to know how much the difference in the results is. Moreover, phase differences of these outer and inner pressures are important in fatigue analysis. In the present paper, hydrodynamic pressures of large ships in waves are investigated for fatigue anaylsis. Considering the abovementioned problems, the characteristics of the outer and inner pressures are clarified.
社団法人日本船舶海洋工学会の論文

大型船の疲労強度検討のための船側変動圧に関する研究

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