大型コンテナ船の構造安全評価に関する研究 : 荷重推定法の高度化

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The number of large container ship has been increasing in recent years. A large bow flare and an overhanging stern of a large container ship greatly affect nonlinear ship motions and nonlinear wave loads. Therefore, it is considered that further investigation of structural strength of such an unconventional ship is important by taking account of its unique feature of structural response. For this purpose, it is very important to evaluate loads acting on such larger ships accurately because they are very dominant on the evaluation of strength. Based on this background, the purpose of this study is intensively focused on the evaluation of loads and special response of a larger container ship. Firstly, the practical evaluation tool, which can evaluate not only wave vertical bending moment but also wave torsional moment, was developed based on nonlinear strip method approach. Secondly, validation of the present method is carried out through comparisons with a series of experiments. Furthermore, parametric rolling, which is a special phenomenon of the larger container ship and has much effect on the lashing load, is also evaluated. It is confirmed that the present method taking account of time-varying sectional hydrodynamic forces gives favorable agreement with experiments for non linear ship motion and wave loads in severe sea condition. Finally, the next action plan for the advanced assessment of structural strength by means of our tools and that extension is discussed.
独立行政法人海上技術安全研究所の論文
2012-01-31

大型コンテナ船の構造安全評価に関する研究 : 荷重推定法の高度化

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