ハッチカバー等に働く極限波浪荷重の研究

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To develop a practical estimation method for the impact load owing to deck wetness and bow flare slamming, series of model tests in regular and irregular waves were conducted. Green sea loads were measured using models of a bulk carrier and a general cargo ship. Water impact pressure on the bow flare was measured using a model of PostPanamax container ship. Applying the model of flooded waves, an estimation method of ship motion and green sea loads when the deck wetness occurs frequently is proposed. Having compared with measured data, it is found that the present method shows good agreement with the measured one. A probability density function of green sea loads is calculated by the use of the prediction method, which had been developed by the one of authors. It is found that the calculated probability agrees very well with the measured one. It is concluded that not only the validity of the present method but also the consistency of the measured green sea loads with a physical explanation. Based on these findings, the effects of the dynamic load factor of green sea loads and the bow height on the green sea loads are examined. It is found that these effects should be taken into account for the rational design load of the hatch cover. Measured water impact pressure owing to bow flare slamming in the long crested waves is calculated using the estimation method, which takes a nonlinear effect of ship hull into account. It is found that the calculated impact pressure agrees well with the measured one. A practical prediction method for a probability density function of water impact pressure on the bow flare is proposed. It is found that the calculated probability agrees with the measured one. It is confirmed that the probability density function of water impact pressure could be estimated by the use of the present method without an empirical formula.
独立行政法人海上技術安全研究所の論文
2004-04-01

ハッチカバー等に働く極限波浪荷重の研究

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