Study on Prediction Method for Shipping Water Load and Volume due to Green Sea
Study on Prediction Method for Shipping Water Load and Volume due to Green Sea
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绿海航运水负荷及水量预测方法研究
DOI：
10.2534/jjasnaoe1968.1999.61
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
S. Ishida
中科院分区：
文献类型：
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作者：
Y. Ogawa;H. Taguchi;S. Ishida
为了建立船舶水负荷和水容积的长期预报方法，进行了模型试验。采用日本国内航行的货船和油轮模型，前者在规则波/不规则波中，后者在不规则波中。对于货船，改变了船首外展形状和船首高度，以研究它们对船首甲板上的载荷和体积的影响。文中提出的“洪水波”理论对油轮的这些物理量有较好的估计，并与货船的实验结果进行了比较。验证了该理论同样适用于不同艏宽形式和艏高的货船，并讨论了艏宽形式和艏高对船舶运动、艏相对水高、船舶水载荷等的影响。结果表明，船首张开形式对船舶水载荷、水容积和水压力的影响相对于船首高度的影响较小，基于船舶水载荷和水容积与船首上方水面高程的平方成正比的结论，提出了其概率密度函数，并用于短期预报。结果表明，所提出的函数与实测分布，特别是尾部的一致性，优于传统的方程。利用这些函数，对船舶水负荷和水量进行了长期预测。
Model tests were carried out in order to develop a method for long-term prediction of shipping water load and volume on bow deck. Models of a cargo ship and a tanker for Japanese domestic voyage were used, the former in regular/irregular waves, the latter in irregular waves. As for the cargo ship the bow flare form and bow height were varied from the original one to investigate the effect of them on the load and volume on the bow deck. The theory of “flood waves”, which gave a good estimation for these quantities of the tanker in the previous paper, was compared with the experimental result of the cargo ship. It was confirmed that this theory can also be well applied to the cargo ship at various bow flare form and bow height.The effect of flare form and bow height on the ship motion, relative water height at bow, shipping water load and so on was discussed. It was found that the effect of bow flare form on shipping water load, volume and pressure is small compared to the effect of bow height.Based on the result that shipping water load and volume is proportional to the square of the water elevation over the bow top, their probability density functions in short-term prediction were proposed. It was confirmed that proposed functions show a good agreement with the measured distributions, especially the tails of them, better than conventional equations. Using these functions, long-term predictions of shipping water load and volume were carried out.