目的 对新海浪资料的特点进行研究,比较分析新旧海浪资料的差异。方法 以一艘化学品运输船、一艘LNG船和一艘邮轮为研究对象,开展船体运动和垂向波浪载荷计算,基于新旧海浪资料给出船体波浪载荷长期预报值,分析新海浪资料对船体波浪设计载荷的影响。结果 新No.34资料中,波浪覆盖海区、波浪散布图、波浪谱、波浪扩散函数以及推荐计算航速进行了更新。基于新海浪资料,船中剖面垂向预报值剪力减小18%~28%,垂向弯矩减小11%~15%。推荐的计算航速由0 kn改为5 kn,对于垂向剪力和弯矩的影响较小。结论 新海浪资料描述的北大西洋海域的海况条件恶劣程度有所降低,减小了垂向剪力和弯矩设计值。
Abstract
The work aims to study the features of the new wave data and compare the differences between the old and new wave data. With a chemical tanker, a LNG carrier and a cruise as research objects, hull motions and vertical wave induced loads were calculated. Long term prediction values of wave induced load based on old and new wave data for these ships were obtained, and the influence of the wave data on design values of load was analyzed. The results showed that the covering areas, wave scatter diagram, wave spectrum, wave spreading function and recommended calculation speed in the new No. 34 wave data were modified. Based on the new wave data, the predicted vertical shear force at the midship section decreased by 18% to 28%, meanwhile vertical bending moment decreased by 11% to 15%. The recommended speed was changed from 0 to 5 knots, which had a relatively small influence on vertical shear force and bending moment. Overall, the new wave data indicates a moderation in the severity of the North Atlantic sea states, which causes a decrease in the design values of the vertical shear force and bending moment.
关键词
IACS /
海浪资料 /
波浪载荷 /
波浪散布图 /
波浪谱 /
长期预报
Key words
IACS /
wave data /
wave induced load /
wave scatter diagram /
wave spectrum /
long term prediction
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