国内外船舶水流力计算方法对比

Comparison of ship flow force calculation methods at home and abroad

针对船舶水流力计算中引用规范的范围不全、版本更新和船型应用局限等问题,选取中国、英国、美国以及OCIMF(石油公司国际海事论坛)4种现行主流行业规范进行分析研究,并以2万吨级杂货船为案例进行计算对比分析。结果表明:各国行业标准计算原理、表达形式和实例计算结果均有较大差异,美国规范考虑因素相对全面合理,英国规范在易用性方面有一定优势。横向和纵向分力曲线分布呈不同的规律。建议根据适用船型、船舶数据的翔实程度、主流向角和管理要求等因素合理选用上述计算方法,有条件时采用数值模拟方法。

Regaring the problems of incomplete scope,updated version and limited application of ship type in the calculation of ship flow force,this paper selects four current mainstream industry specifications of China,the United Kingdom,the United States and OCIMF(Oil Companies International Marine Forum)for analysis and research,and takes the general cargo ship of 20,000 tons as a case for comparative analysis.The results show that there are great differences in the calculation principle,expression form and calculation results of industrial standards in different countries.The American standard has relatively comprehensive and reasonable considerations,while the British standard has certain advantages in ease of use.The distribution of transverse and longitudinal component curves is different.It is suggested that the above calculation method should be reasonably selected according to the applicable ship type,the degree of information of ship data,the mainstream direction angle and the management requirements.The numerical simulation method should be adopted when possible.