数字化船舶EEDI验证方法

Digital Verification Method of Ship EEDI

为提高我国内河船舶能效设计指数(EEDI)预报精度和速度,促进内河船舶能效评估的推进及能效水平的提升,研发了内河船舶EEDI数字化验证评估系统。收集典型内河船舶船模水池试验数据样本并将其分为两部分,利用其中一部分对艾尔法阻力评估计算方法进行分析和改进,在此基础上提出了适用于方形系数大的宽扁型内河双机双桨船舶阻力曲线估算和有效功率计算的改进艾尔法,利用另一部分样本对改进的艾尔法进行验证,结果表明修正版艾尔法比原方法的预报误差从9.4%降至3.4%。基于所提方法对收集的32艘实船航速数据进行测试验证,结果表明该方法预报精度高,平均误差仅2.678%,远低于船东可接受的5%的误差。最后开发了船舶EEDI数字化验证软件,以满足内河船舶EEDI经济、快速验证的需要,促进内河船舶绿色高效发展。

In order to promote the implementation of the EEDI of inland waterway ships and the improvement of EEDI level,a fast,efficient,and accurate digital forecasting method for EEDI of inland waterway ships needed to be developed.The paper collected a large number of tank test data samples about inland waterway ships and divided them into two parts.One part samples were used to analyze and improve the Ayre method resistance evaluation and calculation method,based on the research,an improved Ayre method was proposed,which was suitable for the resistance curve estimation and effective power calculation of the wide and flat inland waterway ships with twin-engine double-propeller and large square coefficient.The other part samples were used to verify the improved Ayre method,and the results show that the revised Ayre method has a much more lower forecasting errors than that of the original version from 9.4%to 3.4%,and then the ship speed forecasting method was proposed.Through testing and verification of the collected 32 real ship speeds,the results show that the method has high prediction accuracy with an average error of only 2.678%,which is far lower than the 5%error accepted by the shipowner.Finally,EEDI digital verification software was developed to meet the needs of economic and rapid verification of EEDI,and promote the green and efficient development of inland waterway ships.