超大型集装箱船能效设计指数优化研究

Research on the energy efficiency design index optimization of ultra large container ship

采用船型优化方法就超大型集装箱船10 000TEU的能效设计指数(EEDI)进行优化。文中以降低对主机功率的需求、提高能效设计水平为目标,优化该超大型集装箱船的阻力性能。优化时利用平移法和径向基函数方法进行船体曲面重构,并分别采用基于Rankine源非线性势流理论和边界层动量积分计算兴波阻力和摩擦阻力,最后同时使用遗传算法(NSGA-II)和序列二次规划算法(NLPQL)在设计空间中探索满足约束条件的阻力最优船型。结果表明,通过该优化方法获得的最优船型,其能效设计指数优化程度明显,能够满足现阶段IMO对新造集装箱船计及折减系数后的强制要求。

The Energy Efficiency Design Index （EEDI） of the 10000TEU Ultra Large Container Ship is reduced by ship hull-form optimization method. The drag of the ULCS at design speed is optimized in order to lower the demand for main engine power and improve the energy efficiency design level. During the process of resistance optimization, radial basis function and shifting methods are utilized to modify the hull surface; the calm-water drag is evaluated by the sum of the wave drag predicted by Rankine source method and the friction drag given by boundary layer momentum integral method. Finally, the optimum hull form is obtained via using genetic algorithm （NSGA-II） and sequential quadratic programming （NLPQL） simultaneously. Results show that the EEDI of the optimal hull form obtained by the above optimization approach can be re- duced considerably and meet the required EEDI value considering the reduction factor.