基于字典排序方法的螺旋桨优化设计

Propeller optimization design based on lexicographic ordering approach

为实现螺旋桨效率在一定的设计进速系数范围内的最佳化,本文以母型桨设计进速周围多个进速点对应的敞水效率为目标函数,以螺距比的径向分布为优化变量,以推力和空泡性能为约束条件建立优化数学模型,基于字典排序方法对优化模型进行求解。得到了优化后的螺旋桨螺距比径向分布,并将优化结果与以设计航速点的螺旋桨效率为目标进行优化后的结果进行对比。结果表明,由于船舶航行时航速的变化,以设计航速点的效率为目标进行螺旋桨优化往往达不到预期的节能效果,需要综合考虑设计航速周围内多个工况点对应的效率。

In order to realize th coefficient, taking the open water effic function, the optimization model was radial distribution of the ship speed the method w e propeller efficiency optimization in the range of the design advance objective optimized ch ratio was obtained. The optimized results shows that due to the changes of h takes the efficiency of design velocity as the objective function fails to achieve the expected energy-saving. And the multiple operating speed was supposed to considered. points corresponding efficiency around designed