基于EEDI的小水线面双体船片体尺度要素多目标优化

Multi-objective Optimization on Demi-hull Dimensions of Small Water-plane Area Twin Hull Vessel Based on EEDI

为寻求节能高效的小水线面双体船片体尺度要素,以一艘典型小水线面双体渡船为研究对象,从多目标优化的角度出发,做出合理假设根据海军部系数法和国际吨位丈量公约分别将子目标设计航速和总吨参数化,进而使主目标能效设计指数(EEDI)成为片体尺度要素函数。基于MATLAB优化工具箱应用多目标遗传算法(MOGA),以阻力、强度、结构和能效要求等因素为依据定义约束条件,设置优化参数并考虑混合函数的影响,得到优化船型Pareto解集。最后给出多目标优化的计算结果,并且与单目标优化的结果进行比较,同时分析多目标优化优化船型方案中片体尺度要素的分布情况。

In order to search for energy-saving and efficient dimension of demi-hull in small waterplane area twinhull(SWATH)ship,the thesis takes a typical SWATH ferry as the research object.From the perspective of multi-objective optimization,a reasonable assumption is made to parameterize the sub-objective design speed and the total tonnage respectively according to the Admiralty Coefficient method and the International Convention on Tonnage Measurement of Ships,so as to convert the energy efficiency design index(EEDI)of the main objective to dimension function.Based on the MATLAB optimization toolbox,the author applied the Multi-Objective Genetic Algorithm(MOGA)to define the constraints according to the resistance,strength,structure and energy efficiency requirements and so on,setting the optimization parameters while considering the influence of the mixed function.The Pareto solution set of the optimized ship type is obtained.Finally,the calculation results of multi-objective optimization are discussed,and compared with the results of single objective optimization.Meanwhile,the distribution of sheet size elements in multi-objective optimization scheme is analyzed.