高速列车受电弓舱气动外形多目标优化设计OA

In order to improve the aerodynamic performance in the process of the train operation and reduce operating cost,the principle of computational fluid dynamics is used to carry out numerical simulation calculation of four kinds of built-in pantograph cabin structures,namely rectangular,elliptical,capsule and hexagon with refrence to the aerodynamic structure profile of pantograph cabin.The results show that the rectangular built-in pantograph cabin structure can maximize the aerodynamic performance of drag and lift of pantograph.On this basis,the main structural parameters of the rectangular built-in pantograph cabin are taken as the optimization variables,and the aerodynamic drag and aerodynamic lift of the pantograph are taken as the optimization objectives.Then the experimental design method of Optimal Latin Hypercube design is selected to establish the approximate response surface model and non-dominated sorting genetic algorithm-Ⅱ is used to carry out the multi-objective optimization design of rectangular built-in pantograph cabin structure.After 320 optimization iterative compuations,a series of Pareto optimization results are obtained.The results show that the optimized model can reduce the pantograph aerodynamic drag up to 5.9%and reduce the pantograph aerodynamic lift up to 2.4%.Compared with original model,as the inclination angle of pantograph cabin increases,the remaining design variables change a little.It indicates that during the high-speed train operation,the larger the inclination angle of pantograph cabin is,the more beneficial it is to improve the aerodynamic drag and lift performance of pantograph position.