Three-dimensional aerodynamic optimization design of high-speed train nose based on GA-GRNN  

作　　者：YAO ShuanBao GUO DiLong YANG GuoWei 

机构地区：[1]Key Laboratory for Hydrodynamics and Ocean Engineering Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Science China(Technological Sciences)》2012年第11期3118-3130,共13页中国科学（技术科学英文版）

基　　金：supported by the National Basic Research Program of China ("973" Project) (Grant No. 2011CB711100);the National Hi-Tech Research and Development Program of China ("863" Project) (Grant No.2009BAQG12A03);Computing Facility for Computational Mechanics,Institute of Mechanics,Chinese Academy of Sciences

摘　　要：With the speed upgrade of the high-speed train,the aerodynamic drag becomes one of the key factors to restrain the train speed and energy saving.In order to reduce the aerodynamic drag of train head,a new parametric approach called local shape function(LSF) was adopted based on the free form surface deformation(FFD) method and a new efficient optimization method based on the response surface method(RSM) of GA-GRNN.The optimization results show that the parametric method can control the large deformation with a few design parameters,and can ensure the deformation zones smoothness and smooth transition of different deformation regions.With the same sample points for training,GA-GRNN performs better than GRNN to get the global optimal solution.As an example,the aerodynamic drag for a simplified shape with head + one carriage + tail train is reduced by 8.7%.The proposed optimization method is efficient for the engineering design of high-speed train.

关 键 词：aerodynamic drag GA-GRNN PARAMETRIC high-speed trains 

分 类 号：U292.914[交通运输工程—交通运输规划与管理] V224[交通运输工程—道路与铁道工程]