造型设计阶段汽车气动特性优化  

Aerodynamic Characteristics Optimization during Modeling Design for Car

作　　者：李伟平[1] 肖娟[1] 张宝珍[1] 牛晓佩[1] 

机构地区：[1]湖南大学汽车车身先进制造国家重点实验室,长沙410082

出　　处：《机械科学与技术》2016年第8期1247-1252,共6页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家高技术研究发展计划(863计划)项目(2012AA111802)资助

摘　　要：考虑到在汽车工程设计阶段优化气动性能的复杂性,本文选择在造型设计阶段对其进行气动性能优化。首先以整车模型中面云图验证二维纵向对称面模型CFD仿真分析的有效性,建立车身纵向对称面参数化模型。然后选取对仿真结果影响显著的结构参数作为设计变量,通过CFD计算得出单个变量以及耦合变量对轿车气动特性的影响规律,利用基于薄板样条插值函数的高维模型构建设计变量与目标函数之间的近似模型。最后,基于近似模型进行多目标优化,并依此建立造型设计阶段轿车气动特性优化参考数据库。Considering the complexity of aerodynamic optimization for car during modeling design,we choose optimization of aerodynamic Characteristics for car. To verify the availability of Computational Fluid Dynamics（ CFD） in two-dimension longitudinal symmetry plane model by comparing with surface cloud of three-dimension car model firstly. A parameterized longitudinal symmetry plane model is established. Then the ignificant parameters are selected as the design variables,the CFD calculation reflects the effect of the single structure parameters and coupling parameters on the car aerodynamic characteristics. High Dimensional Model Representation between the design variables and the objective functions is constructed based on the Thin Plate Spline Interpolation（ TPSHDMR）. Moreover,multi-objective optimization method is applied in approximation model. Finally,a car reference database based on the results is established.

关 键 词：轿车 气动性能 高维模型 多目标优化 

分 类 号：U461.1[机械工程—车辆工程]