Longitudinal type-line optimization of high-speed train for low aerodynamic noise  

作　　者：肖友刚 杨群 孙亮 时彧 

机构地区：[1]School of Traffic and Transportation Engineering,Central South University [2]College of Mechanical Engineering,Hunan University of Science and Technology

出　　处：《Journal of Central South University》2014年第6期2494-2500,共7页中南大学学报（英文版）

基　　金：Projects(50975289,51275531)supported by the National Natural Science Foundation of China;Project(201104514)supported by the Special China Postdoctoral Science Foundation,China;Project(20100471229)supported by China Postdoctoral Science Foundation

摘　　要：The basic head shape of high-speed train is determined by its longitudinal type-line(LTL),so it is crucial to optimize its aerodynamic performance.Based on the parametric modeling of LTL constructed by non-uniform relational B-spline(NURBS)and the fluctuation pressure obtained by large eddy simulation(LES),the Kriging surrogate model(KSM)of LTL was constructed for low aerodynamic noise,and the accuracy of the KSM was improved gradually by adding the sample point with maximum expected improvement(EI)and the optimal point from optimization.The optimal objective was searched with genetic algorithm(GA).The results show that the total fluctuation pressure level(FPL)of the optimal LTL can be 8.7 dB less than that of original one,and the shape optimization method is feasible for low aerodynamic noise design.The basic head shape of high-speed train is determined by its longitudinal type-line （LTL）, so it is crucial to optimize its aerodynamic performance. Based on the parametric modeling of LTL constructed by non-uniform relational B-spline （NURBS） and the fluctuation pressure obtained by large eddy simulation （LES）, the Kriging surrogate model （KSM） of LTL was constructed for low aerodynamic noise, and the accuracy of the KSM was improved gradually by adding the sample point with maximum expected improvement （EI） and the optimal point from optimization. The optimal objective was searched with genetic algorithm （GA）. The results show that the total fluctuation pressure level （FPL） of the optimal LTL can be 8.7 dB less than that of original one, and the shape optimization method is feasible for low aerodynamic noise design.

关 键 词：longitudinal type-line non-uniform relational B-spline （NURBS） aerodynamic noise fluctuation pressure level （FPL） shape optimization 

分 类 号：U270.16[机械工程—车辆工程]