Journal of Mechanical Engineering >
Optimization Design on Key Structural Parameter of High Speed EMU Head-type Aerodynamic Shape
Online published: 2016-10-20
Reducing the running resistance and aerodynamic noise is the effective way to improve the operational speed and environment adaptability of high-speed EMU. Aiming at two targets including aerodynamic resistance and noise,an aerodynamic performance optimization design process for a new EMU head-type is established with Isight software,the steps of which including parameteric-driven modeling,mesh generation,aerodynamic calculation and optimization analysis automatically. Based on multi-objective genetic algorithm NSGA-II,a multi-objective integrated optimization design is completed for 3 key design variables including nose tip height,expansion amount of control points on the cowcatcher and inclination angle of bogie region baffle. Meanwhile,a correlation analysis is performed on aerodynamic resistance and aerodynamic noise with the 3 key design variables. Then the better aerodynamic shapes of the head were put forward. It can be seen through the calculation result that: ① the correlation of nose tip height of the head car with both resistance and maximum surface sound power level are positive; ② the influence of inclination angle of bogie region baffle on the resistance and maximum surface sound power of the head car is the most significant; ③ the maximum surface sound power level can be obviously reduced by optimizing the inclination angle of bogie region baffle.
Key words: resistance; noise; multi-objective optimization; high speed EMU
LI Ming , LIU Bin , ZHANG Liang . Optimization Design on Key Structural Parameter of High Speed EMU Head-type Aerodynamic Shape[J]. Journal of Mechanical Engineering, 2016 , 52(20) : 120 -125 . DOI: 10.3901/JME.2016.20.120
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