다목적 공력성능향상을 위한 고속열차 전두부 최적형상의 공력 특성 검토

It is well known that Aerodynamic performances of high speed train take major effects on high speed running. Nose shape optimization of high speed train is done for the improvement of aerodynamic characteristics. The objective functions are the reduction of the aerodynamic drag, the improvement of the side wind stability, and the reduction of the micro-pressure wave at tunnel exits and two stages optimization is progressed. After the optimization for the aerodynamic drag reduction is performed based on KTXSancheon train shape, multi-objective optimization is conducted for the improvement of side wind stability and the micro-pressure wave. As a results of study for aerodynamic characteristics of optimized shapes, change ratios through optimization are lower than those through numerical simulations.