고속열차의 주요 공력소음 발생 특성 분석에 관한 연구

초록

This study presents a result on simulation of sound radiation from a high-speed train. To analyze the generation of an environmental noise, the numerical simulations adopting the Lattice-Boltzmann method were performed for simplified shape of the train. The aerodynamic noise generation form the train nose, pantograph and intercoach spacing was computed. The simulation was performed for different slopes of a train nose, velocity of a flow, height of an under space, etc. The results were partially verified using the measured results from the wind test. The aerodynamic noise was generated as several tonal components from wake region caused by a train nose, vortex shedding from the pantograph, and flow feedback in the intercoach spacing. The proposed model can be utilized to optimize the train shape to reduce the noise.