고속 전철에 의한 터널 출구에서의 충격성 소음(소닉붐)의 예측 및 실험적 연구

Measurement and prediction of sonic boom by high speed train at the tunnel exit

When a high-speed train enters a tunnel, a compression wave is generated ahead of the train and propagates along the tunnel. This wave subsequently emerges form the exit portal of the tunnel, which causes an impulsive noise. In the present study, experimental investigation is carried out on the sonic boom noise with parameters of train speed, blockage ratio, nose shape of train and airshaft. These experimental results show that several countermeasures could be used to efficiently reduce the sonic boom. In addition, numerical analysis is performed to predict the sonic boom. The predicted sound waves are in a good agreement with the experimental results.