Measurement of the pressure waves generated in a high-speed train-tunnel model

초록

When a high-speed train approaches a tunnel, a compression wave is formed in the tunnel entry. The compression wave propagates in the tunnel at a sonic speed. When it reaches the tunnel exit, the part of it is emitted as an impulse wave to the outside and the remainder is reflected into the tunnel as an expansion wave. The impulse wave emitted from the exit generates explosive noise and low frequency vibration, and causes serious environmental problems such as affecting the crack of private houses and buildings around the tunnel. In order to solve these problems, it is important to measure the pressure waves generated in the tunnel. In this study, a test bed for the train-tunnel system is constructed, and the characteristics of the compression wave propagating in the tunnel are investigated. As the results, the pressure rise due to the compression wave in the tunnel increased in proportion to the train speed."