Numerical Study of Impulse Wave Characteristics for a High Speed Train-Tunnel Exit Topography

초록

As a high-speed train enters a tunnel, an impulse wave with impulsive noise is generated at the tunnel exit on the opposite side. This intermittent impulse wave caused new noise pollution in the villages around the tunnel exit. In order to solve this engineering problem, most of the countries around the world that have adopted high-speed trains are trying to reduce the magnitude of impulse waves by controlling the compression waves. In this study, numerical analysis was carried out to investigate the three-dimensional radiation pattern of impulse waves emitted from the tunnel exit when the train speed increases in the given topography conditions at the tunnel exit. When the topography near the tunnel exit has a plane inclined to the periphery of the railroad track than the flat ground, the impulse wave radiated from the tunnel exit has a strong sound directivity. This study provides basic data for the soundproofing measures of the villages around the tunnel exit.