High speed-trains entering long tunnels sometimes cause an explosive sound at the exit, caused by a micro-pressure wave. Tunnel hoods have been installed to mitigate this phenomenon. In general, Shinkansen tunnel hoods have slit windows in their side wall. On one hand these side slit windows are effective for micro-pressure waves; but on the other hand, they cause traveling noise from trains to escape from tunnel hoods. To make matters worse, the faster trains travel, the louder traveling noise becomes. In this study, new noise reduction facilities for slit windows of tunnel hoods have been developed. The scale model experiments in this study proved the effectiveness in noise reduction.
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