抄録
When a compression wave generated by a train entering a tunnel propagates through the tunnel and arrives at the tunnel exit, a pressure pulse wave, so-called micro-pressure wave, is radiated from the tunnel exit. The effect of the hood installed at th4e tunnel exit to the radiated micro-pressure wave is studied in model experiments for 3 different exit conditions, without hood, with simple hood and hood with a window. The higher frequency component of the micro-pressure wave shows strong directivity towards the front direction. In addition, a prediction method for micro-pressure wave is developed using "compact" approximation. The predicted results show good agreement with the experimental value for the case without hood.
