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When a high-speed train enters a tunnel, a compression wave is generated ahead of the train and propagates to the tunnel exit. This pressure wave emits from the exit of the tunnel as an impulsive wave... which makes a blast sound. The object of this paper is to show a passive way to reduce the level of the blast sound. The effects of annular boxes at the exit of a circular tube were investigated experimentally and numerically. As a result, relations between the size of the passive silencer and noise reduction rate have been clarified which suggests a suitable design factor for an exit annular box.show more
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