The effect of the flow on the absorption performance of sound absorption panel

Passengers in subway train are exposed to a worse noise environment when they are in the tunnel than in the open field. There are many ways to noise reduction techniques in the tunnel, but as an alternative it has been reported to attach sound absorption material on tunnel wall. For this reason sound absorption material for application of tunnel has been studied. But sound absorbing material has not been reported that the sound absorption performance are influenced by high speed flow occurred at subway train in the tunnel. In this study, the effect of the flow on absorption performance of the sound absorption panel is experimentally investigated and discussed.