Characteristics of a compression wave propagating over porous plate wall in a high-speed railway tun

• 作 者: T.Aoki J.Yamamoto K.Nagatani
• 机 构: Graduate School of Engineering Sciences,Kyushu University,
• 出 处: Journal of Thermal Science
• 发表日期: 2008年03期
• 关键词: tunnel railway porous propagating wavefront ahead entering clarify possibility a

A pressure wave is generated ahead of a high-speed train,while entering a tunnel.This pressure wave propagates to the tunnel exit and spouts as a micro-pressure wave,which causes an exploding sound.From the fact that the ballast track tunnel has smaller noise than the slab track tunnel,we have suggested a new inner tunnel model to decrease the noise of the micro-pressure wave,using the ballast effect.Experimental and numerical investigations are carried out to clarify the attenuation and distortion of propagating compression wave over porous plate wall in a model tunnel.Data shows that the strength of the compression wave and a maximum pressure gradient of the compression wave was weakened.These data shows the possibility of the present alleviative method using the porous plate wall in a tunnel.

A pressure wave is generated ahead of a high-speed train, while entering a tunnel. This pressure wave propagates to the tunnel exit and spouts as a micro-pressure wave, which causes an exploding sound. Flight the fact that the ballast track tunnel has smaller noise than the slab track tunnel, we have suggested a new inner tunnel model to decrease the noise of the micro-pressure wave, using the ballast effect. Experimental and numerical investigations are carried out to clarify the attenuation and distortion of propagating compression wave over porous plate wall in a model tunnel. Data shows that the strength of the compression wave and a maximum pressure gradient of the compression wave was weakened. These data shows the possibility of the present reviewing method using the porous plate wall in a tunnel.