内壁付きトンネル出口フードによる放射段階での微気圧波低減対策

概要

論文の詳細を見る
When a train enters a tunnel at high speed, an impulsive pressure wave, called a micro-pressure wave, is radiated from a tunnel exit portal. Because it is one of the important wayside environmental problems in high-speed railways, many studies about its countermeasures have been conducted. The principal countermeasure applied to the Shinkansen on the ground side is a tunnel entrance hood. The necessary length of the tunnel entrance hood increases with the increase of a train velocity, and some of them installed in recent years have over 40 m length. The reduction rate of micro-pressure wave by extending the hood length decreases in case the hood length is long. In this paper a new countermeasure to install a tunnel exit hood to reduce the micro-pressure wave has been proposed. While the tunnel entrance hood is installed at tunnel entrance portal, the tunnel exit hood is installed at tunnel exit portal from which the micro-pressure wave is radiated. The tunnel exit hood has an inside partition which divides the inside of the hood into two parts in the vicinity of its mouth with the end of one part closed. Its reduction rate of the micro-pressure wave has been estimated by an acoustic analysis and verified by model experiments.
一般社団法人日本機械学会の論文