|発明の名称||METHOD AND DEVICE FOR REDUCING LOW-FREQUENCY SOUND|
PROBLEM TO BE SOLVED: To provide a method and a device for reducing low frequency sound (micro-pressure wave) from galleries while securing sufficient areas of pit mouthes for ventilation and evacuation.
SOLUTION: This low-frequency sound reducing device is formed in a tunnel 1 having galleries 2, comprises partition walls 3 for partitioning their respective galleries 2 into parts between the mouthes of their respective galleries 2 and the positions apart therefrom and walls 4 for closing a part of the divided galleries. Each gallery 2 is divided into open galleries 5 and closed galleries 6. Therefore, the energy of the pressure wave transferred to each gallery 2 is divided. The magnitude of the micro pressure wave emitted when the pressure wave is reflected from the open end in the open gallery 5 is smaller than in the case when the energy is not divided. When the pressure wave is advanced through the closed gallery 6 and the open gallery 5 while propagating and reflecting, the micro pressure wave occurs twice. However, their magnitudes are smaller than in the case when they are not divided.
- 公益財団法人鉄道総合技術研究所 情報管理部 知的財産担当
- URL: http://www.rtri.or.jp/index_J.html
- Address: 〒185-8540 東京都国分寺市光町２－８－３８
- TEL: 042-573-7220
- FAX: 042-573-7357