Passive alleviation of micro-pressure waves from tunnel portals
Passive alleviation of micro-pressure waves from tunnel portals
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DOI：
10.1006/jsvi.1998.2006
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发表时间：
1999-03
影响因子：
4.7
通讯作者：
T. Aoki;A. Vardy;Jim Brown
中科院分区：
文献类型：
--
作者：
T. Aoki;A. Vardy;Jim Brown
摘要高速列车进入隧道时产生的压缩波在列车前方沿隧道沿着传播。一小部分波随后从隧道的出口处作为脉冲波出现。这种所谓的微压波通过低频噪音和周围区域的振动引起烦恼。本文的目的是确定在隧道出口门膨胀室的最佳尺寸，以减少微压力波的目的。膨胀室的影响进行了研究数值和实验。最佳比例的一个正确的圆柱形腔室被发现，并获得一个明确的关系之间的总体积和微压力波的衰减程度。
Abstract When a high-speed train enters a tunnel, it generates a compression wave which propagates along the tunnel ahead of the train. A small proportion of the wave subsequently emerges from the exit portal of the tunnel as an impulsive wave. This so-calledmicro-pressure wavecauses annoyance through low frequency noise and vibrations in the surrounding area. The objective of this paper is to determine the optimum dimensions of an expansion chamber at the tunnel exit portal for the purpose of reducing the micro-pressure wave. The effects of expansion chambers are investigated numerically and experimentally. Optimum proportions of a right-cylindrical chamber are found and a clear relationship is obtained between the total volume and the degree of attenuation of the micro-pressure wave.