Perforated tunnel exit regions and micro-pressure waves: geometrical influence
Perforated tunnel exit regions and micro-pressure waves: geometrical influence
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DOI：
10.1680/jencm.15.00026
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发表时间：
2016-05
期刊：
影响因子：
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通讯作者：
Honglin Wang;A. Vardy;D. Pokrajac
中科院分区：
文献类型：
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作者：
Honglin Wang;A. Vardy;D. Pokrajac
长，穿孔出口区域在减少辐射的微压力波（MPW）从铁路隧道的有效性进行了评估。这样的扰动总是会发生，但它们的幅度通常很小。对于高速列车的特殊情况，如果没有适当的对策，它们可能会达到令人烦恼的水平。在长隧道的情况下，这种风险尤其大。波在穿孔出口区域的反射/透射/辐射的一般行为已经在以前的论文中进行了探索，这些论文已经（a）量化了从隧道中的更上游到达出口区域的入射波前的特性的依赖性，以及（B）以搜索的方式验证了数值方法。与长期以来已知的未穿孔出口区域的标准相比，已经发现了一些显著的差异。特别地，所得到的MPW振幅取决于入射波前的振幅以及它们的陡度。这一页...
The effectiveness of long, perforated exit regions in reducing the radiation of micro-pressure waves (MPWs) from railway tunnels is assessed. Such disturbances always occur, but their amplitudes are usually small. For the particular case of high-speed trains, they can reach levels that would cause annoyance in the absence of suitable countermeasures. This risk is especially large in the case of long tunnels. The general behaviour of wave reflection/transmission/radiation at a perforated exit region has been explored in previous papers that have (a) quantified the dependence on the characteristics of the incident wavefront reaching the exit region from further upstream in the tunnel and (b) validated the numerical methodology in a searching manner. Some notable differences have been found in comparison with the criteria that have long been known for unperforated exit regions. In particular, the resulting MPW amplitudes depend on the amplitudes of incident wavefronts as well as on their steepnesses. This pa...