New alleviation method of low frequency noise from a high-speed train tunnel with a porous and elastic plates

为了实现波浪模拟器，研制了一种快速开启闸阀。在模拟机上较好地再现了压力波的形成过程。通过数值和实验研究了多孔壁和空腔空间对超频噪声的影响。对压力波在具有不同孔壁和孔洞的波模拟器中传播时的衰减和畸变进行了数值分析。该方法计算的管内压力波波形在考虑管壁流体摩擦和有碴轨道影响的情况下，与实验数据吻合较好，表明本文的数值计算方法是合理的。实验数据表明了该方法的可行性，隔墙板和空腔空间的影响是明显的。找到了多孔板的最佳位置，阐明了多孔板在管内的作用。

To accomplish the wave simulator, a fast opening gate valve was developed. The formation of the pressure wave in a simulator are reproduced with a good quality.The effects of porous wall and cavity space for super frequency noise are investigated numerically and experimentally. The numerical analysis was developed on the attenuation and distortion of a pressure wave propagating in a wave simulator with various porous wall and cavity.The waveform of the pressure wave in the tube calculated by the present method, taking both fluid friction on the wall and the effect of the ballasted track into account, is in good agreement with the experimental data, so that the present numerical method of calculation seems to be reasonable.Experimental data shows the possibility of the present alleviative method, and the effects of the partition plates and cavity space are clear. Optimum location of porous plate are found and the effect of patition plate in a tube have been clarifed.