高速铁路隧道壁吸声材料降噪效果仿真分析

应用SYSNOISE软件建立列车-隧道-隧道内壁吸音板结构的二维边界元模型,研究隧道内壁吸声结构不同铺设方案下的降噪效果。根据高速铁路列车通过时隧道内壁吸声结构不同铺设面积、铺设位置等因素,分析其对列车通过时噪声的降噪效果,并综合考虑工程经济性等因素,计算4个较为典型的隧道内壁吸声结构的铺设方案。计算结果表明:在隧道内壁全部铺设吸声材料的情况下,铺设隧道吸声结构对隧道内声压级的降噪效果约为14.3dB。随着隧道内壁吸声材料铺设面积的增加,隧道内的降噪效果越好。在计算选取的4个方案中,内壁整体铺设方案降噪效果最佳,内壁部分铺设方案降噪效果最差,两者的组合方案降噪效果适中,实际工程应用中应综合各方面因素对降噪方案进行选取。

Simulation Analysis of Noise Reduction Effect of Sound-absorbing Material on High-speed Rail Tunnel Surface

A two-dimensional boundary element model for train,tunnel and sound-absorbing board structure on the tunnel surface is established with the software SYSNOIE to evaluate different design proposals' noise reduction effects in tunnel. In this research,noise reduction effects are calculated while a high-speed train is running through the tunnel with sound-absorbing material on the surface,and several influencing factors such as material area and location are taken into account. Four typical material installation proposals are designed and calculated. The results show that the installation of soundabsorbing material may reduce about 14. 3 dB if only the entire tunnel surface is covered with soundabsorbing material. The more the tunnel surface is covered with sound absorbing material,the better the noise reduction effect. Of the four typical installation proposals,the one with full coverage is the best in noise reduction,while the one with partial coverage the worst. The combination of the two shows the intermediate result. Design proposals shall be carefully selected for practical application with various factors considered.