双声源模式下高铁声屏障降噪效果仿真分析  

Simulation Analysis on the Noise Reduction Effect of High-speed Railway Sound Barrier

作　　者：吴小萍[1] 费广海 廖晨彦[1] 

机构地区：[1]中南大学,长沙410075

出　　处：《铁道工程学报》2015年第1期49-54,共6页Journal of Railway Engineering Society

基　　金：国家自然科学基金(51078361);湖南省交通科技项目(200743)

摘　　要：研究目的：高速铁路与普通铁路噪声源特性存在较大差异，按照传统方法计算设计的声屏障在高速铁路降噪应用中效果不理想。以武广客运专线某路基试验段为模型参照对象，基于高速铁路噪声源特性研究，建立双声源模式的高速铁路声屏障降噪模型，分别对不同声源模式下3m高直立型声屏障的降噪效果进行仿真分析。研究结论：（1）将仿真结果与实测结果进行对比，发现双声源模式的预测噪声级与实测值较为接近，而单声源模式的计算值明显小于实测结果和双声源模式的仿真结果，偏差达到8dBA左右；（2）单声源模式的噪声衰减计算结果达到10．7～13．1dBA，比实测结果显著偏高；（3）针对铁路限界处的噪声超过了规定的限值70dBA，提出了合理的声屏障优化设计方法以改善沿线的生态环境；（4）将弓网噪声单独考虑的双声源模式可为高速铁路声屏障的设计和应用提供可靠依据。Research purposes： The noise source between high -speed which hinders the sound barrier from working effectively in high railway and normal railway differs significantly, -speed railway. Based on the noise source characteristics of high - speed railway, with reference to one ground section of the Wuhan - Guangzhou high - speed railway, a dual - source mode to study the noise reduction effect of high - speed railway sound barrier was established. Under different source modes, simulation analysis on the noise reduction effect of 3 - meter vertical noise barrier was carried out. Research conclusions： Compared simulation results with measured results, the calculated sound pressure level of dual - source mode is closer to the measured one, while the result of single - source mode is lower, the deviation is 8 dBA. Under the single-source mode, the insertion loss of sound barrier is about 10. 7 dBA ~ 13. 1 dBA, which is significantly higher than the measured one. The noise of railway clearance is higher than 70 dBA, to improve the ecological environment of the railway line, many reasonable optimization methods of sound barrier were proposed. The dual- source mode which considered the pantograph -catenary noise can provide reliable reference for the design and application of high - speed railway sound barriers.

关 键 词：高速铁路 降噪效果 仿真分析 声屏障 噪声源 

分 类 号：U238[交通运输工程—道路与铁道工程] X593[环境科学与工程—环境工程]