摘要
测试列车通过一重载铁路路基区段时声屏障的插入损失值,分析不同牵引质量(5 000,8 000,12 000 t)和不同试验列车速度(60~100 km/h)3种声屏障的降噪效果和插入损失的频域特性。对首次在重载铁路中应用顶端降噪技术的干涉型声屏障的降噪效果进行了测试与分析。结果表明:声屏障的插入损失随列车速度的增加总体上呈减小的趋势;高声屏障高度由3.0 m增加至4.5 m,插入损失增加4.0 d B(A)以上;声屏障加装顶端降噪器,插入损失增加2.0 d B(A)以上;声屏障顶端降噪器对中低频噪声降噪效果显著,可有效提高声屏障工程总体降噪效果。
The acoustic insert loss of sound barriers was tested while train passing through a subgrade section of a heavy haul railway.Based on noise data under different traction load mass( 5 000,8 000,12 000 t) and different train speed( 60~100 km/h),noise-reducing effects and acoustic insert loss frequent characteristics of 3 types of sound barriers were analyzed.The noise-reducing effect of interferometric sound barriers using top noise-reducing technique and firstly used on heavy haul railway was tested and analyzed.The results showthat acoustic insert loss of sound barriers generally decreases with the increase of train speed.When sound barrier height increases from 3. 0 m to 4. 5 m,a coustic insert loss increases more than 4. 5 dB( A).Top noise-reducing device of sound barriers increases acoustic insert loss more than 2. 0 dB( A). Top noise-reducing device of sound barriers can significantly reduce middle and lowfrequency noise, so effectively improve the overall noise-reducing effect.
出处
《铁道建筑》
北大核心
2017年第10期139-141,共3页
Railway Engineering
基金
中国铁路总公司科技研究开发计划(2015G009-A)
关键词
重载铁路
声屏障
顶端降噪器
降噪效果
测试与分析
插入损失
Heavy haul railway
Sound barrier
Top noise-reducing device
Test and analysis
Acoustic insert loss
作者简介
邢星（1983-）,男,助理研究员,硕士.E-mail：lucasx11@163.com
