基于数值仿真计算的高速铁路声屏障长度对插入损失的影响
Influence of High Speed Railway Noise Barrier Length on Insertion Loss Based on Numerical Simulation Calculation
常亮1
作者信息
- 1. 中国铁路设计集团有限公司,天津 300308
- 折叠
摘要
在当前高速铁路降噪措施中,声屏障最为普遍和有效,其中声屏障设置高度是主要设计参数,而声屏障设置长度和位置,则一般根据经验结合简单计算选取,声屏障长度及预测点位置对插入损失变化的影响考虑较少.根据Kurze点声源绕射声衰减理论推导有限长声屏障对列车线声源插入损失的理论算法,对比分析声屏障长度、高度变化对不同位置预测点声屏障插入损失的影响.研究结论如下:(1)随着声屏障长度增加,各预测点位置尤其声屏障两端附近,声屏障插入损失变大;(2)采取加高、延长声屏障措施对于插入损失值及空间分布影响不同,应根据预测点位置情况合理选择声屏障优化措施;(3)半无限长声屏障端部加长50m后,插入损失变化量较为明显的区域位于声屏障端部水平距离 110m、与线路中心线距离130m范围内.
Abstract
Noise barriers are currently the most common and effective noise reduction measure for high speed railway.The height of noise barriers is the main design parameter,while the length and position of noise barriers are generally selected according to experience in combination with simple calculation.The influence of noise barrier length and prediction point position on insertion loss change is less considered.According to Kurze point sound source diffraction attenuation theory,the theoretical algorithm of finite length noise barriers on train line sound source insertion loss is derived,and the influences of noise barrier length and height changes on the insertion loss of noise barrier at different prediction points are compared and analyzed.The conclusions of the study are as follows:(1)With the increase of the length of the noise barrier,the insertion loss of noise barrier increases at the location of each prediction point,especially near both ends of the noise barrier;(2)Adopting the measures of heightening and extending the noise barrier has different effects on the insertion loss value and spatial distribution.Therefore,the noise barrier optimization measures shall be reasonably selected according to the position of the prediction points;(3)When the end of the semi-infinite length noise barrier is lengthened by 50m,the area with obvious variation in insertion loss is located within the range of 110m horizontal distance from the end of the noise barrier and 130m distance from the central lines of track.
关键词
高速铁路/声屏障/插入损失/点声源/绕射声衰减理论/数值仿真计算Key words
high speed railway/noise barrier/insertion loss/point sound source/diffraction attenuation theory/numerical simulation calculation引用本文复制引用
基金项目
中国铁路设计集团有限公司科技研发计划(2022BJH001)
出版年
2024
NETL
NSTL
万方数据