徐志胜,韩 鹏
(中铁二院工程集团有限责任公司环境工程研究院成都 610031)
摘 要:首先,采用Cadna/A噪声预测软件,对某越江公路与轨道交通双层桥特定区段沿线噪声进行了模拟计算,获得沿线敏感建筑室外噪声超标的结论;接着针对设计提出的原声屏障方案,通过Cadna/A计算分析,认为原方案不能达到降噪目标的要求;最后,在声源识别的基础上,结合降噪目标的需要,提出新的优化方案,通过计算确认新的方案可以满足降噪目标的要求。
关键词:声学设计;声屏障; Cadna/A软件,噪声。
中图分类号:X593;U24;U44 文献标识码:A
Computer Aided Acoustics Design of Noise Barrier on Road and Rail Double Deck Bridge with Cadna/A
Xu Zhisheng,Han peng
(China Railway Eryuan Engineering Group Co. Ltd, Environmental Engineering Research Institute, Chengdu 610031, China)
Abstract: Noise impact, along a certain section of road & rail transit double deck bridge crossing a river, was simulated with software called Cadna/A. It reveals that outside noise of the receiver were beyond the limits standards. Then, effect of a noise reduction plan by noise barriers was calculated, and it was proved that the plan was not able to meet the needs of the noise reduction. Finally, A new plan was given on the basis of noise reorganizations and aims of noise reduction. The effect of the new plan was confirmed by Cadna/A calculation.
Key words: acoustics design; Noise barrier; Cadna/A; Noise
Cadna/A 软件是一款环境噪声模拟软件,适用于公路、城市道路、铁路(含城市轨道交通、磁悬浮交通系统)、工业领域的环境噪声模拟,也用于声屏障优化设计[1-6]。本文采用Cdana/A软件,建立了某越江桥梁工程的公路与轨道交通双层桥的噪声计算模型,并针对不同声屏障措施方案进行了计算,获得满足降噪目标的声学设计方案。
1 Cadna/A的噪声预测模式简介
1.1 道路交通噪声预测模式
1.2 铁路噪声预测模式
1.3 声屏障效果计算原理
2 型降噪工程声学设计
2.1 工程与环境特征
2.2 降噪目标值确定
2.3 声屏障位置、长度的确定
2.4 声屏障型式与高度方案的优化设计
2.4.1 原方案
2.4.2 优化方案
3 结论
《基于Cadna/A软件的道路及轨道交通声屏障辅助声学设计》共计8页。