Cadna/A软件与我国公路交通噪声预测模式在实际应用中的对比分析

Contrast analysis of Cadna/A software and noise predict mode of our national traffic noise in practical usage

Cadna/A软件作为国家环保总局环境工程评估中心推荐的噪声预测软件,已逐渐被环评领域的专家学者所接受.本文详细介绍了两种模式,分析了它们在声源修正、媒介对噪声衰减的作用以及车型划分上的异同点.通过实例模拟,对Cadna/A软件与我国公路交通噪声预测推荐模式(原交通部模式)预测公路噪声进行了对比,提出了Cadna/A软件在实际应用过程中将中型车全部并入大型车进行模拟计算更贴近于我国现有的公路交通噪声模式的处理方法,发现了两种模式预测交通噪声结果随距离衰减速率不一致的问题.

Cadna/A as the noise prediction software recommeded by the Environmental Engineering Center Environmental Protection Agency has been accepted by experts and scholars of environmental impact assessment. This paper describes its two models, while their similarities and differences are analyzed in sound source to amend, media on the role of noise attenuation and the similarities and differences in vehicle type classification. Simulation of Cadna/A software and our road traffic noise prediction model （the original model） forecast of road noise were compared. According the fact that in Cadna/A software application the simulation of all middle vehicles and large-scale ones in our country can be incorporated to be closer to the existing road traffic noise model a new method is put forward. And it is found that the traffic noise attenuation rate along with distance predicted by the two models.