环形交叉口交通噪声动态模拟及分析

Dynamic Simulation and Analysis of Traffic Noise at Roundabout

交通噪声预测是城市交通规划和环境管理的重要任务。为提高交通噪声预测的准确性,利用微观交通仿真软件对环形交叉口的实时交通流进行动态模拟,再结合单辆机动车的噪声排放模型以及传播衰减模型,计算得到环形交叉口的交通噪声。其中,单辆机动车的噪声排放模型是对3 372辆包含大、中、小型的单辆机动车在怠速、匀速、加速、减速等各种行驶状态下的噪声值进行测定,再通过回归分析的方法得到的。同时利用理论模型的方法对环形交叉口的交通噪声进行计算,并在环形交叉口实测进行对比,结果证明本方法具有更高的计算精度和适用性。将该方法应用于不同车流量下的环形交叉口噪声的分析,通过平均噪声及噪声分布情况等的对比,得到环形交叉口交通噪声的若干特点。

Traffic noise prediction is an important task of urban traffic planning and environmental management. To improve the accuracy of traffic noise prediction,traffic noise at roundabouts is calculated by using a microscopic traffic simulation software program combining with a noise emission model of a single vehicle and the propagation attenuation model. By testing the traffic noise source intensity of large,medium and small single vehicle in different operation statuses of idle speed,uniform velocity,acceleration and deceleration,the noise emission model of a single vehicle was obtained with the method of regression analysis based on 3 372 experimental data. And then the traffic noise at roundabout was calculated with the theoretical model method. It was proved that the dynamic simulation method has higher accuracy and applicability by comparing with the measured data of roundabout. Then this method was used to analyze the noise at roundabout under different traffic flows. Through the comparison of average noise values and noise distribution,several characteristics in traffic noise of roundabout were obtained.