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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. In order to improve the accuracy of traffic noise prediction, the real-time traffic flow at the roundabout is simulated dynamically by using the micro traffic simulation software, and the traffic noise at the roundabout is calculated by combining the noise emission model of a single vehicle and the propagation attenuation model. Among them, the noise emission model of a single vehicle is to measure the noise value of 3 372 vehicles with large, medium and small size under various running conditions of idling, constant speed, acceleration and deceleration, and then through regression analysis The method of getting. At the same time, the theoretical model is used to calculate the traffic noise at the roundabout and compared with the measured results at the roundabout. The results show that the proposed method has higher accuracy and applicability. The method is applied to the analysis of the noise of roundabouts under different traffic volumes. By comparing the average noise and noise distribution, some characteristics of traffic noise at roundabouts are obtained.