行人过街信号控制路口交通噪声动态模拟与特性分析

Dynamic simulation and analysis of traffic noise at a signal-controlled pedestrian crossing

用实验方法测定了3种不同车型单辆车在参考距离处的噪声排放量及加减速噪声修正值.然后利用微观交通仿真软件为交通噪声的模拟提供实时的交通流数据,并结合车辆噪声排放量和传播衰减模型对行人过街信号控制路口交通噪声进行了动态模拟.最后将模拟结果与实测数据进行了比较分析,结果表明:等效声级Leq的预测误差小于2dB,统计声级L10和L90的预测误差小于3.5dB;行人过街路口附近Leq约下降2dB,路口下游的L90较上游低5dB左右,而噪声标准差和交通噪声指数则分别比上游高约1.5dB和15dB.

The single vehicle noise emission levels and acceleration adjustments for three types of vehicles at a reference distance are determined by measurement. Then by applying a microscopic traffic simulation software program to supply the real-time traffic flow,better integration with the vehicle noise emission levels and the noise propagation model,the dynamic traffic noise at a signal-controlled pedestrian crossing is simulated. Finally,the simulations and the measurements are compared,and the results show that：the prediction errors of Leq are less than 2 dB,and the prediction errors of L10 and L90 are less than 3.5 dB. The Leq is about 2 dB lower near the pedestrian crossing junction,and the L90 downstream from the junction is about 5 dB lower while the standard deviation of noise and the TNI are about 1.5 dB and 15 dB higher,compared with the ones upstream from the junction.