平交路口交通噪声的测量分析与模型计算结果

本文给出了对有交通控制信号的十字型平交路口,交通噪声(以下简称路口噪声)的测量及统计分析结果。指出用统计声级L_50和L_90来衡量时,路口噪声比所谓自由车流噪声要高出3—7dB(A);而用L_10和等效声级L_eq的衡量时,两者几乎没有区别,虽然两者给人的感觉有所不同。通过与点声源路口噪声模型的计算结果对比,得出路口噪声统计声级L_50增高是因为两条道路相交,横路上车辆的运动噪声对总噪声能量的贡献。文中还讨论了路口噪声的统计分布和瞬时噪声级与交通控制信号之间的关系等问题。     

MEASUREMENT,ANALYSIS AND MODEL CALCULATION OF TRAFFIC NOISE NEAR THE BOAD INTERSECTIONS

Measured results and statistical analyses of traffic noise near the road intersections with traffic controlsignals are presented.It was found that the traffic noise near intersections is 3 to 7 dB(A)higher than the noiseof freely flowing road traffic in statistical noise levels L_(50) and L_(90),but no signifcant difference in L_(10) andequivalent continuous noise level L_(eq). The reason of higher L_(50) near intersections is considered to be due to the contribution to the total noiseenergy by the moving traffic in the crossing road,after comparing the neasured value of L_(50) with thecalculated result based on a simple source model of road intersections. The traffic noise level was not found to vary with the traffic signals.