摘要
车辆通过缓速脊时,因行驶状态发生变化而引起车辆噪声的变化。车辆在接近缓速脊的减速阶段噪声降低,在通过缓速脊后的加速阶段噪声增加,缓速脊对轻型车噪声的影响可用声源辐射能量的线性密度S加以评估。车辆和缓速脊间瞬时距离为x,要确定函数S(x),对于每辆车需要5个声曝级的测量值。本文假定每辆车为无方向点声源,产生的噪声在传播过程中无垂直于表面的反射,并基于此给出轻型车声曝级的测算方法。
A speed bump reduces traffic noise levels during the deceleration phase and increases them during the cars go through a speed bump.The net effect of a speed bump on noise from a fight vehicle is assessed by means of the concept of noise energy density,S.This is a function of the instantaneous distance between the vehicle and the bump,S（x）. To determine the function S（x） explicitly, five measurements of the sound exposure level, for each vehicle, are needed. It is assumed that the noise from each vehicle is generated by a single non-directional point source and propagates without vertical-surface reflections. An example prediction is presented based on measurements of sound exposure levels due to passenger cars.
出处
《道路交通与安全》
2007年第6期42-45,共4页
Road Traffic & Safety
关键词
道路交通噪声
中断的交通流
缓速脊
road traffic noise
interrupted traffic flow speed bump
