临街建筑群中交通噪声的计算机模拟

COMPUTER SIMULATION OF TRAFFIC NOISE AMONG BUILDINGS ADJACENT TO STREET

给出了临街建筑群中纵深方向的交通噪声计算机模拟预测方法.交通干道上车流采用泊松分布和等车距车流相结合模型,考虑多种车型的不同声功率级.每辆车作为一个点声源,以几何声学方法考虑直达声和有限次反射声对测点的影响.在计算程序中只要输入车流量、车流成份,建筑群中有关巷道宽度,测点在巷子纵深方向距离及背景噪声等数据,计算机便能迅速输出L_(10)、L_(50)、L_(98)、L_(eq)等声级值.模拟结果和实测值基本一致.

A computer simulation model for traffic noise assessment at observing points among buildings adjacent to street is given in this paper. The traffic flow is supposed on model combined by Poisson distribution and equal interval. Each vehicle is considered as a point-source. The various kinds of vehicle sound-power-levels are considered. Direct and reflected sound rays of limited orders are considered by geometrical acoustics. The statistical noise levels such as L10,L50 and Leq will output immediately as the data of traffic volume, traffic component, wideness of lanes among buildings and distances between observer and entrances to the lanes are inputed. The simulated data agree with observed data well.