等效道路线声源位置优化研究

Optimization of the equivalent position of road line-source

计算道路交通噪声时,一般将每个车道等效为1个线声源。有时,为了简化计算,将道路等效为1个线声源,等效线声源位置为道路中轴;或等效为2个线声源,等效线声源位置为道路两侧中心线或两侧最外车道中心线。本文推导了不同等效方法下观测点噪声的计算公式,并探讨了不同等效方法引起的误差。研究结果表明,将道路等效为2个线声源,等效线声源位置为道路两侧中心线的简化方法引起的误差最小。

Generally, each lane is treated as a line-source when calculating road traffic noise. However, in order to simplify calculation, the entire road may be equivalent to as one line-source located at centerline of the road, or equivalent to two line-sources located at centerline or centerline of outside lanes of each road side respectively. Different calculation formulae of sound pressure level at receiver points of those methods are deduced. Then, derived errors of those formulae are discussed. The results demonstrate that the simplification, which the entire road is treated as two line-sources located at centerline of each road side, has the smallest error than the other two methods.