美国从七十年代初起,已建造了250英里的道路声屏障。在平行声屏障之间的往复反射使插入损失下降。本文分析了各国文献并汲取有关现象和模拟的要点,希望对今后工作有所裨益,这方面有以下两类工作:(1)道路两旁有密集的高层建筑,而且声源和观察者均在其“峡谷”内的城市噪声传播;(2)平行道路声屏障,观察者在声源峡谷之外。本文将着重对后者进行详尽论述。 Since the early 1970s, the United States has built 250 miles of road noise barrier. Reciprocal reflections between parallel sound barriers reduce the insertion loss. This paper analyzes the national literature and draws on the main points of the phenomenon and simulation, hoping to benefit future work, there are two types of work in this regard: (1) dense high-rise buildings on both sides of the road, and the sound source and the observer are in it Urban noise transmission in “Canyon”; (2) Parallel road sound barrier, observer outside sound source canyon. This article will focus on the latter detailed discussion.