交通噪声对临街建筑影响的计算机模拟

本文根据几何声学的原理,利用直达声与重要的前次反射声声能叠加的办法考虑了交通噪声在城市高层建筑环境中的声能抑制效应,将多车道多车种随机车流噪声的计算机模拟方法进一步应用到道路两旁具有基本连续平行立面的高层建筑环境中,对高层建筑各层的户外噪声级作出预报。文中推导了根据建筑立面到车道的距离与建筑高度来决定所必须考虑的重要前次反射声次数的公式以及相应的反射声声线长度的公式。对于建筑立面垂直于道路的建筑环境,本文提出虚受声点的概念,建议利用比例作图法与计算机模拟相结合的预报程序,并给出了模拟预报的实例。

COMPUTER SIMULATION METHODS FOR PREDICTING THE EFFECTS OF MOTOR VEHICLE NOISE ON BUILDINGS ADJACENT TO URBAN STREETS

based on the principles of geometrical acousties and the superposition of important early reflected sound energy on direct sound energy, a computer model which considers the containment effects associated with basically unbroken facades paraller and adjacent to a street is given in this paper. The formulae deciding the orders of important early reflected sound rays which are dependent on the heights of buildings and the distances between facades and lanes are derived. The formulae of the early reflected sound ray's length are also derived. This paper also gives another computer simulation method having the aid of scale map of street and nearby buildings which can be used for predicting the noise levels of penetration through a gap in between rows of houses perpendicular to the street.