Institute of Technology, Shimizu Corporation, 3-4-17, Etchujima, Tokyo, 135-8530, Japan.
J Acoust Soc Am. 2012 Mar;131(3):2110-7. doi: 10.1121/1.3682052.
The performance of balconies with ceiling-mounted reflectors on a high-rise building façade is examined using numerical analyses and scale-model experiments. The reflectors are designed to reflect direct and diffracted waves incident on the ceiling outside the balcony. The sound pressure reduction, provided by the reflectors, on a window surface adjacent to the balcony is evaluated at intermediate floors levels. In terms of A-weighted sound pressure levels, a balcony equipped with reflectors reduces road traffic noise by 7-10 dB(A), compared to an ordinary balcony, at incident angles of noise close to the angle for which the reflectors are designed. The efficiency is roughly the same as, or greater than, that of a balcony with an absorbent ceiling. However, it is also shown that when the vertical incident angle of the noise is smaller than the design angle of the reflectors, or the horizontal incident angle is large, efficiency is reduced.
采用数值分析和缩尺模型实验研究了高层建筑物立面上带顶棚式反射器的阳台的性能。反射器的设计目的是反射落在阳台外顶棚上的直接波和绕射波。评估了在中间楼层水平位置上，反射器对毗邻阳台的窗户表面的声压降低效果。在 A 计权声压级方面，与普通阳台相比，装有反射器的阳台在接近反射器设计角度的噪声入射角下，可将道路交通噪声降低 7-10 dB(A)。其效率与带吸声顶棚的阳台大致相同，甚至更高。然而，研究还表明，当噪声的垂直入射角度小于反射器的设计角度，或者水平入射角度较大时，效率会降低。
