Makarewicz Rufin, Kokowski Piotr
Institute of Acoustics, A. Mickiewicz University, 61-614 Poznan, Umultowska 85, Poland.
J Acoust Soc Am. 2007 Oct;122(4):2074-81. doi: 10.1121/1.2769972.
The effects of vehicle speed variation on road traffic noise are analyzed. The steady speed motion is replaced by deceleration, cruise, and acceleration. Because of a relatively loud acceleration noise, such a speed variation results not only in the noise decrease zones, but in the noise increase zones as well. The location of these zones depends slightly upon the ground covering (grass, concrete, etc.). Conversely, their boundaries change dramatically with the parameters describing noise emission during deceleration, cruise, and acceleration. For example, the Japanese and Polish models of noise emission have been applied. The critical length L() of the cruise segment of the road is introduced: for L>L() the sound energy decline (due to speed reduction) compensates the sound energy growth (due to acceleration). The results obtained could be useful for road administrators.
分析了车速变化对道路交通噪声的影响。将稳定速度运动替换为减速、巡航和加速。由于加速噪声相对较大，这种速度变化不仅会导致噪声降低区域，也会导致噪声增加区域。这些区域的位置在一定程度上取决于地面覆盖物（草地、混凝土等）。相反，它们的边界会随着描述减速、巡航和加速过程中噪声排放的参数而显著变化。例如，应用了日本和波兰的噪声排放模型。引入了道路巡航段的临界长度L()：当L>L()时，（由于速度降低导致的）声能下降补偿了（由于加速导致的）声能增长。所得结果可能对道路管理者有用。
