期刊名称：Eastern-European Journal of Enterprise Technologies
印刷版ISSN：1729-3774
电子版ISSN：1729-4061
出版年度：2017
卷号：5
期号：5
页码：4-11
DOI：10.15587/1729-4061.2017.112350
语种：English
出版社：PC Technology Center
摘要：We stated and solved the problem on calculating a sound field around the noise protection screen with a slit at its base, through which noise penetrates. When solving this problem, we also took into consideration the presence of an acoustically rigid road surface in front of the screen and behind it. Such a statement of the problem makes it possible to assess effectiveness of the noise protection screens constructed not only on the horizontal sections of the terrain, but at higher elevations or on bridges. The proposed method implies splitting a field around the screen into canonical regions containing a solution to the wave equation. Then these regions are "sewn" by the values of velocity potential and its first derivative. Such an approach allows us to solve a problem on finding sound fields with a rather complex geometry.An analysis of the results showed the existence of a maximum in the efficiency of the screen, as well as allowed us to determine effect of the size of the opening in the screen on the reduction of noise behind the screen. At the width of the opening of up to 0.2 m, efficiency of the screen at a distance 30 m and further is reduced by no more than 0.5 dB. The given screen model could be applied to estimate effectiveness of the screen with finite soundproofing or to analyze noise reduction of the screens available in Ukraine.
关键词：noise protection screen;opening;effectiveness;partial areas method;finite element method;soundproofing
