Abstract
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.
Highlights
More and more attention has been recently paid to protection against noise in the world [1]
Official normative documents point to the necessity of applying noise protection screens as an effective way to reducing the noise of traffic flows
Laboratory studies were later conducted into effectiveness of noise protection screens for point sources of sound with the obtained approximate expressions for assessing efficiency taking into consideration reflection of sound from the surface of the Earth [11, 12]
Summary
More and more attention has been recently paid to protection against noise in the world [1]. One of the most effective ways of reducing noise is to set noise protection screens. At present, leading countries of the world pay great attention to the construction of new, and the reconstruction of existing, highways, in order to increase intensity of transportation and improve safety of operation. Official normative documents point to the necessity of applying noise protection screens as an effective way to reducing the noise of traffic flows. That is why qualitative assessment of the effectiveness of noise protection screens, depending on their design parameters, as well improving their efficiency, is an extremely important and relevant task
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