Abstract
Characteristic features of evaluating the acoustic efficiency of sound screen on the ground were considered. To simplify the analysis, noise source and control point were located symmetrically on both sides of the screen. Their position was determined by the angle α and by the effective screen height. Influence of the α on the efficiency of a semi-infinite screen, and then on a decrease in this efficiency in the presence of the ground was analyzed.
Highlights
Automobile traffic appears to be the main source of noise in urban environment
It is possible to reduce the effect of this noise in residential areas either by improving acoustic characteristics of primarily the vehicles, which is a very difficult task [1-3], or by installing noise-protective screens along the roads
Considering the case, when the sound simultaneously from three sources S1, S2, and S3 gets to the control point, and taking into account (18) we obtain by analogy with (16), the following formula for the total screen efficiency:
Summary
Automobile traffic appears to be the main source of noise in urban environment. It is possible to reduce the effect of this noise in residential areas either by improving acoustic characteristics of primarily the vehicles, which is a very difficult task [1-3], or by installing noise-protective screens along the roads. Fresnel number is the basis of this formula, which, in addition to the sound wave length, takes into account the difference in the path of sound rays in the acoustic screen presence and absence. This approach to calculation is attractable by its simplicity, but has certain limitations, since it is valid only for a semi-infinite absolutely rigid screen. Characteristics both of the ground and of the screen material could not be taken into account in this situation Taking these factors into consideration in calculating with analytical methods is rather difficult; very often the effect on this surface on the result obtained is neglected in technical acoustics. This paper is using a simple analytical model to consider an screen located on the ground surface in order to study the influence of this surface on the screen efficiency
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