Calculation Methodology of Geometrical Dimensions for Noise-Protective Automotive Screens

To determine the projected screen’s optimal dimensions has been proposed a calculation method allowing assay an automotive noise entering the area, protected by this screen. In engineering calculations the noise screen is often considered as infinitely extended, so that the sound diffraction on its side edges and the noise from the parts which are not covered by the screen are ignored. The proposed complex approach in the screens design allows assay the levels of noise emanating from the parts of transport stream, covered and uncovered by the screen. Thus, the designer, in case of exceeding the set values by the noise level, can estimate from where the loudest noise comes: from the top of the screen or from its sides, including the noise from the road traffic parts which are not covered by the screen, both from the right and left sides of it. From here is emerged the possibility to rationally vary the screen’s geometric dimensions, increasing its height, or extending it in one or another direction. As a result of such design, the screen’s optimal basic geometrical dimensions are determined in terms of providing the necessary noise level in the protected area. This allows reduce the design time and economic costs for the construction of screens.