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Calculation of noise barrier performance using the substitute-sources method for a three-dimensional turbulent atmosphere

Jens Forssén (Institutionen för teknisk akustik)
Acta Acustica united with Acustica (1610-1928). Vol. 88 (2002), 2, p. 181-189.
[Artikel, refereegranskad vetenskaplig]

Substitute sources between a noise barrier and a receiver are used to calculate the effect of atmospheric turbulence on barrier sound reduction. The method is extended for application to three-dimensional situations with both high and low barriers. Calculations are made for a thin, hard screen, without the influence of a ground surface. The Kirchhoff approximation is applied for the low screens and a more accurate diffraction model is used for the higher screens. The calculated results are compared with corresponding ones for two-dimensional situations, by using the substitute-sources method (SSM) also. The two and three-dimensional calculations give very similar results, which indicates that, for a large variety of situations, only two-dimensional models are needed. The results are also compared with those obtained using a scattering cross-section method which, although it predicts a much weaker influence of turbulence than the SSM, shows mostly the same trend, namely that the turbulence influence is large only within a range of lower screen heights.



Denna post skapades 2006-11-10. Senast ändrad 2014-12-12.
CPL Pubid: 23208

 

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Institutioner (Chalmers)

Institutionen för teknisk akustik (1992-2004)

Ämnesområden

Akustik

Chalmers infrastruktur