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Thick barrier noise-reduction in the presence of atmospheric turbulence: Measurements and numerical modelling

Jens Forssén (Institutionen för teknisk akustik) ; Mikael Ögren (Institutionen för teknisk akustik)
Applied Acoustics (0003-682X). Vol. 63 (2002), 2, p. 173-187.
[Artikel, refereegranskad vetenskaplig]

Atmospheric turbulence causes scattering of sound, which can reduce the performance of sound barriers. This is an important inclusion in prediction models to obtain a correct picture of the sound reduction at higher frequencies. Here a prediction method is applied that uses the strengths of the wind and temperature turbulence to estimate the scattered power into the shadow zone of a barrier. The predictions are compared to full-scale measurements on a thick barrier, where both acoustic and meteorological data were recorded simultaneously under both calm and windy conditions. Comparison between the measurements and the predictions indicate that the method gives reasonably accurate results for mid to high frequencies and a slight overestimation at very high frequencies.



Denna post skapades 2006-11-10. Senast ändrad 2014-12-12.
CPL Pubid: 23206

 

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Institutioner (Chalmers)

Institutionen för teknisk akustik (1992-2004)

Ämnesområden

Akustik

Chalmers infrastruktur