A model of sound scattering by atmospheric turbulence for use in noise mapping calculations

Sound scattering due to atmospheric turbulence limits the noise reduction in shielded areas. An engineering model is presented, aimed to predict the scattered level for general noise mapping purposes including sound propagation between urban canyons. Energy based single scattering for homogeneous and isotropic turbulence following the Kolmogorov model is assumed as a starting point and a saturation based on the von Kármán model is used as a first-order multiple scattering approximation. For a single shielding obstacle the scattering model is used to calculate a large dataset as function of the effective height of the shielding obstacle and its distances to source and receiver. A parameterisation of the dataset is used when calculating the influence of single or double canyons, including standardised air attenuation rates as well as façade absorption and Fresnel weighting of the multiple façade reflections. Assuming a single point source, an aver aging over three receiver positions and that each ground reflection causes energy doubling, the final engineering model is formulated as a scattered level for a shielding building without canyon plus a correction term for the effect of a single or a double canyon, assuming a flat rooftop of the shielding building. Input parameters are, in addition to geometry and sound frequency, the strengths of velocity and temperature turbulence.

Hornikx, MaartenEindhoven University of Technology (författare)
Botteldooren, DickGhent University (författare)
Wei, WeigangGhent University (författare)
Van Renterghem, TimothyGhent University (författare)
Ögren, MikaelStatens väg- och transportforskningsinstitut,Miljö och trafikanalys, MTA(Swepub:vti)mikael.ogren@vti.se (författare)
Chalmers Tekniska HögskolaEindhoven University of Technology (creator_code:org_t)

Ingår i:Acta Acoustica united with Acustica: S. Hirzel Verlag100:5, s. 810-8151610-19281861-9959

Av författaren/redakt...: Forssén, Jens; Hornikx, Maarten; Botteldooren, Di ...; Wei, Weigang; Van Renterghem, ...; Ögren, Mikael

Om ämnet

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Maskinteknik; och Strömningsmekani ...

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