Urban background noise mapping : the multiple-reflection correction term

M.C.J. Hornikx, J. Forssén, D. Botteldooren, T. Van Renterghem, W. Wei, M. Ogren, E. Salomons

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Abstract

Mapping of road traffic noise in urban areas according to standardized engineering calculation methods systematically results in an underestimation of noise levels at areas shielded from direct exposure to noise, such as inner yards. In most engineering methods, road traffic lanes are represented by point sources and noise levels are computed utilizing point-to-point propagation paths. For a better prediction of noise levels in shielded urban areas, an extension of engineering methods by an attenuation term Acan has been proposed, including multiple reflections of the urban environment both in the source and in the receiver area. The present work has two main contributions for the ease of computing Acan. Firstly, it is shown by numerical calculations that Acan may be divided into independent source and receiver environment terms, As and Ar. Based on an equivalent free field analogy, the distance dependence of these terms may moreover be expressed analytically. Secondly, an analytical expression is proposed to compute As and Ar for 3D configurations from using 2D configurations only. The expression includes dependence of the street width-to-height ratio, the difference in building heights and the percentage of façade openings in the horizontal plane. For the expression to be valid, the source should be separated from the receiver environment by at least four times the street width.
Original languageEnglish
Pages (from-to)293-305
Number of pages13
JournalActa Acustica united with Acustica
Volume100
Issue number2
DOIs
Publication statusPublished - 2014

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background noise
streets
receivers
engineering
roads
traffic
configurations
point sources
attenuation
propagation
predictions
Roads
Urban Areas
Traffic

Cite this

Hornikx, M. C. J., Forssén, J., Botteldooren, D., Van Renterghem, T., Wei, W., Ogren, M., & Salomons, E. (2014). Urban background noise mapping : the multiple-reflection correction term. Acta Acustica united with Acustica, 100(2), 293-305. https://doi.org/10.3813/AAA.918709
Hornikx, M.C.J. ; Forssén, J. ; Botteldooren, D. ; Van Renterghem, T. ; Wei, W. ; Ogren, M. ; Salomons, E. / Urban background noise mapping : the multiple-reflection correction term. In: Acta Acustica united with Acustica. 2014 ; Vol. 100, No. 2. pp. 293-305.
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abstract = "Mapping of road traffic noise in urban areas according to standardized engineering calculation methods systematically results in an underestimation of noise levels at areas shielded from direct exposure to noise, such as inner yards. In most engineering methods, road traffic lanes are represented by point sources and noise levels are computed utilizing point-to-point propagation paths. For a better prediction of noise levels in shielded urban areas, an extension of engineering methods by an attenuation term Acan has been proposed, including multiple reflections of the urban environment both in the source and in the receiver area. The present work has two main contributions for the ease of computing Acan. Firstly, it is shown by numerical calculations that Acan may be divided into independent source and receiver environment terms, As and Ar. Based on an equivalent free field analogy, the distance dependence of these terms may moreover be expressed analytically. Secondly, an analytical expression is proposed to compute As and Ar for 3D configurations from using 2D configurations only. The expression includes dependence of the street width-to-height ratio, the difference in building heights and the percentage of fa{\cc}ade openings in the horizontal plane. For the expression to be valid, the source should be separated from the receiver environment by at least four times the street width.",
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Hornikx, MCJ, Forssén, J, Botteldooren, D, Van Renterghem, T, Wei, W, Ogren, M & Salomons, E 2014, 'Urban background noise mapping : the multiple-reflection correction term', Acta Acustica united with Acustica, vol. 100, no. 2, pp. 293-305. https://doi.org/10.3813/AAA.918709

Urban background noise mapping : the multiple-reflection correction term. / Hornikx, M.C.J.; Forssén, J.; Botteldooren, D.; Van Renterghem, T.; Wei, W.; Ogren, M.; Salomons, E.

In: Acta Acustica united with Acustica, Vol. 100, No. 2, 2014, p. 293-305.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Hornikx, M.C.J.

AU - Forssén, J.

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AU - Wei, W.

AU - Ogren, M.

AU - Salomons, E.

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