Improving the accuracy of engineering models at shielded building facades: experimental analysis of turbulence scattering
conference paper
Noise mapping models are able to accurately predict directly exposed facade levels near busy roads on
condition that sufäciently detailed trafäc data is available. At the non-directly exposed side ofthe building,
howeve¡ common practice application of standard methods strongly underpredicts sound pressure levels,
potentially leading to an incorrect assessment of noise annoyance and sleep disturbance. The concept of
background noise mapping was proposed before, which has the important advantage that it can increase the
accuracy of existing noise maps at a limited computational cost. In this study, long-term meteorological and
noise data showed that turbulence scattering contributes significantly to the noise level at shielded facades,
already at sound frequencies below I kHz. Periods with strong atmospheric turbulence are dominant for
long-term equivalent noise levels as typically used in strategic noise maps. A comparison between
predictions and measurements show that rather high turbulence strengths should be used when producing
noise maps
condition that sufäciently detailed trafäc data is available. At the non-directly exposed side ofthe building,
howeve¡ common practice application of standard methods strongly underpredicts sound pressure levels,
potentially leading to an incorrect assessment of noise annoyance and sleep disturbance. The concept of
background noise mapping was proposed before, which has the important advantage that it can increase the
accuracy of existing noise maps at a limited computational cost. In this study, long-term meteorological and
noise data showed that turbulence scattering contributes significantly to the noise level at shielded facades,
already at sound frequencies below I kHz. Periods with strong atmospheric turbulence are dominant for
long-term equivalent noise levels as typically used in strategic noise maps. A comparison between
predictions and measurements show that rather high turbulence strengths should be used when producing
noise maps
TNO Identifier
480323
Source title
Noise control for quality of life. Internoise 2013, Innsbruck, Austria, 15-18 September 2013
Pages
1-5
Files
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