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Extending standard outdoor noise propagation models to complex geometries

Abstract : Noise engineering methods (e.g. ISO 9613-2 or CNOSSOS-EU) efficiently approximate sound levels from roads, railways, and industrial sources in cities. However, engineering methods are limited to only simple box-shaped geometries. This dissertation develops and validates a hybrid method to extend the engineering methods to more complicated geometries by introducing an extra attenuation term that represents the influence of a real object compared to a simplified object.Calculating the extra attenuation term requires reference calculations to quantify the difference between the complex and simplified objects. Since performing a reference computation for each path is too computationally expensive, the extra attenuation term is linearly interpolated from a data table containing the corrections for many source and receiver positions and frequencies. The 2.5D boundary element method produces the levels for the real complex geometry and a simplified geometry, and subtracting these levels yields the corrections in the table.This dissertation validates this hybrid method for a T-barrier with hard ground, soft ground, and buildings. All three cases demonstrate that the hybrid method is more accurate than standard engineering methods for complex cases.
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https://tel.archives-ouvertes.fr/tel-01834558
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Submitted on : Friday, July 13, 2018 - 10:51:30 AM
Last modification on : Tuesday, March 31, 2020 - 3:20:47 PM
Long-term archiving on: : Monday, October 15, 2018 - 11:08:05 PM

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2017LEMA1038.pdf
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  • HAL Id : tel-01834558, version 2

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Matthew Kamrath. Extending standard outdoor noise propagation models to complex geometries. Acoustics [physics.class-ph]. Université du Maine, 2017. English. ⟨NNT : 2017LEMA1038⟩. ⟨tel-01834558v2⟩

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