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Master Thesis

Méthode de mesure in situ de la diffusion acoustique

Abstract : With the aim of defining a new in-situ method of diffusion measurement, two recently proposed methods of Jeon, Rindel and Kim have been investigated. The first one is based on the measurement of a mono-dimensional reverberation time between two parallel plates and gives an evaluation of a scattering coefficient. This field method has been tested through computer simulations and shows high sensitivity to experimental conditions, such as parallelism between the plates, edge effects and the presence of spherical sound waves. Simulations on MLS and hemispherical diffusors have proved to give interesting evolution trends of the scattering coefficient respectively to ISO 17497-1 coefficient. Finally the experimental set-up has been realised and laboratory measurements have been conducted: results were uneven and demonstrated the necessity of improving the protocol. The second method is focused at the scale of a concert hall, and proposes new parameters which could lead to a new global diffusivity index. It has been calculated on a simplified informatic model of the Boston Symphony Hall, with various diffusor arrangements. Measurements in real halls and a thorough investigation on the relationship between this index and the other parameters are still needed in order to define a normalized index. These two methods are complementary, and if further developed, could lead to efficient tools in evaluating and optimizing diffusion in real concert halls.
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https://dumas.ccsd.cnrs.fr/dumas-00517782
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Submitted on : Wednesday, September 15, 2010 - 2:40:09 PM
Last modification on : Friday, October 23, 2020 - 4:51:47 PM
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Brousse Nathalie. Méthode de mesure in situ de la diffusion acoustique. Acoustique [physics.class-ph]. 2009. ⟨dumas-00517782⟩

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