Scattering sound field prediction over periodic facing walls containing rectangular cavities
Résumé
The Institut National de Recherche et de Sécurité (INRS) is interested to reduce hearing risks in industrial workplaces by improving in situ noise conditions. INRS proposes appropriate solutions to improve the acoustic treatment of facings for noise control at workplace. This requires the development of theoretical and experimental methods of acoustic characterization of wall facings present in industrial rooms. These walls which possess periodic or aperiodic reliefs scatter sound waves. This work consists in developing a theoretical model to predict the acoustic pressure field reflected and scattered over a periodic facing containing parallel rectangular cavities. Originally, the model is based on a study of thick slits in electromagnetism. It has been adapted to study the acoustic behavior of a rectangular cavity by blocking the bottom of the slit. Then, the model has been generalized for several joint cavities by taking into account effects of coupling. It has been compared to FEM method and to experimental results obtained in a semi-anechoic room for a periodic facing containing three rectangular cavities insonified by an incident spherical acoustic field. The observed agreement between the numerical and experimental results supports the validity of our model on a wide spectral range.
Domaines
Acoustique [physics.class-ph]
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