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Theses

Caractérisation acoustique des parois épaisses périodiques dans les locaux industriels

Abstract : Facings in industrial rooms can have periodic profiles. Various methods for the acoustic characterization of those kind of facings are presented in tbis work. The waveguides method, is web adapted to the geometries usually met in industrial rooms. According to tbis method, the profile geometry is simplified using elementary rectangular volumes. The acoustic field in the profile interstices can then be expressed as the superposition of waveguide modes. Numerical simulations of the waveguides method were realized, and physical phenomena associated with the sound reflection on periodic facings were observed. The waveguides method was also numerically compared with other existing methods. A generalization of tbis method have been proposed to extend its applicability to "twice-periodic" facings. Free field measurements were also carried out. The agreement between numerical and experimental results proves that the waveguides method is valid. Tbis method showed that periodic structures act as acoustic diffusers and that they may also amplify their materials' absorption.
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Theses
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http://docnum.univ-lorraine.fr/prive/SCD_T_2006_0125_BOS.pdf
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https://hal.univ-lorraine.fr/tel-01746969
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Submitted on : Thursday, March 29, 2018 - 10:48:45 AM
Last modification on : Tuesday, March 10, 2020 - 2:10:11 PM

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  • HAL Id : tel-01746969, version 1

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Lionel Bos. Caractérisation acoustique des parois épaisses périodiques dans les locaux industriels. Autre. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10125⟩. ⟨tel-01746969⟩

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