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Article Dans Une Revue Applied Acoustics Année : 2016

Design of metaporous supercells by genetic algorithm for absorption optimization on a wide frequency band

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Résumé

The optimization of acoustic absorption by metaporous materials made of complex unit cells with 2D resonant inclusions is realized using genetic algorithm. A nearly total absorption over a wide frequency band can be obtained for thin structures, even for frequencies below the quarter wavelength resonances i.e., in a sub-wavelength regime. The high absorption performances of this material are due to the interplay of usual visco-thermal losses, local resonances and trapped modes. The density of resonant and trapped modes in this dissipative porous layer, is a key parameter for broadband absorption. The best configurations and critical coupling conditions are found by genetic algorithm optimization. Several types of resonators are included gradually in the studied configurations (split-rings, Helmholtz resonators, back cavities) with increasing complexity. The optimization leads to a metaporous structure with a 2-cm sub-wavelength layer thickness, exhibiting a nearly total absorption between 1800 Hz and 7000 Hz. The influence of the incidence angle on the absorption properties is also shown.
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Dates et versions

hal-02511731 , version 1 (19-03-2020)

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Clément Lagarrigue, J.-P. Groby, Olivier Dazel, V. Tournat. Design of metaporous supercells by genetic algorithm for absorption optimization on a wide frequency band. Applied Acoustics, 2016, 102, pp.49-54. ⟨10.1016/j.apacoust.2015.09.011⟩. ⟨hal-02511731⟩
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