Parametric study of a metaporous made of solid inclusions embedded in a rigid frame porous materialReport as inadecuate




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* Corresponding author 1 LAUM - Laboratoire d-acoustique de l-université du Maine

Abstract : With the growing interest for sound absorbing materials, research is brought to optimize porous material whose acoustic absorption coefficient should to remain large across a broad frequency range. Embedding rigid inclusions in a porous plate can enhance its acoustical properties and create an efficient sound insulating material for low frequencies. The excitation of additional acoustic modes when periodic arrangements of inclusions are used can lead to enhanced acoustic energy dissipation due to the viscous and thermal effects in the material pores when the wavelength is comparable with the radius of the inclusions. By acting on the characteristics of individual cells periodicity, shape, type

., it is possible to combine absorption related to the medium with additional resonant effects at low frequencies. A parametric study is performed in order to determine the influence of the geometry, orientation and resonance frequency of infinitely rigid inclusions embedded in a porous plate. The behavior of these structured materials is computed by finite element method to determine the -optimal- inclusion in order to obtain an efficient absorbing material.

Keywords : porous sound absorbing metaporous





Author: Clément Lagarrigue - Olivier Dazel Jean-Philippe Groby - Vincent Tournat -

Source: https://hal.archives-ouvertes.fr/



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