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Graded and anisotropic porous materials for broadband and angular maximal acoustic absorption

Theo Cavalieri, Jean Boulvert, Gwénaël Gabard, Vicente Romero-Garcia, Marie Escouflaire, Josselin Regnard and Jean-Philippe Groby

Article (2020)

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Abstract

The design of graded and anisotropic materials has been of significant interest, especially for sound absorption purposes. Together with the rise of additive manufacturing techniques, new possibilities are emerging from engineered porous micro-structures. In this work, we present a theoretical and numerical study of graded and anisotropic porous materials, for optimal broadband and angular absorption. Through a parametric study, the effective acoustic and geometric parameters of homogenized anisotropic unit cells constitute a database in which the optimal anisotropic and graded material will be searched for. We develop an optimization technique based on the simplex method that is relying on this database. The concepts of average absorption and diffuse field absorption coefficients are introduced and used to maximize angular acoustic absorption. Numerical results present the optimized absorption of the designed anisotropic and graded porous materials for different acoustic targets. The designed materials have anisotropic and graded effective properties, which enhance its sound absorption capabilities. While the anisotropy largely enhances the diffuse field absorbing when optimized at a single frequency, graded properties appear to be crucial for optimal broadband diffuse field absorption.

Uncontrolled Keywords

anisotropic materials; optimized absorption; diffuse field; graded properties

Subjects: 2100 Mechanical engineering > 2100 Mechanical engineering
Department: Department of Mechanical Engineering
Research Center: LAVA - Laboratory for Acoustics and Vibration Analysis
Funders: ANR Chaire industrielle MACIA
Grant number: ANR-16-CHIN-0002
PolyPublie URL: https://publications.polymtl.ca/9402/
Journal Title: Materials (vol. 13, no. 20)
Publisher: MDPI
DOI: 10.3390/ma13204605
Official URL: https://doi.org/10.3390/ma13204605
Date Deposited: 16 Aug 2023 13:23
Last Modified: 09 Apr 2024 05:01
Cite in APA 7: Cavalieri, T., Boulvert, J., Gabard, G., Romero-Garcia, V., Escouflaire, M., Regnard, J., & Groby, J.-P. (2020). Graded and anisotropic porous materials for broadband and angular maximal acoustic absorption. Materials, 13(20), 19 pages. https://doi.org/10.3390/ma13204605

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