Enhancing sound attenuation in permeable heterogeneous materials via diffusion processes

Venegas, R; Boutin, C

Abstract

This paper illustrates the concept of inducing multiple local non-equilibrium pressure states in permeable rigid frame
materials by means of introducing specific geometrical patterns or material heterogeneities locally. This
results in enhanced sound attenuation that is mostly determined by the local non-equilibrium pressure states
of diffusive type. We illustrate the results by introducing analytical models for the long-wavelength acoustical
properties of i) a perforated porous matrix with concentric annular and cylindrical porous inclusions co-axially
inserted in the perforations, and ii) a heterogeneous array of highly resistive porous cylinders. The models predictions
are compared with numerical simulations showing good agreement.

Citation

Venegas, R., & Boutin, C. (2018). Enhancing sound attenuation in permeable heterogeneous materials via diffusion processes. Acta acustica united with Acustica, 104(4), 623-635. https://doi.org/10.3813/AAA.919202

• Journal Article Type: Article
• Acceptance Date: May 12, 2018
• Online Publication Date: Aug 31, 2018
• Publication Date: Aug 31, 2018
• Deposit Date: Mar 14, 2019
• Journal: Acta Acustica united with Acustica
• Print ISSN: 1610-1928
• Publisher: Hirzel Verlag
• Volume: 104
• Issue: 4
• Pages: 623-635
• DOI: https://doi.org/10.3813/AAA.919202
• Publisher URL: http://www.acta-acustica-united-with-acustica.com/