An index of heterogeneity of sound absorbing porous materials

Authors

  • Yacoubou Salissou GAUS, Department of Mechanical Engineering, Université de Sherbrooke, Qué. J1K 2R1, Canada
  • Raymond Panneton GAUS, Department of Mechanical Engineering, Université de Sherbrooke, Qué. J1K 2R1, Canada

Keywords:

Absorption, Acoustic impedance, Acoustic waves, Standards, Average relative standard deviation (ARSD), Heterogeneity, Inverted configurations

Abstract

An Index of heterogeneity, through-thickness homogeneity (TTH), of sound absorbing porous materials is calculated. The calculation of this TTH index only requires impedance tube measurements of the acoustical surface impedance on both faces of the tested material. A two-layer rigid frame porous system representing a single porous layer with a sudden change in its physical properties is studied to verify the validity of this TTH index. The sound absorption coefficient, complex wave number, and characteristic impedance of this equivalent single layer are computed in the normal and inverted positions. The heterogeneity of a material can be quantified by the average relative standard deviation (ARSD) of a bulk property measured respectively in both normal and inverted configurations. The ARSD of the three latter bulk properties are computed to identify the most sensitive bulk property to TTH.

Published

2007-09-01

How to Cite

1.
Salissou Y, Panneton R. An index of heterogeneity of sound absorbing porous materials. Canadian Acoustics [Internet]. 2007Sep.1 [cited 2021Apr.12];35(3):196-7. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1966

Issue

Section

Proceedings of the Acoustics Week in Canada

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