A round robin test of the acoustical properties of porous media

There is a considerable number of research publications on the characterization of porous media that is carried out in accordance with the ISO 10534-2. However, the reproducibility of these characterization procedures is not well understood. This paper deals with the reproducibility of some standard characterization procedures for acoustic porous materials. One novelty of this paper is that independent laboratory measurements were performed on the same material specimens so that the naturally occurring inhomogeneity in materials was controlled. Another novelty of this work is that it presents the reproducibility data for the characteristic impedance, complex wavenumber and for some related pore structure properties. This work can be helpful to understand better the tolerances of these material characterization procedures so the improvements can be developed to reduce the experimental errors and improve the reproducibility between laboratories. ? 2017 Institute of Noise Control Engineering. All Rights Reserved.