Comparison of Johnson Champoux Allard and size distribution model for characterisation of rigid frame porous materials

This study evaluates the performance of a number of inversion methods on porous samples. A comparative investigation is performed using deterministic characterisation methods for macroscopically homogeneous rigid frame porous media from sound impedance tube measurement data, including Johnson-Champoux-Allard model. Several porous samples with different thicknesses and pore properties are tested. Acoustic impedance of the samples are retrieved using the inversion methods. Input parameters to the models include porosity, tortuosity, flow resistivity, viscous and thermal characteristic lengths, and mean pore size which are extracted using literature. The compared errors are shown and discussed to demonstrate the performance of each model corresponding to the type of material porosity.