Semi-analytical characterisation of a homogeneous rigid frame porous material using P-P probes
Résumé
A new experimental set-up is presented for the characterisation of a homogeneous rigid frame porous material. Acoustical pressures are measured in front of and behind a porous plate using a P-P probe in an anechoic room. The equivalent density $\rho_{eq}(\omega)$ and bulk modulus $K_{eq}(\omega)$ of the porous medium are then analytically recovered from measurements. A numerical inversion procedure using the least square method allows us to obtain a good estimation of the five following acoustical parameters: the porosity $\phi$, the tortuosity $\alpha_\infty$, the flow resistivity $\sigma$, the viscous characteristic length $\Lambda$ and the thermal characteristic length $\Lambda'$.
Domaines
Acoustique [physics.class-ph]
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