1. Modeling acoustic properties
1.1 Definition of geometric parameters
Porosity φ is the ratio of the pore volume V
p
occupied by air, to the total volume V
t
in a homogenization ball (a volume that contains a sufficient number of pores but remains small on a macroscopic scale) :
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Modeling acoustic properties
Metrology of the acoustic properties of absorbent materials
Appendix: equivalent fluid
The "effective density" and "effective modulus of compressibility" functions of the equivalent fluid must be suitably represented by the following approximate models:
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