Validation of 3-D poroelastic finite element from the impedance measurement of a vibrating foam sample
Keywords:Acoustic wave transmission, Elasticity, Finite element method, Mathematical models, Porous materials, Poroelasticity, Tortuosity
AbstractThe real 3-D motion of porous materials was validated by comparing it with skeleton motion and acoustic coupling. The impedance of a resonant porous sample in a duct with lateral air gap was measured. A quasistatic measurement method was used to investigate both isotropic and axisymmetrical viscoelastic skeletons. For the experiment, the porous sample and the boundary conditions are so chosen that one resonance of the skeleton can be observed in the frequency range of 50 Hz to 500 Hz. The use of isotropic law is efficient when mechanical parameters are related to the kind of deformation of the material.
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