On the use of a loudspeaker for measuring the viscoelastic properties of sound absorbing materials
Résumé
This paper investigates the feasibility to use an electrodynamic loudspeaker to determine viscoelastic properties of sound absorbing materials in the audible frequency range. The loudspeaker compresses the porous sample in a cavity and a measurement of its electrical impedance allows to determine the mechanical impedance of the sample: no additional sensors are required. Viscoelastic properties of the material are then estimated by inverting a 1D Biot model. The method is applied to two sound absorbing materials (glass wool and polymer foam). Results are in good agreement with classical compression quasistatic method.
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