On the use of a loudspeaker for measuring the viscoelastic properties of sound absorbing materials.
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 one 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 the classical compression quasistatic method.
Doutres
Olivier
O
LAUM, CNRS, Universite du Maine, Le Mans, France. olivier.doutres@univ-lemans.fr
Dauchez
Nicolas
N
Génevaux
Jean-Michel
JM
Lemarquand
Guy
G
D000669:Amplifiers, Electronic; D003252:Construction Materials; D004548:Elasticity; D017097:Electric Impedance; D005240:Feasibility Studies; D005898:Glass; D008962:Models, Theoretical; D009622:Noise / Q000517:prevention & control*; D016062:Porosity; D015203:Reproducibility of Results; D013016:Sound; D055682:Viscoelastic Substances; D014783:Viscosity
D055682:Viscoelastic Substances