Doutres Olivier, Dauchez Nicolas, Génevaux Jean-Michel, Lemarquand Guy
LAUM, CNRS, Universite du Maine, Le Mans, France.
J Acoust Soc Am. 2008 Dec;124(6):EL335-40. doi: 10.1121/1.3008067.
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.
本文研究了使用电动扬声器在可听频率范围内测定吸声材料粘弹性特性的可行性。扬声器在一个腔体内压缩多孔样品，通过测量其电阻抗可以确定样品的机械阻抗：无需额外的传感器。然后通过对一维毕奥模型进行反演来估算材料的粘弹性特性。该方法应用于两种吸声材料（玻璃棉和聚合物泡沫）。结果与经典的压缩准静态方法吻合良好。
