The open porosity of air-saturated acoustical porous materials is estimated from the low-frequency or high-frequency asymptotes of the real part of the dynamic bulk modulus. Combining this technique with the estimation of the static air-flow resistivity from the low-frequency asymptote of the imaginary part of the dynamic mass density and the analytical inversions of the remaining parameters from the dynamic mass density and bulk modulus [methods introduced by Panneton and Olny, J. Acoust. Soc. Am. 119(4), 2027–2040 (2006) and Olny and Panneton 123(2), 814–824 (2008)], this work estimates all six parameters of a Johnson-Champoux-Allard-Lafarge model from impedance tube measurements. A classical two-microphone impedance tube, as well as three- or four-microphone tubes, can be used for these measurements and estimations. Examples of applications and limits of the method are presented and a tool to estimate the open porosity and the static air-flow resistivity is made available online.

中文翻译：

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从阻抗管测量值估计多孔多孔材料的Johnson-Champoux-Allard-Lafarge模型的所有六个参数

空气饱和的声学多孔材料的开孔孔隙率是根据动态体积模量实部的低频或高频渐近线估算的。结合这项技术与根据动态质量密度虚部的低频渐近线估计静态气流阻力，并根据动态质量密度和体积模量[剩余的参数，由Panneton和奥尔尼，J。Acoust。Soc。上午。119（4），2027-2040（2006）和Olny和Panneton 123（2），814–824（2008）]，这项工作从阻抗管测量值估计了Johnson-Champoux-Allard-Lafarge模型的所有六个参数。可以使用经典的两麦克风阻抗管以及三或四麦克风管进行这些测量和估计。给出了该方法的应用实例和限制，并在线提供了一种用于估算开孔率和静态气流电阻率的工具。