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Glossary of terms, models and methods related to the research field of acoustical porous materials
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Glossary of terms, models and methods related to the research field of acoustical porous materials
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Johnson-Champoux-Allard model | APMR
http://apmr.matelys.com/PropagationModels/MotionlessSkeleton/JohnsonChampouxAllardModel.html
Acoustical Porous Material Recipes. The Johnson-Champoux-Allard model is based on the work by Johnson, Koplik and Dashen to desribe visco-inertial dissipative effects inside the porous media. The work by Champoux and Allard is used to describe the thermal dissipative effects. In 1987, Johnson Koplik and Dashen. Proposed a semi-phenomenological model to describe the complex density of an acoustical porous material with a motionless skeleton having arbitrary pore shapes. This expression is:. Widetilde{K}( ...
Open porosity | APMR
http://apmr.matelys.com/Parameters/OpenPorosity.html
Acoustical Porous Material Recipes. The open porosity, term commonly reduced to porosity, refers to the ratio of the fluid volume occupied by the continuous fluid phase to the total volume of porous material. The open porosity is usually identified by the greek letter $ phi$. However, in the original work by Biot, $h$ is used to denote this parameter. The open porosity can be directly measured. Beranek L. L., Acoustic impedance of porous materials. Schematic representation of an acoustical porous medium.
Static [viscous] permeability | APMR
http://apmr.matelys.com/Parameters/StaticPermeability.html
Acoustical Porous Material Recipes. The static permeability (or static viscous permeability to avoid confusion with the static thermal permeability. Is defined as the ratio of the dynamic viscosity of air over the static air-flow resistivity. It is usually identified by the symbol $k 0$ and its dimension in the international system of units is m$ {2}$ (i.e. it has the dimension of a surface). The mathematical definition of the static permeability, $k 0$, is:. K 0 = lim { omega rightarrow 0} k( omega) ].
Motionless skeleton models | APMR
http://apmr.matelys.com/PropagationModels/MotionlessSkeleton/index.html
Acoustical Porous Material Recipes. Propagation models assuming a motionless skeleton. When a porous material has a stiffness, or a weight, of order of magnitude much greater than the one of the air and if it is excited by an acoustic loading, at a frequency much higher than the phase decoupling frequency. The material skeleton can be considered as rigid and motionless. Wave equation for motionless skeleton models. Overview of the different motionless skeleton models. Here, the mean free path is the aver...
Johnson-Champoux-Allard-Pride-Lafarge model | APMR
http://apmr.matelys.com/PropagationModels/MotionlessSkeleton/JohnsonChampouxAllardPrideLafargeModel.html
Acoustical Porous Material Recipes. The Johnson-Champoux-Allard-Pride-Lafarge (JCAPL) model is based on the works by Johnson, Koplik and Dashen and Pride, Morgan and Gangi to desribe visco-inertial dissipative effects inside the porous media. The works by Champoux and Allard; Pride, Morgan and Gangi and Lafarge, Lemarinier, Allard and Tarnow are used to describe the thermal dissipative effects. Links with JCA and JCAL models. In 1987, Johnson Koplik and Dashen. Lambda$ and the static viscous tortuosity.
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We build our reputation on the acknowledgement of our research skills by the academic world. Get an idea of our expertise by reading our peer-reviewed articles. Or our proceedings of conferences. Resulting mostly from internal R&D studies which occupy around 30% of our time. You can also check APMR. For a more digest. Presentation of our works in a historical context. On the modeling of visco-thermal dissipations in heterogeneous porous media. F Chevillotte, L. Jaouen, F.-X. Bécot,. O Dazel, F.-X....
Digest | Matelys
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We digest scientific works, build training programs and can help you to advertise your innovations to specific audiences. We provide specific and on-demand training programs to update or deepen your knowledge. Measurement techniques for the acoustic and elastic characterizations of porous media. Building acoustic and vibrations. We select and digest publications, take the essence of them to make reactive documents. Mm-thick perforated plate (or facing screen) with. Bull; a perforation rate of. We are reg...
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Acoustical Porous Material Recipes. The aim of this site is to gather information and experience feedbacks about the published works in the field of acoustical porous material: models for the propagation of sound, parameter definitions and characterization techniques, standards. The content of APMR is growing day after day. Below are the subjects discussed or planned to be discussed. 8226; Motionless skeleton. 8226; Uniform pressure. 8226; Linking micro-structure to macro-properties. 8226; Open porosity.
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