Identification of Acoustic Modeling Parameters of Porous Materials

Master your Material Parameters

During the process of designing acoustic treatments including porous materials, the definition of the modeling parameters of these materials is a critical step.

FOAM-X allows you to extract the following parameters: 


Thermal Permeability





Open Porosity






Young's Modulus

Resistivity to the Passage of Static Air

Λ’ | Λ

Characteristic Lengths



Exploit all FOAM-X Possibilities

Works with all standards related to impedance and transmission tube

ASTM E1050 | ISO 10534-2 | ASTM 2611 (mesure acoustique directe)

Characterize several types of open-cell porous materials

Foam | Fibrous | Perforated sheet | Resistive screen | Fabric

Characterize three types of structure

Rigid | Flexible | Elastic

Takes into account the boundary conditions of the assembly of the material

Tight material | Slippery material | Material with air leaks

Profit from a Perfect Integration with Mecanum Equipments! 

Mecanum - Impedance and Transmission Tube

TUBE - Impedance Tubes

Mecanum - SIGMA Resistivity Meter

SIGMA - Resistivity Meter

Mecanum - PHI Porosity and Density Meter

PHI - Porosity and Density Meter

Mecanum - QMA Quasi-Static Mechanical Analyser

QMA - Mechanical Analyser

Mecanum - TOR Tortuosity Meter

TOR - Tortuosity Meter

More Pictures and Videos

FOAM-X Méthode inverse - Matériaux poreux

Inverse Method

And Even More Functions!

Identification of Acoustic Modeling Parameters​

  • Calculates the mean and standard deviation of the data set.

  • Corrects tube and measurement conditions (temperature, atmospheric pressure and relative humidity).

  • The user can provide parameters to improve convergence (density, resistivity, porosity, tortuosity and other parameters).

  • Identification according to three types of skeleton (rigid, flexible or elastic).

  • Identification over a range of frequencies (min, max).

Display, Simulation and Sensitivity Analysis

  • Validation of the parameters obtained by comparison of simulations using analytical or numerical poroelastic models (finite elements) with impedance/transmission tube measurements.

  • Plots both predicted and measured data (if available) of:

    • Absorption, reflection or surface impedance coefficient,

    • Attenuation index,

    • Dynamic properties (characteristic impedance, wave number, effective dynamic density, effective bulk modulus),

    • Backup (export).

  • The software simulates the effects of boundary conditions and lateral acoustic leakage in tubes by the axisymmetric finite element method (axiFEM).

  • The software predicts all the acoustic properties in the case of excitation by a plane wave of normal incidence such as: absorption coefficient, attenuation index, surface and characteristic impedance, number of complex wave, effective dynamic density and effective bulk modulus.

  • The simulations take into account:

    • The type of termination (air cavity, rigid bottom or anechoic),

    • The boundary conditions (embedded, sliding, with air leaks),

    • The type of skeleton (rigid, flexible and elastic),

    • The material thickness and diameter,

    • The atmospheric conditions,

    • The parameter uncertainties.


  • Retains materials identified by FOAM-X or your own method.

  • Searches for materials according to different criteria (e.g. price, porosity, resistivity to the passage of air, thickness, etc.).

  • Compare two materials.