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Material Characterization

Characterization services for noise control

Mecanum offers a full characterization services of porous and damping materials used for noise control. The characterization uses state-of-the-art equipments and can characterize all the porous and damping material properties. These properties are required to optimize materials and sound packages, to perform quality control, and to use as input parameters in acoustical simulation software. The porous material properties are those based on the Biot’s poroelasticity theory and related equivalent fluid models (Johnson-Allard, Johnson-Lafarge, Attenborough, Delany-Bazley, Miki, etc.).

Types of porous materials

  • Polymeric foams
  • Fiber materials
  • Fabrics
  • Recycled fibers
  • Perforated plates
  • Resistive films
  • Felts
  • Carpets
  • Acoustic tiles
  • Granular materials

Porous material characterization

➡ Open porosity and bulk density

➡ Static airflow resistivity and permeability

➡ Tortuosity

➡ Viscous and thermal characteristic lengths

➡ Thermal permeability

➡ Specific surface

➡ Elastic properties (Young’s modulus, Poisson’s ratio, damping loss)

Impedance and transmission tube tests

➡ Normal sound absorption

➡ Surface impedance

➡ Reflection coefficient

➡ Characteristic impedance

➡ Dynamic density

➡ Dynamic compressibility

➡ Normal sound transmission loss

➡ Propagation constant or wave number

Damping material properties

➡ Frequency dependent Young’s modulus

➡ Frequency dependent damping loss factor

➡ Frequency dependent shear modulus

Download Characterization Documents

➡ Porous Material Modeling Presentation

➡ Characterization Report Example

➡ Porous Material Characterization Presentation