APMR : Acoustical Porous Material Recipes

The aim of this site is to gather information about works in the field of acoustical porous materials: models for the propagation of sound, parameter definitions and characterization techniques, standards...

 

Content

Propagation models

• Motionless skeleton (equivalent fluid)
• Delany-Bazley
• Delany-Bazley-Miki
• Horoshenkov et al.
• Johnson-Champoux-Allard
• Johnson-Champoux-Allard-Lafarge
• Johnson-Champoux-Allard-Pride-Lafarge
• Wilson
• Uniform pressure (equivalent solid)
• Diphasic (Biot's theory)
• Linking micro-structure to macro-properties

Parameters of models

• Static air flow resistivity (& static permeability)
• Open porosity
• High frequency limit of the dynamic tortuosity
• Viscous characteristic length
• Thermal characteristic length
• Static thermal permeability

Characterization of parameters

• Static air flow resistivity (& permeability)
• Open porosity
• High frequency limit of the dynamic tortuosity
• Viscous characteristic length
• Thermal characteristic length
• Static thermal permeability
• Conditions on parameters

Basics of Acoustics

• Some physical phenomena
• Compressional wave
• Propagative vs. standing waves
• Wave number
• Wave dispersion
• Length corrections
• Darcy's law
• Viscous boundary layer
• Helmholtz resonator
• Transmission Loss of a single partition
• The coincidence frequency

Basics of Mechanics

• Single degree of freedom (SDOF) systems
• Solution to undamped 1D harmonic oscillator
• Beam bending (compute eigenfrequencies)
• Comparison of damping models
• Snell-Descartes to variational principles
• Variational methods
• Flow around a disk
• Limits of plate theories
• Condensed models for multilayer structures

Basics of Materials

• Material classes
• A note about "meta-materials"
• A note about fractional derivatives
     used in some visco-elastic models

Standards

• A list of standards for acoustical materials
• Octave and third-octave bands from ISO 3
• Sound Absorption Average from ASTM C423

Upcoming events

Below are conferences or events for which one or more sessions on acoustical porous materials are organized.

SAPEM 2026 (Symposium on the Acoustics of Poro-Elastic Materials)

Nov. 16-20, 2026 - Marne-la-Vallée (greater Paris, France)

Abstract submission deadline: June 15, 2026
Early bird registration: July 15, 2026

Forum Acusticum 2027 (joint conference with ASA)

June 21-25, 2027 - Brussels (Belgium)

Abstract submission deadline: Jan. 25 2027
Early bird registration: March 15, 2027

Internoise 2027

August 22-15, 2027 - Padova (Italy)

Abstract submission deadline: Feb. 28 2027
Early bird registration: May 23 2027

NOVEM 2027 (NOise and Vibration Emerging Methods)

Oct. 11-14, 2027 - Wuzhen (China)

Abstract submission deadline: April 30, 2027
Early bird registration deadline: July 31, 2027

Forum Acusticum 2028 (joint conference with ICA)

Sept. 11-14, 2028 - Funchal, Madeira (Portugal)

Abstract submission deadline: to be announced
Early bird registration: to be announced