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.

Internoise 2026

August 9-12, 2026 - Adelaide (Australia)

Abstract submission deadline: Feb. 1, 2026
Early bird registration: during May 2026

International Conference on Noise and Vibration Engineering & USD conference on Uncertainty in Structural Dynamics 2026

September 7-9, 2026 - Leuven (Belgium)

Abstract submission deadline: during October 2025, 2024
Early bird registration: to be announced in 2026

Forum Acusticum 2026

Sept. 8-12, 2026 - Graz (Austria)

Abstract submission deadline: May 13, 2026
Early bird registration: June 28, 2026

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: to be announced in late 2026
Early bird registration: to be announced in late 2026

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