APMR : Acoustical Porous Material Recipes

The aim of this site is to gather information and feedbacks about published or unpublished works in the field of acoustical porous material: models for the propagation of sound, parameter definitions and characterization techniques, standards...

 

Content

The content of APMR is growing day after day.
Below is a table of contents of the subjects discussed or planned to be discussed and a search engine.

 (: APMR only)

Propagation models

• Motionless skeleton (equivalent fluid)
• Delany-Bazley
• Delany-Bazley-Miki
• Horoshenkov et al.
(added Jan. 19, 2023)
• 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 2023 (Symposium on the Acoustics of Poro-Elastic Materials)

Nov. 7-10, 2023 - Sorrento (Italy) AND China Acoustics Valley, Changshu (China)

Abstract submission deadline: September 1, 2023
Early bird registration: October 9, 2023

Training School on Acoustic & Elastic (Meta)-Materials

Nov. 13-17, 2023 - Valencia (Spain)

Deadline for registration and payment of lunches/dinners: 29 September 2023.

Internoise 2024

August 25-29, 2024 - Nantes (France)

Abstract submission deadline: Feb. 9, 2024
Early bird registration: May 10, 2024