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The aim of this site is to gather information and feedbacks about published or unpublished works in the field of acoustical porous material: models for the propagation of sound, parameter definitions and characterization techniques, standards...

 

Interactive slides + video recordings of the presentations by Jaouen, Bécot & Chevillotte during Forum Acusticum 2020.

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
• 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 (Updated March 4, 2021)
• Viscous characteristic length
• Thermal characteristic length
• Static thermal permeability
• Conditions on parameters

Basics of Acoustics

• Compressional wave
• Propagative vs. standing waves
• Wave number
• Wave dispersion
• Length corrections
      (Updated on April 19, 2021)
• 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
      (Added February 9, 2021)

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 2021

August 1-4, 2021 - online

SAE 2021 Noise and Vibration Conference & Exhibition

Sept. 7-10, 2021 - DeVos Place Convention Center Grand Rapids (MI, USA) & online

Early bird registration: August 16, 2021.

NOVEM 2023 (NOise and Vibration Emerging Methods)

Jan. 10-12, 2023 - Auckland (New Zealand)

Abstract submission deadline: June 30, 2022 for peer-reviewed submission
(July 31, 2022 otherwise)
Early bird registration deadline: Nov. 1, 2022