APMR

Acoustical Porous Material Recipes

Acoustical parameter evolutions

The picture of the month shows parameter evolutions of Johnson-Champoux-Allard model for various pore microstructures.
This picture is based on a slide of the plenary lecture given by Walter Lauriks from Leuven's team during SAPEM 2005.

Previous post: Growing complexity of models has been updated with I hope an improved clarity.

Luc.

Acoustical parameter evolutions

Growing complexity of models

As promised, here is a first version of a picture exposing the growing complexity of propagation models for motionless skeletons since Zwikker and Kosten. This picture can probably be improved, we are waiting for your propositions.

Other models with e.g. multiple scale or pore size distributions will be presented in further works.

Luc & F.-X.

Growing complexity of models

Delany-Bazley and Delany-Bazley-Miki models

Before the release of a new page exposing the growing complexity of propagation models since Zwikker and Kosten, here are updated versions of two pages describing Delany-Bazley (DB) and Delany-Bazley-Miki (DBM) models.

As a reminder, the online computation of the DBM normal incidence sound absorption is still available.

Luc.

DB model DBM model

A brief history

Acoustical Porous History

This is an updated version of the poster we presented with François-Xavier Bécot during the last SAPEM conference. We have added some contributions made by conference attendees (the ones we could read and for which we could find reference).
Please, fell free to send your contributions to the list by e-mail: apmr at matelys dot com.

Luc & F.-X..

Regular-pore-shape expressions

Simple cell models

Here is a quick reminder to compute dynamic mass density and bulk modulus for materials having cylindrical pores with regular and "simple" cross-sections. Click the image to see a larger view.

Fell free to send corrections or comments to apmr at matelys dot com.

Luc.

New design

APMR web site has been re-designed. I hope you you will find this new version more pratical to see what are the new developments on these pages.
The old index page will be kept online the time for me and my colleague François-Xavier Bécot to harmonize pages on APMR (it might take a while).

Luc Jaouen.

About

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

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Want to contribute ?

If you are interested to contribute to APMR, you are welcome to send contributions or comments to apmr at matelys dot com.