Acoustical parameter evolutions
Date: May 2009
Section: Home |
Parameters of models |
Acoustical parameters
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.
Growing complexity of models
Date: April 2009
Section: Home |
Propagation models |
Motionless skeleton
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.
Delany-Bazley and Delany-Bazley-Miki models
Date: March 2009
Section: Home |
Propagation models |
Motionless skeleton
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.
A brief history
Date: February 2009
Section: Home
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
Date: January 2009
Section: Home |
Propagation models |
Motionless skeleton
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
Date: January 2009
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.