Loading…
This event has ended. Visit the official site or create your own event on Sched.
Welcome to ICSV26!
Back To Schedule
Wednesday, July 10 • 11:10 - 11:30
ABSORBENT MATERIAL CONTAINING HOLES WITH DECREASING PROFILE TO IMPROVE SOUND ABSORPTION

Log in to save this to your schedule, view media, leave feedback and see who's attending!

Feedback form is now closed.
Sound-absorbing materials absorb sound waves to reduce acoustic reflection. At a given frequency, and for a given material, the sound absorption coefficient reaches an asymptotic value for a maximum thickness. With a thickness equal to the penetration depth, the absorption coefficient varies only very slowly with a thickness addition. In practice, it almost stops evolving and reaches the asymptotic value with a thickness equal to three times the viscous penetration depth. An extra thickness on this depth is then useless for sound absorption. This presentation presents a method for overcoming the asymptotic absorption of a sound-absorbing material and for increasing sound absorption above the asymptotic value. The idea is to increase the penetration depth of incoming acoustical waves to infinity. This is achieved by adding holes with a particular decreasing profile in the material. This approach will be compared to typical wedge designs and double-porosity media for different basic porous materials. An example of a calculation will also be presented to design an almost anechoic treatment.

Moderators
FA

francesco Asdrubali

Full Professor, Università Roma Tre - Department of Engineering
TD

Thomas Dupont

Associate Professor, École de Technologie Supérieure (ÉTS)
PL

Philippe Leclaire

Prof., ISAT - University of Burgundy
avatar for Raymond Panneton

Raymond Panneton

Ing., Ph.D., GAUS, Université de Sherbrooke
Raymond Panneton is a professor-researcher in the Department of Mechanical Engineering at the Université de Sherbrooke since 1998. His research program focuses on the modeling, characterization and optimization of porous acoustic media. More specifically, he explores the relationships... Read More →

Authors

Wednesday July 10, 2019 11:10 - 11:30 EDT
St-Laurent 5
  T08 Mat. for noise & vibr. cntrl., SS01 Pasv snd absorb & insul mtrl