Loading…
This event has ended. Visit the official site or create your own event on Sched.
Welcome to ICSV26!
Back To Schedule
Thursday, July 11 • 10:00 - 10:20
SUSTAINABLE ACOUSTICAL FIBROUS MATERIAL OPTIMIZATION USING MICRO-MACRO MODEL FOR RANDOM HOLLOW FIBER STRUCTURES

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

Feedback form is now closed.
Recently, micro-macro relationships were developed to link non-acoustic properties of random fiber structures to its local geometry. This paper presents the applicability of these relationships for the case of a non-woven natural hollow fiber structure made from milkweed floss, a natural hollow fibre. The hypothesis that hollowness of the fibre has only small effects on the acoustics of the material is verified. This is done to ensure that the use of a single porosity model is justified. Therefore, the micro-macro solid fibre relationships are used to retrieve the macroscopic transport and acoustic properties of the fibrous material by the only knowledge of four measured microstructural features: porosity, effective inner and outer radii of the hollow fibre, and fibre angular orientation. Sound absorption coefficient predicted by two rigid-frame porous models are compared with standing wave tube measurements. The two rigid-frame porous models are the six-parameter Johnson-Champoux- Allard-Lafarge's (JCAL) model and the one-parameter Miki's model. The parameters of these models are obtained by the micro-macro solid fibre relationships. The fibres of the tested nonwoven materials are mainly arranged randomly in parallel planes (i.e., layered fibrous media showing transverse isotropy). The predictions obtained by both rigid-frame porous models agree with experimental data when the acoustic excitation is normal to the layered fibrous media as well as when excitation is perpendicular.

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

Thursday July 11, 2019 10:00 - 10:20 EDT
St-Laurent 5
  T08 Mat. for noise & vibr. cntrl., SS01 Pasv snd absorb & insul mtrl