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Wednesday, July 10 • 17:50 - 18:10
ACOUSTIC PROPERTIES OF A HYBRID SOUND ABSORBER COMPOSED OF POLYURETHANE FOAMS AND HELMHOLTZ RESONATOR

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This paper develops a tunable dual-band perfect sound absorber to improve the low-frequency absorption based on the polyurethane foam. First, we propose a hybrid sound absorber composed of the polyurethane foam and Helmholtz resonator. The impedances of the Helmholtz resonator and the polyurethane foam are derived by the Helmholtz resonator theory and Delany-Bazley empirical formulations. Then the equivalent network is applied to present the impedance of the hybrid sound absorber. Next, numerical applications are implemented using MATLAB to predict the sound absorption coefficients of the hybrid sound absorber. It shows that the hybrid sound absorber can provide more sound absorption than the polyurethane foam in low frequency, while in high frequency, it provides more than the Helmholtz resonator. It also implies that the hybrid sound absorber is a tunable sound absorber in low frequency. Finally, experiments have been done by the two-microphone impedance tube method to validate the theoretical results.

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 17:50 - 18:10 EDT
St-Laurent 5
  T08 Mat. for noise & vibr. cntrl., SS01 Pasv snd absorb & insul mtrl