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Wednesday, July 10 • 10:50 - 11:10
IMPROVING THE SOUND TRANSMISSION LOSS OF STRUCTURES USING DISTRIBUTED SMALL-SCALE RESONATORS

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One of the top priorities in the general transportation industry for noise, vibration and harshness objectives is the design of lightweight and efficient soundproofing packages. This paper presents a concept of small-scale distributed tuned mass damper solution applied to the case of a realistic aircraft sidewall panel. The targeted bandwidth is around the curved fuselage's ring mode, which is known to produce an important dip in the Sound Transmission Loss of curved structures. A variety of experimental realizations are reported, including an investigation of the resonators distribution on the STL of the panel under a diffuse field excitation. Since the proposed concept involves tunable resonators, a multi-resonant solution based on the combination of resonators tuned at different frequencies is proposed to enlarge the efficiency bandwidth of the locally resonant add-on. Moreover, due to their low volume the small-scale resonators present a high embedding capability and can be combined with other existing sound packages. This possibility is demonstrated with a melamine foam, the resonators' narrow-band and foam's broadband effects being nearly always additive. Large improvement of the measured STL is observed around the ring frequency with very small alteration of the overall sound insulation performances and limited added mass (about 5 percent). As the proposed realization demonstrates the high potential of small-scale resonant add-ons in the transportation industry, other possible applications are discussed and a live demonstration is planned during the presentation.

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 10:50 - 11:10 EDT
St-Laurent 5
  T08 Mat. for noise & vibr. cntrl., SS01 Pasv snd absorb & insul mtrl