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 • 09:40 - 10:00
METHODS OF SYNTHESIS AND IN-SITU FILLING OF ACOUSTIC MATERIALS WITH NANOPOWDERS TO IM-PROVE THE LOW FREQUENCY SOUND ABSORPTION

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

Feedback form is now closed.
This paper presents a strategy of noise control. This includes a chemical method for syn-thesis of nanopowders of the oxides using a sequence of decomposition reactions, e.g. Al2O3 series with particles of 50‒70 nm to microsizes. Also the physical method of evapo-ration of a solid with the electron beam was used to obtain the nanopowders of given pa-rameters, e.g. Fe3O4 series and a microsized grit with nanopores of 10 to 20 nm. The pow-ders and their granules are used as initial elements in producing the single and mixed fill-ers for designing the acoustic composites. One of such design methods is based on deposi-tion and in-situ synthesis of the "passive" fillers on inner surfaces of an acoustic material as on a matrix. Rational groups of compounds, e.g. CuO+Al2O3 series were produced and selected to prepare the liquid suspensions and impregnation of the materials with the fill-ers. This method allows reasonable changing the concentration of the solutions and dis-persing the fillers to form the perforated films safely adherent with the matrix structure. Other method of the composites' design consists in regulated entering the "active" fillers, e.g. Fe3O4 into the matrix. The study shown ferromagnetic properties, which do not de-grade in dispersing the Fe3O4 particles in water or in granulating. The strategy is validated through the experiments using the low frequency, 125−1600 Hz, acoustic duct. Thin-layer, 15−18 mm, composites impregnated with "passive" single or mixed fillers increase the sound absorption ratio by 60% in given frequency bands, and by 350−400% if the thick-ness increased to 35−48 mm. Besides, the nanoporous Fe3O4-grit can be distributed and held in the matrix using an external magnetic field. This can result in the ratio increase from 0.1‒0.45 (for prevalent acoustic materials) to 0.4‒0.99 (for designed composites), with the same small layer thickness, 20−40 mm

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 09:40 - 10:00 EDT
St-Laurent 5
  T08 Mat. for noise & vibr. cntrl., SS01 Pasv snd absorb & insul mtrl