Microstructure based model for sound absorption predictions of perforated closed-cell metallic foams.
Closed-cell metallic foams are known for their rigidity, lightness, thermal conductivity as well as their low production cost compared to open-cell metallic foams. However, they are also poor sound absorbers. Similarly to a rigid solid, a method to enhance their sound absorption is to perforate them. This method has shown good preliminary results but has not yet been analyzed from a microstructure point of view. The objective of this work is to better understand how perforations interact with closed-cell foam microstructure and how it modifies the sound absorption of the foam. A simple two-dimensional microstructural model of the perforated closed-cell metallic foam is presented and numerically solved. A rough three-dimensional conversion of the two-dimensional results is proposed. The results obtained with the calculation method show that the perforated closed-cell foam behaves similarly to a perforated solid; however, its sound absorption is modulated by the foam microstructure, and most particularly by the diameters of both perforation and pore. A comparison with measurements demonstrates that the proposed calculation method yields realistic trends. Some design guides are also proposed.
GAUS, Department of Mechanical Engineering, Université de Sherbrooke, Quebec J1K 2R1, Canada. fabien.chevillotte@2006.ecam.fr
Fabien
F
Chevillotte
Camille
C
Perrot
Raymond
R
Panneton
D000042:Absorption; D000162:Acoustics / Q000295:instrumentation; D003198:Computer Simulation; D004867:Equipment Design; D020342:Finite Element Analysis; D008670:Metals; D008962:Models, Theoretical; D009622:Noise / Q000517:prevention & control; D009716:Numerical Analysis, Computer-Assisted; D016062:Porosity; D011312:Pressure; D013016:Sound; D013696:Temperature; D014783:Viscosity
D008670:Metals