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Experimental Study of Acoustic and Thermal Performance of Sound Absorbers with Microperforated Aluminum Foil
ISSN: 0148-7191, e-ISSN: 2688-3627
Published June 5, 2019 by SAE International in United States
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Aluminum foil applied to the surface of sound absorbing materials has broad application in the automotive industry. A foil layer offers thermal insulation for components close to exhaust pipes, turbo chargers, and other heat sources in the engine compartment and underbody. It can also add physical protection for acoustic parts in water-splash or stone-impingement areas of the vehicle exterior. It is known that adding impermeable plain foil will impact the sound absorption negatively, so Microperforated Aluminum Foil (MPAF) is widely used to counteract this effect. Acoustic characteristics of MPAF can be modeled analytically, but deviation of perforation size and shape, variation of hole density, material compression, and adhesive applied to the back of the foil for the molding process can impact the acoustic and thermal insulation performance. Because we cannot rely on analytical tools to generate accurate performance of these materials in a production environment, this paper will focus on the acoustic and thermal experimental characterization of these materials. Studies were conducted on flat test samples which have commonly used MPAF applied to the top surface. Results are presented showing the effects of the hole perforation size and density on the acoustic and thermal performance. Results are compared with sound absorbers with other facing materials. Conclusions from this investigation provide guidance for the selection of MPAF during the sound absorber development.
CitationYin, G., Parrett, A., Salazar Prieto, F., and Roggenkamp, T., "Experimental Study of Acoustic and Thermal Performance of Sound Absorbers with Microperforated Aluminum Foil," SAE Technical Paper 2019-01-1580, 2019, https://doi.org/10.4271/2019-01-1580.
- Maa, D.Y. , “Potential of Microperforated Panel Absorber,” J Acoustic Soc 20:1-10, 1998.
- Maa, D.Y. , “Design of Microperforated Panel Constructions,” ACTA Acoustics (In Chinese) 13(3):174-180, 1980.
- Maa, D.Y. , “General Theory and Design of Microperforated Panel Absorbers,” Chinese Journal of Acoustics 16(3):193-202, 1997.
- Allard, J.F. , Propagation of Sound in Porous Media. Modeling Sound Absorbing Materials (Elsevier Science, 1993).
- Sakagami, K. et al. , “Sound Absorption Characteristics of A Single Microperforated Panel Absorber Backed By A Porous Absorbent Layer,” Acoustics Australia 39(3):95-100, 2011.
- Bravo, T. et al. , “Sound Attenuation and Absorption by Microperforated Panels Backed By Anisotropic Fibrous Materials: Theoretical and Experimental Study,” Journal of Sound and Vibration 425:189-207, 2018.
- Wyerman, B., Bliton, R., and Dinsmore, M. , “Optimization of Sound Absorbers Using Resistive Facings,” SAE Technical Paper 2009-01-2137, 2009, doi:10.4271/2009-01-2137.