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Article
Acoustic contributions of a sound absorbing blanket placed in a double panel structure: Absorption Versus Transmission
J. Acoust. Soc. Am. (2010)
  • Olivier Doutres, University of Sherbrooke
  • Noureddine Atalla, University of Sherbrooke
Abstract
The objective of this paper is to propose a simple tool to estimate the absorption vs. transmission loss contributions of a multilayered blanket unbounded in a double panel structure and thus guide its optimization. The normal incidence airborne sound transmission loss of the double panel structure, without structure-borne connections, is written in terms of three main contributions; (i) sound transmission loss of the panels, (ii) sound transmission loss of the blanket and (iii) sound absorption due to multiple reflections inside the cavity. The method is applied to four different blankets frequently used in automotive and aeronautic applications: a non-symmetric multilayer made of a screen in sandwich between two porous layers and three symmetric porous layers having different pore geometries. It is shown that the absorption behavior of the blanket controls the acoustic behavior of the treatment at low and medium frequencies and its transmission loss at high frequencies. Acoustic treatment having poor sound absorption behavior can affect the performance of the double panel structure. Copyright (2010) Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.
Keywords
  • Double panel,
  • porous material,
  • transmission loss,
  • absorption,
  • plane wave
Publication Date
Summer August, 2010
Citation Information
Olivier Doutres and Noureddine Atalla. "Acoustic contributions of a sound absorbing blanket placed in a double panel structure: Absorption Versus Transmission" J. Acoust. Soc. Am. Vol. 128 Iss. 2 (2010)
Available at: http://works.bepress.com/olivier_doutres/1/