Sound transmission loss of orthotropic sandwich panels with soft core and noise control treatment

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Proceedings title41st International Congress and Exposition on Noise Control Engineering 2012, INTER-NOISE 2012
Conference41st International Congress and Exposition on Noise Control Engineering 2012, INTER-NOISE 2012, 19 August 2012 through 22 August 2012, New York, NY
Pages64136423; # of pages: 11
SubjectCompression deformation; Control treatments; Dynamic behaviours; Membrane behaviours; Shearing deformation; Sound transmission loss; Theoretical approach; Transmission loss; Acoustic variables control; Deformation; Sandwich structures; Honeycomb structures
AbstractA new improved model of diffuse field acoustic transmission in symmetrical sandwich panels with thin skins and a soft core is presented in this paper. Generally, asymmetric motion is the only dynamic behaviour which is considered in the modeling of sandwich panels. Bending and membrane behaviour are considered in the skins while the core is assumed to be incompressible over the thickness and experiences only shearing deformations. This set of assumptions is suitable for structures with relatively stiff and thin cores. However, the symmetric mode of motion becomes important for panels with thick and soft cores which exhibit significant compression deformations over the thickness. In this paper, both symmetric and asymmetric modes of motion are considered numerically. Their impact on the transmission loss is addressed in the configuration of a sandwich panel with attached multilayer Noise Control Treatment (NCT). Experimental and literature results are compared with the numerical simulations using the present theoretical approach in order to prove the validity and effectiveness of this approach. Copyright © (2012) by the Institute of Noise Control Engineering (INCE).
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21269236
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Record identifier3721471e-a16a-43a3-8608-a0877f4d942a
Record created2013-12-12
Record modified2016-05-09
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