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Identification of Adhesive Bond in A Multi-Layered Structure Via Sound Insulation Characterestics

Published online by Cambridge University Press:  05 May 2011

S. Malakooti ,
N. Mohammadi ,
M. J. Mahjoob  and
K. Mohammadi
S. Malakooti*
Affiliation:
Noise, Vibration and Acoustics Research Center, School of Mechanical Engineering, University of Tehran, Tehran, Iran
N. Mohammadi*
Affiliation:
Noise, Vibration and Acoustics Research Center, School of Mechanical Engineering, University of Tehran, Tehran, Iran
M. J. Mahjoob*
Affiliation:
Noise, Vibration and Acoustics Research Center, School of Mechanical Engineering, University of Tehran, Tehran, Iran
K. Mohammadi*
Affiliation:
School of Civil Engineering, University of Tehran, Tehran, Iran
*
*Research fellow (M.Sc), corresponding author
**Research fellow (Ph.D.)
***Associate Professor
****M.Sc.
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Abstract

In this paper, adhesive bonds in multi-layered plates are identified based on experimental values of their sound insulation characteristics. An exact model based on two-dimensional elasticity theory is formulated. The problem is a time harmonic plane acoustic progressive wave interaction with an isotropic multi-layered infinite elastic plate with interlaminar bonding imperfections. The T-matrix solution technique, which involves a system global transfer matrix, is formed as the product of individual transfer matrices. This is accomplished by applying continuity of the displacement and stress components at the interfaces of neighboring layers along with the relevant boundary conditions at the left and right interfaces of the plate with the surrounding acoustic fluid (air). The resulting equations are then solved for the unknown plane wave reflection and transmission coefficients. The experimental values of sound transmission loss (TL) are measured by a modified B&K impedance tube. Results are presented for a double-layered (lead-steel) plate while the layers are bonded together with metal glue. The normal and transverse adhesive spring constants of the metal glue are then identified in an inverse manner. The agreement of experiments with the analytical TL values predicted for a new triple-layered plate (based on the identified bond properties) confirms the validity of the method.

Keywords

Adhesive bond identificationSound insulationTransmission lossImpedance tubeMulti-layered plate.
Type
Articles
Information
Journal of Mechanics , Volume 26 , Issue 3 , September 2010 , pp. 363 - 372
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2010

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