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Research Papers

Optimization of Noise Transmission Through Sandwich Structures

[+] Author and Article Information
Mohamed Guerich

Département de Mécanique des Systèmes,
Ecole Supérieure d'Ingénieurs Léonard de Vinci (ESILV),
Paris la Défense Cedex, Paris 92916, France
e-mail: mohamed.guerich@devinci.fr

Samir Assaf

Laboratoire d'Acoustique et Vibration,
Ecole Supérieure des Techniques Aéronautiques et de Construction Automobile (ESTACA),
34 rue Victor Hugo, Levallois-Perret 92300, France
e-mail: samir.assaf@estaca.fr

1Corresponding author.

Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received September 23, 2011; final manuscript received October 5, 2012; published online June 18, 2013. Assoc. Editor: Thomas J. Royston.

J. Vib. Acoust 135(5), 051010 (Jun 18, 2013) (13 pages) Paper No: VIB-11-1216; doi: 10.1115/1.4024216 History: Received September 23, 2011; Revised October 05, 2012

An optimization methodology to increase the noise transmission loss (TL) of damped sandwich structures is presented. The prediction of the TL uses a numerical tool based on a finite element formulation for the sandwich plate coupled to a boundary element method for the acoustic medium. This tool can be used for arbitrarily shaped three-layer sandwich plates with various boundary conditions and it is well adapted to parametric and optimization studies. First, a parametric study was conducted to choose the objective function, the constraints, and the pertinent design variables to use in the optimization problem which consist in reducing the sound power transmitted by a viscoelastically damped sandwich plate. Next, by constraining the acoustical behavior of the sandwich panel, the surface mass of the sandwich structure was minimized. It is shown that a significant reduction in the transmitted sound power can be achieved by selecting the appropriate geometric configuration and damping layer material.

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References

Figures

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Fig. 1

Assumed displacement field components through the thickness

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Fig. 2

Material properties of the viscoelastic core: (a) shear modulus and, (b) loss factor

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Fig. 5

Comparison of the TL curves for different thicknesses of the core

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Fig. 6

Comparison of the TL curves for different shear moduli of the core

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Fig. 7

Comparison of the TL curves for different loss factors of the core

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Fig. 3

Comparison of the TL curves for different sandwich plate configurations

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Fig. 4

Comparison of the modal loss factors for different sandwich plate configurations

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Fig. 8

Block diagram of the optimization process

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Fig. 9

Effect of core shear modulus on the modal parameters of the sandwich plate: (a) loss factor and (b) frequency

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Fig. 10

Material loss factor of the core obtained after optimization

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Fig. 11

TL curve obtained after the optimization process and compared to the given constraint TL

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Fig. 12

Influence of core thickness on the TL curve of the optimal sandwich plate

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