This article presents numerical simulation studies on the vibration and acoustic response characteristics of a multilayered viscoelastic sandwich plate in a thermal environment. Initially the critical buckling temperature is obtained followed by free and forced vibration analyses considering the pre-stress due to the imposed thermal environment in the plate. The vibration response predicted is then used to compute the sound radiation. The critical buckling temperature and vibration response are obtained using finite element method while sound radiation characteristics are obtained using boundary element method. It is found that resonant amplitude of both the vibration and acoustic response decreases with increase in temperature. The influence of core thickness, number of layers, type of thermal field, and type of viscoelastic core material on vibration response sound radiation characteristics are studied in detail. © The Author(s) 2011.

Chandramouli Padmanabhan

Natrajan Ganesan

Jeyaraj P

Padmanabhan C

Ganesan N.

ACOUSTIC RESPONSE

BUCKLING TEMPERATURE

Free and forced vibration analysis

Multi-layered

Number of layers

NUMERICAL SIMULATION STUDIES

Pre-stress

RESONANT AMPLITUDE

Sandwich plates

SOUND RADIATIONS

Thermal buckling

Thermal environment

THERMAL FIELD

VIBRATION AND ACOUSTIC RESPONSE

VIBRATION RESPONSE

VIBRO-ACOUSTIC BEHAVIORS

VISCOELASTIC CORES

ACOUSTIC GENERATORS

Acoustic properties

Acoustic wave propagation

Acoustic wave scattering

Boundary element method

Buckling

Coremaking

finite element method

vibration analysis

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Vibro-acoustic behavior of a multilayered viscoelastic sandwich plate under a thermal environment:

Journal of Sandwich Structures and Materials

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Vibro-acoustic response and sound transmission loss characteristics of truss core sandwich panel filled with foam

This paper presents numerical studies on the vibration and acoustic response characteristics of a fiber-reinforced composite plate in a thermal environment by considering the inherent material damping property of the composite material. Initially the critical buckling temperature is obtained, followed by free and forced vibration analyses considering the pre-stress due to the imposed thermal environment. The vibration response predicted is then used to compute the sound radiation. The critical buckling temperature and vibration response are obtained using the finite element method based on the Classical Laminate Plate Theory (CLPT) while sound radiation characteristics are obtained using a coupled FEM/BEM technique. It is found that the vibration response of the structure reduces with an increase in uniform temperature rise for both Glass Epoxy and PEEK/IM7 materials, but the overall sound radiation of the plate reduces only marginally due to interaction between reduced stiffness and enhanced damping. © 2008 Elsevier Ltd. All rights reserved.

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Vibration and acoustic response of a composite plate with inherent material damping in a thermal environment

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Thermal effect on vibration of non-homogenous visco-elastic rectangular plate of linearly varying thickness

The present work deals with the thermal buckling and vibration behavior of multi-layer rectangular viscoelastic sandwich plates. A decoupled thermo-mechanical analysis is made by using finite element method. An all side clamped (C-C-C-C) plate under thermal loads is analyzed for thermal buckling, frequency and damping behavior. The temperature-dependent characteristics of complex shear modulus of viscoelastic core are accounted. The formulation proposed by Kathua and Cheung [Bending and vibration of multi-layer sandwich beams and plates, International Journal for Numerical Methods in Engineering 6 (1973) 11-24] has been extended to study the thermal buckling and for predicting the critical buckling temperature of the multi-layer viscoelastic sandwich plates. The variation of natural frequency and loss factor with temperature has been studied. A parametric study is conducted to estimate the effect of core thickness and progressive sandwiching. Several interesting phenomenon like shifting of modes with temperature, decrease of membrane stiffness with the increase in core thickness and increase in level of sandwiching has been observed. © 2007 Elsevier Ltd. All rights reserved.

Thermal buckling and vibration behavior of multi-layer rectangular viscoelastic sandwich plates

This paper presents numerical simulation studies on the vibration and acoustic response characteristics of an isotropic rectangular plate in a thermal environment using commercial finite element softwares ANSYS and SYSNOISE. First the critical buckling temperature is obtained, followed by modal and harmonic analyses considering prestress due to the thermal field in the plate, with the critical buckling temperature as a parameter. The vibration response predicted is then used to compute the sound radiation. It is found that the displacement response of the structure increases with an increase in temperature for all boundary conditions. The overall sound radiation of the plate marginally increases with an increase in temperature for all boundary conditions when the temperature approaches the critical buckling temperature although there is a sharp increase in sound power levels. Copyright © 2008 by ASME.

Journal of Vibration and Acoustics, Transactions of the ASME

Vibration and acoustic response of an isotropic plate in a thermal environment

The measurement of the loss factors of beams and plates with constrained and unconstrained damping layers: A critical assessment

Vibro-acoustic behavior of a multilayered viscoelastic sandwich plate under a thermal environment

Journal	Journal of Sandwich Structures and Materials
ISSN	10996362
Open Access	No