Vibration and Acoustic Response of an Isotropic Plate in a Thermal Environment
01 Oct 2008-Journal of Vibration and Acoustics (American Society of Mechanical Engineers)-Vol. 130, Iss: 5, pp 051005
TL;DR: In this article, the authors presented 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.
Abstract: 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.
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TL;DR: In this paper, the authors focused on the vibration and acoustic responses of the sandwich panels constituted of orthotropic materials applied a concentrated harmonic force in a high temperature environment and derived the critical temperature to prevent the thermal load excess.
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TL;DR: In this article, a study on vibration and acoustic radiation characters of an isotropic rectangular thin plate under thermal environments is presented, which is assumed that thermal loads caused by thermal environments just change the structure stress state.
Abstract: A study on vibration and acoustic radiation characters of an isotropic rectangular thin plate under thermal environments is presented in this paper. It is assumed that thermal loads caused by thermal environments just change the structure stress state. Thermal stresses induced by uniform temperature rise of the plate are determined with the thermo-elastic theory. Then the stress state is used in the following dynamic analysis as a pre-stressed factor. It is observed that thermal loads influence the natural frequencies evidently, especially the fundamental natural frequency. The order of mode shapes stays the same. Dynamic response peaks float to lower frequency range with the increment of structure temperature. Acoustic radiation efficiency of the plate subjected to thermal loads decreases in the mid-frequency band. For validation, numerical simulations are also carried out. It can be found that the combined approach of finite element method (FEM) and boundary element method (BEM) is more appropriate for radiation problems.
58 citations
TL;DR: Experiments to investigate the vibration and acoustic response characteristics of a clamped rectangular aluminum plate in thermal environments indicated that the initial deflection has a great influence on the natural vibration of the heated plate.
Abstract: Experiments were performed to investigate the vibration and acoustic response characteristics of a clamped rectangular aluminum plate in thermal environments. Modal tests were carried out to study the influence of thermal environment on natural vibration. With the increment of structural temperature, natural frequencies of the plate decrease obviously. Mode shape interchange was observed for the modes with frequencies very close to each other. The thermally induced softening effect has unequal influences on the plate along the two in-plane directions. Numerical methods were also employed to study the experimental phenomena. Calculated results indicated that the initial deflection has a great influence on the natural vibration of the heated plate. Even a slight curvature can reduce the thermally induced softening effect obviously. Dynamic response tests were carried out under acoustic and mechanical excitations, and the measured results indicate that the variation in damping determines the response amplitudes at resonant peaks in the test.
56 citations
TL;DR: In this paper, a truss core sandwich panel is filled with polyurethane foam (PUF) to achieve better vibro-acoustic and sound transmission loss characteristics.
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TL;DR: An analytical model for free vibration and geometrically linear thermal buckling phenomenon of a thin rectangular isotropic plate containing a continuous line surface or internal crack located at the centre of the plate using classical plate theory is proposed in this article.
Abstract: An analytical model is proposed for free vibration and geometrically linear thermal buckling phenomenon of a thin rectangular isotropic plate containing a continuous line surface or internal crack located at the centre of the plate using classical plate theory. The crack terms are formulated using Line Spring Model. The in-plane forces are due to the uniform heating of the cracked plate. Applying the Galerkin׳s method, the equation is transformed into Duffing equation which shows the effect of uniform rise in temperature on natural frequencies. A classical relation for buckling temperature for a cracked plate is also determined.
44 citations
References
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TL;DR: In this article, the thermal postbuckling behavior of graphite/epoxy multi-layered rectangular plates of various boundary conditions is studied using the finite element method using temperature dependent thermal and elastic properties of the material.
86 citations
TL;DR: In this paper, a direct-BEM/FEM method was proposed to analyze the vibration and acoustic radiation characteristics of a submerged structure, which is more effective than FEM in computing the underwater sound radiation of the stern structure.
52 citations
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51 citations
TL;DR: In this paper, the free vibration and damping characteristics of plates consisting of composite stiff-layers and an isotropic viscoelastic core were studied under thermal loads using finite element method.
47 citations
TL;DR: In this paper, a high precision triangular plate bending finite element has been extended to the buckling analysis of laminated skew plates, which involves development of the transformation matrix between global and local degrees of freedom for nodes lying on skew edges and suitable transformation of the element matrices.
Abstract: A general high precision triangular plate bending finite element has been extended to the buckling analysis of laminated skew plates. This procedure involves development of the transformation matrix between global and local degrees of freedom for nodes lying on the skew edges and suitable transformation of the element matrices. The accuracy of the present formulation has been verified against literature values. New results are obtained for antisymmetric angle-ply and cross-ply laminated skew plates. In this analysis, the critical buckling loads for different skew angles with various lamination parameters, such as number of layers, fibre orientation angle, different boundary (simply supported, clamped) and loading (uniaxial, biaxial) conditions, have been presented.
38 citations