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 article, an analytical study on the dynamic characteristics of a laminated plate under temperature gradient is carried out, where theoretical formulations are derived with the first order shear deformation theory and von Karman nonlinear strain displacement relationship considering the effect of temperature gradient.
28 citations
Cites background from "Vibration and Acoustic Response of ..."
...[1,2] presented numerical simulation studies on vibrational and acoustic responses of rectangular plates in thermal environment considering the inherent material damping property....
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TL;DR: In this article, the authors presented the VIBRO-ACOUSTIC MODELING and ANALYSIS of UN-BAFFLed LAMINATED COMPOSITE FLAT PANELS SUBJECTED to HARMONIC POINT LOAD under VARIOUS support conditions.
Abstract: THIS ARTICLE PRESENTS THE VIBRO-ACOUSTIC MODELING AND ANALYSIS OF UN-BAFFLED LAMINATED COMPOSITE FLAT PANELS SUBJECTED TO HARMONIC POINT LOAD UNDER VARIOUS SUPPORT CONDITIONS. THE FREQUENCY VALUES OF THE PANEL ARE OBTAINED BY USING SIMULATION MODEL THROUGH THE COMMER-CIAL FINITE ELEMENT PACKAGE (ANSYS) VIA BATCH INPUT TECHNIQUE. INITIALLY, THE RATE OF CONVERGENCE OF THE CURRENT SIMULATION RESULTS IS ESTABLISHED BY SOLVING DIFFERENT EXAMPLES UNDER VARIOUS EDGE SUP-PORTS. FURTHER, THE NATURAL FREQUENCIES AND CORRESPONDING MODES ARE COMPUTED AND COMPARED WITH AVAILABLE PUBLISHED AND EXPERIMENTALLY OBTAINED VALUES. THEN, THE MODAL VALUES ARE EXPORTED TO LMS VIRTUAL.LAB ENVIRONMENT FOR THE COMPUTATION OF ACOUSTIC RESPONSES OF THE VIBRATING LAMINATED PLATE STRUCTURE. FURTHER, AN INDIRECT BOUNDARY ELEMENT APPROACH HAS BEEN ADOPTED TO EXTRACT THE COUPLED VIBRO-ACOUSTIC RESPONSES. SUBSEQUENTLY, THE RADIATED SOUND POWER OF THE STRUCTURE AND THE SOUND PRESSURE LEVEL WITHIN THE ACOUSTIC MEDIUM ARE COMPUTED USING THE PRESENT SCHEME AND COMPARED WITH THE PUBLISHED NUMERICAL RESULTS AND IN-HOUSE EXPERIMENTAL DATA, RESPECTIVELY. FINALLY, A COMPREHENSIVE STUDY HAS BEEN PERFORMED TO HIGHLIGHT THE EFFECT OF DIFFERENT STRUCTURAL PARAMETERS (THICKNESS RATIO, ASPECT RATIO, MODULAR RATIO AND LAY-UP SCHEME), SUPPORT CONDITIONS AND THE COMPOSITE PROPERTIES ON THE ACOUSTIC RADIATION RESPONSES OF THE LAMINATED PLATE STRUCTURE.
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TL;DR: In this paper, an energy flow analysis (EFA) method is developed to predict the high-frequency response of beams in a thermal environment, which is a topic of concern in aerospace and automotive industries.
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01 Sep 2018
TL;DR: In this article, the vibration-induced acoustic responses of laminated composite flat panels subjected to harmonic mechanical excitation under uniform temperature load are investigated numerically, and the results show that the flat panels exhibit similar acoustic responses to the vibration induced acoustic response of the same type of flat panels.
Abstract: In this article, the vibration-induced acoustic responses of laminated composite flat panels subjected to harmonic mechanical excitation under uniform temperature load are investigated numerically....
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TL;DR: In this paper, the vibroacoustic responses of laminated composite curved panels subjected to harmonic point excitation in a combined temperature and moisture environment are investigated numerically using a novel higher-order finite-boundary element model.
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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
TL;DR: In this paper, two different models were developed to calculate the optimal support stiffness that minimizes the velocity response of homogeneous plates, based on the wave propagation at the edge and the Rayleigh-Ritz method.
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