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

doi:10.1177/1099636211400129

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

Journal Article•DOI•

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

P. Jeyaraj¹, Chandramouli Padmanabhan², N. Ganesan²•Institutions (2)

VIT University¹, Indian Institute of Technology Madras²

12 Jul 2011-Journal of Sandwich Structures and Materials (SAGE Publications)-Vol. 13, Iss: 5, pp 509-537

TL;DR: In this paper, the authors present numerical simulation studies on the vibration and acoustic response characteristics of a multilayered viscoelastic sandwich plate in a thermal environment, where the critical buckling temperature and vibration response were obtained using finite element method while sound radiation characteristics are obtained using boundary element method.

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Abstract: 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.

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Journal Article•DOI•

Vibro-Acoustic Formulation of Elastically Restrained Shear Deformable Orthotropic Plates Using a Simple Shear Deformation Theory

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T.Y. Kam, A. Nayan

31 Dec 2014-Modern Mechanical Engineering

4 citations

Journal Article•DOI•

Vibro-acoustic analysis of laminated composite plate structure using structure-dependent radiation modes: An experimental validation

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Nitin Sharma¹, Trupti Ranjan Mahapatra¹, Subrata Kumar Panda²•Institutions (2)

KIIT University¹, National Institute of Technology, Rourkela²

01 Oct 2018-Scientia Iranica

TL;DR: In this article, the acoustic radiation responses of the layered composite flat panel in an infinite rigid baffle under the influence of harmonic point load and various support conditions are investigated numerically.

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3 citations

Cites methods from "Vibro-acoustic behavior of a multil..."

...In accordance with the rule of thumb for the acoustic analysis of structures [6,28], six elements per unit wavelength must be used to predict the responses accurately....
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...In addition, it was noted that some coupled FEM-BEM (boundary element method) approach was employed to investigate the vibration and acoustic characteristics of the laminated composite plates [25-28]....
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Book Chapter•DOI•

Finite Element Analysis of Buckling, Free Vibration and Flexure of Clamped Laminated Composite Plates in Variable Thermal Environment

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Ranjan K. Behera, Nitin Sharma, S. K. Parida

01 Jan 2020

TL;DR: In this paper, the buckling analysis, free vibration, and flexure of clamped laminated composite plates (CLCP) in the variable thermal environment through finite elements (FE) method is presented.

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Abstract: This paper represents the buckling analysis, free vibration, and flexure of clamped laminated composite plates (CLCP) in the variable thermal environment through finite elements (FE) method. The midplane kinematics of CLCP has been simulated applying commercial accessible FE tool (ABAQUS) in the outline of the FSDT (first-order shear deformation theory). Firstly, validation of the current problem is accomplished by equating the current buckling temperature and natural frequenc values with the existing benchmark results. Then, the effect of variable thermal environment on the buckling temperature, natural frequencies, and flexural analysis of CLCP are compared by solving suitable numerical problems and their results are represented graphically and in the form of tables.

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2 citations

Journal Article•DOI•

Thermoviscoelastic dynamic response for a composite material thin narrow strip

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Hong-Liang Dai¹, Li-Li Qi¹, Hai-Bo Liu¹•Institutions (1)

Hunan University¹

15 Feb 2015-Journal of Mechanical Science and Technology

TL;DR: Based on von Karman nonlinear strain-displacement relationships and classical thin plate theory, a list of nonlinear dynamic equilibrium equations for a viscoelastic composite material thin narrow strip under thermal and mechanic loads are deduced in this paper.

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Abstract: Based on von Karman nonlinear strain-displacement relationships and classical thin plate theory, a list of nonlinear dynamic equilibrium equations for a viscoelastic composite material thin narrow strip under thermal and mechanic loads are deduced. According to the material constitutive relationship and the relaxation modulus in the form of the Prony series, combing with the Newmark method and the Newton-cotes integration method, a new numerical algorithm for direct solving the whole problem in the time domain is established. By applying this numerical algorithm, the viscoelastic composite material thin narrow strip as the research subject is analyzed systematically, and its rich dynamical behaviors are revealed comprehensively. To verify the accuracy of the present work, a comparison is made with previously published results. Finally, the viscoelastic composite material thin narrow strip under harmonic excitation load and impact load are discussed in detail, and many valuable thermoviscoelastic dynamic characteristics are revealed.

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2 citations

Cites background from "Vibro-acoustic behavior of a multil..."

...[31] presented numerical simulation studies on the vibration and acoustic response characteristics of a multilayered viscoelastic sand-...
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Journal Article•DOI•

The influence of geometric imperfections on post-buckling behavior and free vibrations of a fiber-reinforced composite laminated plate under thermal loading

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Di Wang, Jizhuang Hui, Wei Cao, Yu Dong Yang, Yipin Yipin Wan, Hao Zuo, Bo Zhang - Show less +3 more

01 Dec 2022-Composite Structures

TL;DR: In this article , the post-buckling equilibrium paths and natural characteristics of fiber-reinforced composite laminated plates with different imperfections under thermal load are studied based on the Incremental Von Karman nonlinear relationship, Third-order shear deformation plate theory and Hamilton's principle.

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1 citations

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References

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Book•

Fourier Acoustics: Sound Radiation and Nearfield Acoustical Holography

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Earl G. Williams, J. Adin Mann

30 Jun 1999

TL;DR: The Inverse Problem: Cylindrical NAH. as discussed by the authors The Inverse problem: Planar NAH and the Inverse NP-hardness of planar plane waves.

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Abstract: Preface. Fourier Transforms & Special Functions. Plane Waves. The Inverse Problem: Planar NAH. Cylindrical Waves. The Inverse Problem: Cylindrical NAH. Spherical Waves. Spherical NAH. Green Functions & the Helmholtz Integral. Index.

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1,032 citations

"Vibro-acoustic behavior of a multil..." refers background or methods in this paper

...To understand why the concept of replacing the actual velocity distribution with a spatially averaged uniform rms velocity works, the alternative expression for sound power (using Rayleigh’s Integral) as shown by Williams [18] is considered: ! ð Þ 1⁄4 0ck 2 4 Z Z...
[...]
...To understand why the concept of replacing the actual velocity distribution with a spatially averaged uniform rms velocity works, the alternative expression for sound power (using Rayleigh’s Integral) as shown by Williams [18] is considered: !ð Þ ¼ 0ck 2 4 Z Z S Z Z S _U x0, y0ð Þ sin kRð Þ kR U x, yð Þdsds0 ð34Þ In the above equation R ¼ ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi x x0ð Þ2þ y y0ð Þ2 q where x yð Þ and x0 y0ð Þ are co-ordinates of two different point on the plate, S or S’ represents the plate area, _U is the normal velocity of the plate (assumed to be harmonic), and _U is its complex conjugate....
[...]
...Temperature-dependant material properties of visco-elastic core materials EC2216 and DYAD 606 [18]: (a) shear modulus, (b) material loss factor....
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Journal Article•DOI•

Finite Element Prediction of Damping in Structures with Constrained Viscoelastic Layers

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Conor D. Johnson, David A. Kienholz

01 Sep 1982-AIAA Journal

TL;DR: In this article, an efficient method for finite element modeling of three-layer laminates containing a viscoelastic layer is described, and modal damping ratios are estimated from undamped normal mode results by means of the modal strain energy method.

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Abstract: An efficient method is described for finite element modelling of three-layer laminates containing a viscoelastic layer. Modal damping ratios are estimated from undamped normal mode results by means of the modal strain energy method. Comparisons are given between results obtained by the MSE method implemented in NASTRAN, by various exact solutions for approximate governing differential equations, and by experiment. Results are in terms of frequencies, modal damping ratios, and mechanical admittances for simple beams, plates, and rings. Application of the finite element -- MSE method in design of integrally damped structures is discussed.

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542 citations

"Vibro-acoustic behavior of a multil..." refers methods in this paper

...Johnson and Kienholz [2] described finite element based modal strain energy method to obtain modal damping ratios....
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Book•

The Finite Element Method in Heat Transfer Analysis

[...]

Roland W. Lewis

11 Jul 1996

TL;DR: In this article, the authors present a time-stepping method for convective heat transfer with phase change problems and linear Steady State Problems, and a non-linear heat-conduction analysis.

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Abstract: Conduction Heat Transfer and Formulation. Linear Steady State Problems. Time Stepping Methods for Heat Transfer. Non--Linear Heat Conduction Analysis. Phase Change Problems----Solidification and Melting. Convective Heat Transfer. Nomenclature. Index.

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329 citations

Journal Article•DOI•

Loss Factors of Viscoelastic Systems in Terms of Energy Concepts

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Eric E. Ungar, Edward M. Kerwin

01 May 1962-Journal of the Acoustical Society of America

TL;DR: In this article, the authors re-examined the definition of loss factor in terms of energy quantities, particularly as it applies to composite viscoelastic systems, and proposed simple relations which express the loss factors of series-parallel arrays of massless VRSs.

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Abstract: The definition of loss factor in terms of energy quantities is re‐examined, particularly as it applies to composite viscoelastic systems. A restatement of this definition in terms of a corresponding viscoelastic spring is used to show that this definition is extremely useful for massless (ideal viscoelastic spring) systems, but may be applied unambiguously to spring systems with a single attached mass only at resonance. Simple relations are presented which express the loss factors of series‐parallel arrays of massless viscoelastic springs in terms of properties of the individual components. Implications of these relations in damping of composite structures are discussed. (This work was supported in part by the Aeronautical Systems Division, U. S. Air Force.)

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319 citations

"Vibro-acoustic behavior of a multil..." refers background in this paper

...Ungar and Kerwin [1] were the earlier researchers who found that the modal loss factor can be obtained by calculating the ratio of the dissipating energy to the total structural energy, using modal strain energy method....
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Book•

Mechanics of Composite Structural Elements

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Holm Altenbach, Johannes Altenbach, Wolfgang Kissing

05 Feb 2004

261 citations