Study on energy dissipation pattern in vibrating fluid filled cylindrical shells with a constrained viscoelastic layer
TL;DR: In this article, the modal strain energy method is used to study the energy dissipation pattern in vibrating cylindrical shells with a viscoelastic damping layer, for various circumferential and axial modes.
About: This article is published in Computers & Structures.The article was published on 2000-05-15. It has received 13 citations till now. The article focuses on the topics: Viscoelasticity & Dissipation.
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193 citations
TL;DR: In this article, a finite element based on a discrete layer theory is employed to derive the equations of motion for the composite system and the effects of various parameters, such as material properties, thicknesses of constraining and damping layers, treatment areas and locations are discussed.
48 citations
TL;DR: In this article, an analytical model is developed and the discrete finite element method is adopted to investigate the vibration and damping characteristics of the sandwich orthotropic cylindrical shell system with an electrorheological (ER) layer and a constraining layer.
33 citations
TL;DR: In this article, the authors deal with the low frequency vibratory analysis of fluid-structure interactions in an elastic tank partially filled with an incompressible inviscid liquid.
30 citations
TL;DR: In this article, the authors apply the Havriliak-Negami model to study free vibrational and damping characteristics of an infinitely long viscoelastic thin circular cylindrical shell submerged in and filled with acoustic fluids.
Abstract: The novel features of the Havriliak-Negami model for dynamic description of viscoelastic material behavior along with the Donnell theory of shell motion are applied to study free vibrational and damping characteristics of an infinitely long viscoelastic thin circular cylindrical shell submerged in and filled with acoustic fluids. The analytical results are illustrated with numerical examples in which two fluid-filled shells of distinctive viscoelastic material properties are undergoing free vibrations in a surrounding ideal fluid medium. The natural frequencies and the associated modal loss factors as a function of the circumferential mode number at selected axial wave lengths and submergence conditions are numerically evaluated and discussed. The numerical results reveal the imperative influence of dynamic viscoelastic properties on the vibrational characteristics of the fluid-coupled system. They demonstrate an interesting correlation between the modal loss factor and the material loss factor in the vic...
13 citations
Cites methods from "Study on energy dissipation pattern..."
...More recently, Saravanan et al. (2000) used the modal strain energy method to study the energy dissipation pattern in vibrating cylindrical shells with a viscoelastic damping layer for various circumferential and axial modes....
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References
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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.
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.
542 citations
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.
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.)
319 citations
TL;DR: In this paper, the effects of the shear parameter on the frequency and loss factors for various geometric properties and boundary conditions are also discussed for cylindrical shells with different core to facing thickness and length to radius ratios.
80 citations
TL;DR: In this article, an analysis of axisymmetric and unsymmetric free vibrations of conical or cylindrical shells with various boundary conditions is presented, where Love's first-approximation shell theory, with transverse shear strain added, was used and solutions were obtained by Galerkin's method.
78 citations
TL;DR: In this paper, the authors present a solution de l'analyse de vibration and d'amortissement d'une coque cylindrique generale a plusieurs couches, composee d'un nombre arbitraire de couches viscoelastiques and elastiques d'Un materiau orthotrope, avec des conditions de simple supportage aux extremites.
Abstract: La premiere partie a presente la solution de l'analyse de vibration et d'amortissement d'une coque cylindrique generale a plusieurs couches, composee d'un nombre arbitraire de couches viscoelastiques et elastiques d'un materiau orthotrope, avec des conditions de simple supportage aux extremites. La solution a ete programmee sur ordinateur IBM 360 pour l'evaluation des frequences de resonance et les facteurs de perte associes pour toutes les familles de modes ayant les vibrations axisymetriques et non axisymetriques de l'enveloppe multicouches. Le cas d'enveloppes a 3, 5, et 7 couches alternativement elastiques et viscoelastiques a ete examine
51 citations