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K.R. Sivadas

Bio: K.R. Sivadas is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Isotropy & Shell (structure). The author has an hindex of 6, co-authored 6 publications receiving 95 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, the free vibration characteristics of orthotropic circular cylindrical shells are analyzed using Love's first approximation shell theory, and the effect of degree of orthotropy on natural frequencies of shells is also investigated.

23 citations

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TL;DR: In this paper, a semianalytical finite element is used for the investigation of vibration behavior of cantilever homogeneous isotropic circular cylindrical shells with variable thickness.

22 citations

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TL;DR: In this article, the effect of various geometric and material properties on natural frequencies of stiffened shells are investigated using two approaches: (i) with a discontinuous radius of curvature, i.e., the radius of curve varies in steps and (ii) continuous, but eccentric thickness.

22 citations

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TL;DR: In this article, the effect of various parameters on the natural frequencies, especially the lowest natural frequency, of cantilever conical shells with variable thickness, was analyzed using the Semianalytical finite element method.

19 citations

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TL;DR: In this article, a curved-semianalytical finite element is used to solve the problem of vibration analysis of shells of revolution, which includes the thickness normal strain and shear deformation.

15 citations


Cited by
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Journal ArticleDOI
Yegao Qu1, Yong Chen1, Xinhua Long1, Hongxing Hua1, Guang Meng1 
TL;DR: In this article, a modified variational method for dynamic analysis of ring-stiffened conical-cylindrical shells subjected to different boundary conditions is presented, which involves partitioning the stiffened shell into appropriate shell segments in order to accommodate the computing requirement of high-order vibration modes and responses.
Abstract: This work presents a modified variational method for dynamic analysis of ring-stiffened conical–cylindrical shells subjected to different boundary conditions. The method involves partitioning of the stiffened shell into appropriate shell segments in order to accommodate the computing requirement of high-order vibration modes and responses. All essential continuity constraints on segment interfaces are imposed by means of a modified variational principle and least-squares weighted residual method. Reissner-Naghdi's thin shell theory combined with the discrete element stiffener theory to consider the ring-stiffening effect is employed to formulate the theoretical model. Double mixed series, i.e., the Fourier series and Chebyshev orthogonal polynomials, are adopted as admissible displacement functions for each shell segment. To test the convergence, efficiency and accuracy of the present method, both free and forced vibrations of non-stiffened and stiffened shells are examined under different combinations of edge support conditions. Two types of external excitation forces are considered for the forced vibration analysis, i.e., the axisymmetric line force and concentrated point force. The numerical results obtained from the present method show good agreement with previously published results and those from the finite element program ANSYS. Effects of structural damping on the harmonic vibration responses of the stiffened conical–cylindrical–conical shell are also presented.

106 citations

Journal ArticleDOI
TL;DR: In this paper, an analytic method is presented to analyze free and forced vibration characteristics of ring-stiffened combined conical-cylindrical shells with arbitrary boundary conditions, e.g. classical and elastic ones.

77 citations

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TL;DR: In this article, an analytical procedure and closed-form vibration solutions with analytically determined coefficients for orthotropic circular cylindrical shells having classical boundary conditions are presented, based upon the Donnell-Mushtari shell theory.

77 citations