Fundamental frequency of a cantilever composite cylindrical shell

Лопатин, А.В.; Морозов, Е.В.

doi:10.1016/j.compstruct.2014.09.038

Cited by 12 publications

(6 citation statements)

References 18 publications

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“…The number of circumferential waves in the modes generally decreases with the increasing thickness and l/r ratio conforming with the results presented in [46]. Once again, all second mode shapes are different for maximum ω 1 and ω 2 − ω 1 designs.…”

Section: Eigenfrequency Optimization For Cantilever Cylinderssupporting

confidence: 89%

“…The results for cantilever cylinders are presented in this subsection. Such structures can represent parts of aerospace structures such as space telescopes, hence their dynamic behavior is practically of interest [46]. Figure 4 shows the contour plots with the points of maximum values (red squares) for the first two normalized eigenfrequencies and their differences in the lamination parameter plane.…”

Section: Eigenfrequency Optimization For Cantilever Cylindersmentioning

confidence: 99%

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Design of Circular Composite Cylinders for Optimal Natural Frequencies

Serhat

2021

Materials

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This study concerns optimizing the eigenfrequencies of circular cylindrical laminates. The stiffness properties are described by lamination parameters to avoid potential solution dependency on the initial assumptions of the laminate configurations. In the lamination parameter plane, novel response contours are obtained for the first and second natural frequencies as well as their difference. The influence of cylinder length, radius, thickness, and boundary conditions on the responses is investigated. The lamination parameters yielding the maximum response values are determined, and the first two mode shapes are shown for the optimum points. The results demonstrate that the maximum fundamental frequency points of the laminated cylinders mostly lie at the inner lamination parameter domain, unlike the singly curved composite panels. In addition, the second eigenfrequency shows a nonconvex response surface containing multiple local maxima for several cases. Moreover, the frequency difference contours appear as highly irregular, which is unconventional for free vibration responses.

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Section: Eigenfrequency Optimization For Cantilever Cylinderssupporting

confidence: 89%

Section: Eigenfrequency Optimization For Cantilever Cylindersmentioning

confidence: 99%

Design of Circular Composite Cylinders for Optimal Natural Frequencies

Serhat

2021

Materials

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“…The design of composite structures requires the selection of appropriate values of certain control parameters that describe both the structure itself and the material that it is made from [ 1 , 2 ]. The number of composite layers and their stacking sequence are, among others, frequently used for tuning selected properties of composite structures [ 3 ] (e.g., desired vibration frequency spectrum [ 4 , 5 ], buckling behavior [ 6 ], or structure’s stiffness [ 7 ]). The values of the parameters that give the expected results are often determined through the optimization process [ 8 ], namely through repeated calculation of the so-called objective function, which is minimized in the space of varying parameters (e.g., lamination angles).…”

Section: Introductionmentioning

confidence: 99%

Identification of Mode Shapes of a Composite Cylinder Using Convolutional Neural Networks

Miller

Ziemiański

2021

Materials

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The aim of the following paper is to discuss a newly developed approach for the identification of vibration mode shapes of multilayer composite structures. To overcome the limitations of the approaches based on image analysis (two-dimensional structures, high spatial resolution of mode shapes description), convolutional neural networks (CNNs) are applied to create a three-dimensional mode shapes identification algorithm with a significantly reduced number of mode shape vector coordinates. The CNN-based procedure is accurate, effective, and robust to noisy input data. The appearance of local damage is not an obstacle. The change of the material and the occurrence of local material degradation do not affect the accuracy of the method. Moreover, the application of the proposed identification method allows identifying the material degradation occurrence.

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“…The wave propagation method was applied by Li [5], Zhang [6] and Iqbal et al [7]. Lopatin and Morozov [8] solved the problem of a cantilever composite cylindrical shell using Galerkin method to find the fundamental frequencies. In addition, Haar wavelet method was used by Xie et al [9] to analyse the free vibration of cylindrical shell based on Goldenveizer-Novozhilov shell theory.…”

Section: Introductionmentioning

confidence: 99%

Vibration of symmetrically layered angle-ply cylindrical shells filled with fluid

Daud

Viswanathan

2019

PLoS ONE

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Vibrational behaviour of symmetric angle-ply layered circular cylindrical shell filled with quiescent fluid is presented. The equations of motion of cylindrical shell in terms of stress and moment resultants are derived from the first order shear deformation theory. Irrotational of inviscid fluid are expressed as the wave equation. These two equations are coupled. Strain-displacement relations and stress-strain relations are adopted into the equations of motion to obtain the differential equations with displacements and rotational functions. A system of ordinary differential equation is obtained in one variable by assuming the functions in separable form. Spline of order three is applied to approximate the displacement and rotational functions, together with boundary conditions, to get a generalised eigenvalue problem. The eigenvalue problem is solved for eigen frequency parameter and associate eigenvectors of spline coefficients. The study of frequency parameters are analysed using the parameters the thickness ratio, length ratio, angle-ply, properties of material and number of layers under different boundary conditions.

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Fundamental frequency of a cantilever composite cylindrical shell

Cited by 12 publications

References 18 publications

Design of Circular Composite Cylinders for Optimal Natural Frequencies

Design of Circular Composite Cylinders for Optimal Natural Frequencies

Identification of Mode Shapes of a Composite Cylinder Using Convolutional Neural Networks

Vibration of symmetrically layered angle-ply cylindrical shells filled with fluid

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