The Experts below are selected from a list of 2751 Experts worldwide ranked by ideXlab platform
K Y Lam - One of the best experts on this subject based on the ideXlab platform.
-
generalized differential quadrature for free vibration of rotating composite laminated conical shell with various boundary conditions
International Journal of Mechanical Sciences, 2003Co-Authors: K Y LamAbstract:By using the generalized differential quadrature (GDQ) method, this paper presents the orthotropic influence of composite materials on frequency characteristics for a rotating thin truncated circular symmetrical cross-ply laminated composite conical shell with different boundary conditions. The present governing equations of free vibration include the effects of initial hoop tension and the centrifugal and Coriolis accelerations due to rotation. Frequency characteristics are obtained to study in detail the orthotropic influences. Effects of boundary condition, rotating speed, Circumferential Wave number and geometric property are also discussed. To ensure the accuracy of the present results by the GDQ method, comparisons are made with those available in open literature and very good agreements are achieved.
-
frequency characteristics of a thin rotating cylindrical shell using the generalized differential quadrature method
International Journal of Mechanical Sciences, 1998Co-Authors: Li Hua, K Y LamAbstract:Abstract In this paper, the generalized differential quadrature (GDQ) method is used for the first time to study the effects of boundary conditions on the frequency characteristics of a thin rotating cylindrical shell. The present analysis is based on Love-type shell theory and the governing equations of motion include the effects of initial hoop tension and the centrifugal and coriolis accelerations due to rotation. The displacement field is expressed as a product of unknown smooth continuous functions in the meridional direction and trigonometric functions along the Circumferential direction so that the three-dimensional dynamic problem may be transformed mathematically into a one-dimensional problem. Based on this approach, the results are obtained for the effects of the boundary conditions on the frequency characteristics at different Circumferential Wave numbers and rotating speeds and various geometric properties; the effect of rotating speed on the relationship between frequency parameter and Circumferential Wave number is also discussed. To validate the accuracy and efficiency of the GDQ method, the results obtained are compared with those in the literature and very good agreement is achieved.
M Shatalov - One of the best experts on this subject based on the ideXlab platform.
-
progress in the analysis of non axisymmetric Wave propagation in a homogeneous solid circular cylinder of a piezoelectric transversely isotropic material
Physics Procedia, 2010Co-Authors: A G Every, Alfred Sevidzem Yenwongfai, M ShatalovAbstract:Abstract Non-axisymmetric Waves in a free homogeneous piezoelectric cylinder of transversely isotropic material with axial polarization are investigated on the basis of the linear theory of elasticity and linear electromechanical coupling. The solution of the three dimensional equations of motion and quasi-electrostatic equation is given in terms of seven mechanical and three electric potentials. The characteristic equations are obtained through the application of the mechanical and two types of electric boundary conditions at the surface of the cylinder. A convenient method of calculating dispersion curves and phase velocities is discussed, and resulting curves are presented for propagating and evanescent Waves for the piezoelectric ceramic material PZT-4 for non-axisymmetric modes of Circumferential Wave number m = 1 . It is observed that the dispersion curves are sensitive to the type of the imposed boundary conditions as well as to the strength of the electromechanical coupling.
-
analysis of non axisymmetric Wave propagation in a homogeneous piezoelectric solid circular cylinder of transversely isotropic material
International Journal of Solids and Structures, 2009Co-Authors: A G Every, M Shatalov, Alfred Sevidzem YenwongfaiAbstract:A study concerning the propagation of free non-axisymmetric Waves in a homogeneous piezoelectric cylinder of transversely isotropic material with axial polarization is carried out on the basis of the linear theory of elasticity and linear electro-mechanical coupling. The solution of the three dimensional equations of motion and quasi-electrostatic equation is given in terms of seven mechanical and three electric potentials. The characteristic equations are obtained by the application of the mechanical and two types of electric boundary conditions at the surface of the piezoelectric cylinder. A novel method of displaying dispersion curves is described in the paper and the resulting dispersion curves are presented for propagating and evanescent Waves for PZT-4 and PZT-7A piezoelectric ceramics for Circumferential Wave numbers m = 1, 2, and 3. It is observed that the dispersion curves are sensitive to the type of the imposed boundary conditions as well as to the measure of the electro-mechanical coupling of the material.
Alfred Sevidzem Yenwongfai - One of the best experts on this subject based on the ideXlab platform.
-
progress in the analysis of non axisymmetric Wave propagation in a homogeneous solid circular cylinder of a piezoelectric transversely isotropic material
Physics Procedia, 2010Co-Authors: A G Every, Alfred Sevidzem Yenwongfai, M ShatalovAbstract:Abstract Non-axisymmetric Waves in a free homogeneous piezoelectric cylinder of transversely isotropic material with axial polarization are investigated on the basis of the linear theory of elasticity and linear electromechanical coupling. The solution of the three dimensional equations of motion and quasi-electrostatic equation is given in terms of seven mechanical and three electric potentials. The characteristic equations are obtained through the application of the mechanical and two types of electric boundary conditions at the surface of the cylinder. A convenient method of calculating dispersion curves and phase velocities is discussed, and resulting curves are presented for propagating and evanescent Waves for the piezoelectric ceramic material PZT-4 for non-axisymmetric modes of Circumferential Wave number m = 1 . It is observed that the dispersion curves are sensitive to the type of the imposed boundary conditions as well as to the strength of the electromechanical coupling.
-
analysis of non axisymmetric Wave propagation in a homogeneous piezoelectric solid circular cylinder of transversely isotropic material
International Journal of Solids and Structures, 2009Co-Authors: A G Every, M Shatalov, Alfred Sevidzem YenwongfaiAbstract:A study concerning the propagation of free non-axisymmetric Waves in a homogeneous piezoelectric cylinder of transversely isotropic material with axial polarization is carried out on the basis of the linear theory of elasticity and linear electro-mechanical coupling. The solution of the three dimensional equations of motion and quasi-electrostatic equation is given in terms of seven mechanical and three electric potentials. The characteristic equations are obtained by the application of the mechanical and two types of electric boundary conditions at the surface of the piezoelectric cylinder. A novel method of displaying dispersion curves is described in the paper and the resulting dispersion curves are presented for propagating and evanescent Waves for PZT-4 and PZT-7A piezoelectric ceramics for Circumferential Wave numbers m = 1, 2, and 3. It is observed that the dispersion curves are sensitive to the type of the imposed boundary conditions as well as to the measure of the electro-mechanical coupling of the material.
T P Leung - One of the best experts on this subject based on the ideXlab platform.
-
free vibration of a laminated composite circular cylindrical shell partially filled with fluid
Composites Part B-engineering, 1997Co-Authors: L H Yam, T P LeungAbstract:Free vibrations of partially fluid-filled laminated composite circular cylindrical shells including transverse shear deformation are investigated using a semi-analytical procedure. In this approach, displacements and rotations of the shell and the dynamic pressure of the fluid are modelled by Fourier series and finite elements in the Circumferential and axial directions, respectively, whereas the dynamic pressure of the fluid is expanded as a power series in the radial direction. The coupling between symmetric and antisymmetric modes is taken into account in the formulation. Numerical examples are given for free vibrations of partially fluid-filled laminated composite circular cylindrical shells with various boundary conditions. Parametric studies including Circumferential Wave number, fluid depth, thickness to mean radius ratio, length to mean radius ratio and boundary condition are carried out.
Seongcheol Lee - One of the best experts on this subject based on the ideXlab platform.
-
hydroelastic vibration of a liquid filled circular cylindrical shell
Computers & Structures, 1998Co-Authors: Kyeonghoon Jeong, Seongcheol LeeAbstract:Abstract An analytical method for hydroelastic vibration of a partially liquid-filled cylindrical shell with arbitrary classical boundary conditions was developed by means of the finite Fourier transform and the Fourier series expansion based on Sanders' shell theory. To demonstrate the validity and accuracy of the analytical method, the finite element analyses were performed for partially liquid-filled circular cylindrical shell with clamped-free and with clamped-clamped boundary conditions. Evaluation of the results showed excellent agreement between the analytical method and the finite element analyses. In addition, it was found that the variation of the normalized natural frequencies to the filling ratio depended on the axial mode number and Circumferential Wave number. The normalized natural frequency was defined as the natural frequency of a specific vibrational mode of liquid-filled cylindrical shell divided by the natural frequency of the identical vibrational mode of empty cylindrical shell. The analytical results showed that the number of transition plateaus of the normalized natural frequencies was identical to that of axial nodal points of the shell.