Techno Press

Steel and Composite Structures   Volume 28, Number 6, September25 2018, pages 655-670
A coupled Ritz-finite element method for free vibration of rectangular thin and thick plates with general boundary conditions
Seyyed A. Eftekhari

Abstract     [Full Text]
    A coupled method, that combines the Ritz method and the finite element (FE) method, is proposed to solve the vibration problem of rectangular thin and thick plates with general boundary conditions. The eigenvalue partial differential equation(s) of the plate is (are) first reduced to a set of eigenvalue ordinary differential equations by the application of the Ritz method. The resulting eigenvalue differential equations are then reduced to an eigenvalue algebraic equation system using the finite element method. The natural boundary conditions of the plate problem including the free edge and free corner boundary conditions are also implemented in a simple and accurate manner. Various boundary conditions including simply supported, clamped and free boundary conditions are considered. Comparisons with existing numerical and analytical solutions show that the proposed mixed method can produce highly accurate results for the problems considered using a small number of Ritz terms and finite elements. The proposed mixed Ritz-FE formulation is also compared with the mixed FE-Ritz formulation which has been recently proposed by the present author and his co-author. It is found that the proposed mixed Ritz-FE formulation is more efficient than the mixed FE-Ritz formulation for free vibration analysis of rectangular plates with Levy-type boundary conditions.
Key Words
    Ritz method; higher order FEM; rectangular thin plates; rectangular thick plates; free edges; free corners; Levy-type boundary conditions
Faculty of Engineering in Eastern Guilan, University of Guilan, Guilan, Iran.

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