Abstract
This work discusses an efficient numerical approximation technique that called the differential quadrature method. The free vibration problems of annular plates are numerically formulated using the modified differential quadrature method and differential quadrature method. The modified differential quadrature method does not use the δ method. Appropriate boundary conditions accompany the modified differential quadrature method to transform the partial differential equation of an annular plate into a discrete eigenvalue problem. The effect of δ on the accuracy variation of calculated natural frequencies are investigated. Numerical results indicated that the accuracy of the calculated results is improved significantly by employing the modified differential quadrature method.
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