چكيده لاتين :
In this investigation Rayleigh-Ritz variational method has been applied to determine the least
natural frequency coefficient for the title problem. Classical plate theory assumptions have been
used to calculate strain energy and kinetic energy. Coordinate functions are combination of
polynomials which satisfy boundary conditions at the outer boundary and trigonometric terms. In
the second part of this study ABAQUS software is used to compute vibration natural frequency for
some special combinations of geometrical and mechanical parameters. Then results of Rayleigh-
Ritz method have been obtained for the mentioned special cases. It can be seen that the agreement
between them is acceptable.
