THE DYNAMIC STIFFNESS MATRIX OF THE FINITE ANNULAR PLATE ELEMENT

The dynamic deformation of harmonic vibration is used as the shape functions of thefinite annular plate element.and some integration difficulties related to the Bessel’sfunctions are solved in this paper.Then the dynamic stiffness matrix of the finite annularplate element is established in closed form and checked by the direct stiffness method.Thepaper has given wide converage for decomposing the dynamic matrix into the power seriesof frequency square.By utilizing the axial symmetry of annular,the modes withdifferent numbers of nodal diameters are separately treated Thus some terse and completeresults are obtained as the.foundation of structural characteristic analysis and dynamicresponse computation.