A unified analytical approach is applied to investigate the vibrational behavior of grid-stiffened cylindrical shells with different\nboundary conditions. A smeared method is employed to superimpose the stiffness contribution of the stiffeners with those of shell\nin order to obtain the equivalent stiffness parameters of the whole panel. Theoretical formulation is established based on Sanders�\nthin shell theory. The modal forms are assumed to have the axial dependency in the form of Fourier series whose derivatives\nare legitimized using Stoke�s transformation. A 3D finite element model is also built using ABAQUS software which takes into\nconsideration the exact geometric configuration of the stiffeners and the shell.The achievements fromthe two types of analyses are\ncompared with each other and good agreement has been obtained. The Influences of variations in shell geometrical parameters,\nboundary condition, and changes in the cross stiffeners angle on the natural frequencies are studied. The results obtained are\nnovel and can be used as a benchmark for further studies. The simplicity and the capability of the present method are also\ndiscussed.
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