Abstract
A thin cylindrical shell is considered, stiffened axially by equi-pitched, identical stringers and circumferentially by equi-pitched, identical frames. Generality of strigner and frame section is allowed. The structure is analyzed as a two-dimensional periodic structure by using wave propagation techniques in conjunction with the hierarchical finite element method. Results are presented in the form of phase-constant surfaces plotted against frequency. It is shown that free wave-motion can propagate in the infinite structure from zero frequency. A small frequency band has been identified in which predominantly flexural waves cannot propagate. Some experiments, which have been performed on a one-quarter scale fuselage model, confirm the main findings of the theoretical analysis.
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