Wave Propagation in Layered Cylindrical Structures Using Finite Element and Wave Tracing Analysis

概要

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In this study, acceleration responses of layered cylindrical structures are obtained using finite element analysis (FEA) and wave tracing technique. The wave tracing technique implies a direct application of the wave propagation equation which includes propagating wave and its reflections at the interfaces due to effect of impedance differences in layered structure. Wave tracing clearly supported FEA results which had showed that interference between applied impact and reflected waves affects wave propagation both negatively and positively depending on material combinations of the structure. The study showed that structures made in order of high-low-high impedance materials reduce magnitude of acceleration responses compared to homogeneous structures made of only high impedance material when there is no interference. While structures made in the order of low-high-low impedance materials reduce magnitude of acceleration responses compared to homogeneous structures made of only low impedance material with and without the interference. Furthermore, FEA results showed that structures made of high-low-high impedance materials reduce high frequency accelerations compared to homogeneous high impedance material structures. These results were experimentally verified with the previously reported results.