SPECTRAL FINITE ELEMENT MODELING OF WAVE PROPAGATION IN SANDWICH PLATE-ROWS WITH PERIODIC HONEYCOMB CORE

Abstract eng:
The wave propagation in sandwich plates with cellular core is analyzed and controlled. Honeycomb core materials of different geometry placed periodically along the structure introduce the impedance mismatch necessary to obstruct the propagation of waves over specific frequency bands (stop bands). The location and the extension of the stop bands can be optimized by proper selection of the geometrical and mechanical properties of the core. A Spectral-Finite-Element Model (SFEM) has been developed. The model employs dynamic shape functions which allow for accurately predicting the behavior of the structure with a reduced number of elements. The theory for periodic structures and a transfer matrix formulation have been employed to predict the behavior of large plate rows considering the analysis of the single periodic cell. The results demonstrate the simplicity and the effectiveness of the proposed treatment whereby the transmission of waves and the vibration over specified frequency bands can be significantly reduced without additional passive or active control devices and without compromising the size and the weight of the structure.

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