Effects of core geometry on the vibro-acoustic behaviour of fibre reinforced corrugated core sandwich panels

In this study, the vibro-acoustic behaviour of sandwich bio-panels is investigated. An arc-and-tangent core profile geometry is adopted for ease of manufacturing. Effects of core geometry radius and orientation on the overall transmission loss are studied. Experimental modal analyses are carried out on flat samples to determine the material dynamic properties and to update the numerical models. A fully coupled Finite Element-Indirect Boundary Element model is developed to evaluate the acoustic transmission characteristics of the panels. It is found that by appropriate design of the corrugated core geometry it is possible to substantially attenuate the travelling bending waves in the sandwich structure (predominant path of the acoustic transmission), which may significantly reduce the total transmitted sound level.

ISBN:9788888785332

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