Effects of junctions on the vibroacoustic behaviour of assembled structures - application to two beams connected by stiffness and damping distributions
Résumé
This communication is part of a study consisting in analyzing vibroacoustic comportment of assembled structures. The study is focused on a system of two beams partly overlapped and whose junction is modelled by a distribution of linear stiffeners and dampers so that flexural and compressional motions are coupled. The model is constructed from a modal decomposition based on the uncoupled free/free beams and is solved in the frequency domain by a standard inversion method. The approach is validated by comparison with reference results from finite element simulations. The importance of modal coupling terms on the vibroacoustic behaviour of the assembly are then analyzed. The results obtained show the junction as a signature that can be linked to impact on vibroacoustic indicators of the assembled structure. Several examples of junctions will be shown, in order to show the sensitivity of some parameters like the covering area, the chosen stiffness distribution, the value of damping, etc.
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