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Atténuation vibratoire non-linéaire de structures modales creuses par ajout de matériaux granulaires

Abstract : The use of granular material in industrial structures to reduce vibration levels is an alternative toviscoelastic surfacing, which is highly dependent on temperature conditions. For the naval and aeronauticalindustry, the challenge is to improve reliability and comfort. The levels of interaction between the grainsdepend on the control parameters (acceleration level), but also on the characteristics of the constituentmaterials of the grains, the moisture content of the surrounding fluid, the geometry and dimensions of thegrains, as well as their containment conditions.For a given acceleration, independent of the point of structure, the relevance of the choice of a granularmaterial with respect to the same non-deformable mass is demonstrated by the study of the vibration of a rigidcavity mounted on an oscillator partially filled. The parametric variations of the types of confinement in thecavity as well as the constituent material of the grains make it possible to extract the influent parameters inthe energy dissipation. The development of an analytical model with localized constants allows to simulate theenergy dissipated by the system via a reduced number of coefficients representing the vibratory dynamics ofthe granular matter. The comparison of this model with experiments makes it possible to validate itseffectiveness and its predictive character in the dissipation of the vibratory energy of a dynamic system.For a modal structure, where the acceleration level is dependent on the point of the structure, theoptimization of the grain cluster positioning is shown.
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  • HAL Id : tel-02073106, version 1

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Antoine Sternberger. Atténuation vibratoire non-linéaire de structures modales creuses par ajout de matériaux granulaires. Vibrations [physics.class-ph]. Université du Maine, 2018. Français. ⟨NNT : 2018LEMA1018⟩. ⟨tel-02073106⟩

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