Prédiction par essais virtuels de l'amortissement dans les structures spatiales

Abstract : In the context of a significant cost reduction in the design of space launchers, it is on crucial to control all the factors involved in the dimensionning process. The decrease in mass is compensated by an increase in stiffness and results in a decrease of damping, which is the parameter that determines the level of the dynamic response. At the present time, the damping is taken into account in a global model and most often identified on the final structure. The objective of this work is to improve the launcher design process by introducing the capability to predict damping a priori. In order to do that, the idea is to develop a database containing the dissipation due to the materials and the dissipation relative to the joints in the launcher for each type and each level of solicitation ... Damping in materials is relatively well-known in the case of the composites which make up the launcher. Therefore, the challenge is the prediction of the damping in the joints where the dissipations can be very important. The experimental approaches are expensive and complex to implement, that is why this work is based on a finite element computation of the joints. This type of simulations is beyond the reach of standard industrial computing codes ans has needed the development of specific parallel computationnal code based on the LATIN method. The robustness of the numerical tool has been studied and its results validated from experimental values obtained in a previous study. Finally, the computation of different joints of the launcher has been done as well as the methodology for integrating these results in the design process of Ariane.
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https://tel.archives-ouvertes.fr/tel-00422291
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Submitted on : Tuesday, October 6, 2009 - 2:36:12 PM
Last modification on : Friday, May 17, 2019 - 1:23:43 AM
Long-term archiving on : Tuesday, June 15, 2010 - 9:40:12 PM

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  • HAL Id : tel-00422291, version 1

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Alain Caignot. Prédiction par essais virtuels de l'amortissement dans les structures spatiales. Mécanique [physics.med-ph]. École normale supérieure de Cachan - ENS Cachan, 2009. Français. ⟨tel-00422291⟩

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