Idéalisation d'assemblages CAO pour l'analyse EF de structures

Flavien Boussuge 1, 2
1 IMAGINE - Intuitive Modeling and Animation for Interactive Graphics & Narrative Environments
Inria Grenoble - Rhône-Alpes, LJK - Laboratoire Jean Kuntzmann, INPG - Institut National Polytechnique de Grenoble
Abstract : Aeronautical companies face a significant increase in complexity and size of simulation models especially at the level of assemblies, sub-systems of their complex products. Pre-processing of Computer Aided Design (CAD) models derived from the digital representation of sub-systems, i.e., Digital Mock-Ups (DMUs), into Finite Elements Analysis (FEA) models requires usually many tedious manual tasks of model preparation and shape transformations, in particular when idealizations of components or assemblies have to be produced. Therefore, the purpose of this thesis is to make a contribution to the robust automation of the time-consuming sequences of assembly preparation processes. Starting from an enriched DMU with geometrical interfaces between components and functional properties, the proposed approach takes DMU enrichment to the next level by structuring components' shapes. This approach extracts a construction graph from B-Rep CAD models so that the corresponding generative processes provide meaningful volume primitives for idealization application. These primitives form the basis of a morphological analysis which identifies the sub-domains for idealization in the components' shapes and their associated geometric interfaces. Subsequently, models of components as well as their geometric representation get structured in an enriched DMU which is contextualized for FEA application. Based on this enriched DMU, simulation objectives can be used to specify geometric operators that can be robustly applied to automate components and interfaces shape transformations during an assembly preparation process. A new idealization process of standalone components is proposed while benefiting from the decomposition into sub-domains and their geometric interfaces provided by the morphological analysis of the component. Interfaces between sub-domains are evaluated to robustly process the connections between the idealized sub-domains leading to the complete idealization of the component. Finally, the scope of the idealization process is extended to shape transformations at the assembly level and evolves toward a methodology of assembly pre-processing. This methodology aims at exploiting the functional information of the assembly and interfaces between components to perform transformations of groups of components and assembly idealizations. In order to prove the applicability of the proposed methodology, corresponding operators are developed and successfully tested on industrial use-cases.
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Flavien Boussuge. Idéalisation d'assemblages CAO pour l'analyse EF de structures. Autre [cs.OH]. Université de Grenoble, 2014. Français. ⟨NNT : 2014GRENM025⟩. ⟨tel-01071560⟩

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