 Centre National de la Recherche Scientifique  Institut National Polytechnique de Grenoble  Université Joseph Fourier Laboratoire G-SCOP 46, av Félix.

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 Centre National de la Recherche Scientifique  Institut National Polytechnique de Grenoble  Université Joseph Fourier Laboratoire G-SCOP 46, av Félix Viallet Grenoble Cedex ROMMA Task 1 Geometric Model Processing Status Briefing Ahmad Shahwan - Gilles Foucault - Jean-Claude Léon G-SCOP Laboratory Université de Grenoble, Grenoble-INP March 2011

Introduction A PhD thesis in participation to ROMMA Project. The ultimate goal is to identify components’ funtional designation given the solid model of a product. Subtasks –Geometric analysis of the model. –Reasoning and inference.

Introduction Input: the solid model of a product (its DMU). Output: the same model, now annotated with components functional designations. Task 1

Conventional Interfaces A Conventional Interface between two neighboring solids describe the geometrical interaction between them. They can be either of the following: –Interference, –Contact, or –Clearance.

Conventional Interfaces Example: A cap-screw Interference Clearance Contact

The Identification Process 1.Models are analysed geometrically to obtain Conventional Interfaces between solids. 2.Conventional Interface Graph (CIG) is built as the data structure upon which the reasoning will be done. 3.The inference of functional designation and kinematic classes is accomplished based on hypotheses and reference states.

The Identification Process Example: Cap-screw. Solid ModelCIG Annotated Model

Geometric Analysis Detection of conventional interfaces between components. We consider DMUs to be presented as B-Reps in a STEP format file. Tools: OpenCASCADE development platform. Basic algorithms have been sketched so far based on bounding boxes and Boolean operations to detect interaction zones. Efficient and robust algorithms are to be developed: –Exploiting the canonical nature of functional surfaces, –Using octrees… The output of this phase is the CIG.

Reasoning and Inference Reference States –The product is mechanically isolated; no external forces. –No internal mobility in the general case. Dualities –Geometry/Force –Geometry/Mobility Mobility classes are inferred –Structures;One mobility class. –Mechanisms;Two or more mobility classes. User Interaction may be required to guide the reasoning. Iterative process.

Reasoning and Inference Example: Threaded connection.

Semantic Annotations Based on the result of our analysis and reasoning, components are classified according to their functional designation into a comprehensive taxonomy. Preliminary ontology is sketched using OWL to this end. Methods of augmenting the models with such semantic annotation are suggested in [1].

Conclusions Current work motivates the reasoning upon component geometric interaction to infer functional and kinematic properties. Future work –More efficient and robust algorithms is to be developed exploiting the prevailing features of product models. –Data structures. –Continue formalizing inference rules.

Bibliography 1.G. Foucault, A. Shahwan, J-C. Léon, & L. Fine. What is the Content of a DMU? Analysis and Proposal of Improvements. In Proc. AIP- PRIMECA, La Plagne France, March A. Shahwan, G. Foucault, J-C. Léon, & L. Fine. Towards Automated Identification of Functional Designations of Components Based on Geometric Analysis of a DMU. In Proc. GTMG, Grenoble France, March 2011.

Thanks