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Proceedings of CAD'17, 2017, 374-378
From CAD Assemblies toward Knowledge-based Assemblies using an Intrinsic Knowledge-based Assembly Model
Abstract. CAD assembly models reduce to sets of B-Rep models, often solids, without explicit geometric relationships between them. When exported through STEP files, these files contain the assembly tree that structures the assembly and dependencies between solids that express the occurrence of each component through the assembly. The purpose of contribution is the proposition and implementation of an assembly model that is intrinsic, i.e., the CAD assembly tree is defined by a designer and can express some of it functional aspects only. This intrinsic model is used as basis to generate symbolic information as part of an ontology where the geometric properties associated with the intrinsic assembly model stand as elementary facts that populate the knowledge base connected to the CAD model. From this set of elementary facts, the inference engine part of our software architecture is equipped with inference rules. Triggering these rules enables the generation of new, higher level facts related to the assembly structure that relates to the functional structure of the assembly. These facts enrich the knowledge base so that it can be queried in accordance with the ontology set up.
Keywords. Assembly, ontologies, CAD models, knowledge modeling, B-Rep models, RDF