Ontological Assembly Representation

Reduction gearbox assembly and connection structure. The gearbox consists of 3 parts (lower housing, upper housing and 4 screws) and 2 sub-assemblies (input and output axial assembly that contains bearings, shaft, gear and key parts). Parts could be connected either in "fixed connection" (fc) or "movable connection" (mc).

Reduction gearbox ontology represented in Stanford Protégé. This ontological representation fully captures parts assembly relation (class hierarchy) and parts connection (feature and association).


In the broad field of Product Development, Product Lifecycle Management (PLM) is of great importance to the design and manufacturing part throughout the whole process. The development of ontological assembly representation was initiated from several considerations concerning assembly representation for PLM. Ontological representation, due to its inherent advantages, can help achieve high interoperability level that enables efficient implementation of PLM and identify a common data structure to allow data exchange between platforms. There are several kinds of software that is able to perform ontology-based modeling and analysis, and Protégé is a commonly used and powerful tool in this area. To make this idea more clear, this report will choose a typical assembly case, namely a reduction gearbox, build the corresponding ontology and explore the ontology assembly model by using related plug-ins.