The knowledge preservation of design project is an important issue for high technological industry. A general framework for managing knowledge pertaining to design projects is proposed. The objective is to allow preserving relevant information to be used later, thanks to a product design project memory. We introduce a generic platform-independent model that fits requirements of project memory management; this platform is based on UML generic models. We describe the original implementation over object-relational technology in a multi-tier architecture; model transformation based on Model Driven Architecture (MDA) is developed. We present some ontology concepts, three mechanisms for exportation database under Oracle to platform dedicated for representation and exploitation Knowledge, Protégé platform. Finally, we discuss the benefits of ontology engineering for Project Memory management.