Research On Functional Knowledge Representation For Home Appliances Domain Based On Ontology

With the rapid development of home appliances and the growing global market competitions, it has been a pressing problem to improve the level of modern manufacturing technology and management. Especially, it is of great urgency to manage in product life cycle.Product life cycle management involves a lot of core knowledge of enterprise, including geometry data of products and much knowledge of product design and development. Whether the knowledge can be effectively shared in the various departments in the enterprise determines whether product lifecycle management success or not. But, at present knowledge sharing only stays at the level of document. Much Critical knowledge is lost in a variety of documents with complex structure and redundant content. How to accurately extract knowledge from the scattered information and describe the knowledge in a more formal and systematic approach is the key to achieve knowledge sharing.As a conceptual model in the semantic level of description and conceptual model, ontology has good concept hierarchy and support for logical reasoning. Ontology-based knowledge representation technology has become a hot issue that the domestic and abroad scholars study on. Ontology-based knowledge management can realized semantic level knowledge services and increase the depth of knowledge utilization. Ontology-based knowledge management can also support the reasoning of implicit knowledge and facilitating the integration of expert knowledge and experience in the field of knowledge structure and so on.It is studied in the paper the status of home appliances in product knowledge expression and the research progressing of ontology in knowledge expressing. It is discussed in the paper about knowledge representation on the current production, reuse and sharing of knowledge. And the deficiencies are also studied.Then, the related theory of ontology and the applications of ontology theory in knowledge representation product features are studied. A conception of generalized functional ontology is put forward and the function ontology condition and the concepts involved in function ontology are described.The functional knowledge in the field of home appliances has also been studied. According to its characteristics, a framework of functional knowledge in the field of home appliances is put forwards in the paper. On the basis of functional knowledge representation framework of Mizoguchi Lab at Osaka University, feeling functional concepts ontology, ways of achievement ontology of feeling functions , ways of achievement ontology of perception functions are added in our framework. And the relationship of functional concept ontology, ways of achievement and functional decomposition tree theory is systematically elaborated.The"feeling"function concept ontology, "compression" ways of achievement,"feeling"function ways of achievement,"perception"function ways of achievement, "cooling" function ways of achievement and functional decomposition tree of refrigerators are established. And the function of refrigerator is decomposed from three levels of"feeling","perception"and"cooling". Functional decomposition trees of refrigerator are drawn.A functional model of home appliances is presents in the paper. And on the basic of this, a Knowledge-sharing strategy based on function ontology is put forward. A software platform for functions knowledge sharing has been developed. The software platform has the following feature:(1) By sharing software platform, designers can express their product knowledge in the form of functional decomposition tree (including feeling functional decomposition tree and device functional decomposition tree).(2) It makes the functional knowledge explicit and formal.(3) Designers can inquire the related function knowledge in the sharing software platform.(4) By sharing other designer's product functional knowledge, the designers can get good understanding of the original design principle.