Research On Hybrid Reasoning And Mapping Technology For Function Solving In Product Conceptual Design

Function solving is an important link of conceptual design. Aiming at thedeficiencies of reasoning technology in product conceptual design, a hybridreasoning mapping method for product conceptual design function solving wasproposed. Relevant theories, key technologies and applications on function solvingmapping were systematically studied. The main research contents can besummarized as follows:Firstly, a framework model of “Requirements-Function-Behavior-Structure”(R-F-B-S) for conceptual design was proposed based on the extension of intentionof conceptual design and multiple requirements of flexibility and adaptability. Theprocess of conceptual design could be divided into requirement transformation andfunction solving, variety level of product innovation was integrated into functionsolving during the process. Specific description and expression for the factorsinvolved in resolution process were established and design function requirementcould be expressed clearly and correctly by implementing function thesaurustables according to the characteristics of the function.Secondly, the knowledge base modeling techniques of supporting functionsolving hybrid reasoning mapping were studied. The R-F-B-S knowledgeexpression model was proposed based on established conceptual design processmodel. Knowledge base could be reduced to enterprise existing product knowledgemodule and domain/multi-domain knowledge module. The structure of eachcomponent of this model has been described in detail. Based on knowledgemodule and knowledge expression model, the construction of design knowledgebase was analyzed.Subsequently, function solving hybrid reasoning mapping for conceptual designwas suggested. The entropy grey relation case reasoning mode, evolutionaryreasoning mode for function decomposing and behavior solving as well as theassociation rules reasoning mode for mining algorithm were proposed. Intelligent conceptual design solving process framework was established while flexiblemapping strategies were applied to adapt different degrees of product innovationrequirements. The searching process and applicable state of each reasoning modewere studied and the feasibility of mapping strategy was testified by examples.The method of mapping by design team is also explained. And a method aboutoptimizing the result of mapping by computer and human is discussed. To evaluateprinciple scheme, a design evaluation and decision making method based on fuzzysynthesis theory is studied.Finally, according to the achievements above, a function solving reasoningsystem for conceptual design is developed with visual studio2005C#on thewindows platform. The working interface of this application software wasdisplayed combined with examples.