A Collaborative Modeling Method for Contradictory Problems in Extension Design Based on RFBES.

A method of contradictory problems collaboratively modeling for extension design based on the knowledge model of requirement-function-behavior-effect-structure (RFBES) is proposed. The RFBES design process model contains three mappings: RFB-based requirement mapping, FES-based product system level mapping, and behavior-based evaluation mapping. The modeling process of design contradictions is the analysis process of RFBES, that is, requirements analysis determines design goals, system analysis determines design objects, and behavior evaluation determines contradictions. The extension set method is used to classify the actual product behavior, the product design contradiction problem model is established according to the extension classification results. Thus, the hierarchical design contradiction model for structure, effect, function could be established in a collaborative mode, which helps designers solve design contradictions efficiently. The proposed method is applied to construct the design contradiction model in cutting machine innovative design, and the feasibility of the method is verified.