Research For Concept Designing Support System About Virtual Prototype

In digital simulation based virtual manufactural environment, product prototype simulating real manufacture process is called Virtual Prototype. Virtual prototype conceptual design corresponds to conceptual designing stage of actual product designing procedure. With Function-Behavior-Structure(FBS) modeling principle of conceptual designing stage, the thesis specified that virtual prototype conceptual designing task, as according to user's requirements information of the new product, to produce its technological schema for production. The schema should describe product function offered, behavior representation and the substancial carrier structure embodying product function and behavior. Hereby, product conceptual designing is actually a system integration process based on requirements analysis.The thesis summarizes studying and development experiences in activities of constructing virtual prototype conceptual design support system based on CBR. First of all, with a detailed discussion of CBR principle, information flow processing and relevant techniques, the framework of conceptual design for complex products virtual prototype based on CBR is proposed. In this framework, basis of the system is case formalization and case base building . The case formalization design is the key element to improving system efficiency and effectivity. Secondly, according to designing task related preconditions and judgements, FBS schema of new product will be figured out through performing corresponding case-based reasoning strategy, consequently the conceptual design task will then be fulfilled.The effect of virtual prototype conceptual design support system includes aiding conceptual designing flow and effectively improving conceptual design capacity. Author has fulfilled innovation work in integrate case representation base on XML with CBR. Firstly, in order to meet universal demand for multi-knowledge complex virtual prototype and to be adaptive with the multi-user cooperative designing pattern, case-based markup language (CBML) is used as a specific markup language tool derived from XML to efficiently represent case in a distributed working environment. Thus, author introduces CBML in applications, and efficiently builds missile case database aimed at solving complex problem of missile product representation. Secondly, based on CBR traditional 4Re flow model, technical innovation choice and optimization on case representation, case reuse, case adaptation and case maintenance were given in the dissertation. The prototype has been put in use and evaluated with a satisfied record .