Previous Knowledge-Based Engineering (KBE) systems have difficulty in effectively managing the whole design process which often makes the modeling of product fall into chaos. Processoriented knowledge-based CAD system is proposed in this paper to manage product design process. For realizing process-oriented knowledge-based CAD system, mathematical representations of process design are proposed; the algorithms of process planning using graph theory are studied. A detailed discussion about typical design is put forward including process-oriented knowledge based design methods and architecture. The implementation of Processoriented knowledge based design of reducer is studied as a case. Process-oriented knowledge-based CAD system is realized which makes the whole design process efficient and stable.
Although perfectly matching the needs of geometric modeling and CNC machining, feature-based parametric models still can hardly meet the requirements of data extraction and mesh generation process in finite-element preprocessing. In this study, we take the requirements of finite-element preprocessing as well as geometric representation into the consideration of parametric design process and propose analysis-oriented parametric modeling technology. Based on the modeling technology proposed, a system structure of analysis-oriented parametric modeling process is devised. Eventually, an analysisoriented parametric modeling system of a turbine blade is constructed to test and verify the feasibility of the proposed modeling technology and system structure. Experiments show that analysis-oriented parametric modeling technology can make geometric models better adapt to the specific requirements of finite-element preprocessing and has certain reference value to the creation of high-quality digital models.
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