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Flexible modular design provides an approach to rapid response design of large mechanical products, such as hydraulic press machine. This implies a new knowledge model to support the design process. This paper introduced the concept of flexible module, and proposed an object-oriented approach to modeling design knowledge, in which modules were represented as objects. The object architecture consists of three tiers: function module, flexible module and instance module. A frame-based object description language (FBODL) was proposed to represent multiple domain knowledge, in which the design knowledge module was termed as Knowledge Unit. The case based reasoning and frame based reasoning process were described. Finally, an example of knowledge base for modular hydraulic press machine design was given to illustrate the methodology.
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