Research on Digital Description to Design Process

The digital description to design process is one of key technologies for design automation.According to the philosophy of digital process control in the numerical control machining, the digital description Model (DDPDM) for design process is presented in this paper. The principle of DDPDM is that design instruction prescribes the basic property for design action.and the attributes in the design instruction are basic elements in the design action which are design functions, product data, design organization, design resource and relation in the design action. The basic design functions have been described in BSF Normalization Form(BNF) which contains detuction, calculation, query, evaluation and post-process simulation.