Acco rding to ming le of alternat ing logic argumentat ion w ith numerical value calculat ion in the process of mechanical pro duct design, the basic theory and key techniques of exper t sy stem o f desig ning cylindr ic g ear t ransmission are ex po unded in this paper. T he rule fo rms of know ledg e representat io n to use eng ineering design, hier archy str ucture model of knowledge base and solv ing tact ics of fo rw ard r easoning is included. The result s of preliminary test s show that the system is reasonable in co nstr uction cor rect in inference and acceptable in use.
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