Research And Development Of Platform For Developing Intellectual CAD System Based On Parametric Design

As the application of CAD software is deepened, the deficiency of the traditional CAD system has been exposed gradually. First, a large amount of work is done repeatedly in the design process of the similar product; on the other hand, the support to design is insufficient in the design process of products. In order to solve the above problems, this thesis researches and develops an intellectual CAD technology and system based on parametric design which is used for developing intellectual CAD system for the design of a specific product. This intellectual CAD system not only has ability of intelligent design but also has ability to produce the figure automatically. The former can provide support for designing products; and the latter can free the designer from the tedious repeat drafting operations. The function of intelligent design can be realized through using the knowledge base system which is structured on "knowledge base + reasoning machine" and carry on reasoning via knowledge reasoning technology for intelligent design. The knowledge base is comprised of abstract products design knowledge, and the reasoning machine is a mechanism carrying on reasoning in terms of the knowledge in the knowledge base. Function of producing the figure automatically is realized by the special system which can produce all figures with two kinds of methods to produce figure, one of which is that figures are produced by revising templates, and the other is that figures are drawn through the procedure. In order to shorten the development cycle of intellectual CAD system, a developing platform has been set up. Based on the platform, an intellectual CAD system for specific product design can be developed rapidly. The development process can be devided into two steps. Firstly, summarizes the design knowledge of the products according to the user's requirements and adds them to the knowledge base. Then finishes development of the drawing generation system which can meet user's demand pefectly.With the method, an intellectual CAD system used to design the petroleum pipeline air conditioner system for Air conditioner Limited Company of Harbin(HKTCAD) has been developed.