Study on Expert CAD System for Rotary Shaft

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This research deals with the expert CAD system to be used for the planning design of important machine elements for a tractor-mounted rotary tiller which is becoming a main tillage equipment for paddy rice cultivation in Asia. The all systems had to consist of many conventional engineering know hows with newly analyzed design equations.In case of the rotary blade, twenty-nine design parameters were selected and put into the computer for the designer to design a optimum blade within only one hour, while manual design needs one week. Then, FEM was applied to express the shape not only of three dimensional views but also from any direction, and used for calculating both the weight and the location of the center of the gravity, and also to manufacture the modern shell-mold of the blade as a CAM technology.The expert CAD system was studied to obtain an optimum rotary shaft which is equipped with many rotary blades. The equations to express basic performances of the tiller were analyzed and a new graphical expression to show all the basic performances in one page was proposed. Then, the time of astronomically numerous calculations to estimate all kinds of rotary shafts had to be shortened. The method to obtain the data-base of accumulating a few thousand candidates of only excellent rotary shafts was discussed and realized. In the next stage, a decision-making software for such weight of each performance as the designer wants was composed with the information engineering. Then. the expert CAD system to design the ideal shaft was built into a personal computer.