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We have constructed an original brake disc design system by standardizing, automating, and speeding up each design process. This system consists of two steps. In the first step, a designer, without professional knowledge or skills regarding CAE, can easily carry out FEA by manipulating pull-down menus, parametric design, and automated modeling and meshing. Further, our new computer program automatically identifies each eigenmode. It takes less than two hours for a complete FEA of a new design. In the second step, the developed postprocessor makes it easier and faster to compare the simulated results of many design alternatives and determine the optimum solution. Through the accumulation of vast numbers of FEA cases and tests for validation, we have obtained the knowledge of the effects of disc configurations, dimensions, and material properties on resonant frequencies and thermal deflections.