| Summary: | 碩士 === 國立中興大學 === 機械工程學系所 === 96 === The purpose of this study is to improve the performance of a bridge type machining center. The changes are made up the ribs within same substructures. The objective is to increase the stiffness of the structure as well as to minimize the weight. The original design is analyzed first to understand its performance. According to the results, the working table, the bridge, and the base structures are selected to be modified. The topology and sizing optimization techniques are used to optimize the structure. MSC.Nastran is used for finite element analysis.
The design space containing the original ribs is used as the design space for topology optimization. Solid elements are created within this space and these elements will form optimum reinforced structure by using topology optimization. The sizing optimization will change the thicknesses of the original ribs to optimum values.
In comparison with the original design, the static and dynamic performance of some substructures is improved. The structural weight is also reduced. In general, if the topology optimization can be successfully applied in a design space, the solution by topology optimization will be better than that by sizing optimization.
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