Design optimization of reinforced ribs on the substructures of machine tools
| Autor: | Chun-Ming Chang, 張君銘 |
|---|---|
| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 This thesis aims for improving the static and dynamic stiffness of the bridge structure of a milling machine and the base structure of a lathe by using methods of structural optimization. The approach and results of this research may be applied to other similar types of machine tools. The way to improve the original design is through redesigning the reinforced ribs of the structures while the main structures remain unchanged. The method be used are the Topology optimization and the Sizing optimization. The objective is to minimize the structural compliance and maximize the fundamental natural frequency. A constraint is imposed to limit the weight of ribs to be less than that of the original ribs. For Topology optimization approach, we can obtain the optimum reinforced ribs of outline of the redesign substructure. For Sizing optimization approach, a sequential elimination process is used to determine the optimum distribution of ribs first. A final Sizing optimization is executed to final the optimum thickness of ribs. Two different results can be obtained by designating same or different thickness of ribs. Based on the outcomes, both approaches can improve the structure stiffness. But Topology optimization produces better results. And we fund that the larger the design space, the better the improvement can be observed. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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