| URN | etd-0729113-110631 | Statistics | This thesis had been viewed 459 times. Download 9 times. |
| Author | Yan-Hua Wu | ||
| Author's Email Address | trewuelk@yahoo.com.tw | ||
| Department | Institute Of Mechanical Engineering | ||
| Year | 2012 | Semester | 2 |
| Degree | Master | Type of Document | Master's Thesis |
| Language | zh-TW.Big5 Chinese | Page Count | 93 |
| Title | Static and Dynamic Analyses and Improved Design of Machine Tool Structures | ||
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| Abstract | This thesis investigates the structural vibration problems of machine tools, and proposes improved designs of the machines in order to reduce the possibilities of resonance and increase precision and stabilities during cutting operation. The CAD model of a machine tool was first imported to the finite element software ANSYS Workbench to perform convergence analysis, after which a model with a proper number of nodes was selected. Then, static analysis, dynamic analysis and harmonic response analysis were performed on the finite element model with appropriate loadings and boundary conditions, acquiring deformations, equivalent stresses, natural frequencies, mode shapes, and harmonic response functions of the structure. The Hookeˇ¦s law was also employed to calculate their dynamic stiffnesses. Based on the analyzed results, structural weakness was identified. By raising the fundamental natural frequency and reducing the structural mass, the dynamic characteristics of the machine tool can be enhanced. The design results show that the improved models produce higher natural frequencies and lower masses, which can effectively decrease the possibilities of structural resonance on the machine tool. |
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| Files | indicate in-campus access at one year and off-campus not accessible | ||
| Date of Defense | 2013-07-26 | Date of Submission | 2013-07-29 |