Synthesis of Planar Four-Bar Linkages Using Parametric Modeling Software
| Autor: | Hsian-ChunChiuo, 邱顯鈞 |
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| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 SUMMARY This thesis provides an approach for the synthesis of planar four-bar linkages by using the popular parametric modeling software—SolidWorks®. This approach is based on conventional graphical methods as well as analytical methods. The main advantage is that the parametric modeling software allows the user to adjust the model in real time due to its immediate updating feature. This thesis begins with guiding the user to utilize SolidWorks® and reviewing the synthesis of planar four-bar linkages. It then provides step-by-step procedures to explain the concepts of solving four basic problems of synthesis in the software environment. The four classical synthesis problems of planar four-bar linkages discussed in this thesis are: the rigid-body guidance, path generation, function generator, and point-angle problems. For each problem, its maximum number of design specifications has been demonstrated by using SolidWorks® in order to prove the feasibility of the proposed approach. Keywords: Parametric Modeling Software, SolidWorks, Synthesis, Planar Linkage. INTODUCTION This thesis provides an approach for the synthesis of planar four-bar linkages by using the popular parametric modeling software—SolidWorks®. For the synthesis of planar four-bar linkages, traditional graphical methods are usually cumbersome and lacking accuracy. On the other hand, analytical and numerical methods are complicated and require substantial knowledge about the methods. In this thesis, we aim at combining the advantages of graphical and analytical methods. The goal is to provide a simple and intuitive method for the user to synthesize planar linkages even when he/she only has limited knowledge about analytical, numerical, or graphical method for synthesis. We discuss four classical synthesis problems: the rigid-body guidance, path generation, function generator, and point-angle problems. The idea of apply the concept of geometric constraint to planar mechanism analysis was proposed by Kinzel et.al (2006). The concept of applying parametric modeling software to the analysis of planar mechanisms was proposed recently by the Mirth (2012). He combined the parametric modeling software, SolidWorks®, with the concept of geometric constraints and used it in teaching plane mechanisms. To date, there is no thorough study in the synthesis of planar mechanisms by using parametric modeling software. This thesis focuses on the use of the parametric modeling software SolidWorks® in planar mechanism synthesis. MATERIALS AND METHODS This approach employs the geometric constraint feature in the 2-D sketch mode of SolidWorks®. First, the mechanism is drawn at each required position (or precision point) and equality constraints are applied to corresponding links at each position. The parametric modeling software allows the user to adjust the model in real time due to its immediate updating feature. Furthermore, the kernel of the program has the advantages of both graphical and numerical methods with powerful calculation ability and precise cartography function. Finally, the design results can be verified directly by animation models in SolidWorks®. This thesis begins with guiding the user to utilize SolidWorks® and reviewing the synthesis of planar four-bar linkages. It then provides step-by-step procedures to explain the concepts of solving four classical synthesis problems in the software environment. We hope to allow users who may not have substantial background knowledge of planar mechanisms to synthesize planar four-bar linkages by using this tool. RESULTS AND DISCUSSION For each synthesis problem, the maximum allowable design specifications of has been demonstrated by using SolidWorks®. There are at most five design positions in a rigid-body guidance problem; at most nine coupler points can be specified in a path generation problem. Up to five precision points can be the synthesized in a function generator problem. For the point-angle problem, there can be at most five design positions. When the maximum design specifications are given, SolidWorks® can achieve satisfactory results in all four problems. Most importantly, the feasibility of design results can be verified immediately by animation models within the same software environment. The parametric modeling software provides a powerful means for synthesizing planar linkages. The strength of this approach for the synthesis of planar mechanism design lies in the ability to make changes with immediate visual feedback. This capability is well harnessed in the synthesis of planar four-bar linkages by the development of a systematic set of design steps that allow the designer to verify the linkage motion as the linkage is being created. The use of parametric modeling software with SolidWorks® can allow the designer to quickly move toward viable linkage solutions. CONCLUSION This thesis demonstrates that the parametric modeling software can be an intuitive and user-friendly software environment for the synthesis of planar four-bar linkages. The parametric modeling software can also be utilized in the analysis of more complicated planar linkages. Even though matching maximum design positions of planar four-bar linkages are hard to accomplish using conventional methods or even this approach. When using this approach in real applications, we can reduce the number of design positions to make the synthesis processes more feasible. That is, we can adjust the design results according to more flexible requirements. Based on the study given in this thesis, if integrated, one can establish more complete and comprehensible planar linkage design and analysis tools in a parametric modeling software environment. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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