Branch Identification of Planar Six-Bar Mechanisms
| Autor: | Wei-Hung Weng, 翁維宏 |
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| Rok vydání: | 2003 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 91 Branch defect is one of the major problems in the process of the dimensional synthesis of mechanisms. For a synthesized mechanism, if the assembly configurations of all specified positions do not fall on the same branch, the mechanism is said to have branch defect. The main purpose of this work is to propose criteria for the branch identification of mechanism synthesized. The existing methods for the circuit and branch identification of planar four-bar and six-bar mechanisms can be classified into three kinds, i.e., the geometric method, the analytic method and the numerical method. This study presents the advantages and disadvantages of these three kinds of methods in comparison. Based on the geometric feature of centrode, coupler curve, transmission angle and, dead-center configuration, a feasible criterion is proposed for the branch identification of some planar four-bar and six-bar mechanisms. This study also presents a numerical method for the branch identification of mechanisms. The position analysis of the mechanism synthesized starts from each specified position. If the branch exists ends, the two ends of the branch are dead-center positions. The analysis positions of all links on the two dead-center positions of a branch are found out for each specified position on its branch. The ways of approaching to the dead-center position and the values of angular positions of all links on the dead-center position are used for branch identification of mechanisms. Some examples are presented to illustrate the feasibility of the method proposed in this study. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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