Circuit and Branch Identification of Planar Four- and Six-Bar Mechanisms
| Autor: | Ping-Shan Ke, 柯平山 |
|---|---|
| Rok vydání: | 2002 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 90 英文摘要 Circuit and Branch Identification of Planar Four- and Six-Bar Mechanisms Ping-Shan Ke Abstract A mechanism with input link position specified may have more than one assembly configuration, and each of them belongs to different branch or circuit. A mechanism is said to have branch defect if the mechanism synthesized is not able to move through all specified positions in the same branch. The main purposes of this work are to study the characteristics of the circuits and branches of planar four-bar and six-bar mechanisms, and to propose criteria for circuit and branch identification. Based on the geometrical feature of dead-center configuration, this study proposes feasible criteria for branch and circuit identification of planar four-bar mechanisms, including four-bar linkage, slider-crank mechanism, and inverted slider-crank mechanism. There are five types of planar six-bar mechanisms, i.e., Watt-I, Watt-II, Stephenson-I, Stephenson-II, and Stephenson-III mechanisms. For the first three types of mechanisms, because the input link is always located on a four-bar loop, this study presents suitable identification methods for them by extending the circuit and branch identification methods for planar four-bar mechanisms. As for the Stephenson-II and Stephenson-III mechanisms, this study apply the fundamental principles of kinematics, such as coupler curve, kinematic inversion, geometrical feature of dead-center configuration, velocity instant center, equivalent linkage, and dyad, to set up feasible methods for branch and circuit identification for these two mechanisms with various input links. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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