臺灣博碩士論文加值系統

摘 要
對於大部份的機構而言，當輸入桿的位置確定後，其餘的桿件可能存在一種以上不同的組合構形，這些不同的組合構形分別位於不同的分支或迴路上。若在機構的尺寸合成之後，發現該機構在各指定通過之位置的組合構形並不都處於同一分支上，合成所得的機構在實際的運動中無法達成設計需求，則稱此合成結果產生分支缺陷。
本文之目的在於針對各種平面四連桿與六連桿機構，探討其迴路與分支的特性，並提出一套辨識迴路與分支的方法。平面四連桿機構包括四連桿機構、滑件曲柄機構、倒置滑件曲柄機構，本文利用死點構形之條件及其幾何特徵，進行迴路與分支特性的探討，並提出適用之迴路與分支辨識式。平面六連桿機構包括Watt-I型、II型及Stephenson-I型、II型、III型五種機構。前三型機構的輸入桿位於四連桿組內，本文延伸平面四連桿機構之迴路與分支辨識式，提出適合該三型機構之辨識方法。至於Stephenson-II型與Stephenson-III型機構，本文利用四連桿組耦桿點曲線、運動倒置、死點構形之幾何特徵、速度瞬心、等效連桿組、雙連桿等基本原理，針對此二型機構在以不同之桿件作為輸入桿時，分別進行其迴路與分支特性的探討，並提出適用之迴路與分支辨識方法。

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.

目 錄
頁次
摘要 I
誌謝 II
目錄 III
圖目錄 V
表目錄 VIII
第一章 前言 1
第二章 平面四連桿機構迴路與分支之辨識 6
2-1 非葛氏機構迴路與分支之辨識 6
2-2 葛氏雙搖桿機構迴路與分支之辨識 11
2-2-1 雙搖桿機構迴路與分支之辨識 11
2-2-2 曲柄搖桿機構迴路與分支之辨識 13
2-2-3 雙曲柄機構迴路與分支之辨識 13
2-3 曲柄滑塊機構迴路與分支之辨識 17
2-3-1 曲柄滑塊之耦桿長度大於輸入桿長度 18
2-3-2 曲柄滑塊之耦桿長度小於輸入桿長度 19
2-4 曲柄滑塊倒置機構迴路與分支之辨識 22
2-4-1 曲柄滑塊倒置機構之固定桿長度小於輸出桿長度 23
2-4-2 曲柄滑塊倒置機構之固定桿長度大於輸出桿長度 24
第三章 平面六連桿機構迴路與分支之辨識 28
3-1 Stephenson-III型機構迴路與分支之辨識 28
3-1-1 以位於四連桿組之雙接頭桿為輸入桿 28
3-1-2 以位於五連桿組之雙接頭桿為輸入桿 36
3-2 Stephenson-II型機構迴路與分支之辨識 42
3-2-1 以參接頭桿為輸入桿 42
3-2-2 以雙接頭桿為輸入桿 46
3-3 Stephenson-I型機構迴路與分支之辨識 52
3-4 Watt-I型機構迴路與分支之辨識 60
3-4-1 以雙接頭桿為輸入桿 60
3-4-2 以參接頭桿為輸入桿 64
3-5 Watt-II型機構迴路與分支之辨識 65
3-5-1 以參接頭桿為輸入桿 66
3-5-2 以雙接頭桿為輸入桿 68
第四章 結論 71
參考文獻 73

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