- 學位論文
傾向性分析於一種變化鏈機構之尺寸設計研究
Study on Applying Propensity Analysis to the Dimensional Synthesis of a Variable-Chain Mechanism
摘要
本文提出傾向性分析於一種變化鏈機構之尺寸合成方法，它只需要先設計出平面連桿組的大概位置，即可利用本文提出的方法，計算出所有桿件的尺寸，因此能夠減少以往使用試誤法所花費的時間。 本研究應用三度空間運動平台的輸入對輸出的傾向性分析理論，探討兩個自由度貨車尾門升降機構的尺寸合成方法，首先以五連桿組證明傾向性分析理論的適用性，接著以貨車尾門升降機構為例，透過傾向性分析理論的應用，系統化地合成出尾門升降機構的桿件尺寸。依此結果，提出此種變化鏈機構之系統化尺寸合成方法的步驟流程。本研究並選定不同的四組輸入桿初始長度與角位置，進而使用SolidWorks軟體繪製出對應的3D模型，進行動態模擬，最後進行機械利益分析，篩選出尺寸較佳的設計。因此，本研究提出的此種變化鏈機構之系統化尺寸設計方法，已初步證實其可行性與正確性。
並列摘要
This study presents a dimensional synthesis methodology of applying propensity theory to a variable-chain mechanism. This method only requires the designer roughly set the initial positions of related links and the positions of fixed joints, and then could obtain all the dimensions of links by following the steps. It can, therefore, save a significant time of design. This study applies the input-output propensity theory for three-dimensional kinematic platform to develop the method of dimensional synthesis for a 2-DOF tailgate lift mechanism used in truck. Firstly, the applicability of input-output propensity theory is confirmed by applying to a 2-DOF five-bar linkage. Then, a tailgate lift mechanism is taken as another example to apply the propensity theory to analytically synthesize the required dimensions of links. According the way of yielding the results, a systematic method of dimensional synthesis for this variable-chain mechanism is presented. This study then takes 4 different sets of length and initial position of the input link for the lift mechanism, and yields different corresponding synthesized dimensions of other links. Then the corresponding 3D models to the results are set up via Solidworks software and the dynamic simulations of those models are also performed in Solidworks. A better design is selected among those potential synthesized mechanisms by setting the criteria of mechanical advantage. Through the mentioned tests, the preliminary feasibility and validity has been confirmed for this systematic method of dimensional synthesis of a special variable-chain mechanism.