Study on Applying Propensity Analysis to the Dimensional Synthesis of a Variable-Chain Mechanism

• Main Authors: Hsuan-Yi Yu, 游軒毅
• Other Authors: 陳正光
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/htpyct

碩士 === 國立臺北科技大學 === 機電整合研究所 === 101 === 　　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.