本研究利用物件導向方法的概念發展一套應用於平面四桿機構運動設計的程式，用於輔助使用者進行平面四桿機構的運動設計。程式開發的過程中，為使程式具有良好的擴充性，程式架構上使用模組化組合方式建構而成。

　　本論文首先搜集與四桿機構相關的運動分析理論與設計理論，分別將分析理論與各設計理論加以模組化，當程式執行時以分析模組為中心模組，搭配不同的設計模組，即可產生多種的設計功能。本文已開發兩個分析模組與三個設計模組，分別為：四連桿組分析模組、滑件曲柄分析模組、最小傳力角設計模組、對稱耦桿點曲線設計模組及滑件曲柄設計模組，本程式採用圖形使用者界面撰寫程式，可使用滑鼠選取大部份的設計參數，讓機構設計者容易使用本程式，來進行四桿機構的運動設計工作。文末以健身器材的踏步機機構為實例，說明如何以本程式開發新型踏步機機構。

　　This research uses the concepts of object-oriented methodology to develop the software for the kinematic design of planar four-bar mechanisms. In order to have good extensibility, the program architecture is constructed according to the method of modularized combination.

　　Based on some fundamental theories of kinematic analysis and kinematic synthesis of planar four-bar mechanisms, the corresponding analysis modules and design modules are constricted. The analytic modules are saved as the core parts, while the design modules are the peripheries for various design purposes. There are two analysis modules, i.e., analysis module for four-bar linkage and analysis module for slider-crank, and three design modules, i.e., design module of crank-rocker, design module of symmetrical coupler curve and design module of slider-crank. This software is written with Graphics User Interface, and can be operated by mouse to select design parameters. User can use the program to design planar four-bar mechanisms easily. An example, is presented to show how to use this software to design a new stationary exercise apparatus.

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