本論文探討雙動式四汽缸史特靈引擎之動力特性，結合熱力模式、運動分析與動力模式，藉以模擬引擎實際運轉過程，作為設計雙動式四汽缸史特靈引擎之輔助參考。本論文所選擇之傳動機構為擺軛式機構，並分析四個汽缸之壓力，透過活塞並經由連桿傳遞至輸出端的過程。由機構之幾何關係，推導各連桿之位置、速度、加速度、角速度與角加速度向量關係，進而得出連桿之運動模式。於熱力模型中，將氣體腔室分為五個子腔室，分別為膨脹室、加熱器、再生器、冷卻器與壓縮室，並考慮其中工作流體之壓力、體積、溫度、質量變化與壓力損失。結合熱力模式得出的結果，於動力模式中計算得出最終之輸出扭矩，並計算引擎指示功、軸功、機械效率與熱效率。根據數值模擬之結果，填充1.768*10^-4 kg之氦氣，無負載之穩態轉速約為1800 rpm。當轉速為804 rpm時會有最大輸出軸功732.3 W，此時引擎總效率為11.7%。

This study is aimed to dynamic simulation of a double acting four-cylinder Stirling engine. By combining thermodynamic model, kinematic model and dynamic model, the engine operation can be efficiently simulated. The transmission mechanism which used in this study is wobble yoke mechanism. The analysis of the force transmission from pressure that acting on four piston surfaces and then to the output shaft is considered. With the kinematic and dynamic analysis of the mechanism, all the links’ vectors of positions, velocities, accelerations, angular velocities and angular accelerations are developed, and finally the dynamic model of mechanism is carried out. In the thermodynamic model, the chamber is divided to five sub-chambers, including expansion space, heater, regenerator, cooler and compression space. Pressure, volume, temperature, mass transfer and pressure loss of the working fluid in these sub-chambers are also considered. Results of pressures from the thermodynamic model are fed into the dynamic model so as to predict the positions of the moving parts. By combining the thermodynamic and dynamic models, the torque output, indicated power, shaft power, mechanical efficiency and heat efficiency are determined eventually. Using helium as the working fluid, the steady rotation speed of the engine is found to be about 1800 rpm. When engine rotation speed is at 804 rpm, a maximum output power of 732.3 watts, and overall efficiency of 11.7% are found.

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