中文摘要：

四缸U型传动机构是斯特林发动机输出功率的核心部件，其设计的合理与否直接与斯特林发动机系统运行的稳定性、效率、寿命密切相关。基于四缸U型传动机构的特点，建立了传动机构动平衡配重的理论模型，获得了曲轴及输出轴上配重的质量和相位；进而基于多体动力学仿真平台，建立了4缸双作用斯特林发动机传动机构动力学仿真模型，为更真实地模拟曲轴实际运行状态，采用哑元及万向铰连接方法建立了曲轴等效模型，采用虚拟油膜的方法建立了滑动轴承支撑等效模型。动力学仿真结果表明：相比原传动机构模型，改进后的传动机构输出轴、左曲轴和右曲轴速度波动系数分别降低了11．5％、36．8％和34．4％；输出轴质心振动位移均值降低了20．0％；基座承受的动载荷均值降低了23．4％；验证了改进方案可行性和有效性，为斯特林机传动机构的设计提供一定的理论依据。

英文摘要：

The four-cylinder U-shaped transmission mechanism is the core component of the output power of the Stifling engine. The rationality of its design is closely related to its operational stability, efficiency and life of the Stifling engine system. Based on the characteristics of the four cylinder U-shaped drive mechanism, this paper built the theoretical model of the dynamic balance analysis of the transmission mechanism in order to get the quality and the phase of the balance weight on the rotation axis. Then the dynamics simulation model of the four-cylinder double-acting Stifling engine transmission mechanism was established platform. In order to get a more realistic simulation of the lished the crankshaft equivalent model with the dummy bearing supported equivalent model with the virtual film through use of the multi-body dynamics simulation crankshaft＇s actual operation conditions, this thesis established the crankshaft equivalent model with the dummy and universal hinge connection method, and the sliding method. The analysis results indicate that, compared with the original transmission mechanism model, the speed fluctuation coefficients of the output shaft and the crankshaft with the improved model are reduced by 11.5%, 36.8% and 34.4%, respectively; the vibration displacement of the center mass of the output shaft is decreased by 20.0% ; the average dynamic load on the airframe is decreased by 23.4%. The feasibility and effectiveness of the improvement program in this thesis has been verified, and as a result it can provide useful information for the design and operation of the Stifling engine＇s transmission mechanism.