中文摘要：

为了解决双重功率分流传动系统的动态特性问题,建立该系统的动态力学模型。采用轮齿几何接触分析和承载接触分析方法对齿轮副实际啮合过程进行仿真,得到齿轮副的时变啮合刚度激励,提高了计算的精确度;采用集中质量法,建立了传动系统的弯-扭耦合动力学微分方程;采用自适应变步长四阶龙格-库塔法求解,得到系统的频域和时域响应,分析了各级齿轮副传递的动态载荷的变化特点。结果表明：通过系统动力学模型的建立、求解和分析为其动态设计提供了依据。通过与相关实验进行对比,验证了其正确性。

英文摘要：

In order to implement the dynamics characteristic of dual power-split transmission,a dynamic mechanics model is built. First,according to the methods of the tooth contact analysis（ TCA） and loaded tooth contact analysis（ LTCA）,the actual meshing process of each gear pair is simulated,and the time-varying mesh stiffness excitation are obtained,which can improve the numerical precision. Next,by using the lumped mass method,the bending-torsion coupling three-dimensional dynamical model of the dual power-split transmission is established.Then,by the method of fourth order Runge-Kutta algorithm with variable step lengths,the responses of this system in frequency domain and time domain are obtained,and the dynamic load change characteristics of each gear pairs are analyzed. The results show that the establishment,solution and analysis of the system dynamics model could provide a basis for the dynamic design,and have an important significance for the dynamic efficiency analysis and dynamic performance optimization design of the dual power-split transmission.