功率六分支同轴人字齿轮传动是某船舶动力传输系统的重要组成部分，为了对船舶动力系统的振动噪声和动态载荷进行评估，需要开展功率六分支同轴人字齿轮传动系统的动态特性与均载特性研究。本文采用集中参数法建立了含时变啮合刚度和传动误差的扭转振动模型，并采用解析法求解动力学方程；依据齿轮副沿啮合线的相对振动响应，给出了动载系数与均载系数计算公式；分析了输入轴、双联齿轮轴及输出轴的扭转刚度对传动系统动载特性和均载特性的影响。结果表明：输入轴扭转刚度对系统均载特性影响较大；双联齿轮轴扭转刚度对分扭级和并车级的均载特性均有影响，且随着双联轴扭转刚度增加，动载系数均变大；输出轴扭转刚度对传动系统各分支动载系数几乎没有影响。

Power six branch coaxial herringbone gear transmission is an important part of a ship power transmission system.In order to evaluate the vibration noise and dynamic load of the ship power system,it is necessary to study the dynamic characteristics and load sharing characteristics of power six branch coaxial herringbone gear transmission system.In this paper,a torsional vibration model with timevarying meshing stiffness and transmission error is established by means of lumped parameter method,and the dynamic equation is solved by analytical method; according to the relative vibration response of the gear pair along the meshing line,the calculation formulas of dynamic load coefficient and load sharing coefficient are given.The influence of torsional stiffness of input shaft,double gear shafts and output shaft on dynamic load characteristics and load sharing characteristics of transmission system was analyzed.The results show that the torsional stiffness of the input shaft has a great influence on the load sharing characteristics of the system; the torsional stiffness of the double gear shafts has an influence on the load sharing characteristics of the split torque stage and the parallel stage; with the increase of the torsional stiffness of the double shafts,the dynamic load coefficients become larger; the torsional stiffness of the output shaft has little influence on the dynamic load coefficients of each branch of the transmission system.

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