为获得船用两级串联人字齿行星齿轮传动系统的振动特性，对其进行动力学第一类问题研究。基于相位调谐理论分析系统动态啮合力，定性总结了在一般情况下不同啮频谐波下的6种激励模式及其与系统参数的关系。基于Romax软件建立系统动力学仿真模型，以1 MW两级串联行星齿轮箱为例，获得了系统固有特性和稳态动力学响应。研究表明：该系统的固有特性包含5种具有规律性的振动模式，即单级横移-摆动模式、耦合横移-摆动模式、单级扭转模式、耦合扭转模式和单级行星轮模式；与单级行星轮系不同，两级串联行星轮系的稳态动力学响应与激励和模态振型不存在一一对应的情况。

In order to obtain the vibration characteristics of the marine twostage tandem herringbone tooth planetary gear train，the first kind of dynamics was studied for it. The dynamic meshing forces of system was analyzed based on the phase tuning theory，and six excitation modes under different harmonic frequencies and their relations with system parameters were qualitatively summarized in common cases. The dynamic simulation model was established based on Romax software，taking a 1 MW twostage tandem planetary gearbox as example，the inherent characteristics and steadystate dynamic response of system were obtained. The research result shows that the system inherent characteristics contain five regular vibration modes，namely single stage transverseswing，coupled transverse swing，single stage torsion，coupled torsion and single stage planet gear modes. Different from the singlestage planetary gear train，the steadystate dynamic response of twostage tandem planetary gear train does not have exactly correspondence with excitation and mode shape.

U664.22，TH132.4