摘 要 针对某新型少齿差行星减速器，进行了不同啮合位置时的多体接触有限元分析，求得轮齿时变啮合刚度，采用动力接触有限元法计算齿轮啮合冲击激励，得出包括时变刚度激励、误差激励、啮合冲击激励的齿轮啮合内部动态激励。建立减速器的有限元动力分析模型，在综合考虑内部激励和外部激励的情况下计算了减速器的时域和频域响应及加速度级1/3倍频程结构噪声。利用振动测试分析仪对新型少齿差内啮合减速器进行测试分析，并与有限元计算结果进行对比，二者较为吻合。

Abstract: By the finite element method of multi-body contact problem, the time-variable stiffness at different rotational position of a new type gear reducer with small tooth number difference was obtained, and the dynamic contact finite element method was used to analyze the meshing impact, and then the internal excitation which composed of the excitations of time-variable stiffness, gear error and meshing impact were calculated. A dynamic finite element model of reducer was established and used to analyze the dynamic response of time-domain and frequency-domain as well as one-third octave acceleration grade structural borne noise of gear reducer under dynamic excitation. At last an experiment of vibration analysis of reducer was conducted using the analysis instrument of vibration test. The computational results obtained are in a good agreement with the data of experimental tests.