车辆行星传动系统扭转振动固有特性及灵敏度分析

Research on Natural Characteristics and Sensitivity for Torsional Vibration of a Vehicle Multistage Planetary Gears

基于拉格朗日方程建立了包含多级行星传动的车辆动力传动系统纯扭转振动模型,研究了不同工况下系统固有特性的相似性。以某挡位为例,利用实模态理论计算分析了系统各阶固有频率对各部件转动惯量和刚度的灵敏度,得到了系统的固有频率分布规律和物理参数对固有频率的影响,探讨了传动系统中由于连接件扭转刚度变化引起的模态跃迁现象,并初步分析了该现象对固有特性的影响,为车辆多级行星传动系统的动态分析奠定了基础。

On the basis of Lagrangian equation,the pure torsional vibration model of a vehicle powertrain containing multistage planetary gears was established and used to investigate the similarity of natural characteristics when system was in different conditions.By using the real modal theory,the sensitivities of natural frequency to moment of inertia and stiffness were calculated and analyzed when system under a normal condition.The distribution law of natural frequency and the influence of the physical parameter on the natural frequency were obtained.Because of the change of torsional stiffness of joining in multistage planetary gears transmissions,the phenomenon of frequencies loci veering exists.The influence of frequencies loci veering on natural characteristic was discussed simply.It provides theoretical guidance for the dynamic analysis of multistage planetary gears.