基于拟动力学方法的反转圆柱滚子轴承动力学特性研究

Research on Dynamic Behaviors of Counter-Rotating Cylindrical Roller Bearing Based on Quasi-Dynamic Method

关键词:  航空发动机  中介支撑  反转圆柱滚子轴承  拟动力学分析

Key words:  Aircraft engine  Intershaft support  Counter-rotating cylindrical roller bearing  Quasi-dynamic analysis

摘要:

反转圆柱滚子轴承的性能直接影响着航空发动机工作的稳定性与可靠性。为了研究反转圆柱滚子轴承动力学特性，基于弹性流体动力润滑和流体动压润滑等理论，采用拟动力学分析方法，建立了反转圆柱滚子轴承动力学计算模型。利用该计算模型对滚子打滑率进行了验证计算，随着径向载荷的增加，计算值由7%减小至2%，与实验值吻合较好。同时，对反转圆柱滚子轴承动力学进行计算分析，研究了动态运转中轴承的载荷和速度分布，以及不同工作状态对轴承打滑率的影响。研究表明，倒装时反转圆柱滚子轴承承载区滚子受载比顺装更均匀，但非承载区滚子及保持架打滑率比顺装更严重。

Abstract:

The characteristics of the counter-rotating cylindrical roller bearing directly affect the stability and reliability of the aero-engine. In order to study dynamic behaviors of counter-rotating cylindrical roller bearing，based on elasto-hydrodynamic lubrication theory，hydrodynamic lubrication theory as well as the quasi-dynamic analysis method，a new quasi-dynamic model of the counter-rotating cylindrical roller bearing is established. And then，this model is utilized to verify rollers sliding ratio. As the radial load increases，the calculated values decrease from 7% to 2%，which agree well with the experimental data. Moreover，the model is used to calculate and analyze the dynamic behaviors of counter-rotating cylindrical roller bearing. The distribution of dynamic load and rotating speed of the counter-rotating bearing is studied in operation and the rotating sliding ratio of the counter-rotating bearing is discussed in different conditions. Results show that the load distribution in the loaded zone is more even in the inverted configuration than it in the natural configuration，while the slipping of the rollers in the unloaded zone and the cage is more serious in the inverted configuration.