非稳态工况下弹支SFD圆柱滚子轴承动态特性分析

Dynamic Characteristic Analysis of Elastic Support and Squeeze Film Damper Cylindrical Roller Bearing under Unsteady Condition

航空发动机主轴系统中滚动轴承常与弹性支承和挤压油膜阻尼器(Squeeze film damper,SFD)联合使用,以降低转子的振动。由于支承方式的改变,轴承的运动状态发生较大的变化。基于滚动轴承动力学理论和模态综合法,建立了弹支SFD圆柱滚子轴承-刚性转子刚柔耦合动力学分析模型,开展了转子不平衡量产生的非稳态载荷对弹支SFD圆柱滚子轴承动态特性的影响研究。结果表明,非稳态工况下,弹支SFD圆柱滚子轴承保持架打滑率表现出明显的波动;挤压油膜阻尼器结构参数对轴承承载和打滑特性有不同程度的影响;周期性的时变载荷使保持架打滑增大且打滑率呈现无规则波动。

The bearing in the main shaft system of the aero-engine is often used in combination with elas-tic support and squeeze film damper(SFD)to reduce vibration.And this will affect the motion state of the bear-ing due to the change of the supporting mode.Based on the dynamics theory of rolling bearing and the modal syn-thesis method,a bearing/rigid rotor model supported by the cylindrical roller bearing with elastic support andsqueeze film damper is established.It is used to study the influence of unsteady load caused by rotor unbalanceon dynamics characteristics of the bearing.The results show that the skidding rate of the cage shows obviousfluctuation characteristics when the unbalance causes the bearing under unsteady conditions.The squeeze oildamper has a certain influence on the bearing loads and skidding characteristics.The skidding rate of cage in-creases and presents irregular fluctuations due to the periodic time-varying load.