柔性铰链可倾瓦轴承不平衡响应的主动控制

摘要

Active control is used in rotor-bearing system in order to improve rotating accurcy.Based on the flexure-pivot tilting pad journal bearings, the computational model of axis center orbit and vibration rules of pads are built.Considering inertia of system as well as nonlinear film force, the axis center orbit and the vibration rules of pads are obtained when the rotor is affected by unbalanced response.And a new method about active control is put forword.The result shows that the rotor affected by unbalance load will vibrate periodically.Through exerting force on the back of a pad, the vibration rules of pads will be controlled and unbalanced load of the rotor will be offset.Then, vibration of the rotor decreases significently through active control, which greatly improves the rotating accurcy of rotor.%在轴承转子系统中,为提高转子的旋转精度,对系统进行了主动控制.基于柔性铰链可倾瓦轴承建立了轴承转子系统轴心轨迹和轴瓦摆动的计算模型,在考虑系统惯性和非线性油膜力的基础上,计算了转子在不平衡响应下的非线性轴心轨迹和轴瓦的摆动规律,并提出了一种振动的主动控制方法.仿真计算结果表明,转子的不平衡载荷是转子产生周期性振动的重要因素.通过在轴瓦的瓦背施加力,控制轴瓦的摆动规律,可以抵消转子不平衡载荷引起的振动.通过主动控制,转子振动明显减弱,极大得提高了转子的旋转精度.