转定子静态不对中条件下碰摩故障仿真  

Rub-impact fault simulation of a rotor system under static misalignment conditions

作　　者：马辉[1] 太兴宇[1] 牛和强[1] 闻邦椿[1] 

机构地区：[1]东北大学机械工程与自动化学院,辽宁沈阳110819

出　　处：《振动工程学报》2013年第2期260-268,共9页Journal of Vibration Engineering

基　　金：教育部新世纪人才支持计划资助项目(NCET-11-0078);中央高校基本科研业务费专项资金资助项目(N100403008)

摘　　要：以一个单跨双盘柔性转子系统为研究对象,首先建立转子系统有限元模型,将定子简化为一个沿圆周方向均布的点集,转子考虑为一个点,通过建立多个点-点接触单元来模拟转定子碰摩故障,通过检测点-点接触单元之间的间隙来确定转子的分离及接触,进而通过碰摩力耦合转定子模型,采用增广的拉格朗日方法来处理接触约束条件,用库仑摩擦模型来模拟转定子之间摩擦。考虑在转定子不对中情况下,转速、转定子当量碰撞刚度、当量碰撞阻尼和摩擦系数对碰摩力的影响。研究结果表明在不同转速下,可能存在不同的碰摩形式(局部碰摩和整周碰摩)及瞬时冲击力;当量碰撞刚度对法向碰摩力影响最大,不对中量主要影响瞬时冲击力,对稳态碰摩力影响不大,当量碰撞阻尼和摩擦系数对法向碰摩力有一定影响。In this paper, taking a flexible rotor system with single span and two discs as the research object, the finite element model of the rotor-bearing system is established. The stator is simplified as a group of equispaced points along the circumfer- ence and the rotor as a point based on contact dynamics theory. The rotor-stator rub-impact is simulated using multiple point- point contact elements. The separation and contact of rotor and stator are determined by the change of cylindrical gap, and the rotor and stator model are coupled by nonlinear rub-contact force. By adopting the augmented Lagrangian method to deal with constraint conditions of the contact, and coulomb friction model to simulate rotor-stator frictional characteristics, the responses of the rotor system with rubbing are analyzed. The effects of rotation speed, equivalent collision stiffness and damping, and friction coefficient on rub-impact forces are discussed under static rotor-stator misalignment conditions. The results show that there may be different types of rub-impact （local and full） and transient impact forces under different rotation speeds. Equiva- lent collision stiffness has the greatest effects on the normal rub-impact force, the amount of misalignment affects mainly the transient impact force and does not affect the steady rub-impact force, equivalent collision damping and friction coefficient have some influence on normal rub-impact force.

关 键 词：碰摩 柔性转子系统 有限元 接触动力学 不对中 

分 类 号：TH113[机械工程—机械设计及理论] O347.6[理学—固体力学]