高速滚动轴承-双转子主轴系统离散建模动力学数值仿真分析  

HIGH-SPEEP ROLLING BEARING-DUAL ROTOR SPINDLE SYSTEM NUMERICAL SIMULATION ANALYSIS OF DISCRETE MODELING DYNAMICS

作　　者：李云龙 唐志宇 LI YunLong;TANG ZhiYu(School of Energy and Building Environment,Guilin University of Aerospace Technology,Guilin 541004,China)

机构地区：[1]桂林航天工业学院能源与建筑环境学院,桂林541004

出　　处：《机械强度》2021年第4期798-807,共10页Journal of Mechanical Strength

基　　金：广西高校中青年教师科研基础能力提升项目(2020KY21011)资助。

摘　　要：在轴承动力学和转子动力学基础上,对航空发动机双转子-轴承系统的动力学特性进行研究。根据Timoshenko梁-轴理论,建立了双转子系统有限元离散化模型,并用数值方法对其求解,研究表明:(1)由于系统非线性特性的影响,系统在多频耦合激励下响应出现激励频率的倍频率及组合频率,系统振动响应异常复杂;(2)中介滚子轴承的径向游隙变化对系统响应有一定的影响,对支撑轴承处的响应影响较小,较小的游隙可使中介轴承和转子系统中心处的响应位移降低,从而使系统趋于稳定;(3)适当增加支撑轴承滚动体个数使支承轴承和转子中心处的响应降低,系统稳定性也增加;(4)采用实验验证分析可知:仿真计算值与实验值变化趋势基本一致,存在一定的误差(误差约有15.6%)。分析结果为定量和定性分析该双转子的稳定性提供了参考依据。Based on the bearing dynamics and rotor dynamics models,the dynamic characteristics of aero-engine rolling bearing-dual rotor spindle system are studied.According to Timoshenko beam-axis theory,the finite element discretization model of rolling bearing-dual rotor spindle system is established and the numerical method is used to solve the problem.The results shows that:(1)Due to the influence of nonlinear characteristics of the system,the system responds to multiples and combined frequencies of the excitation frequency under multi-frequency coupling excitation,the system vibration response is extremely complex.(2)The change of the radial clearance of the intermediate roller bearing has a certain influence on the system response,the effect on the response of the supporting bearing is small,and the small clearance can reduce the response displacement of the center of the intermediate bearing and the rotor system,so that the system tends to be stable.(3)Properly increasing the number of supporting bearing rolling elements reduces the response of the supporting bearing and rotor center,and the system stability also increases.(4)The general trend of the simulation curve is the same as the experimental data but not fully in agreement,and the result has some errors(the error is about 15.6%).The analytic results will provide a referenced gist for the dynamic stability of dual-rotor-rolling-bearing by the quantitative and qualitative analysis.

关 键 词：滚动轴承-双转子系统 动力学 有限元法 

分 类 号：V232[航空宇航科学与技术—航空宇航推进理论与工程]