双转子系统轴承座松动的动力学模型及故障特性

徐洪志; 王南飞; 蒋东翔

doi:10.13224/j.cnki.jasp.2016.11.029

双转子系统轴承座松动的动力学模型及故障特性

doi: 10.13224/j.cnki.jasp.2016.11.029

清华大学机械工程学院热能工程系电力系统和发电设备控制及仿真国家重点实验室, 北京 100084

基金项目:

国家自然科学基金（11572167）

详细信息

作者简介:
徐洪志(1974-),男,河北枣强人,博士生,主要从事航空发动机转子动力学特性及故障诊断研究.

中图分类号: V231.9;TH113.1
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出版历程
- 收稿日期: 2015-02-07
- 刊出日期: 2016-11-28

Bearing pedestal looseness dynamic model of dual rotor system and fault feature

State Key Laboratory of Control and Simulation of Power System and Generation Equipment, Department of Thermal Engineering, School of Mechanical Engineering, Tsinghua University, Beijing 100084, China

摘要

摘要: 针对双转子系统轴承座松动故障，基于实验台双转子结构，考虑松动轴承座的3自由度平面刚体运动，引入碰撞恢复系数，建立双转子系统轴承座松动的动力学模型.基于Timoshenko梁单元，利用有限元和刚体运动学方法，采用Newmark-β算法进行数值仿真，对轴承座松动故障时内、外转子运动的动力学特性进行了研究.同时，进行了两种不同转速组合下双转子系统的松动实验，结果基本相同.将仿真结果与实验结果对比分析，结果表明：轴承座松动故障时，松动转子振动位移波形有“削波”现象.内、外转子振动位移频谱不但含有两转子基频的差频与和频，还包含支承松动转子的2倍频，3倍频等分量；低频段谱线较多，含有分频成分等；转子位移频谱中还含有较少的组合频率成分等.轴承座单侧松动时，松动转子的轴心轨迹呈拉伸的类椭圆状.
- 轴承座松动 /
- 双转子 /
- 刚体运动 /
- 轴心轨迹 /
- 有限元 /
- 动力学模型 /
- 振动频谱
Abstract: For the bearing pedestal looseness fault of dual rotors system, after taking into account three DOF(degree of freedom) planar rigid motion of loose bearing pedestal and introducing collision recovery coefficient, a dual rotor system dynamics model including loose bearing pedestal was set up based on the dual rotor structure of experiment rig. Using the finite element method and rigid body kinematics, and adopting the Newmark-β algorithm for numerical simulation based on Timoshenko beam elements, the dynamic characteristics of the inner and outer rotors and the bearing pedestal plane rigid body motion in occurrence of bearing pedestal looseness fault were studied. Meanwhile, the loose experiments of dual rotor system under two different speeds' combination were carried out, and the experimental results were basically the same. The simulation results with the bearing pedestal looseness fault of dual rotors bench were compared, indicating loose rotor vibration displacement waveforms had "clipping" phenomenon. When the bearing pedestal looseness fault occurred, the inner and outer rotors' vibration spectrum not only contained the difference and the sum frequency between the two rotors' fundamental frequency, but also contained loose support rotor second and third harmonics components, etc; there were more low frequency spectrums containing dividing component, etc; the rotor displacement spectrum also contained fewer combination frequency components, etc; when unilateral bearing pedestal was loosened, the inner rotor axis trajectory was drawn into similar-ellipse shape.
- bearing pedestal looseness /
- dual rotor /
- rigid motion /
- axis trajectory /
- finite element /
- dynamic model /
- vibration spectrum

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