磁悬浮轴承系统联轴器不对中动态特性研究  

Dynamic Characteristics of Magnetic Bearing System with Coupling Misalignment

作　　者：姚润晖 周瑾[1] 关旭东 吴海同 徐园平[1] YAO Runhui;ZHOU Jin;GUAN Xudong;WU Haitong;XU Yuanping(College of Mechanical&Electrical Engineering,Nanjing University of Aeronautics and Astronautics Nanjing,210016,China)

机构地区：[1]南京航空航天大学机电学院,南京210016

出　　处：《振动．测试与诊断》2022年第1期124-128,199,共6页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(52075239);南京航空航天大学基本科研业务费专项科研资助项目(NZ2018460);江苏高校“青蓝工程”资助项目。

摘　　要：为了使含有多跨转子的大型磁悬浮旋转机械系统能够稳定运行,开展联轴器不对中对转子动态特性的影响规律研究。通过将联轴器不对中量等效为施加在转子上的旋转力,建立具有联轴器不对中的磁悬浮转子系统数学模型。基于该模型仿真分析了转子的轴心轨迹和振动频谱,给出转子位移信号中转速二倍频分量幅值与转速、联轴器不对中量之间的关系,并进行磁悬浮轴承⁃转子系统联轴器不对中实验。实验结果表明:在一定转速下,随着联轴器不对中量增大,转子位移转速二倍频信号幅值近似呈线性增加,约为每增加0.1 mm不对中量,二倍频位移信号幅值增大1.53μm。Large-scale magnetic levitation rotating machinery with multi-span rotors often require couplings to connect the rotors.Misalignment of the coupling will affect the stability of the rotor motion and even cause seri⁃ous accidents.To make sure of the system stability,it is necessary to carry out research on the influence of cou⁃pling misalignment on the dynamic characteristics of the rotor.By equating the coupling misalignment to the rota⁃tional force exerted on the rotor,a mathematical model of the magnetic suspension rotor system with coupling misalignment is established.The axis track and vibration frequency spectrum of the rotor are simulated and ana⁃lyzed based on this model,the relationship between the second-harmonic signal of rotor displacement and the ro⁃tation speed and the coupling misalignment is given.The experimental results show that at a certain speed,the amplitude of the second-harmonic displacement signal increases linearly by 1.53μm for every 0.1 mm of cou⁃pling misalignment.

关 键 词：磁悬浮轴承 联轴器不对中 频谱分析 轴心轨迹 

分 类 号：TH133.3[机械工程—机械制造及自动化]