高温磁悬浮轴承-转子系统建模与动力学分析  

Modeling and Dynamics Analysis of High-Temperature Magnetic Bearing-Rotor System

作　　者：金超武[1] 辛宇 周扬 赵瑞瑾 周瑾[1] 徐园平[1] JIN Chaowu;XIN Yu;ZHOU Yang;ZHAO Ruijin;ZHOU Jin;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,江苏南京210016

出　　处：《西南交通大学学报》2024年第4期746-754,822,共10页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金(52275059);航空发动机及燃气轮机基础科学中心重点项目(P2022-B-Ⅲ-004-001)。

摘　　要：在多电航空发动机中,主动磁悬浮轴承因其耐高温、非接触等特性可以突破温度对支承部位的限制,使支承部位能够更靠近燃烧室.为探究温度对磁悬浮轴承转子系统动态特性的影响规律,提出一种高温磁悬浮轴承转子系统动力学建模方法.通过仿真得到转子在不同温度下的温度分布,并使用多项式拟合转子轴向温度分布;基于有限元方法推导柔性转子单元的动力学模型,引入温度影响,建立考虑温度影响的磁悬浮轴承转子系统整体动力学模型,并通过模态试验验证模型的准确性;基于理论动力学模型分析系统的动态特性.结果表明:温度升高会导致转子的前三阶支承模态频率下降,增大各阶幅频响应幅值;当温度从常温升至450℃时,转子的前三阶弯曲支承模态频率分别降低了3.818%、5.670%、3.183%,前三阶弯曲模态幅频响应幅值分别升高了83.4%、34.4%、24.1%.In the multi-electric aircraft engine,an active magnetic bearing can break through the limitation of temperature on the support part due to its high temperature resistance and non-contact characteristics,which enables its support part to be closer to the combustion chamber.In order to investigate the influence of temperature on the dynamic characteristics of the magnetic bearing-rotor system,a dynamics modeling method for a high-temperature magnetic bearing-rotor system was proposed.The temperature distributions of the rotor at different temperatures were obtained through simulation,and the axial temperature distribution of the rotor was fitted using polynomials.Based on the finite element method,the dynamics model of the flexible rotor unit was derived.The temperature influence was introduced,and the overall dynamics model of the magnetic bearingrotor system considering the temperature influence was established.The accuracy of the model was verified by a modal test.The dynamic characteristics of the system were analyzed based on the theoretical dynamics model,and the results show that an increase in temperature leads to a decrease in the first three orders of the support modal frequency of the rotor and an increase in the amplitude of the amplitude frequency response of each order.When the temperature increases from room temperature to 450℃,the first three orders of the bending support modal frequency of the rotor decrease by 3.818%,5.670%,and 3.183%,respectively,and the amplitudes of the first three orders of the bending modal amplitude frequency response increase by 83.4%,34.4%,and 24.1%,respectively.

关 键 词：有限元法 高温特性 磁悬浮轴承 动力学分析 航空发动机 

分 类 号：TH113.1[机械工程—机械设计及理论] V231.96[航空宇航科学与技术—航空宇航推进理论与工程]