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 bearing-rotor 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
Key words
finite element method/high-temperature properties/magnetic bearing/dynamics analysis/aircraft engine
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