搭接-叠片式箔片气体动压轴承转子动力学特性实验研究  

A rotor dynamics experimental study on lapped-laminated gas foil bearing

作　　者：管玉坤 朱鹏程 张振 冯凯 GUAN Yu-kun;ZHU Peng-cheng;ZHANG Zhen;FENG Kai(College of Mechanical and Vehicle Engineering,Hunan University,Changsha 410082,China;AECC Hunan Aviation Powerplant Research Institute,Zhuzhou 412001,China)

机构地区：[1]湖南大学机械与运载工程学院,湖南长沙410082 [2]中国航发湖南动力机械研究所,湖南株洲412001

出　　处：《振动工程学报》2024年第4期623-631,共9页Journal of Vibration Engineering

基　　金：国家重点研发计划课题资助项目(2021YFF0600208)。

摘　　要：本文研制了由搭接式径向轴承和叠片式推力轴承组成的一套搭接-叠片式箔片气体动压轴承,同时设计并搭建了相应的箔片气体动压轴承转子实验台,通过多组转子降速对比实验研究了所提出箔片气体动压轴承的起飞特性,分析了转子不平衡量和外部载荷对该轴承-转子系统的转子动力学影响。起飞实验结果表明,本文所研制的搭接式径向箔片气体动压轴承的起飞转速约为7500 r/min,最大起飞转矩约为220 N·mm。转子降速实验研究结果表明,随着转子不平衡量的增加,转子系统1X频振动幅值逐渐增大、二阶临界转速逐渐降低、次频振动发生频率逐渐提前;随着转子转速的增加,转子系统1X频振动呈现先增大后减小的趋势、次频振动幅值整体逐渐增大;在减小顶箔结构的圆心距后,转子系统稳定性增加。不平衡量与外部载荷加载耦合实验结果表明,不平衡量与外部载荷都会激起系统的次频振动,次频振动幅值随转速升高而增大;并且在激起次频振动方面,不平衡量与外部载荷之间存在着相互放大作用。In this paper,a set of overlapped and laminated foil aerodynamic bearings was developed,which was composed of overlapped radial bearings and laminated thrust bearings.Meanwhile,a rotor test bench of the foil aerodynamic bearings was designed and built.The take-off characteristics of the proposed foil aerodynamic bearings were studied by comparing the speed drop experiments of multiple groups of rotors.The influence of rotor unbalance and external load on the rotor dynamics of the bearing-rotor system was analyzed.The take-off test results show that the take-off speed of the radial foil pneumatic bearing developed in this paper is about 7500 r/min,and the maximum take-off torque is about 220 N•mm.The experimental results show that with the increase of rotor unbalance,the 1X frequency vibration amplitude increases gradually,the second critical speed decreases gradually,and the frequency of secondary frequency vibration increases gradually.With the increase of rotor speed,1X frequency vibration of the rotor system firstly increases and then decreases,and the amplitude of secondary frequency vibration increases gradually.When the center distance of the top foil structure is reduced,the stability of the rotor system increases.The experimental results show that both the unbalance and the external load excite the secondary frequency vibration of the system,and the amplitude of the secondary frequency vibration increases with the increase of the rotational speed.Moreover,the unbalance and the external load have obvious amplifying effect on each other in the excitation of secondary frequency.

关 键 词：转子动力学 气体轴承 转子试验台 不平衡量 外部载荷 

分 类 号：O347.6[理学—固体力学] TH133.35[理学—力学]