摘要
针对双转子系统不对中普遍存在,影响系统振动特性的问题,对内转子含有联轴器不对中的双转子系统进行了动力学仿真及振动分析。以某型航空发动机双转子系统为对象,通过施加不对中引发的附加载荷,建立双转子系统联轴器不对中动力学有限元模型。对比分析了特定工况下转子系统随不对中量增加,内外转子振动的频谱特征及轴心轨迹的变化规律。结果表明:内转子联轴器不对中振动特性可通过中介轴承传递到外转子,外转子支撑位置及中介轴承对应位置均可监测到内转子联轴器不对中振动响应;一倍频对联轴器不对中故障不敏感,二倍频幅值随联轴器不对中量的增加而增加,且距离联轴器越近的支撑位置的不对中响应越敏感;轴心轨迹随联轴器不对中量的增加由"椭圆"形变为"内八字"形。
For the problem of misalignment of a dual-rotor system, which affects the vibration characteristics of the system, the dynamic simulation and vibration analysis of the dual-rotor system with coupling misalignment in inner rotor are carried out. Taking a certain aero-engine as the structural object, the dynamic finite element model of the dual-rotor system with coupling misalignment in inner rotor is established by applying additional load caused by misalignment. The vibration spectrum characteristics and the shaft centerline orbits are compared with the increase of the misalignment of rotors. The results show that the vibration can be transferred via intershaft bearing that the vibration response caused by inner rotor coupling misalignment can be monitored both in the support position of the outer rotor and the corresponding position of the inter-bearing;the rotating frequency is not sensitive to coupling misalignment, while the second harmonic frequency is sensitive to coupling misalignment, whose amplitude increases with the increase of the coupling misalignment, and the closer the support position to the coupling, the more sensitive to the misalignment;the shaft centerline orbits are transformed from "ellipse" to the "inner eight" shape with the increase of the coupling misalignment.
作者
蒋玲莉
陈雨蒙
李学军
张宏献
Jiang Lingli;Chen Yumeng;Li Xuejun;Zhang Hongxian(Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment,Hunan University of Science and Technology, Hunan Xiangtan 411201, China)
出处
《机械科学与技术》
CSCD
北大核心
2019年第9期1350-1356,共7页
Mechanical Science and Technology for Aerospace Engineering
基金
国家自然科学基金项目(11672106,51575177)
湖湘青年英才项目(2017RS3049)资助
关键词
双转子系统
有限元模型
联轴器不对中
振动分析
轴心轨迹
dual-rotor system
dynamic model
aircraft engine
coupling misalignment
vibration analysis
shaft centerline orbit
harmonic frequency
intershaft bearing
