摘要
研究一个带磁轴承的转子系统,在磁轴承失灵后转子坠入备用轴承引起的非线性瞬态振动· 通过严格建立运动方程和数值仿真计算,详尽地分析了坠落转子转动角速度变化和轴颈与备用轴承接触点法向力变化的时间历程及备用轴承振动位移的频谱。
The nonlinear and transient vibration of a rotor, which dropped onto back_up bearings when its active magnetic bearings were out of order, was investigated. After strictly deriving its equations of motion and performing numerical simulations, the time_histories of rotating speed of the dropping rotor, and normal force at the rubbing contact point as well as the frequency spectrum of the vibration displacement of back_up bearings are fully analyzed. It is found that the strong and unsteady forced bending vibration of the unbalancced and damped rotor decelerating through its first bending vibtation of the unbalaned and damped rotor decelerating through its first critical speed as well as chattering at high frequencies caused by the non_linearity at the rubbing contact point between the journal and back_up bearings may lead to the catastrophic damage of the system.
出处
《应用数学和力学》
EI
CSCD
北大核心
2002年第11期1177-1182,共6页
Applied Mathematics and Mechanics
关键词
转子系统
磁轴承
过临界点瞬态响应
非线性碰摩
灾变机理
rotor system with active magnetic bearing
magnetic bearing failure
transient response passing through critical speed
non_linear rubbing
catastrophic mechanism