Study on Catastrophic Mechanism for Rotor Drop Transient Vibration Following Magnetic Bearing Failure
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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,发现系统发生灾变破坏的原因是由于高速不平衡阻尼转子减速通过临界速度时引起的强烈非稳态受迫弯曲振动加上轴颈与备用轴承接触点碰摩的非线性引起的高频颤振。Abstract: 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.
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[1] Ishii T, Kirk R G. Transient response technique applied to active magnetic bearing machinery during rotor drop[J].J Vibration & Acoustics,1996,118(2):154-163. [2] Kirk R G. Investigation of rotor drop transient response following active magnetic bearing failure in critical path turbomachinery[A]. In: Progress Report[C].VA Tech,USA: Dept of Mech Engrg,1997. [3] Allair P E. Rotor drop nonlinear transient analysis of magnetic bearing rotors on auxiliary bearings[A]. In: Proc 7th Conf on Nonlinear Vibration, Stability & Rotordynamics[C]. VA Tech Blacksburg, USA,1998. [4] Muszynska A. Partial lateral rotor to stator rubs[J]. I Mech E,1984,C281(84):327-335. [5] Muszynska A. Rotor-to-stationary element rub-related vibration phenomena in rotating machinery-literature survey[J]. Shock & Vibration Digest,1989,21(3):3-11. [6] Gelin A, Pugnet J M, Hagopian J D. Dynamic behavior of flexible rotors with active magnet bearings on safety auxiliary bearings[A]. In: Proc of 3rd International Conference on Rotordynamics[C]. Lyon,France,1990,503-508. [7] 方之楚,骆振黄. 质量任意分布下的柔性转子过临界点时的瞬态响应[J]. 固体力学学报,1990,11(1):11-22. -
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