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Abstract: Dynamical
equations of a multi-disk multi-mass flexible rotor supported on active
magnetic bearings drop on flexible rolling element backup bearings
during power failure are developed by the finial element method, the
transient nonlinear dynamics of the rotor drop on the backup bearings
are analyzed on a multi-disk multi-mass flexible rotor and the influence
of support stiffness, support damping and radial clearance of the
flexible backup bearings on the transient behavior of the rotor is
examined. It is shown the rolling element backup bearing with
flexibility and more damping can greatly improve the dynamic behavior of
a rotor drop on rolling element backup bearings, suppress the full
clearance whirl motion with a large rotor vibration and impact force
acted on the backup bearings, and decrease the effect of rotor drop on
the life-time and reliability of backup bearings. The higher the support
damping, or the smaller the support stiffness, or the larger the backup
bearing’s clearance, the less the possibility for occurring the full
clearance whirl motion is.
Key words: Active
magnetic bearing Rotor Backup bearing FEM Drop
CLC No: TH113
中国航空科学基金(02C24007, 05C24005)、浙江省自然科学基金(R104129)资助项目.
Received 20050601, received in revised form 20060210
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