NDLI: Bifurcations in the response of a rigid rotor supported by load sharing between magnetic and auxiliary bearings

Content Provider	Springer Nature Link
Author	Inayat Hussain, Jawaid I.
Copyright Year	2010
Abstract	Auxiliary bearings are utilized in practical installations of magnetically suspended rotating machines with the main functions to provide support to the rotating machines during their non-operational period, and to protect the magnetic bearings and the rotating assembly from being damaged due to power loss during operation. The relatively small clearances of these bearings, which are typically half of that of the magnetic bearings, may at time cause contact between the rotor and these bearings to occur even during normal operation of the rotating machines. The work presented herein examines the bifurcations in the response of a rigid rotor supported by load sharing between magnetic and auxiliary bearings, which occurs during contact between the rotor and the auxiliary bearings. Numerical results revealed the occurrence of period-doubling bifurcation resulting in vibrations of period-2, -4, -8, -16 and -32, as well as quasi-periodic and chaotic vibrations. The results further showed that for a relatively small rotor imbalance magnitude, which is within the prescribed level of certain classes of practical rotating machinery, such nonlinear dynamical phenomena would not have been discovered had the auxiliary bearings forces been omitted in the model of the rotor-bearing system. As these bearings are essential elements in practical installations of magnetically supported rotating machines, failure to include them in the rotor-bearing model may result in incorrect prediction of the rotor’s vibration response.
Starting Page	1341
Ending Page	1351
Page Count	11
File Format	PDF
ISSN	00256455
Journal	Meccanica
Volume Number	46
Issue Number	6
e-ISSN	15729648
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-12-08
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Active magnetic bearing Auxiliary bearing Bifurcation Nonlinear Rotordynamics Civil Engineering Mechanics Automotive Engineering Mechanical Engineering
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Mechanical Engineering

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