NDLI: Non-Linear Behaviors in the Motion of a Magnetically Supported Rotor on the Catcher Bearing During Levitation Loss: An Experimental Description

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Cuesta, E. N. Rastelli, V. R. Medina, L. U. Montbrun, N. I. Diaz, S. E.
Copyright Year	2002
Abstract	Recent developments improving load capacity foretell the practical implementation of Active Magnetic Bearings (AMB) on industrial level, pushed by the advantages of reduced wear and higher speeds that they make available. However, the possibility of an eventual power failure forces the use of back-up (catcher) bearings, which usually are of the ball bearing type. The back-up bearings present a clearance between the shaft and the inner race, such that there is not contact during normal operation. On a power failure or an emergency stop, the rotor is only supported by the catcher bearings. Thus, the rotor motion within the clearance results on a succession of impacts, contact and non-contact intervals producing a non-linear behavior of the system. The complexity of this non-linear behavior prevents the use of traditional methods for the design of the catcher bearings, calling for the need of extensive experimentation and previous experience in their dimensioning process. Here, the response of a rigid rotor, supported by a pivot on the drive side and a magnetic bearing on the other side, is measured during the emergency stop from several operating speeds. Non-linear analysis tools, such as Poincare´ Maps and Bifurcation Diagrams, are employed to demonstrate the non-linear characteristics of the motion, which in some conditions is shown to become chaotic with a vibration limit cycle. The rotor motion on the catcher bearings (with the magnetic bearing deactivated) is measured at constant running speeds. The limit cycles and chaotic attractors are described, showing the relation of the non-linear effects to the rotational speed.
Sponsorship	International Gas Turbine Institute
Starting Page	607
Ending Page	614
Page Count	8
File Format	PDF
ISBN	0791836096
DOI	10.1115/GT2002-30293
e-ISBN	0791836010
Volume Number	Volume 4: Turbo Expo 2002, Parts A and B
Conference Proceedings	ASME Turbo Expo 2002: Power for Land, Sea, and Air
Language	English
Publisher Date	2002-06-03
Publisher Place	Amsterdam, The Netherlands
Access Restriction	Subscribed
Subject Keyword	Vibration Ball bearings Bearings Rotors Levitation Clearances (engineering) Emergencies Bifurcation Attractors Dimensions Limit cycles Magnetic bearings Stress Design Wear Failure
Content Type	Text
Resource Type	Article

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