An active auxiliary bearing control strategy to reduce the onset of asynchronous periodic contact modes in rotor/magnetic bearing systems

Iain Cade, M Necip Sahinkaya, Clifford Burrows, Patrick Keogh

Research output: Chapter in Book/Report/Conference proceedingChapter

  • 3 Citations

Abstract

To prevent rotor/stator contact in a rotor/magnetic bearing system, auxiliary bearings may be located along the shaft and at the magnetic bearings. Rotor responses after a contact event may include periodic trapped modes where repeated contact may lead to highly localized thermal stresses. This paper considers an active auxiliary bearing system with a control strategy designed to limit the trapped contact modes in a rotor/magnetic bearing system that are induced by rotor unbalance. The controller is evaluated from a system model and its responses to short duration contact events. An active auxiliary bearing model is introduced to the system where the dynamic response of the bearing is dependent on the controller. From a harmonic decomposition of rotor/bearing contact, dynamic controllers are sought which limit the numbers of possible periodic solutions for a given rotor unbalance and operating speed. A case study is performed considering a simple two degree of freedom system with passive and active auxiliary bearings. Recovery of a rotor trapped in an asynchronous contact mode is shown with variation of the auxiliary bearing controller parameters.
LanguageEnglish
Title of host publicationProceedings of the ASME Turbo Expo 2009
Place of PublicationNew York
PublisherASME
Pages855-865
Number of pages11
Volume6
ISBN (Print)9780791848876
StatusPublished - Jun 2009
EventASME Turbo Expo - Orlando, FL, USA United States
Duration: 8 Jun 200912 Jun 2009

Conference

ConferenceASME Turbo Expo
CountryUSA United States
CityOrlando, FL
Period8/06/0912/06/09

Fingerprint

Bearings (structural)
Magnetic bearings
Rotors
Controllers
Thermal stress
Stators
Dynamic response
Decomposition
Recovery

Cite this

Cade, I., Sahinkaya, M. N., Burrows, C., & Keogh, P. (2009). An active auxiliary bearing control strategy to reduce the onset of asynchronous periodic contact modes in rotor/magnetic bearing systems. In Proceedings of the ASME Turbo Expo 2009 (Vol. 6, pp. 855-865). New York: ASME.

An active auxiliary bearing control strategy to reduce the onset of asynchronous periodic contact modes in rotor/magnetic bearing systems. / Cade, Iain; Sahinkaya, M Necip; Burrows, Clifford; Keogh, Patrick.

Proceedings of the ASME Turbo Expo 2009. Vol. 6 New York : ASME, 2009. p. 855-865.

Research output: Chapter in Book/Report/Conference proceedingChapter

Cade, I, Sahinkaya, MN, Burrows, C & Keogh, P 2009, An active auxiliary bearing control strategy to reduce the onset of asynchronous periodic contact modes in rotor/magnetic bearing systems. in Proceedings of the ASME Turbo Expo 2009. vol. 6, ASME, New York, pp. 855-865, ASME Turbo Expo, Orlando, FL, USA United States, 8/06/09.
Cade I, Sahinkaya MN, Burrows C, Keogh P. An active auxiliary bearing control strategy to reduce the onset of asynchronous periodic contact modes in rotor/magnetic bearing systems. In Proceedings of the ASME Turbo Expo 2009. Vol. 6. New York: ASME. 2009. p. 855-865.
Cade, Iain ; Sahinkaya, M Necip ; Burrows, Clifford ; Keogh, Patrick. / An active auxiliary bearing control strategy to reduce the onset of asynchronous periodic contact modes in rotor/magnetic bearing systems. Proceedings of the ASME Turbo Expo 2009. Vol. 6 New York : ASME, 2009. pp. 855-865
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AB - To prevent rotor/stator contact in a rotor/magnetic bearing system, auxiliary bearings may be located along the shaft and at the magnetic bearings. Rotor responses after a contact event may include periodic trapped modes where repeated contact may lead to highly localized thermal stresses. This paper considers an active auxiliary bearing system with a control strategy designed to limit the trapped contact modes in a rotor/magnetic bearing system that are induced by rotor unbalance. The controller is evaluated from a system model and its responses to short duration contact events. An active auxiliary bearing model is introduced to the system where the dynamic response of the bearing is dependent on the controller. From a harmonic decomposition of rotor/bearing contact, dynamic controllers are sought which limit the numbers of possible periodic solutions for a given rotor unbalance and operating speed. A case study is performed considering a simple two degree of freedom system with passive and active auxiliary bearings. Recovery of a rotor trapped in an asynchronous contact mode is shown with variation of the auxiliary bearing controller parameters.

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