Characteristics of a magnetically levitated flexible rotor when in contact with one or more auxiliary bearings

The case for installing auxiliary bearings in parallel with magnetic bearings is often made with regard to touchdown, when a complete system failure occurs. The work reported in this paper focuses on the case when rotor/auxiliary bearing contact occurs, but the magnetic bearings retain their functio...

Full description

Saved in:
Bibliographic Details
Main Authors: Keogh P.S., Seow Y.H., Cole M.O.T.
Format: Conference or Workshop Item
Language:English
Published: 2014
Online Access:http://www.scopus.com/inward/record.url?eid=2-s2.0-27744471287&partnerID=40&md5=e5b238baef482789b403c0201116db21
http://cmuir.cmu.ac.th/handle/6653943832/1273
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Chiang Mai University
Language: English
id th-cmuir.6653943832-1273
record_format dspace
spelling th-cmuir.6653943832-12732014-08-29T09:29:02Z Characteristics of a magnetically levitated flexible rotor when in contact with one or more auxiliary bearings Keogh P.S. Seow Y.H. Cole M.O.T. The case for installing auxiliary bearings in parallel with magnetic bearings is often made with regard to touchdown, when a complete system failure occurs. The work reported in this paper focuses on the case when rotor/auxiliary bearing contact occurs, but the magnetic bearings retain their functionality. One may envisage future transportation applications in which this situation would occur, for example, during high acceleration levels induced by turbulence. An understanding of the rotor dynamic response during contact conditions could enable auxiliary bearing life expectancy to be extended using appropriate control action from the still functional magnetic bearings. To achieve this, a system model is required for control strategy design purposes. This paper considers the development of a non-linear system model for predicting the contact dynamics in a flexible rotor/magnetic/auxiliary bearing system. Previous experimental work produced similar contact dynamic response characteristics; whether due to unbalance or circular forcing through a magnetic bearing. Initial model-based predictions of these tests did not provide sufficiently accurate reproduction of the measured orbits, particularly in the presence of auxiliary bearing misalignment and multi-plane rotor contact. Parameter variations are thus undertaken to investigate the reasons for these differences. Contrary to expectations, uncertainty in the magnetic bearing characteristics during contact conditions appears to offer an explanation. Copyright © 2005 by ASME. 2014-08-29T09:29:02Z 2014-08-29T09:29:02Z 2005 Conference Paper 66048 http://www.scopus.com/inward/record.url?eid=2-s2.0-27744471287&partnerID=40&md5=e5b238baef482789b403c0201116db21 http://cmuir.cmu.ac.th/handle/6653943832/1273 English
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
language English
description The case for installing auxiliary bearings in parallel with magnetic bearings is often made with regard to touchdown, when a complete system failure occurs. The work reported in this paper focuses on the case when rotor/auxiliary bearing contact occurs, but the magnetic bearings retain their functionality. One may envisage future transportation applications in which this situation would occur, for example, during high acceleration levels induced by turbulence. An understanding of the rotor dynamic response during contact conditions could enable auxiliary bearing life expectancy to be extended using appropriate control action from the still functional magnetic bearings. To achieve this, a system model is required for control strategy design purposes. This paper considers the development of a non-linear system model for predicting the contact dynamics in a flexible rotor/magnetic/auxiliary bearing system. Previous experimental work produced similar contact dynamic response characteristics; whether due to unbalance or circular forcing through a magnetic bearing. Initial model-based predictions of these tests did not provide sufficiently accurate reproduction of the measured orbits, particularly in the presence of auxiliary bearing misalignment and multi-plane rotor contact. Parameter variations are thus undertaken to investigate the reasons for these differences. Contrary to expectations, uncertainty in the magnetic bearing characteristics during contact conditions appears to offer an explanation. Copyright © 2005 by ASME.
format Conference or Workshop Item
author Keogh P.S.
Seow Y.H.
Cole M.O.T.
spellingShingle Keogh P.S.
Seow Y.H.
Cole M.O.T.
Characteristics of a magnetically levitated flexible rotor when in contact with one or more auxiliary bearings
author_facet Keogh P.S.
Seow Y.H.
Cole M.O.T.
author_sort Keogh P.S.
title Characteristics of a magnetically levitated flexible rotor when in contact with one or more auxiliary bearings
title_short Characteristics of a magnetically levitated flexible rotor when in contact with one or more auxiliary bearings
title_full Characteristics of a magnetically levitated flexible rotor when in contact with one or more auxiliary bearings
title_fullStr Characteristics of a magnetically levitated flexible rotor when in contact with one or more auxiliary bearings
title_full_unstemmed Characteristics of a magnetically levitated flexible rotor when in contact with one or more auxiliary bearings
title_sort characteristics of a magnetically levitated flexible rotor when in contact with one or more auxiliary bearings
publishDate 2014
url http://www.scopus.com/inward/record.url?eid=2-s2.0-27744471287&partnerID=40&md5=e5b238baef482789b403c0201116db21
http://cmuir.cmu.ac.th/handle/6653943832/1273
_version_ 1681419639827988480