New LMI based gain-scheduling control for recovering contact-free operation of a magnetically levitated rotor

© 2017 Elsevier Ltd A new approach for the recovery of contact-free levitation of a rotor supported by active magnetic bearings (AMB) is assessed through control strategy design, system modelling and experimental verification. The rotor is considered to make contact with a touchdown bearing (TDB), w...

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Main Authors: Wang M., Cole M., Keogh P.
Format: Journal
Published: 2017
Online Access:https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85019062010&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/40072
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-400722017-09-28T03:57:40Z New LMI based gain-scheduling control for recovering contact-free operation of a magnetically levitated rotor Wang M. Cole M. Keogh P. © 2017 Elsevier Ltd A new approach for the recovery of contact-free levitation of a rotor supported by active magnetic bearings (AMB) is assessed through control strategy design, system modelling and experimental verification. The rotor is considered to make contact with a touchdown bearing (TDB), which may lead to entrapment in a bi-stable nonlinear response. A linear matrix inequality (LMI) based gain-scheduling H ∞ control technique is introduced to recover the rotor to a contact-free state. The controller formulation involves a time-varying effective stiffness parameter, which can be evaluated in terms of forces transmitted through the TDB. Rather than measuring these forces directly, an observer is introduced with a model of the base structure to transform base acceleration signals using polytopic coordinates for controller adjustment. Force transmission to the supporting base structure will occur either through an AMB alone without contact, or through the AMB and TDB with contact and this must be accounted for in the observer design. The controller is verified experimentally in terms of (a) non-contact robust stability and vibration suppression performance; (b) control action for contact-free recovery at typical running speeds with various unbalance and TDB misalignment conditions; and (c) coast-down experimental tests. The results demonstrate the effectiveness of the AMB control action whenever it operates within its dynamic load capacity. 2017-09-28T03:57:40Z 2017-09-28T03:57:40Z Journal 08883270 2-s2.0-85019062010 10.1016/j.ymssp.2017.04.008 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85019062010&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/40072
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
description © 2017 Elsevier Ltd A new approach for the recovery of contact-free levitation of a rotor supported by active magnetic bearings (AMB) is assessed through control strategy design, system modelling and experimental verification. The rotor is considered to make contact with a touchdown bearing (TDB), which may lead to entrapment in a bi-stable nonlinear response. A linear matrix inequality (LMI) based gain-scheduling H ∞ control technique is introduced to recover the rotor to a contact-free state. The controller formulation involves a time-varying effective stiffness parameter, which can be evaluated in terms of forces transmitted through the TDB. Rather than measuring these forces directly, an observer is introduced with a model of the base structure to transform base acceleration signals using polytopic coordinates for controller adjustment. Force transmission to the supporting base structure will occur either through an AMB alone without contact, or through the AMB and TDB with contact and this must be accounted for in the observer design. The controller is verified experimentally in terms of (a) non-contact robust stability and vibration suppression performance; (b) control action for contact-free recovery at typical running speeds with various unbalance and TDB misalignment conditions; and (c) coast-down experimental tests. The results demonstrate the effectiveness of the AMB control action whenever it operates within its dynamic load capacity.
format Journal
author Wang M.
Cole M.
Keogh P.
spellingShingle Wang M.
Cole M.
Keogh P.
New LMI based gain-scheduling control for recovering contact-free operation of a magnetically levitated rotor
author_facet Wang M.
Cole M.
Keogh P.
author_sort Wang M.
title New LMI based gain-scheduling control for recovering contact-free operation of a magnetically levitated rotor
title_short New LMI based gain-scheduling control for recovering contact-free operation of a magnetically levitated rotor
title_full New LMI based gain-scheduling control for recovering contact-free operation of a magnetically levitated rotor
title_fullStr New LMI based gain-scheduling control for recovering contact-free operation of a magnetically levitated rotor
title_full_unstemmed New LMI based gain-scheduling control for recovering contact-free operation of a magnetically levitated rotor
title_sort new lmi based gain-scheduling control for recovering contact-free operation of a magnetically levitated rotor
publishDate 2017
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85019062010&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/40072
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