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Improving stability and operation of turbine rotors using adjustable journal bearings.

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Title: Improving stability and operation of turbine rotors using adjustable journal bearings.
Authors: Chasalevris, Athanasios1 athanasios.chasalevris@ge.com, Dohnal, Fadi2 fadi.dohnal@gmx.at
Source: Tribology International. Dec2016, Vol. 104, p369-382. 14p.
Subjects: Turbine blades, Rotors, Journal bearings, Stability (Mechanics), Stiffness (Mechanics), Damping (Mechanics)
Abstract: A theoretical study on the application of parametric excitation through fluid film journal bearings in order to extend the stability margins is presented in this paper. The proposed 2-arc and 3-arc journal bearing configurations are able to provide periodical stiffness and damping variation in certain frequency and amplitude introducing parametric anti-resonances or resonances in the system, leading to stable or unstable operation respectively. Furthermore, the use of the proposed bearings as a mean for real time adjustment of the journal center and the shaft-line is highlighted for further investigation. The theoretical application of the proposed bearings to a medium size industrial steam turbine of higher speed demonstrates the extension of stability margins at rotating speeds even five times supercritical. [ABSTRACT FROM AUTHOR]
Copyright of Tribology International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 118523317
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
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  Data: Improving stability and operation of turbine rotors using adjustable journal bearings.
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  Data: <searchLink fieldCode="AR" term="%22Chasalevris%2C+Athanasios%22">Chasalevris, Athanasios</searchLink><relatesTo>1</relatesTo><i> athanasios.chasalevris@ge.com</i><br /><searchLink fieldCode="AR" term="%22Dohnal%2C+Fadi%22">Dohnal, Fadi</searchLink><relatesTo>2</relatesTo><i> fadi.dohnal@gmx.at</i>
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  Data: <searchLink fieldCode="JN" term="%22Tribology+International%22">Tribology International</searchLink>. Dec2016, Vol. 104, p369-382. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Turbine+blades%22">Turbine blades</searchLink><br /><searchLink fieldCode="DE" term="%22Rotors%22">Rotors</searchLink><br /><searchLink fieldCode="DE" term="%22Journal+bearings%22">Journal bearings</searchLink><br /><searchLink fieldCode="DE" term="%22Stability+%28Mechanics%29%22">Stability (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Stiffness+%28Mechanics%29%22">Stiffness (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Damping+%28Mechanics%29%22">Damping (Mechanics)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: A theoretical study on the application of parametric excitation through fluid film journal bearings in order to extend the stability margins is presented in this paper. The proposed 2-arc and 3-arc journal bearing configurations are able to provide periodical stiffness and damping variation in certain frequency and amplitude introducing parametric anti-resonances or resonances in the system, leading to stable or unstable operation respectively. Furthermore, the use of the proposed bearings as a mean for real time adjustment of the journal center and the shaft-line is highlighted for further investigation. The theoretical application of the proposed bearings to a medium size industrial steam turbine of higher speed demonstrates the extension of stability margins at rotating speeds even five times supercritical. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Tribology International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1016/j.triboint.2016.06.022
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 14
        StartPage: 369
    Subjects:
      – SubjectFull: Turbine blades
        Type: general
      – SubjectFull: Rotors
        Type: general
      – SubjectFull: Journal bearings
        Type: general
      – SubjectFull: Stability (Mechanics)
        Type: general
      – SubjectFull: Stiffness (Mechanics)
        Type: general
      – SubjectFull: Damping (Mechanics)
        Type: general
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      – TitleFull: Improving stability and operation of turbine rotors using adjustable journal bearings.
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            NameFull: Chasalevris, Athanasios
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            NameFull: Dohnal, Fadi
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              M: 12
              Text: Dec2016
              Type: published
              Y: 2016
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              Value: 104
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