Induced Unbalance as a Method for Improving the Dynamic Stability of High-Speed Turbochargers

Handle URI:
http://hdl.handle.net/10754/596998
Title:
Induced Unbalance as a Method for Improving the Dynamic Stability of High-Speed Turbochargers
Authors:
Gordon Kirk, R.; Alsaeed, Ali A.
Abstract:
The high-speed diesel engine turbocharger is known to have subsynchronous vibrations for a wide speed range. The bearing fluid-film instability is the main source of the vibration. The nonlinear forces inside the bearings are causing the rotor to whirl in a limit cycle. This study presents a new method for improving the dynamic stability by inducing the turbocharger rotor unbalance in order to suppress the subsynchronous vibration. The finite-element model of the turbocharger with floating-ring bearings is numerically solved for the nonlinear time-transient response. Both compressor and turbine added unbalance are induced and the dynamic stability is computed. The turbocharger model with linearized floating-ring bearings is also solved for eigenvalues to predict the modes of instability. The linear analysis demonstrates that the forward whirling mode of the floating-ring at the compressor end also becomes unstable at the higher turbocharger speeds, in addition to the unstable forward conical and cylindrical modes. The numerical predictions are also compared to the former experimental results of a similar turbocharger. The results of the study show that the subsynchronous frequency amplitude of the dominant first mode is reduced when inducing either the compressor or the turbine unbalance at a certain level. © 2011 R. Gordon Kirk and Ali A. Alsaeed.
Citation:
Gordon Kirk R, Alsaeed AA (2011) Induced Unbalance as a Method for Improving the Dynamic Stability of High-Speed Turbochargers. International Journal of Rotating Machinery 2011: 1–9. Available: http://dx.doi.org/10.1155/2011/952869.
Publisher:
Hindawi Publishing Corporation
Journal:
International Journal of Rotating Machinery
Issue Date:
2011
DOI:
10.1155/2011/952869
Type:
Article
ISSN:
1023-621X; 1542-3034
Sponsors:
The authors would like to acknowledge the generous financial support from King Fahd University of Petroleum and Minerals and King Abdullah University of Science and Technology to conduct this research.
Appears in Collections:
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Full metadata record

DC FieldValue Language
dc.contributor.authorGordon Kirk, R.en
dc.contributor.authorAlsaeed, Ali A.en
dc.date.accessioned2016-02-23T13:52:08Zen
dc.date.available2016-02-23T13:52:08Zen
dc.date.issued2011en
dc.identifier.citationGordon Kirk R, Alsaeed AA (2011) Induced Unbalance as a Method for Improving the Dynamic Stability of High-Speed Turbochargers. International Journal of Rotating Machinery 2011: 1–9. Available: http://dx.doi.org/10.1155/2011/952869.en
dc.identifier.issn1023-621Xen
dc.identifier.issn1542-3034en
dc.identifier.doi10.1155/2011/952869en
dc.identifier.urihttp://hdl.handle.net/10754/596998en
dc.description.abstractThe high-speed diesel engine turbocharger is known to have subsynchronous vibrations for a wide speed range. The bearing fluid-film instability is the main source of the vibration. The nonlinear forces inside the bearings are causing the rotor to whirl in a limit cycle. This study presents a new method for improving the dynamic stability by inducing the turbocharger rotor unbalance in order to suppress the subsynchronous vibration. The finite-element model of the turbocharger with floating-ring bearings is numerically solved for the nonlinear time-transient response. Both compressor and turbine added unbalance are induced and the dynamic stability is computed. The turbocharger model with linearized floating-ring bearings is also solved for eigenvalues to predict the modes of instability. The linear analysis demonstrates that the forward whirling mode of the floating-ring at the compressor end also becomes unstable at the higher turbocharger speeds, in addition to the unstable forward conical and cylindrical modes. The numerical predictions are also compared to the former experimental results of a similar turbocharger. The results of the study show that the subsynchronous frequency amplitude of the dominant first mode is reduced when inducing either the compressor or the turbine unbalance at a certain level. © 2011 R. Gordon Kirk and Ali A. Alsaeed.en
dc.description.sponsorshipThe authors would like to acknowledge the generous financial support from King Fahd University of Petroleum and Minerals and King Abdullah University of Science and Technology to conduct this research.en
dc.publisherHindawi Publishing Corporationen
dc.rightsThis is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.en
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/en
dc.titleInduced Unbalance as a Method for Improving the Dynamic Stability of High-Speed Turbochargersen
dc.typeArticleen
dc.identifier.journalInternational Journal of Rotating Machineryen
dc.contributor.institutionVirginia Polytechnic Institute and State University, Blacksburg, United Statesen
dc.contributor.institutionKing Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabiaen
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