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

Kirk, R. Gordon; Alsaeed, Ali A.

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

dc.contributor.author	Kirk, R. Gordon	en
dc.contributor.author	Alsaeed, Ali A.	en
dc.contributor.department	Mechanical Engineering	en
dc.date.accessioned	2017-09-18T09:56:11Z	en
dc.date.available	2017-09-18T09:56:11Z	en
dc.date.issued	2011-02-06	en
dc.date.updated	2017-09-18T09:56:11Z	en
dc.description.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.	en
dc.description.version	Published version	en
dc.format.mimetype	application/pdf	en
dc.identifier.citation	R. Gordon Kirk and Ali A. Alsaeed, “Induced Unbalance as a Method for Improving the Dynamic Stability of High-Speed Turbochargers,” International Journal of Rotating Machinery, vol. 2011, Article ID 952869, 9 pages, 2011. doi:10.1155/2011/952869	en
dc.identifier.doi	https://doi.org/10.1155/2011/952869	en
dc.identifier.uri	http://hdl.handle.net/10919/79033	en
dc.language.iso	en	en
dc.publisher	Hindawi	en
dc.rights	Creative Commons Attribution 4.0 International	en
dc.rights.holder	Copyright © 2011 R. Gordon Kirk and Ali A. Alsaeed. This 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.uri	http://creativecommons.org/licenses/by/4.0/	en
dc.title	Induced Unbalance as a Method for Improving the Dynamic Stability of High-Speed Turbochargers	en
dc.title.serial	International Journal of Rotating Machinery	en
dc.type	Article - Refereed	en
dc.type.dcmitype	Text	en