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Experimental Rotordynamic Parameter Study at Turbochargers With Hydrodynamic Journal Bearing Systems

[+] Author Affiliations
Alexander T. Hummel, Michael Rott, David Kuschnertschuk, Günther Stelzner, Markus Müller, Johannes Leweux

Daimler AG, Stuttgart, Germany

Christoph Schneider

Lauer & Weiss GmbH, Fellbach, Germany

Paper No. GT2015-43434, pp. V07AT30A011; 11 pages
  • ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
  • Volume 7A: Structures and Dynamics
  • Montreal, Quebec, Canada, June 15–19, 2015
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5676-5
  • Copyright © 2015 by ASME


This paper presents an evaluation of various rotordynamic parameters at commercial vehicle turbochargers, which are operated supercritically in full-floating hydrodynamic journal bearing systems. The evaluation is conducted by using an experimental approach to determine the performance of the rotor-bearing-system in a real-life assembly at a hot gas test bench. This takes support stiffness, external heating and the excitation by seals, thrust bearings and gas forces into account, while Engine-specific excitation is not present. The system’s ability to carry additional unbalance load at different oil support pressures without the occurrence of mixed friction throughout a complete run-up is assessed. By executing this assessment for multiple assemblies with different bearings, rotors and oil types, the influence of main design and boundary parameters on the effective journal bearing performance of turbochargers is quantified.

Copyright © 2015 by ASME



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