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Influence of Bearing Geometry of Automotive Turbochargers on the Nonlinear Vibrations During Run-Up

  • Elmar WoschkeEmail author
  • Stefan Göbel
  • Steffen Nitzschke
  • Christian Daniel
  • Jens Strackeljan
Conference paper
Part of the Mechanisms and Machine Science book series (Mechan. Machine Science, volume 21)

Abstract

This paper deals with the simulation of turbochargers run-up behaviour. To predict the main design criterions for turbocharger applications like vibrations, friction power loss, minimal gap etc. a detailed and efficient computation is needed. The rotor dynamic simulation of the turbocharger is, due to the nonlinearities resulting from the oil-film, interacting with rotor shaft bending, done within an appropriate multibody simulation. By reason of turbines high rotational speed full-floating-rings are used to reduce the oil velocity gradient in the fluid-films. The bearings are modeled based on a transient numerical solution of Reynolds’ equation at each step of time integration. The pressure distribution can be affected by geometrical modifications like annular grooves in the full-floating-rings. The effect of these changes on the run-up behaviour of an automotive turbocharger is being studied. In addition the cause of jumps between subsynchronous vibrations will be shown for an explicit turbocharger.

Keywords

Full-floating-ring bearing Turbocharger Multibody simulation Annular groove Subsynchronous vibration Whirl Whip 

References

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Elmar Woschke
    • 1
    Email author
  • Stefan Göbel
    • 1
  • Steffen Nitzschke
    • 1
  • Christian Daniel
    • 1
  • Jens Strackeljan
    • 1
  1. 1.Institute of Mechanics (Technical Dynamics)Otto-Von-Guericke-UniversityMagdeburgGermany

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