Nonlinear Rotordynamics of Turbochargers

  • Hung Nguyen-SchäferEmail author

Boundary Conditions of the Rotordynamics

Some uncertain boundary conditions play a key role for the stability and functionality of the rotor, as shown in Fig. 7.1. Unfortunately, it is very difficult or impossible to take all of them into account in the rotordynamic computation where only the rotor containing the compressor, turbine wheels, rotor shaft, radial bearings, and seal rings is considered. Normally, the boundary conditions are generally assumed ideal in the computation, such as sufficient supply oil, good parallelism of the thrust bearing, all wedges of the thrust bearing having the same slope, good quality of the radial bearing in terms of the bearing non-coaxiality, non-roundness, and characteristics of surface roughness. Therefore, the rotordynamic computation cannot cure the instability and malfunctions of the rotor, or prevent it from damages at inappropriate boundary conditions, like oil insufficiency, oil contaminated with hard particles, foamy oil, or oil coking in the bearing in the operation. However, the computational results help us better to understand the rotor response. Therefore, further improvements could be done for the rotor stability and reduction of the bearing friction. Additionally, experimental measurements also provide us with the real rotor response at such unknown boundary conditions that one could not consider in the computation.


Frequency Order Rotor Response Turbine Wheel Bearing Clearance Compressor Wheel 
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  1. 1.
    Adams Jr., M.L.: Rotating Machinery Vibration. CRC, Taylor and Francis (2001)Google Scholar
  2. 2.
    Bently, D.E., Hatch, C.: Fundamentals of Rotating Machinery Diagnostics. Bently Pressurized Bearing Press (2002)Google Scholar
  3. 3.
    Childs, D.: Turbomachinery Rotordynamics. J. Wiley and Sons Inc. (1993)Google Scholar
  4. 4.
    Ehrich, F.: Handbook of Rotordynamics. Krieger Publishing Company (2004)Google Scholar
  5. 5.
    Gasch, R., Nordmann, R., Pfuetzner, H.: Rotordynamik, vol. 2. Auflage, Springer (2006)Google Scholar
  6. 6.
    Genta, G.: Dynamics of Rotating Systems. Springer, Heidelberg (2005)Google Scholar
  7. 7.
    Hori, Y.: Hydrodynamic lubrication. Springer, Heidelberg (2006)Google Scholar
  8. 8.
    Kraemer, E.: Rotordynamics of Rotors and Foundations. Springer, Heidelberg (1993)Google Scholar
  9. 9.
    Kothe, P., Ahrens, T., Kleinschmidt, R.: Measurements of Rotordynamics of Turbochargers. Internal Report BMTS (2010)Google Scholar
  10. 10.
    MADYN 2000: Program of Computational Rotordynamics. Delta JS (2011)Google Scholar
  11. 11.
    Muszýnska, A.: Rotordynamics. CRC, Taylor and Francis (2005)Google Scholar
  12. 12.
    Newland, D.E.: An Introduction to Random Vibrations, Spectral & Wavelet Analysis, 3rd edn. Dover Publications Inc. (2005)Google Scholar
  13. 13.
    Nguyen-Schaefer, H., Sprafke, P.: Numerical Study on Interaction Effects of the Bubbles induced by Air-Release and Cavitation in Hydraulic Systems. In: Tenth Bath International Fluid Power Workshop. Research Studies Press, Bath (1997)Google Scholar
  14. 14.
    Nordmann, R.: Schwingungsberechnung von nichtkonservativen Rotoren mit Hilfe von Links- und Rechts-Eigenvektoren. VDI Bericht 269 (1976)Google Scholar
  15. 15.
    Rao, J.S.: Rotor Dynamics, 3rd edn. New Age Intl. Publishers (2007)Google Scholar
  16. 16.
    Rieger, N.F.: Rotordynamics 2 - Problems in Turbomachinery. CISM Courses and Lectures No. 297 (1988)Google Scholar
  17. 17.
    Rieger, N.F.: Balancing of Rigid and Flexible Rotors. U.S. DoD (1986)Google Scholar
  18. 18.
    Vance, J.: Rotordynamics of Turbomachinery. J. Wiley and Sons Inc. (1988)Google Scholar
  19. 19.
    Yamamoto, T., Ishida, Y.: Linear and Nonlinear Rotordynamics. J. Wiley and Sons Inc. (2001)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Platform Development Dept. ETBBosch Mahle Turbo Systems GmbH & Co. KGStuttgartGermany

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