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Supression of Rotor Instability

  • N. F. Rieger
Part of the International Centre for Mechanical Sciences book series (CISM, volume 273)

Abstract

The following principles are effective for increasing the stable operating speed range of a rotor:
  1. a.

    raise the lowest, critical speed of the system

     
  2. b.

    increase the external system damping

     
The first requirement can be achieved by increasing the bearing radial stiffness or the bending stiffness of the rotor, or both. The second requirement can be met by using a bearing or support type which inherently contains more non-rotating velocity damping. It should be noted that the increase of any damping which rotates with the shaft itself has a stabilizing effect below the bending critical speed, and a destabilizing effect above the bending critical speed.

Keywords

Critical Speed Journal Bearing Thrust Bearing Rotor Instability Squeeze Film 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Pinkus, O.J., “Experimental Investigation of Resonant Whip,” Trans. ASME, Vol. 87, p. 975 (1956).Google Scholar
  2. 2.
    Tondl, A., “Notes on the Problem of Self-Excited Vibrations and Non-Linear Resonances of Rotors Supported in Several Journal Bearings,” Wear, 8 (1965).Google Scholar
  3. 3.
    Smith, D.M., “Journal Bearings in Turbomachinery,” Chapman and Hall, Ltd. (1970).Google Scholar
  4. 4.
    Newkirk, B.L. and Grobel, L.P., “Oil Film Whirl - A Non-Whirling Bearing,” Trans. ASME, Vol. 56, p. 607 (1934).Google Scholar
  5. 5.
    Sherwood, R.S., “How to Prevent Oil Film Whirl in Journal Bearings,” Machine Design, p. 163 (December, 1953 ).Google Scholar
  6. 6.
    Hori, Y., “A Theory of Oil Whip,” Journal of Applied Mech., p. 189 (June, 1959 ).Google Scholar
  7. 7.
    Lund, J.W., “Stability and Damped Critical Speeds of a Flexible Rotor in Fluid-Film Bearings,” Journal of Engineering for Industry, Trans. ASME, p. 509 (May, 1976 ).Google Scholar
  8. 8.
    Newkirk, B.L., “Shaft Whipping,” General Electric Rev. (1924).Google Scholar
  9. 9.
    Kimball, A.J., “Internal Friction Theory of Shaft Whirling,” General Electric Report, Vol. 17, p. 266 (1926).Google Scholar
  10. 10.
    Robertson, D., “Hysteretic Influences on the Whirling of Rotors,” Proc. Inst. of Mech. Eng., Vol. 131, p. 513 (1935).CrossRefGoogle Scholar
  11. 11.
    Lund, J.W. and Tonnessen, J., “Some Experiments on Instability of Rotors Supported in Fluid-Film Bearings,” ASME Paper No. 77-DET-23 (1977).Google Scholar
  12. 12.
    Cunningham, R.E., “Steady-State Unbalance Response of a Three-Disk Flexible Damped Support,” ASME Paper No. 77 DET-102.Google Scholar
  13. 13.
    DeChoudhury, P. and Gunter, E.J., “Dynamic Stability of Flexible Rotor–Bearing Systems,” Report No. ME–6060–106–700, University of Virginia (1970).Google Scholar
  14. 14.
    Newkirk and Lewis, “Oil Film Whirl, an Investigation of Disturbances due to Oil Films in Journal Bearings,” Trans. ASME, Vol. 78, p. 21 (1951).Google Scholar
  15. 15.
    Tondl, A., “Some Problems of Rotor Dynamics,” Publishing House of the Czechoslovak Academy of Sciences, Prague (1965).Google Scholar
  16. 16.
    Smalley, A.J., Darlow, M.S., Paper included in “Topics in Fluid Film Bearings and Rotor Bearing System Design and Optimization,” ASME (1978).Google Scholar
  17. 17.
    Cundiff, R., “Thrust Bearing Effects on Rotor Stability,” MTI Report No. AFAPL-TR-65–45, Part IX.Google Scholar
  18. 18.
    Lund, J.W., “The Threshold of Instability of a Flexible Rotor in Fluid-Film Bearings,” MTI Unpublished Technical Memorandum (1971).Google Scholar
  19. 19.
    Giberson, N.F., “Non-Linear Dynamics and Stability of Rotor-Bearing Systems,” Rotordynamic Symposium and Workshop, Rochester Institute of Technology (1975).Google Scholar
  20. 20.
    Gunter, E.J., “The Influence of Internal Friction on the Stability of High Speed Rotors with Anisotropic Supports,” ASME Paper No. 69.Google Scholar
  21. 21.
    Pan, C. H. T., “On the Time Dependent. Effects of Self-Acting Gas Bearings,” Mech. Techn. Inc. Report 62TR1, ONR Contract No. 3730(00), (February, 1962 ).Google Scholar
  22. 22.
    Rieger, N.F., Thomas, C.B., Jr., “Some Recent Computer Studies on the Stability of Rotors in Fluid-Film Bearings,” International Union of Theoretical and Applied Mechanics, Proc. Dynamics of Rotors Symposium, Lyngby, Denmark, p. 436 (August 12–16, 1974 ).Google Scholar
  23. 23.
    Voorhees, J.E., Mellor, CC., and Dubensky, R.G., “The Dynamic Behavior of Hypercritical-speed Shafts,” Army Research Office, Proc. of the Army Conf. on Dynamic Behavior of Material and Structures, held at Springfield Armory, Springfield, Mass., Sept. 26–28, 1962.Google Scholar

Copyright information

© Springer-Verlag Wien 1984

Authors and Affiliations

  • N. F. Rieger

There are no affiliations available

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