Alignment Identification of Multi-Bearing Rotor Systems

  • J. M. Krodkiewski
  • J. Ding
  • Z. A. Parszewski
Conference paper


A general approach has been developed for on-site identification of the actual configuration (alignment) of multi-bearing rotor systems (e.g. a turbogenerator unit). Identification procedure is based on the monitored trajectories of the relative motion of rotor journals with respect to the bearings and a nonlinear mathematical model of the system considered. The mathematical model includes the dynamic properties of rotors, their foundation and supporting structures as well as the nonlinear properties of the oil bearings. Time integration of the nonlinear equations of motion along the measured trajectories yields the desired configuration parameters (relative transverse positions of the bearing centers). The derived procedure of the identification was verified by means of a computer simulation as well as an experimental investigation on a four-bearing rotor test installation. Results may be used for diagnosis of vibrations of rotating machinery as well as their vibration response correction or optimization.


Hydrodynamic Force Journal Bearing Radial Clearance Nonlinear Simulation Numerical Verification 
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  1. 1.
    Parszewski, Z. A. and Krodkiewski, M. J., “Machine Dynamics in Terms of the System Configuration Parameters”, IFToMM JSME. Inter. Conf. of Rotordynamics, Tokyo, 1986.Google Scholar
  2. 2.
    Hori, Y. and Uematsu, R., “Influence of Misalignment of Support Journal Bearings on Stability of a Multi—Rotor System”, Tribology International, Vol.13, No.5, 1980, pp.249.CrossRefGoogle Scholar
  3. 3.
    Hashemi, Y., “Alignment Changes and their Effects on the Operation and Integrity of Large Turbine Generators: Experience in the CEGB South Eastern Region”, Steam and Gas Turbine Foundation and Shaft Alignment, I. Mech. Eng. Conf. Publ. 1983, pp. 19.Google Scholar
  4. 4.
    Parszewski, Z. A., Krynicki, K. and Kirby, E., “Effect of Bearing Alignment on Stability Threshold and Post—Stability Behavior of Rotor Bearing Systems”, Conf. C366, I.Mech. E, 1988.Google Scholar
  5. 5.
    Parszewski, Z. A. and Li, D. X., “Dynamically Optimum Configuration for a Multi—Bearing Rotor System—Theory and Experiments”, International Symposium for Dynamics and Design, 1989, pp.279–284.Google Scholar
  6. 6.
    Lund, J. W., “The Stability of an Elastic Rotor in Journal Bearings with Flexible, Damped Supports”, Journal of Applied Mechanics, Tran. ASME, Ser. E Vol.87, No.4, 1965, pp.99.Google Scholar
  7. 7.
    Morton, P. G., “Analysis of Rotors Supported upon Many Bearings”, Journal of Mech. Eng. Science, Vol.14, No.1, 1972, pp.25.CrossRefMathSciNetGoogle Scholar
  8. 8.
    Kirk, R. G. and Gunter, E. J., “Nonlinear Transient Analysis of Multi—Mass Flexible Rotors—Theory and Application”, NASA CR—2300, 1973.Google Scholar
  9. 9.
    Lund, J. W., “Modal Response of a Flexible Rotor in Fluid—Film Bearings”, Journal of Engineering for Industry, Transactions of the ASME, 1974, pp.525.Google Scholar

Copyright information

© Springer-Verlag London Limited 1992

Authors and Affiliations

  • J. M. Krodkiewski
    • 1
  • J. Ding
    • 1
  • Z. A. Parszewski
    • 1
  1. 1.Department of Mechanical EngineeringUniversity of MelbourneParkvilleAustralia

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