On identyfying the configuration state of rotor bearing systems

• Autorzy: Hu W. , Feng N. S. , Hahn E. J.
• Języki publikacji: EN

Abstrakty

EN

In statically indeterminate rotor bearing systems involving hydrodynamic bearings, the relative lateral alignment of the bearing housings, i.e. the system configuration state, has a significant influence on the system stability and its vibration behaviour. This paper deals with a general identification procedure for determining the configuration state of any statically indeterminate system with hydrodynamic bearings. The technique is illustrated via numerical experiments using a fictitious four bearing system; and utilises the knowledge of the relative motion of the flexible rotors in their respective housing and of the absolute motion of the flexibly supported bearing housings, information which is now frequently available in existing turbomachinery installations. It is shown that acceptable configuration state identification is obtained even with 5% measurement uncertainty, here simulated by truncating all numerical 'measurements' to two significant digits. Since 5% measurement uncertainty is attainable with present measurement instrumentation, the identification technique is expected to be practically realisable.

Słowa kluczowe

EN

lateral misalignment; identification; configuration state; rotor bearing systems; hydrodynamic journal bearings

PL

hydrodynamika; łożysko hydrodynamiczne; wirnik

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2002
• Tom: Vol. 7, no 3
• Strony: 803--812
• Opis fizyczny: Bibliogr. 6 poz., tab., wykr.

Twórcy

autor

Hu W.

• School of Mechanical and Manufacturing Engineering University of New South Wales Sydney, NSW 2052, AUSTRALIA

autor

Feng N. S.

• School of Mechanical and Manufacturing Engineering University of New South Wales Sydney, NSW 2052, AUSTRALIA

autor

Hahn E. J.

• School of Mechanical and Manufacturing Engineering University of New South Wales Sydney, NSW 2052, AUSTRALIA

Bibliografia

• [1] Ding J. and Krodkiewski J.M. (1993): Inclusion of static indetermination in the mathematical model for non-linear dynamic analysis of multi-bearing rotor system. - Journal of Sound and Vibration, vol. 164, pp.267-280.
• [2] Feng N.S. and Hahn E.J. (1998a): Vibration analysis of statically indeterminate rotors with hydrodynamic bearings. - Journal of Tribology, Trans. ASME, vol. 120, pp.781-788.
• [3] Feng N.S. and Hahn E.J. (1998b): Pedestal identification in rotor-bearing-systems using non-linear force evaluation. - Proceedings ISMA23, Noise and Vibration Engineering Conference, Leuven, September 16-18, 1998, pp. 1487-1454.
• [4] Feng N.S. and Hahn E.J. (2001): Identification of pedestal parameters in rotor-bearing- pedestal systems using known unbalance. - Proc. ASME DETC’01, Paper NO.DETC2001/VIB-21533, Pittsburgh, CD-Rom.
• [5] Hori Y. and Uematsu R. (1990): Influence of misalignment of support journal bearings on stability of a multi-rotor system. - Tribology International, vol. 13, pp. 149-152.
• [6] Krodkiewski J.M. and Ding J. (1993): Theory and experiment on a method for on-site identification of configurations of multi-bearing rotor systems. - Journal of Sound and Vibration, vol.164, pp.281-293.