A compupational approach to stability analysis of synchronous vibration of rotors supported by journal bearings taking into account turbulent flow in the oil film

• Autorzy: Zapomel J.
• Konferencja: Modelowanie w mechanice/Sympozjum (XLIV; 2005; Gliwice; Polska)
• Języki publikacji: EN

Abstrakty

EN

The described method represents a computational approach to stability analysis of steady-state vibration of rotors supported by fluid film bearings produced by imbalance of the rotating parts. Pressure distribution in the bearing gap is determined by means of a Reynolds equation derived in the form that makes possible to take into account not only laminar but also transient and turbulent flow in the oil layer. Modification of the correction coefficients calculated according to Constantinescu gives results that from the physical point of view correspond better to the character of flow in the laminar and transition areas. A trigonometric collocation method, a perturbation technique, and a Floquet theory have been applied for determination of the steady-state response of the rotor system and for judgement of its stability.

Słowa kluczowe

EN

synchronous vibration; rotors supported

• Wydawca: Wydawnictwo Katedry Mechaniki Stosowanej
• Czasopismo: Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska
• Rocznik: 2005
• Tom: z. 29
• Strony: 523--526
• Opis fizyczny: Bibliogr. 9 poz.

Twórcy

autor

Zapomel J.

• Department of mechanics VSB Technical University of Ostrava

Bibliografia

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• [2] Hirs G. G.: A bulk-flow theory for turbulence in lubricant films, ASME Journal of Lubrication Technology, April 1973, pp.137-146.
• [3] Childs D.: Turbomachinery Rotordynamics. Phenomena, Modeling, and Analysis, John Wiley & Sons Ltd., New York, 1993.
• [4] Kramar E.: Dynamics of rotors and foundations, Springer-Verlag, 1993.
• [5] Lahmar М., Haddad A., Nicolas D.: An optimised short bearing theory for nonlinear dynamic analysis of turbulent journal bearings, Eur. J. Mech.A/Solids 19, 2000, pp.151- 177.
• [6] Zeidan F. Y., Vance J. М.: Cavitation regimes in squeeze film dampers and their effect on the pressure distribution, STLE Tribology Transactions, vol.33, no.3, 1990, pp.447- 453.
• [7] Zapomel J., Malenovsky E.: Approaches to numerical investigation of the character and stability of forced and and self-excited vibration of flexible rotors with non-linear supports, IMechE Conference Transactions, 7th International Conference on Vibration in Rotating Machinery, University of Nottingham, 12-14 September 2000, pp.691-699.
• [8] Zapomćl J.: Posuzovani stability rotorovych soustav s hydrodynamickymi lożisky periodicky buzenych, Proceedings of the seminar VypoCty 2000, IT ASCR, VAMET Ltd, Prague, 16 Novemver, 2000, pp. 111-121.
• [9]Zhao J. Y., Linnet I. W., McLean L. J.: Stability and bifurcation of unbalanced response of a squeeze film damped flexible rotor, ASME, Journal of Tribology, vol. 116, pp.361- 368