Solving the nonlinear problem of gas-lubricated hybrid circular bearings. Part II: unsteady case

• Autorzy: Nedelcu S. , Postelnicu A.
• Języki publikacji: EN

Abstrakty

EN

In the paper, a dynamic analysis of gas-lubricated hybrid circular bearings is made. The mathematical model is the Reynolds equation in unsteady regimes along with the boundary conditions for a multiple connected domain. Within the hypothesis of a periodic relative motion of bearing surfaces, the method of small perturbations is used. The equations of the model are solved numerically using a difference finite method and finally, the curves of variation of the critical mass versus the eccentricity are obtained.

Słowa kluczowe

EN

lubrication; hybrid bearings; compressible fluids; unsteady regime; nonlinear equations

PL

smarowanie; łożysko hybrydowe; równanie nieliniowe

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2002
• Tom: Vol. 7, no 2
• Strony: 465--478
• Opis fizyczny: Bibliogr. 12 poz., wykr.

Twórcy

autor

Nedelcu S.

• Department of Mathematics, Air Force Academy, Brasov, 2200, ROMANIA

autor

Postelnicu A.

• Department of Fluid Mechanics, Transilvania University of Brasov, 2200, ROMANIA

Bibliografia

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• [2] Ausman J.S. (1965): Linearized stability theory for translatory half-speed whirl of long, self-acting gas-lubricated journal bearings. - Journal of Basic Engineering, Trans. ASME, Series D, vol.85, pp.611-619.
• [3] Castelli V. and Pirvics, J. (1968): Review of numerical methods in gas bearing film analysis. - Journal of Lubrication Technology, Trans. ASME, Series F, vol.90, No.4, pp.777-792.
• [4] Coleman R. and Snider A.D. (1969): Linearization for numerical solution of the Reynolds equation. - Journal of Lubrication Technology, Trans. ASME, Series F, vol.91, No.4, pp.506-507.
• [5] Constantinescu V.N. (1963): Gas Lubrication. - Romanian Academy Publishing House (in Romanian).
• [6] Constantinescu V.N., Nica Al., Pascovici M., Ceptureanu Gh. and Nedelcu S. (1985): Sliding Bearings. - N-Y: Allerton Press, Inc.
• [7] Liu L.Q. and Chen C.Z.(1999): Mathematical model for gas bearing with holes of tangential supply. - ASME Journal of Tribology, vol.121, pp. 301-305.
• [8] Lund J.W. (1965): A theoretical analysis of whirl instability and pneumatic hammer for rigid rotor in pressurized gas bearings. - Journal of Basic Engineering, Trans. ASME, Series D, vol.87, No.l, pp.45-51.
• [9] Lund J.W. (1987): Review of the concept of dynamic coefficients for fluid film journal bearings. - ASME Journal of Tribology, Series F, vol. 109, No.l, pp.37-41.
• [10] Wilcock D.F. (Ed.) (1972): Gas Bearing Design Manual. - Mechanical Technology Inc. (M.T.I.), Lethem, N.Y.
• [11] Nedelcu S. and Postelnicu A. (2000): Solving the nonlinear problem of gas-lubricated hybrid circular bearings. Part I: Steady case. - Applied Mechanics and Engineering, vol.5, No.3, pp.629-653.
• [12] Shapiro W. (1969): Steady-state and dynamic analyses of gas-lubricated hybrid journal bearing. - Journal of Lubrication Technology, Trans. ASME, January, vol.91, No.2, pp.212-217.