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Transient thermoelastic effects in fluid film bearings
Wear, 1982Abstract A method is presented for the calculation of temperature in the shoe-film-rotor assembly of a thrust bearing. This method allows reverse flow to occur and simplifies the calculation of hot oil carry-over. An analysis is developed to propagate thermoelastic effects in time following a change in any operating condition such as load or speed ...
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Developments in Fluid Film Bearing Technology
2010This paper presents some new developments in Fluid Film Bearing (FFB) technology. The phenomena of oil whirl and oil whip leading to instability in FFB supported rotors; limit the performance of rotating machinery. This paper presents some new developments that affect the instability threshold, namely the positive effect of angular misalignment on the ...
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On the optimization of fluid film bearings
Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences, 1976In a classical paper slightly after the turn of the century, Lord Rayleigh obtained the optimum one dimensional slider bearing profile, the Rayleigh step. His criteria for optimality was that the load capacity per unit length of the bearing be maximum among all profiles having a given minimum film thickness.
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Fundamentals of Fluid Film Journal Bearing Operation and Modeling
2005Widely used in turbomachinery, the fluid film journal bearing is critical to a machine’s overall reliability level. Their design complexity and application severity continue to increase making it challenging for the plant machinery engineer to evaluate their reliability.
He, Minhui +3 more
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Instability of Rotors in Fluid Film Bearings
Journal of Vibration and Acoustics, 1983This paper is concerned with instability of a rotor that arises due to fluid film forces of a journal bearing. The half frequency whirl and the resulting oil whip phenomena is explained by a consideration of flow balance in a bearing which looses the load carrying capacity.
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Dynamic Coefficients for Fluid Film Journal Bearings
1990An analysis for deriving the stiffness and damping coefficients of a journal bearing is presented. It is based on a Pertubation solution of the lubrication equation (Reynold’s equation) where the resulting partial differential equations are evaluated numerically.
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Transient Response of Externally Pressurized Fluid Film Bearings©
Tribology Transactions, 1997The transient response of a point-mass rotor supported in turbulent flow, externally pressurized fluid film bearings is presented. The equations of motion are solved numerically with local linearization at each integration time step. The bearing reaction forces are calculated from the numerical solution of unsteady bulk-flow equations including fluid ...
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Experiencing rotor and fluid film bearing dynamics
2012Starting from fruitful past experiences on rolling bearing diagnostics, the research activity here presented has aimed since the beginning to investigate the physical phenomena that are at the base of experimental rotor dynamics, when fluid bearings are involved. An appropriate test bench was designed and a prototype assembled. The peculiarities of the
ZANARINI, ALESSANDRO, CAVALLINI, ANDREA
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