Results 221 to 230 of about 132,836 (258)

Porous Wall Gas Lubricated Journal Bearings: Theoretical Investigation

Journal of Lubrication Technology, 1979
A model has been developed to compute the dynamic stiffness and damping properties of externally pressurized, porous-wall, gas journal bearings which includes the effects of journal rotation and eccentricity. This paper presents the derivation of the governing equations and the perturbation analysis used to find the unsteady characteristics.
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The Lubrication of a Long, Porous, Flexible Journal Bearing

Journal of Lubrication Technology, 1977
Solutions are obtained for the pressure distributions in porous, flexible long bearings. The oil is assumed to have a viscosity which is either (a) constant or (b) varying with pressure according to the law η = η0eαp. Finally, a method is given whereby the pressure distributions in porous, flexible bearings can be found approximately from the ...
W. C. Mak, H. D. Conway
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Lubrication of a Two-Layer Porous Journal Bearing

Journal of Mechanical Engineering Science, 1972
An analytical solution for the performance characteristics of a two-layer porous bearing, using the short-bearing approximation, is obtained. Results are presented which relate the eccentricity ratio and coefficient of friction as functions of load number for design variables of 0·0001, 0·001, 0·01, and 0·1 and for a ratio of the permeability of the ...
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Design of aerostatic journal bearings with partially porous walls

International Journal of Machine Tool Design and Research, 1978
Abstract Steady-state characteristics of aerostatic journal bearings fed through rows of porous inserts are investigated. The use of a simplified mathematical model allows to derive relationships for the load-capacity, the stiffness, the gas flow rate and the power consumption of the bearing, as functions of the supply pressure, the relative ...
M. Szwarcman, R. Gorez
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Optimum porous journal bearing ensuring maximum load capacity

Fluid Dynamics, 2006
The problem of an infinite journal bearing having an isothermal compressible lubricant and a porous bush and ensuring the optimum load capacity is solved. The optimum clearance profiles and bush dimensions and position are found for various properties of the bush and lubricant supply conditions.
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One-dimensional porous journal bearings lubricated with micropolar fluid

Wear, 1980
Abstract One-dimensional journal bearings lubricated with a micropolar fluid were analysed. It was found that the load capacity increased and the coefficient of friction decreased as the micropolar parameter characterizing the concentration of substructures in the lubricant due to the presence of additives increased.
M. Isa, K.H. Zaheeruddin
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NUMERICAL ANALYSIS OF FINITE POROUS JOURNAL BEARING

Proceeding of 8th Thermal and Fluids Engineering Conference (TFEC), 2023
Elizabeth J. Clifford, Christopher C. Daniels   +1 more
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A study on accuracy of porous journal air bearing

Precision Engineering, 2020
Abstract In order to predict error motion of continuous porous journal air bearing, an accuracy model is established to reveal the relationship among error motion, roundness error and structure parameter under quasi-static conditions. Based on the model, averaging coefficient is defined to quantitatively characterize the error averaging ability.
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Analysis of Porous Layered Journal Bearing Lubricated with Ferrofluid

Applied Mechanics and Materials, 2016
This paper presents an analysis of porous layered long journal bearing lubricated with ferrofluid using displaced infinitely long wire magnetic field model. The ferrofluid flow in the porous region is analyzed using modified Brinkman model.
T.V.V.L.N. Rao, A.M.A. Rani, T. Nagarajan, F.M. Hashim   +3 more
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Stability of Gas-Lubricated, Externally Pressurized Porous Journal Bearings

Journal of Lubrication Technology, 1975
A linear theory of hybrid instability, due to a combination of both whirl and pneumatic hammer, in gas-lubricated porous journal bearings is presented. An approximate solution to the stability problem is obtained by the use of a Galerkin expansion. Results are presented in terms of the variation of stability parameters, such as the threshold mass, the ...
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