Influence of Magnetic Fluids’ Cohesion Force and Squeeze Dynamic Effect on the Lubrication Performance of Journal Bearing PDF Download
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Category :
Languages : en
Pages :
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Author:
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Category :
Languages : en
Pages :
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Author: Hany S. Abdo
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659529399
Category :
Languages : en
Pages : 132
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Book Description
This book is concerned with theoretical study for the thermal effects of the hydrodynamic journal bearings lubricated by ferrofluids with couple stresses. The study is generalize such that it covered both Newtonian and non-Newtonian behavior of the lubricant. Based on the momentum and continuity equations for ferrofluid under an applied magnetic field, a pressure differential equation (modified Reynolds equation) has been obtained. Assuming linear behavior for the magnetic material of the ferrofluid, and using carrying current concentric finite wire magnetic field model, the magnetic force was calculated. A modified Reynolds equation is obtained and it is simultaneously solved with the energy equation numerically by the finite difference technique. The pressure and temperature distributions have been obtained. The solution renders the bearing performance characteristics namely; load carrying capacity, attitude angle of the journal center, frictional force at the journal surface, friction coefficient and bearing side leakage.
Author:
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Category : Mechanics, Applied
Languages : en
Pages : 410
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Author: John A. Tichy
Publisher:
ISBN:
Category : Damping (Mechanics)
Languages : en
Pages : 44
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In the modeling and analysis of rotor dynamic systems, the behavior of squeeze film damper bearings is normally predicted by the Reynolds equation of hydrodynamic lubrication. Large bearing gaps and high speeds can combine to create conditions in practical applications where fluid inertia and viscoelastic effects may become significant, violating the assumptions under which Reynolds equation can be applied. The analysis shows that the results of lubrication theory can be greatly in error with regard to phase effects between bearing forces and displacements, which may have profound implications regarding critical speed and forced response behavior. Very large deviations from lubrication theory have been predicted in a series of analytical papers under this contract. In the present study direct measurements of damper forces are presented for the first time. Reynolds numbers up to ten are obtained at eccentricity ratios 0.2 and 0.5. Lubrication theory underpredicts the measured forces by up to a factor of two (100% error). Qualitative agreement is found with predictions of the improved theory which includes fluid inertia forces.
Author: Yankun Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 212
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Author: Lloyd Edward Barrett
Publisher:
ISBN:
Category : Fluid-film bearings
Languages : en
Pages : 170
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Author: Buuren, Sietze van
Publisher: KIT Scientific Publishing
ISBN: 3731500841
Category : Technology & Engineering
Languages : en
Pages : 182
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Book Description
A specific cost-efficient type of plain journal bearing is the porous journal bearing, which possesses a pervious bush that serves as a lubricant reservoir. The current work is concerned with modeling porous journal bearings in multibody systems, for which dynamical models are needed to investigate the bearing's behavior. Such porous journal bearing models as well as models of elementary rotor-bearing systems including these, were developed and investigated during the course for this work.
Author: A. N. Al-Makhlafy
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: F. K. Orcutt
Publisher:
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Category : Journal bearings
Languages : en
Pages : 124
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Author: Hazem Ezzat Ahmed Ezzat
Publisher:
ISBN:
Category :
Languages : en
Pages : 632
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