scholarly journals Erratum: “Estimating the Severity of Shaft Vibrations Within Fluid Film Journal Bearings” (Journal of Lubrication Technology, 1983, 105, pp. 306–312)

1984 ◽  
Vol 106 (3) ◽  
pp. 374-374
Author(s):  
J. D. McHugh
Keyword(s):  
Journal Bearings ◽  
Fluid Film

An analytical study of the fluid film force in finite-length journal bearings. Part I

2001 ◽  
Vol 13 (4) ◽  
pp. 329-340 ◽  
Author(s):  
V. D'Agostino ◽  
D. Guida ◽  
A. Ruggiero ◽  
A. Senatore
Keyword(s):  
Finite Length ◽  
Analytical Study ◽  
Journal Bearings ◽  
Fluid Film

Theoretical Condition for the Cxy=Cyx Relation in Fluid Film Journal Bearings

1989 ◽  
Vol 111 (3) ◽  
pp. 426-429 ◽  
Author(s):  
T. Kato ◽  
Y. Hori
Keyword(s):  
Reynolds Equation ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Fluid Film ◽  
Finite Width ◽  
Damping Coefficients ◽  
Dynamic Coefficients ◽  
Cross Terms ◽  
Linear Damping ◽  
Theoretical Condition

A computer program for calculating dynamic coefficients of journal bearings is necessary in designing fluid film journal bearings and an accuracy of the program is sometimes checked by the relation that the cross terms of linear damping coefficients of journal bearings are equal to each other, namely “Cxy = Cyx”. However, the condition for this relation has not been clear. This paper shows that the relation “Cxy = Cyx” holds in any type of finite width journal bearing when these are calculated under the following condition: (I) The governing Reynolds equation is linear in pressure or regarded as linear in numerical calculations; (II) Film thickness is given by h = c (1 + κcosθ); and (III) Boundary condition is homogeneous such as p=0 or dp/dn=0, where n denotes a normal to the boundary.

scholarly journals Mixed and Fluid Film Lubrication Characteristics of Worn Journal Bearings

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Toshiharu Kazama ◽  
Yukihito Narita
Keyword(s):  
Frictional Coefficient ◽  
Journal Bearings ◽  
Mixed Lubrication ◽  
Operating Conditions ◽  
Fluid Film ◽  
Asperity Contact ◽  
Lubrication Regimes ◽  
Lubrication Characteristics ◽  
Film Lubrication ◽  
Fluid Film Lubrication

The mixed and fluid film lubrication characteristics of plain journal bearings with shape changed by wear are numerically examined. A mixed lubrication model that employs both of the asperity-contact mechanism proposed by Greenwood and Williamson and the average flow model proposed by Patir and Cheng includes the effects of adsorbed film and elastic deformation is applied. Considering roughness interaction, the effects of the dent depth and operating conditions on the loci of the journal center, the asperity-contact and hydrodynamic fluid pressures, friction, and leakage are discussed. The following conclusions are drawn. In the mixed lubrication regime, the dent of the bearing noticeably influences the contact and fluid pressures. For smaller dents, the contact pressure and frictional coefficient reduce. In mixed and fluid film lubrication regimes, the pressure and coefficient increase for larger dents. Furthermore, as the dent increases and the Sommerfeld number decreases, the flow rate continuously increases.

Static, Dynamic, and Thermal Properties of Compressible Fluid Film Journal Bearings

2011 ◽  
Vol 54 (2) ◽  
pp. 282-299 ◽  
Author(s):  
Bo Terp Paulsen ◽  
Stefano Morosi ◽  
Ilmar F. Santos
Keyword(s):  
Thermal Properties ◽  
Compressible Fluid ◽  
Journal Bearings ◽  
Fluid Film

Lubrication of journal bearings—influence of stress jump condition at the porous-media/fluid film interface

2002 ◽  
Vol 35 (5) ◽  
pp. 287-295 ◽  
Author(s):  
Ming-Da Chen ◽  
Kuo-Ming Chang ◽  
Jau-Wen Lin ◽  
Wang-Long Li
Keyword(s):  
Porous Media ◽  
Jump Condition ◽  
Journal Bearings ◽  
Fluid Film ◽  
Stress Jump ◽  
Film Interface

Performance of Starved Journal Bearings With Oil Ring Lubrication

1985 ◽  
Vol 107 (1) ◽  
pp. 23-31 ◽  
Author(s):  
H. Heshmat ◽  
O. Pinkus
Keyword(s):  
Hydrodynamic Lubrication ◽  
Journal Bearings ◽  
Fluid Film ◽  
Experimental Program ◽  
Power Losses ◽  
Maximum Temperatures

An experimental program documenting the performance of journal bearings for conditions ranging from full hydrodynamic lubrication to states of extreme lubricant starvation is described. The effects of an incomplete fluid film on the eccentricity locus, extent of film, average and maximum temperatures, flow, and power losses are given as a function of amount of lubricant available to the bearing. In particular, the performance of starved bearings with oil ring lubrication is experimentally correlated to enable the designer to predict not only oil delivery by the ring, but also the resultant performance of the bearing.

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