Reynolds boundary condition realization in journal bearings: location of oil film rupture boundary with layering-sliding mesh method

2021 ◽  
pp. 107330
Author(s):  
Wanjun Xu ◽  
Yongwei Tian ◽  
Kang Li ◽  
Mingjie Zhang ◽  
Jiangang Yang
Keyword(s):  
Boundary Condition ◽  
Journal Bearings ◽  
Film Rupture ◽  
Oil Film ◽  
Sliding Mesh ◽  
Mesh Method

On the Performance of Journal Bearings Under Conditions of Film Rupture, Part I

1975 ◽  
Vol 97 (4) ◽  
pp. 585-590 ◽  
Author(s):  
W. A. Crosby ◽  
E. M. Badawy
Keyword(s):  
Boundary Condition ◽  
Journal Bearings ◽  
Film Rupture ◽  
Separation Line ◽  
Cavity Profile ◽  
Rupture Part ◽  
Different Depths

A model of film rupture taking into account both the finger-pattern and the flow carried away over and/or under the cavity is considered. A tractable boundary condition is derived by assuming that the Reynolds flow is retained in the vicinity of the cavity. The pressure isobars and cavity profile are shown at different depths of the clearance space. Thus, the shape of the separation line is obtained. A modification is suggested so that the boundary condition may accommodate the occurrence of cavitation at higher loads.

On the Performance of Journal Bearings Under Conditions of Film Rupture, Part II

1975 ◽  
Vol 97 (4) ◽  
pp. 591-598
Author(s):  
W. A. Crosby ◽  
E. M. Badawy
Keyword(s):  
Boundary Condition ◽  
Boundary Conditions ◽  
Finite Length ◽  
Infinite Number ◽  
Reynolds Equation ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Operating Characteristics ◽  
Film Rupture ◽  
Rupture Part

An analytical analysis of journal bearing performance under conditions of film rupture by separation and by cavitation is performed. The ruptured region is considered to have an infinite number of cavities. The boundary condition of Reynolds’ equation at the trailing edge is influenced by the bearing’s operating characteristics and the method of oil admission. A variational solution is given in order to extend the applicability of the boundary conditions to bearings of finite length.

scholarly journals Reynolds Boundary Condition Approximation in Journal Bearings Based on Dynamic Mesh Method

2021 ◽  
Vol 16 (2) ◽  
pp. 81-88
Author(s):  
Wanjun Xu ◽  
Yongwei Tian ◽  
Ying Song ◽  
Mingjie Zhang ◽  
Jiangang Yang
Keyword(s):  
Boundary Condition ◽  
Journal Bearings ◽  
Dynamic Mesh ◽  
Mesh Method

The Effect of Journal Bearing Misalignment on Load and Cavitation for Non-Newtonian Lubricants

1986 ◽  
Vol 108 (4) ◽  
pp. 645-654 ◽  
Author(s):  
R. H. Buckholz ◽  
J. F. Lin
Keyword(s):  
Reynolds Equation ◽  
Numerical Solutions ◽  
Journal Bearings ◽  
Surface Boundary ◽  
Film Rupture ◽  
Aspect Ratios ◽  
Free Surface Boundary Condition ◽  
Load Carrying ◽  
Boundary Location ◽  
Surface Boundary Condition

An analysis for hydrodynamic, non-Newtonian lubrication of misaligned journal bearings is given. The hydrodynamic load-carrying capacity for partial arc journal bearings lubricated by power-law, non-Newtonian fluids is calculated for small valves of the bearing aspect ratios. These results are compared with: numerical solutions to the non-Newtonian modified Reynolds equation, with Ocvirk’s experimental results for misaligned bearings, and with other numerical simulations. The cavitation (i.e., film rupture) boundary location is calculated using the Reynolds’ free-surface, boundary condition.

A Theoretical Analysis of Floating Bush Journal Bearing With Axial Oil Film Rupture Being Considered

2002 ◽  
Vol 124 (3) ◽  
pp. 494-505 ◽  
Author(s):  
Kiyoshi Hatakenaka ◽  
Masato Tanaka ◽  
Kenji Suzuki
Keyword(s):  
Steady State ◽  
Reynolds Equation ◽  
Speed Ratio ◽  
Shaft Speed ◽  
Film Rupture ◽  
State Behavior ◽  
Oil Film ◽  
Rotordynamic Coefficients ◽  
The Stability ◽  
Very High

A new modified Reynolds equation is derived with centrifugal force acting on the hydrodynamic oil film being considered. This equation, together with a cavitation model, is used to obtain the steady-state equilibrium and calculate the rotordynamic coefficients of lightly loaded floating bush journal bearings operating at very high shaft speeds. The bush-to-shaft speed ratio and the linear cross-coupling spring coefficients of the inner oil film is found to decrease with the increase in shaft speed as the axial oil film rupture develops in the inner oil film. The present model can give reasonable explanation to the steady-state behavior and the stability behavior of the bearing observed in actual machines.

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