Closure to “Discussion of ‘Theoretical Investigation of Externally Pressurized Gas-Lubricated Porous Journal Bearing With Surface-Loading Effect’” (1973, ASME J. Lubr. Technol., 95, pp. 202–203)

1973 ◽  
Vol 95 (2) ◽  
pp. 203-203
Author(s):  
H. Mori ◽  
H. Yabe
Keyword(s):  
Theoretical Investigation ◽  
Journal Bearing ◽  
Surface Loading ◽  
Loading Effect

Theoretical Investigation of Externally Pressurized Gas-Lubricated Porous Journal Bearing With Surface-Loading Effect

1973 ◽  
Vol 95 (2) ◽  
pp. 195-202 ◽  
Author(s):  
H. Mori ◽  
H. Yabe
Keyword(s):  
Porous Media ◽  
Thin Layer ◽  
Gas Flow ◽  
Flow Model ◽  
Journal Bearing ◽  
Theoretical Calculations ◽  
Surface Loading ◽  
Loading Effect ◽  
Gas Bearing ◽  
Theoretical Results

Externally pressurized porous journal gas bearing is analyzed theoretically in this paper by introducing a flow model, in which the flow in the porous bushing is substituted by a flow in an assumed thin layer. The surface loading effect due to machining is taken into account as the increase of resistance to the gas flow from porous media to bearing clearance. The theoretical results are investigated experimentally, yielding a comparatively good conformity between them enough to certify the analysis. Then, the optimum design conditions of the externally pressurized porous journal gas bearing are obtained by theoretical calculations with considering the surface-loading effect.

Stability of Jeffcott Rotor Operating in Tilting 3-Pad Journal Bearings with Turbulent Oil Film

2009 ◽  
Vol 147-149 ◽  
pp. 450-455
Author(s):  
Stanislaw Strzelecki ◽  
Sobhy M. Ghoneam
Keyword(s):  
Theoretical Investigation ◽  
Dynamic Characteristics ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Oil Film ◽  
Temperature Distributions ◽  
Jeffcott Rotor ◽  
Oil Flow ◽  
The Stability ◽  
Oil Film Pressure

This paper introduces the results of theoretical investigation on the dynamic characteristics of tilting 3-pad journal bearing that operates with turbulent oil film. The Reynolds, energy, viscosity and geometry equations determine the oil film pressure, temperature distributions, and oil film resultant force that are the grounds for the dynamic characteristics of bearing. These equations were solved simultaneously on the assumption of adiabatic laminar or adiabatic turbulent oil flow in the bearing gap. The stability and system damping of Jeffcott rotor operating in tilting 3-pad journal bearing was determined.

Thermoelastic influences in journal bearing lubrication

1986 ◽  
Vol 403 (1824) ◽  
pp. 111-134 ◽  
Keyword(s):  
Film Thickness ◽  
Theoretical Investigation ◽  
Journal Bearing ◽  
Load Capacity ◽  
Journal Bearings ◽  
Thermal Distortion ◽  
Two Dimensional ◽  
Thickness Increase ◽  
Minimum Film Thickness ◽  
The Stability

A theoretical investigation is made to study the way in which thermal distortion of bearing components modifies the characteristics of journal bearings. The thermoelastic treatment developed is two-dimensional and incorporates an existing thermohydrodynamic analysis. It is applied to circular and partial arc bearings for a range of parametric groups governing the bearing operation. The results show that for a fixed journal position, the effect of thermal distortion is to reduce the minimum film thickness, increase the load capacity, increase the peak temperatures and pressures, and also to enhance considerably the stability of the bearing. The effects are more marked for larger oil-lubricated bearings and higher speeds of operation and it is suggested that discrepancies observed between experimental results and existing theory could be largely explained by this phenomenon.

Theoretical investigation of surface texture effects on the performance characteristics of hydrodynamic two-lobe journal bearing

2020 ◽  
Vol 234 (11) ◽  
pp. 1712-1725
Author(s):  
Niranjan Singh ◽  
RK Awasthi
Keyword(s):  
Finite Element Method ◽  
Theoretical Investigation ◽  
Reynolds Equation ◽  
Journal Bearing ◽  
Surface Texturing ◽  
Performance Characteristics ◽  
Performance Parameters ◽  
Eccentricity Ratio ◽  
Static Performance ◽  
Bearing System

In the present work, theoretical investigation has been performed to predict the influence of spherical textures on the performance characteristics of two-lobe journal bearing system. The flow of lubricant in the clearance space between the bearing and the journal is governed by the Reynolds equation assuming the flow is Newtonian and isoviscous. The Reynolds equation is solved using a finite element method and the static performance parameters of circular/two-lobe smooth/textured journal bearing system have been computed with variation in eccentricity ratio, dimple depth and its location. The numerically simulated results reveal that the partial surface texturing can provide better performance when the textures are created in the pressure build-up region of 126°–286° and the dimple aspect ratio is nearly 1.0.

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