Closure to “Discussion of ‘Optimum Design of Multiple-Hole Inherently Compensated Air Bearings—Part 1: Circular Thrust Bearings’” (1975, ASME J. Lubr. Technol., 97, pp. 655–656)

1975 ◽  
Vol 97 (4) ◽  
pp. 656-656
Author(s):  
S. Eshghy
Keyword(s):  
Optimum Design ◽  
Air Bearings ◽  
Thrust Bearings

Optimum Design of Multiple-Hole Inherently Compensated Air Bearings—Part 1: Circular Thrust Bearings

1975 ◽  
Vol 97 (2) ◽  
pp. 221-227 ◽  
Author(s):  
S. Eshghy
Keyword(s):  
Optimum Design ◽  
Flow Model ◽  
Dynamic Pressure ◽  
Journal Bearings ◽  
Entrance Region ◽  
Experimental Measurements ◽  
Partial Recovery ◽  
Air Bearings ◽  
Normal Stiffness ◽  
Thrust Bearings

Analyses of inherently compensated hydrostatic gas bearings of three types are presented. The flow model incorporates empirically the partial recovery of the dynamic pressure in the entrance region. Conditions leading to maximum normal stiffness or/and load are given for air. Analytical results are compared with experimental measurements. Circular thrust bearings are discussed in this article. Subsequent papers will deal with collar thrust and journal bearings.

An Experimental Investigation on Friction Coefficient in Plain Journal Bearings During Start-Up

2008 ◽  
Author(s):  
J. Bouyer ◽  
M. Fillon
Keyword(s):  
Experimental Investigation ◽  
Friction Coefficient ◽  
Journal Bearings ◽  
Radial Clearance ◽  
Experimental Measurements ◽  
Air Bearings ◽  
Specific Pressure ◽  
Thrust Bearings ◽  
Start Up ◽  
Transient Thermal

The start-up friction coefficient is a parameter which is very useful for engineers who design hydrodynamic bearings. It is most often issued from an approximation. Several studies can be found in the literature on this topic but most of them are concerned with air bearings or are only numerical. Some studies are more general and deal with the transient thermal behaviour in journal bearings as well as in thrust bearings. Other studies deal with the friction coefficient during running, at a fixed rotational speed. The aim of this study is to provide experimental measurements of the bush torque during start-up of plain journal bearings, varying the specific pressure. Thus, the friction coefficient at start-up (deduced from measurements) is obtained for four different bearings varying feeding conditions, radial clearance and length.

scholarly journals THE OPTIMUM DESIGN OF GAS STATIC THRUST BEARINGS WITH STRAIGHT-THROUGH LABYRINTH SEALS

2011 ◽  
Vol 1 (6) ◽  
pp. 18-23
Author(s):  
Alexander V. Kosmynin ◽  
◽  
Olga A. Krasilinikova ◽  
Nadezhda S. Gumenyuk ◽  
◽  
...  
Keyword(s):  
Optimum Design ◽  
Labyrinth Seals ◽  
Thrust Bearings

Optimum Design of Small Size Fluid Film Thrust Bearing Considering the Productivity

2010 ◽  
Author(s):  
Yuta Sunami ◽  
Hiromu Hashimoto
Keyword(s):  
Optimum Design ◽  
Dynamic Stiffness ◽  
High Sensitivity ◽  
Groove Depth ◽  
Fluid Film ◽  
Original Result ◽  
Thrust Bearings ◽  
Fluid Film Bearings ◽  
Machining Errors ◽  
Bearing Stiffness

In the manufacturing process of small size fluid film bearings, the machining errors of groove affect the bearing characteristics. This paper describes the optimum design of small size fluid film thrust bearings to reduce the characteristics variability caused by some productivity. Firstly, from the original result of the modified spiral bearing obtained by the geometrical optimization, critical bearing parameters related to sensitivity of dynamic stiffness was investigated. From the sensitivity analysis, it was clarified that the parameters of groove depth and groove ratio have high sensitivity towards bearing stiffness. In the optimum design with consideration of productivity, errors for groove depth and groove ratio were given using probability theory with restriction towards the dynamic stiffness variability. From the results, the reduction of dynamic stiffness variability was accomplished. Furthermore, even if the manufacturing errors exist, the optimized bearing is operated safely without contact because it is able to stay in the range of the allowable film thickness.

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