On the Behavior of Grooved Plate Thrust Bearings With Compressible Lubricant

1968 ◽  
Vol 90 (1) ◽  
pp. 226-232 ◽  
Author(s):  
M. Wildmann
Keyword(s):  
Groove Width ◽  
Thrust Bearings ◽  
Usual Assumption ◽  
Compressible Lubricant

The equations for pressure and load for a grooved plate bearing are derived by assuming that the grooves are sinusoidal rather than square. The usual assumption of zero groove width is thus removed. The effects of groove width and lubricant compressibility are examined independently. Finally, limiting solutions for high compressibility numbers are obtained.

Dynamic Characteristics of Externally Pressurized Rectangular Porous Gas Thrust Bearings

1976 ◽  
Vol 98 (1) ◽  
pp. 181-186 ◽  
Author(s):  
B. C. Majumdar
Keyword(s):  
Design Procedure ◽  
Theoretical Data ◽  
Periodic Load ◽  
Small Perturbations ◽  
Thrust Bearings ◽  
Design Variables ◽  
Wide Range ◽  
Stiffness And Damping ◽  
Compressible Lubricant

A theoretical study on the behavior of an externally pressurized rectangular porous thrust bearing is made using compressible lubricant. A periodic load is imposed on the bearing and the pressure distribution which leads to the determination of stiffness and damping is obtained by small perturbations. The results are calculated numerically using a digital computer. The tabulated theoretical data of a square pad given for a wide range of design variables enable one to use directly in the design. A design procedure of such a bearing is also indicated.

Tribological performance of dimpled thrust bearings with phyllotactic patterns

Wear ◽  
2016 ◽  
Vol 346-347 ◽  
pp. 108-115 ◽  
Author(s):  
Lu Yushan ◽  
Liu Yueming ◽  
Wang Jun ◽  
Liu Hongpeng
Keyword(s):  
Tribological Performance ◽  
Thrust Bearings

scholarly journals Research and Prediction of Wettability of Irregular Square Column Structure on Polymethyl Methacrylate (PMMA) Surface Prepared by Femtosecond Laser

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 529
Author(s):  
Bangfu Wang ◽  
Juan Song
Keyword(s):  
Contact Angle ◽  
Femtosecond Laser ◽  
Prediction Model ◽  
Polymethyl Methacrylate ◽  
Groove Width ◽  
Complete Wetting ◽  
Column Structure ◽  
Pmma Surface ◽  
Incomplete Wetting ◽  
Wetting Model

Based on the contact angle prediction model of a traditional square column structure, the prediction models for wettability of a parallelogram square column structure (PSCS) on polymethyl methacrylate (PMMA) surface prepared by femtosecond laser were established. An experiment was conducted to analyze the rationality of the established complete wetting model and incomplete wetting model. It was found that the incomplete wetting prediction model of the square column structure was more in line with the actual situation. For PSCS, the length of both the long and short sides of the boss and the width of the groove exerted an impact on the contact angle prediction results. Under the condition that the length of the long and short sides of the boss remained unchanged and the groove width increased, the contact angle increased under complete wetting and incomplete wetting. In contrast, under the condition that the long side length of the boss and the groove width remained unchanged and the short side length of the boss increased, the contact angle increased under complete wetting but decreased under incomplete wetting. The maximum contact angle reached 135.65°, indicating that PSCS on PMMA surface enhanced the surface hydrophobicity of the material.

Influence of new surface micro-structures on the performance behaviours of fluid film tilting pad thrust bearings

2021 ◽  
pp. 095440622110309
Author(s):  
JC Atwal ◽  
RK Pandey
Keyword(s):  
Mass Conservation ◽  
Performance Parameters ◽  
Algebraic Equations ◽  
The Finite Element Method ◽  
Thrust Bearings ◽  
Lubrication Equation ◽  
Tilting Pad ◽  
Minimum Film Thickness ◽  
Newton Raphson ◽  
Micro Structures

Performance parameters such as power loss, minimum film thickness, and maximum oil temperature of the sector-shaped tilting pad thrust bearings employing the new micro-structural geometries on pad surfaces have been investigated. The lubrication equation incorporating the mass-conservation issue is discretized using the finite element method and the solution of resulting algebraic equations is obtained employing a Newton-Schur method. The pad equilibrium in the analysis is established using the Newton-Raphson and Braydon methods. The influence of attributes of micro-structures such as depth, circumferential and radial positioning extents have been explored on the performance behaviours. It is found that with the new micro-structured pad surfaces, the performance parameters significantly improved in comparison to conventional plain and conventional rectangular pocketed pads.

Interlaboratory comparison: Round robin test for the damage reproduction of white etching crack in cylindrical roller thrust bearings

Wear ◽  
2021 ◽  
Vol 480-481 ◽  
pp. 203925
Author(s):  
Martin Linzmayer ◽  
Christopher Sous ◽  
Francisco Gutiérrez Guzmán ◽  
Georg Jacobs
Keyword(s):  
Interlaboratory Comparison ◽  
Round Robin ◽  
Round Robin Test ◽  
Thrust Bearings ◽  
Cylindrical Roller
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