Effect of Surface Waviness on the Performances of an Aerostatic Thrust Bearing with Orifice-Type Restrictor

1950 ◽

Vol 163 (1) ◽

pp. 149-161 ◽

Cited By ~ 41

Author(s):

M. E. Salama

Keyword(s):

Thrust Bearing ◽

Prime Factor ◽

Thrust Bearings ◽

Rational Explanation ◽

Film Lubrication ◽

Effect Of Surface

This work was initiated to investigate the effect of surface macro-roughness on the performance of the parallel-faces thrust bearing and, at the same time, to find a rational explanation of its behaviour. The problem is treated both theoretically and experimentally and the main result arrived at indicates that macro-roughness is a prime factor in the behaviour of the bearing, as it provides passages which both feed the surfaces with the lubricant and allow the formation of hydrodynamic films so that the performance corresponds closer to that for film lubrication. Further work on micro-roughness is proceeding.

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Effect of Transverse and Longitudinal Surface Waviness on the Operation of Journal Bearings

Journal of Mechanical Engineering Science ◽

10.1243/jmes_jour_1972_014_024_02 ◽

1972 ◽

Vol 14 (3) ◽

pp. 168-172 ◽

Cited By ~ 12

Author(s):

P. Shelly ◽

C. Ettles

Keyword(s):

High Speed ◽

Load Capacity ◽

Surface Waviness ◽

Machining Processes ◽

Finishing Process ◽

Oil Flow ◽

Method Of Solution ◽

The Mean ◽

Effect Of Surface ◽

Bearing Friction

An analysis is made to evaluate the effect of surface finish produced by the two final machining processes of high speed aero boring and broaching. A finite difference method of solution is used in which the number of waves superimposed on the basic geometry is successively increased. A strong asymptotic trend was found for all bearing characteristics beyond a relatively small number of waves. It is found that the load capacity compared to a smooth bearing is reduced for both processes if the surface waviness is included as an addition to the film height. If the film thickness is assumed to extend to the mean wave height, the load capacity is increased. The effect of surface waviness becomes more pronounced at higher eccentricities or as the amplitude of the waviness is increased. The variation of bearing friction and oil flow is shown. It is concluded that neither finishing process would have a serious deleterious effect on journal bearing performance.

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Effect of surface waviness on the static performance of aerostatic journal bearings

Tribology International ◽

10.1016/j.triboint.2016.07.026 ◽

2016 ◽

Vol 103 ◽

pp. 394-405 ◽

Cited By ~ 25

Author(s):

Xinkuan Wang ◽

Qiao Xu ◽

Baorui Wang ◽

Lianxin Zhang ◽

Hong Yang ◽

...

Keyword(s):

Journal Bearings ◽

Surface Waviness ◽

Static Performance ◽

Effect Of Surface

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The Effect of Surface Waviness and Number of Rolling Elements on the Dynamic Behavior of a Rotor-Bearing System

Volume 1: 21st Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C ◽

10.1115/detc2007-35389 ◽

2007 ◽

Author(s):

S. P. Harsha ◽

C. Nataraj

Keyword(s):

Chaotic Behavior ◽

Nonlinear Dynamic Analysis ◽

Wave Number ◽

Surface Waviness ◽

Nonlinear Load ◽

Nonlinear Springs ◽

Rotor Bearing ◽

Rolling Elements ◽

Bearing System ◽

Effect Of Surface

In the paper, the effects of the number of rolling elements and wave number of surface waviness on the nonlinear dynamic analysis of a rotor-bearing system has been studied. In the analytical formulation, the contacts between rolling elements and races are considered as nonlinear springs, whose stiffnesses are obtained by using Hertzian elastic contact deformation theory. The results are presented in the form of Fast Fourier Transformations (FFT) and Poincare´ maps, which show that the vibration characteristics of the rotor and its bearings change when the bearings operate in different regions of their nonlinear load deflection characteristics. The appearance of regions of periodic, sub-harmonic and chaotic behavior has been observed to be strongly dependent on number of rolling elements.

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An Interferometric Technique for Measuring Micron Level Clearances Filled With a Lubricant

STLE/ASME 2010 International Joint Tribology Conference ◽

10.1115/ijtc2010-41304 ◽

2010 ◽

Author(s):

Murat Yıldırım ◽

Zafer Dursunkaya ◽

Tuba Okutucu

Keyword(s):

Step Motor ◽

Surface Waviness ◽

Piston Motion ◽

Interferometric Technique ◽

Piston Cylinder ◽

Effect Of Surface

The aim of this study is to develop an interferometric technique to measure micron level clearances occurring in small piston-cylinder arrangements; such as hermetically sealed compressors. A Cartesian model of the piston cylinder arrangement is manufactured and lateral and vertical motions are generated via a step motor, and micrometers, respectively, to simulate the piston motion and the change of clearance during the motion. Experiments are conducted in air and a lubricant. Measurements show the important effect of surface waviness of the mirror and the effect of the motion of the carriage at micron level measurements.

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Development of an Interferometric Technique to be Used in Measuring Micron Level Clearances Filled With a Lubricant

ASME/STLE 2009 International Joint Tribology Conference ◽

10.1115/ijtc2009-15094 ◽

2009 ◽

Author(s):

Murat Yıldırım ◽

Zafer Dursunkaya ◽

Tuba Okutucu

Keyword(s):

Step Motor ◽

Surface Waviness ◽

Piston Motion ◽

Interferometric Technique ◽

Piston Cylinder ◽

Effect Of Surface

The aim of this study is to develop an interferometric technique to measure micron level clearances occurring in small piston-cylinder arrangements; such as hermetically sealed compressors. A Cartesian model of the piston cylinder arrangement is manufactured and lateral and vertical motions are generated via a step motor, and micrometers, respectively, to simulate the piston motion and the change of clearance during the motion. Experiments are conducted in air and a lubricant. Measurements show the important effect of surface waviness of the mirror and the effect of the motion of the carriage at micron level measurements.

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