Design Charts for Optimum Bearing Configurations: 1—The Full Journal Bearing

1971 ◽  
Vol 93 (2) ◽  
pp. 302-305 ◽  
Author(s):  
H. Moes ◽  
R. Bosma
Keyword(s):  
Journal Bearing ◽  
Hydrodynamic Bearings ◽  
Design Chart ◽  
Design Charts ◽  
Dimensionless Groups

This paper presents a new design chart for the full journal bearing using dimensionless groups containing all relevant parameters the designer is mainly interested in. Some illustrative examples of how to use this chart have been added. The main object, however, is the introduction of a new way of presenting bearing data of all kinds of hydrodynamic bearings in such a way that they are directly suitable for design purposes. Particular attention has been paid to the possibility of optimization procedures which follow logically and directly from this chart. Other types of film bearings shall be treated in later papers.

Design Charts for Optimum Bearing Configurations: 2—The Pivoted-Pad Thrust Bearing

1970 ◽  
Vol 92 (4) ◽  
pp. 572-577 ◽  
Author(s):  
R. Bosma ◽  
H. Moes
Keyword(s):  
Thrust Bearing ◽  
Journal Bearings ◽  
Thrust Bearings ◽  
Design Chart ◽  
Design Charts ◽  
Dimensionless Groups ◽  
Minimum Film Thickness ◽  
New Type ◽  
Complete Set ◽  
Film Stiffness

As a followup to an earlier paper in which a new type of design chart for full journal bearings was given a complete set of design charts for pivoted-pad thrust bearings (Michell bearings) shall now be presented. The dimensionless groups of parameters representing minimum film thickness and bearing traction for one single pad, respectively, have been plotted in a new design chart. Some illustrative examples demonstrating how to use the chart for optimization of pivoted-pad thrust bearings have been included. Some attention has also been paid to the stiffness of the film of lubricant. A design chart for film stiffness has been added to this purpose.

Investigation the combined effects of wear and turbulent on the performance of hydrodynamic journal bearing operating with couple stress fluids

2019 ◽  
Vol 10 (6) ◽  
pp. 825-837
Author(s):  
Mushrek A. Mahdi ◽  
Ahmed Waleed Hussein
Keyword(s):  
Couple Stress ◽  
Reynolds Equation ◽  
Journal Bearing ◽  
Performance Characteristics ◽  
Turbulent Regime ◽  
Hydrodynamic Bearings ◽  
Content Type ◽  
Hydrodynamic Journal Bearing ◽  
Local Reynolds Number ◽  
Couple Stress Fluids

Purpose The purpose of this paper is to investigate the combined effect of wear and turbulence on the performance of a hydrodynamic journal bearing operating under Newtonian and couple stress fluids (CSF). Design/methodology/approach The analysis consists of a modified Reynolds equation of incompressible thin viscous films, and the film thickness model taking into account the wear effect. The governing equation was solved numerically using the finite difference approach. Findings The effect of both the wear parameter and the local Reynolds number on the performance characteristics of bearing has been presented and discussed. The obtained results observed that the characteristics of the intact and worn bearing in turbulent and laminar have been enhanced due to the non-Newtonian fluid (CSF) effect. Also, the results display that bearing worn and the turbulent regime cannot be neglected in calculating the performance characteristics of the bearing lubricated with Newtonian and non-Newtonian fluids. The results achieved from this study, specify that the bearing characteristics are significantly affected by these effects. Originality/value The paper investigates the behavior of hydrodynamic bearings considering different aspects simultaneously is interesting, and the application meets the current needs of improvement in modeling hydrodynamic bearings under different conditions.

Kriging Approach Dedicated to Represent Hydrodynamic Bearings

2020 ◽  
Author(s):  
Jefferson Silva Barbosa ◽  
Leonardo Campanine Sicchieri ◽  
Arinan Dourado ◽  
Aldemir Ap. Cavalini Jr. ◽  
Valder Steffen Jr
Keyword(s):  
Reynolds Equation ◽  
Journal Bearing ◽  
Computational Effort ◽  
Physical Models ◽  
Hydrodynamic Bearings ◽  
Tilting Pad ◽  
Modeling Techniques ◽  
Complex Models ◽  
Tilting Pad Journal Bearing ◽  
Kriging Approach

Abstract The mathematical modeling of journal bearings has advanced significantly since the Reynolds equation was first proposed. Advances in the processing capacity of computers and numerical techniques led to multi-physical models that are able to describe the behavior of hydrodynamic bearings. However, many researchers prefer to apply simple models of these components in rotor-bearing analyses due to the computational effort that complex models require. Surrogate modeling techniques are statistical procedures that can be applied to represent complex models. In the present work, Kriging models are formulated to substitute the thermohydrodynamic (THD) models of three different bearings found in a Francis hydropower unit, namely a cylindrical journal (CJ) bearing, a tilting-pad journal bearing (TPJ) bearing, and a tilting-pad thrust (TPT) bearing. The results determined by using the proposed approach reveal that Kriging models can be satisfactorily used as surrogate THD-models of hydrodynamic bearings.

Investigation of the Hydrodynamic Behavior of New Construction Hydrodynamic Tilting-Pad Journal Bearing

2005 ◽  
Author(s):  
Vladas Vekteris ◽  
Vadim Mokshin
Keyword(s):  
High Stability ◽  
Journal Bearing ◽  
Complex Method ◽  
Hydrodynamic Behavior ◽  
Hydrodynamic Bearings ◽  
Hydrodynamic Bearing ◽  
Tilting Pad ◽  
New Construction ◽  
Tilting Pad Journal Bearing

The paper describes features of new construction pad-type (segmental) hydrodynamic bearing with mobile ring and results of investigations of this bearing. The researchers obtained complex method of interaction between the mobile ring and pads. Except the diagram of distribution of lubricant pressure on the surface of pad there are presented photos of the flowing lubricant in the bearing and graphs of trajectories of the rotor journal’s axis for various number of revolutions of the rotor. Presented results of investigations show high stability of new construction hydrodynamic bearings in case of big number of revolutions of the rotor. Researchers hope that new construction bearings can be successfully used in tribological systems at the mentioned condition.

Partial Journal Bearing Performance in the Laminar Regime

1975 ◽  
Vol 97 (1) ◽  
pp. 94-100 ◽  
Author(s):  
T. S. Yu ◽  
A. Z. Szevi
Keyword(s):  
Heat Conduction ◽  
Radial Direction ◽  
Journal Bearing ◽  
Two Dimensional ◽  
Approximate Analysis ◽  
Laminar Regime ◽  
Design Charts ◽  
Numerical Iteration ◽  
Equation Of Heat Conduction ◽  
Energy Equations

In this approximate analysis of laminar journal bearing operations both the momentum and the energy equations are two dimensional, the shaft operates at a constant temperature and the bearing conducts heat in the radial direction only. Via the last of these assumptions, the equation of heat conduction is eliminated from consideration. The remaining equations are solved by a numerical iteration method. A parametric study of therohydrodynamic journal bearing operations is performed and design charts are given for a 100 deg arc bearing.

A Proposed Design Chart to Predict the Inelastic Buckling Pressures for Conical Shells Under Uniform External Pressure

2007 ◽  
Vol 44 (02) ◽  
pp. 77-81
Author(s):  
Carl T. F. Ross
Keyword(s):  
Factor Of Safety ◽  
Random Distribution ◽  
External Pressure ◽  
External Hydrostatic Pressure ◽  
Circular Section ◽  
Inelastic Buckling ◽  
Conical Shells ◽  
Uniform External Pressure ◽  
Design Chart ◽  
Design Charts

The paper presents the theoretical and experimental results obtained when 15 machined circular section conical shells were tested to destruction under uniform external hydrostatic pressure. Three of the shells buckled elastically, but the other 12 buckled inelastically. Previous research has found that the inelastic buckling of such shells with small initial out-of-circularity has defied exact mathematical analysis, due to the fact that the initial out-of-circularity is very small and also of random distribution about the circumference. In this paper these results are used to provide a design chart that enables the inelastic buckling pressures of these vessels to be successfully determined. This design chart should prove to be more accurate, but less conservative, than existing design charts, so that the factor of ignorance is decreased and more reliability can be placed on the true factor of safety.

Dynamic Stiffness and Damping Coefficients of Aerostatic, Porous, Journal Bearings

1978 ◽  
Vol 20 (5) ◽  
pp. 291-296 ◽  
Author(s):  
N. S. Rao ◽  
B. C. Majumdar
Keyword(s):  
Continuity Equation ◽  
Reynolds Equation ◽  
Journal Bearing ◽  
Dynamic Pressure ◽  
Dynamic Stiffness ◽  
Journal Bearings ◽  
Operating Conditions ◽  
Damping Coefficients ◽  
Design Charts ◽  
Stiffness And Damping

A periodic (displacement) disturbance is imposed on an aerostatic, porous, journal bearing of finite length under steady-state conditions. The dynamic pressure distribution is obtained by a pressure perturbation analysis of Reynolds equation and a modified flow continuity equation in a porous medium. Dynamic stiffness and damping coefficients for different operating conditions are calculated numerically, using a digital computer, and presented in the form of design charts.

Thermohydrodynamic Design Charts for Tilting-Pad Journal Bearings

1996 ◽  
Vol 118 (1) ◽  
pp. 232-238 ◽  
Author(s):  
M. Fillon ◽  
M. Khonsari
Keyword(s):  
Boundary Conditions ◽  
Temperature Rise ◽  
Effective Temperature ◽  
Journal Bearings ◽  
Maximum Temperature ◽  
Experimental Measurements ◽  
Design Chart ◽  
Design Charts ◽  
Tilting Pad ◽  
Tilting Pad Journal Bearings

Design charts are presented which allow one to predict the maximum temperature and a realistic effective temperature of five-shoe tilting-pad bearings. The charts utilize two dimensionless parameters which characterize the temperature rise in the film based on the ISOADI boundary conditions. A number of examples are presented to illustrate the utility of the design chart where the results are compared to both experimental measurements and full THD simulations.

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