Optimization of circular hydrostatic axial journal bearings using a multicriteria approach

2003 ◽  
Vol 217 (3) ◽  
pp. 235-241 ◽  
Author(s):  
E Solmaz ◽  
F C Babalik ◽  
F Öztürk
Keyword(s):  
Design Process ◽  
Temperature Rise ◽  
Multicriteria Optimization ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Design Parameters ◽  
Optimization Approach ◽  
Power Requirement ◽  
Research Outcomes ◽  
Bearing Design

The solutions that best optimize the design process must be determined using single-criterion and multicriteria approaches. In this research, a multicriteria optimization approach is carried out to determine the circular hydrostatic journal bearing design parameters based on the power requirement, the bearing coefficient and the minimization of the temperature rise of the oil, so that the total performance of the system is optimal. The optimization results of more than two criteria are presented and compared with previous research outcomes. Computational experimental results are given to demonstrate the effectiveness of the present approach.

Externally-Pressurized Gas-Lubricated Floating-Ring Porous Journal Bearings: Part 1: Steady State Analysis

1984 ◽  
Vol 198 (4) ◽  
pp. 213-224 ◽  
Author(s):  
M Malik
Keyword(s):  
Steady State ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Design Parameters ◽  
Fixed Bearing ◽  
Steady State Analysis ◽  
Permeability Parameter ◽  
New Type ◽  
Bearing Design ◽  
Steady State Performance

A new type of gas-lubricated floating-ring journal bearing in which the fixed bearing and the ring are both porous, has been conceived and analysed, theoretically, for the steady state characteristics. Bearing characteristics are presented against two design parameters, namely, clearances ratio and permeability parameter. The comparison of these characteristics with those of externally-pressurized plain porous journal bearings shows that the new bearing represents, with its steady state performance, a distinctly advanced bearing design.

Investigation of sustainability of lubricated journal bearing under relevant design parameters

2018 ◽  
Vol 70 (4) ◽  
pp. 789-804 ◽  
Author(s):  
M.M. Shahin ◽  
Mohammad Asaduzzaman Chowdhury ◽  
Md. Arefin Kowser ◽  
Uttam Kumar Debnath ◽  
M.H. Monir
Keyword(s):  
Aspect Ratio ◽  
Elastic Strain ◽  
Journal Bearing ◽  
Design Parameters ◽  
Content Type ◽  
Computational Fluid Dynamics Cfd ◽  
Stress Formation ◽  
Bearing Design ◽  
The Stability ◽  
Bearing Friction

Purpose The purposes of the present study are to ensure higher sustainability of journal bearings under different applied loads and to observe bearing performances such as elastic strain, total deformation and stress formation. Design/methodology/approach A journal bearing test rig was used to determine the effect of the applied load on the bearing friction, film thickness, lubricant film pressure, etc. A steady-state analysis was performed to obtain the bearing performance. Findings An efficient aspect ratio (L/D) range was obtained to increase the durability or the stability of the bearing while the bearing is in the working condition by using SAE 5W-30 oil. The results from the study were compared with previous studies in which different types of oil and water, such as Newtonian fluid (NF), magnetorheological fluid (MRF) and nonmagnetorheological fluid (NMRF), were used as the lubricant. To ensure a preferable aspect ratio range (0.25-0.50), a computational fluid dynamics (CFD) analysis was conducted by ANSYS; the results show a lower elastic strain and deformation within the preferable aspect ratio (0.25-0.50) rather than a higher aspect ratio using the SAE 5W-30 oil. Originality/value It is expected that the findings of this study will contribute to the improvement of the bearing design and the bearing lubricating system.

Effect of Journal Misalignment on the Oil Film Pressure and Temperature Distribution of 3-Lobe Offset Journal Bearing

2005 ◽  
Author(s):  
S. Strzelecki ◽  
Z. Towarek
Keyword(s):  
Temperature Distribution ◽  
High Speed ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Good Stability ◽  
Rotating Machines ◽  
Film Pressure ◽  
Bearing Design ◽  
Journal Misalignment ◽  
Oil Film Pressure

The design of turbines and compressors operating at the high rotational speeds applies the 3-lobe journal bearings. In many cases the classic 3-lobe journal bearings supporting the rotors, are showing the problem of rotor stability. This problem can be avoided by the application of 3-lobe Offset bearings. This type of bearing fulfils the conditions of reliable bearing design and good stability in the case of high speed rotating machines.

Theoretical Analysis of Externally Pressurized Air Journal Bearing

1970 ◽  
Vol 12 (2) ◽  
pp. 123-129 ◽  
Author(s):  
B. C. Majumdar
Keyword(s):  
Experimental Data ◽  
Carrying Capacity ◽  
Reynolds Equation ◽  
Journal Bearing ◽  
Design Parameters ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Dimensional Parameters ◽  
Bearing Design

A theoretical investigation is made to predict the performance of an externally pressurized air journal bearing having several pressure sources. The pressure distribution, which leads to the determination of load-carrying capacity and flow requirement, is obtained by solving Reynolds equation numerically. The load and flow, expressed in non-dimensional parameters, are presented for different bearing design parameters (dimensionless). The results predicted by this method are compared with others' experimental data.

Integration of an Automatic Optimizer Functionality Into the Design Process of Industrial Steam Turbines

2012 ◽  
Author(s):  
Dimitri Drapkin ◽  
Franz Kores ◽  
Thomas Polklas
Keyword(s):  
Design Process ◽  
Optimization Methods ◽  
Simultaneous Optimization ◽  
Design Parameters ◽  
Optimization Approach ◽  
Steam Turbines ◽  
Particle Swarm Optimizer ◽  
Optimization Task ◽  
Wide Range ◽  
Optimization Parameters

Industrial steam turbines are mostly tailor made machinery, varying in a wide range of specifications. This feature introduces high requirements on the design process which has to be flexible, efficient and fast at the same time. Given live steam and design parameters as input, the geometry corresponding to the valid design scheme can be calculated together with the required thermodynamic, aerodynamic and mechanical characteristics. By variation of design parameters a design may be achieved which optimizes both, efficiency and cost. The optimization task is formulated mathematically, e.g. crucial optimization parameters, criteria for evaluation of different designs and other required constraints are selected. The structure of the resulting optimization problem is analyzed. Based on this analysis a modular optimization system design is proposed. The choice of Genetic Algorithms and Adaptive Particle Swarm Optimizer as optimization methods is discussed, recommendations for their proper use are given. A bicriterial optimization approach for a simultaneous optimization of efficiency and cost is developed.

Theoretical Evaluation of Capacitance, Capacitive Reactance, Resistance and Their Effects on Performance of Hydrodynamic Journal Bearings

1991 ◽  
Vol 113 (4) ◽  
pp. 762-767 ◽  
Author(s):  
H. Prashad
Keyword(s):  
Journal Bearings ◽  
Design Parameters ◽  
Clearance Ratio ◽  
Theoretical Evaluation ◽  
Active Resistance ◽  
Variable Resistor ◽  
Load Carrying ◽  
Capacitive Reactance ◽  
Bearing Design ◽  
Safe Load

A theoretical approach is developed to determine capacitance, capacitive reactance, active resistance, and impedance of hydrodynamic journal bearings under different conditions of operation. It has been established that the bearing capacitance increases with eccentricity and L/D ratios but reduces with increase in clearance ratio. On the contrary, resistance and capacitive reactance of a bearing increase with the clearance ratio but reduce with increase in the eccentricity and L/D ratios. However, the bearing impedance is more affected by the resistance than the capacitive reactance. The bearing behaves like a capacitor till the ratio of capacitive reactance to active resistance is less than unity, and acts like a variable resistor as this ratio exceeds unity. This analysis has a potential to analysis safe load carrying capacity at different speeds of operation by determining the bearing capacitance. Also, this may act as a guide to select the bearing design parameters for safe and reliable operation of a hydrodynamic journal bearing.

Relation between Theory, Experiment, and Practice in Journal Bearing Design

1935 ◽  
Vol 129 (1) ◽  
pp. 435-475
Author(s):  
H. L. Haslegrave
Keyword(s):  
Journal Bearing ◽  
Preceding Paper ◽  
Theoretical Method ◽  
Journal Bearings ◽  
Point Of View ◽  
Theoretical Research ◽  
Basic Principles ◽  
Electrical Analogy ◽  
Resultant Effect ◽  
Bearing Design

The first section of the paper is devoted to the correlation of experimental and theoretical research on journal bearings embracing the angles of 360 deg., 180 deg., and 120 deg., and attempts to combine hitherto isolated experimental data by making use of the results of Kingsbury's experiments based upon an electrical analogy. The possible causes of divergence in the results obtained by different workers are enumerated and their effect on the general agreement explained. There is considerable experimental evidence to support the basic principles of the method of design derived in the preceding paper by Dr. Swift. The second section analyses current methods of design in the light of these principles, and explains the reasons for departure from the theoretical method in some cases. Particulars relating to journal bearings used in various types of machines are tabulated, and values of the dimensionless criteria used in actual practice are compared with those suggested by theory. Design examples are worked out, and results tabulated, in order to explain the methods which may be employed in order to secure optimum running conditions in various circumstances, and their resultant effect on performance. A summary is given in the last section of the existing state of knowledge relating to journal bearings, considered from the point of view of the designer. Further data still necessary are enumerated and the avenues of research yet to be explored in order to obtain this knowledge are explained.

Analysis of Externally Pressurized Gas Journal Bearing

1970 ◽  
Vol 12 (1) ◽  
pp. 1-8 ◽  
Author(s):  
B. C. Majumdar
Keyword(s):  
Numerical Method ◽  
Approximate Method ◽  
Journal Bearing ◽  
Design Parameters ◽  
Method Of Solution ◽  
Bearing Design ◽  
Numerical Method Of Solution ◽  
Gas Journal Bearing

An externally pressurized gas journal bearing with multiple supply holes is analysed theoretically by numerical method of solution. The load and flow are predicted by considering both axial and circumferential flow. These load and flow expressed in dimensionless factors are presented for different bearing design parameters. The results are compared with the similar available approximate method.

Thermohydrostatic rheological analysis of constant flow valve compensated multiple hole-entry hybrid journal bearings

2014 ◽  
Vol 66 (2) ◽  
pp. 244-259 ◽  
Author(s):  
H.C. Garg ◽  
Vijay Kumar
Keyword(s):  
Temperature Rise ◽  
High Speed ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Constant Flow ◽  
Design Data ◽  
Content Type ◽  
Viscosity Variation ◽  
Flow Valve ◽  
Newtonian Behavior

Purpose – The changing technological scenario necessitated hybrid journal bearings to operate under severe conditions of heavy load and high speed resulting into temperature rise of the lubricant fluid-film and bearing surface. To predict the performance of a bearing realistically, theoretical model must consider the combined influence of the rise of temperature and non-Newtonian behavior of the lubricant. The aim of the present paper is to study the effect of viscosity variation due to temperature rise and non-Newtonian behavior of the lubricant on performance of constant flow valve compensated multiple hole-entry hybrid journal bearings. Design/methodology/approach – Finite element method has been used to solve Reynolds equation along with restrictor flow equation, 3D energy equation and 3D conduction equation using suitable iterative technique. The non-Newtonian lubricant has been assumed to follow cubic shear stress law. Findings – The thermohydrostatic rheological performances of symmetric and asymmetric hole-entry hybrid journal bearing configurations are studied. The computed results illustrate that variation of viscosity due to rise in temperature and non-Newtonian behavior of the lubricant affects the performance of hole-entry hybrid journal bearing system quite significantly. Originality/value – In the present work, the influences of the viscosity variation due to temperature rise and non-Newtonian behavior of the lubricant on the performance characteristics of non-recessed hole-entry hybrid journal bearing with symmetric and asymmetric configurations compensated with constant flow valve restrictors have been investigated for generating the design data to be used by bearing designer. The design data computed in the present thesis are a contribution in field of knowledge of bearing design.

Analysis of Eccentric Load Effect for Tiliting Pad Journal Bearing

2013 ◽  
Vol 364 ◽  
pp. 71-75
Author(s):  
Ming Hu Yin ◽  
Guo Ding Chen ◽  
Guo Yuan Zhang
Keyword(s):  
Dynamic Characteristics ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Eccentric Load ◽  
Load Effect ◽  
Static And Dynamic Characteristics ◽  
Tilting Pad ◽  
Bearing Design ◽  
Tilting Pad Journal Bearing ◽  
Tilting Pad Journal Bearings

Most of the studies about tilting pad journal bearings are for load-on-pad or load-between-pad tilting pad journal bearings, and for the other loading forms, the performance are often estimated by the performance of the two limited conditions, that may reduce the reliablity of bearing design or lead to waste materials in design. To obtained the influence of the load directions on the static and dynamic characteristics of the tilting pad journal bearing, which is called eccentric load effect in this papers, the performance calculation of the tilting pad journal bearing in different load directions is operated with a self-designed program. The results show that the load directions have considerable effects both on the static and dynamic characteristics of the tilting pad journal bearing, for the operating condition that load direction changed rapidly, it need performance analysis of the bearing in its special loading forms to enhance the precision and efficiency of bearing design, espacially where the dynamic performance of the tilting pad journal bearing is demanding.

Sign in / Sign up

Export Citation Format

Share Document