Numerical Analysis of Hydrodynamic Journal Bearing Lubrication using Computational Fluid Dynamics and Fluid Structure Interaction Approach

2017 ◽  
Vol 8 (4) ◽  
Author(s):  
D.Y. Dhande ◽  
D.W. Pande
Keyword(s):  
Response Surface ◽  
Carrying Capacity ◽  
Computation Time ◽  
Computational Time ◽  
Maximum Pressure ◽  
Load Carrying Capacity ◽  
Lubricating Film ◽  
Response Surface Optimization ◽  
Load Carrying ◽  
Interaction Approach

Now-a-days, journal bearings are subjected to severe loads and higher operating speeds causing generation of high hydrodynamic pressures which in turn deform the bearing shell thus modifying the lubricating film in the operating region. Hence, there is need for optimized bearing performance parameter estimation considering the realistic change in lubricating film along with less computational time. In this paper, response surface optimization module coupled with static structural and fluent, available in ANSYS workbench is used for analysing the performance of the bearing. The optimization is based on Response Surface evaluations. It has been observed that the computation time is considerably reduced. The bearing is analysed for various rotational speeds and eccentricity ratios to obtain load carrying capacity and pressure distribution. It is observed that the results are following the expected trend i.e. as speed increases the load carrying capacity as well as maximum pressure is increasing.

Analysis of misaligned water-lubricated polymer bearing with axial grooves

2019 ◽  
Vol 71 (3) ◽  
pp. 411-419 ◽  
Author(s):  
Fangrui Lv ◽  
Chunxiao Jiao ◽  
Donglin Zou ◽  
Na Ta ◽  
Zhu-shi Rao
Keyword(s):  
Carrying Capacity ◽  
Hydrodynamic Pressure ◽  
Maximum Pressure ◽  
Load Carrying Capacity ◽  
Misalignment Angle ◽  
Content Type ◽  
Load Carrying ◽  
Polymer Bearing ◽  
Journal Misalignment ◽  
Practical Implications

Purpose The purpose of this paper is to analyze the lubrication behavior of misaligned water-lubricated polymer bearings with axial grooves. Design/methodology/approach A lubrication model considering journal misalignment, bush deformation and grooves is established. In dynamic analyses of shaft systems, bearings are usually simplified as supporting points. Thus, an approach for solving the equivalent supporting point location is presented. The influence of misalignment angle and groove number on film thickness, hydrodynamic pressure distribution, load-carrying capacity and ESP location is investigated. Findings As the misalignment angle increases, the location of the maximum pressure and ESP are shifted toward the down-warping end, and the load-carrying capacity of the bearing decreases. In comparison to the nine-groove bearing, the six grooves bearing has a higher load-carrying capacity and the ESP is located closer to the down-warping end for an equivalent misalignment angle. Practical implications The results of this study can be applied to marine propeller shaft systems and other systems with misaligned bearings. Originality/value A study on the lubrication behavior of misaligned water-lubricated polymer bearings with axial grooves is of significant interest to the research community.

The Performance of Hydrodynamic Lubricating Films With Viscosity Variations Perpendicular to the Direction of Motion

1972 ◽  
Vol 94 (1) ◽  
pp. 44-48 ◽  
Author(s):  
E. B. Qvale ◽  
F. R. Wiltshire
Keyword(s):  
Film Thickness ◽  
Carrying Capacity ◽  
Load Carrying Capacity ◽  
End Effects ◽  
Parametric Curves ◽  
One Dimensional ◽  
Lubricating Film ◽  
Families Of Curves ◽  
Load Carrying ◽  
The Coefficient Of Friction

The effects of prescribed viscosity variations across a hydrodynamic lubricating film are studied. The film is strictly one dimensional and end effects are neglected. The viscosity variations are given by three families of curves. The considerable decreases (in the limit 100 percent) and occasional increases in the coefficient of friction that can occur for constant film thickness and load-carrying capacity are evaluated and the results are presented in terms of parametric curves. Important physical situations where these viscosity variations may be observed or produced are described.

scholarly journals A superlinear iteration method for calculation of finite length journal bearing's static equilibrium position

2017 ◽  
Vol 4 (5) ◽  
pp. 161059 ◽  
Author(s):  
Wenjie Zhou ◽  
Xuesong Wei ◽  
Leqin Wang ◽  
Guangkuan Wu
Keyword(s):  
Finite Length ◽  
Carrying Capacity ◽  
Equilibrium Position ◽  
Journal Bearing ◽  
Secant Method ◽  
Static Equilibrium ◽  
Computational Time ◽  
Load Carrying Capacity ◽  
Dynamic Coefficients ◽  
Load Carrying

Solving the static equilibrium position is one of the most important parts of dynamic coefficients calculation and further coupled calculation of rotor system. The main contribution of this study is testing the superlinear iteration convergence method—twofold secant method, for the determination of the static equilibrium position of journal bearing with finite length. Essentially, the Reynolds equation for stable motion is solved by the finite difference method and the inner pressure is obtained by the successive over-relaxation iterative method reinforced by the compound Simpson quadrature formula. The accuracy and efficiency of the twofold secant method are higher in comparison with the secant method and dichotomy. The total number of iterative steps required for the twofold secant method are about one-third of the secant method and less than one-eighth of dichotomy for the same equilibrium position. The calculations for equilibrium position and pressure distribution for different bearing length, clearance and rotating speed were done. In the results, the eccentricity presents linear inverse proportional relationship to the attitude angle. The influence of the bearing length, clearance and bearing radius on the load-carrying capacity was also investigated. The results illustrate that larger bearing length, larger radius and smaller clearance are good for the load-carrying capacity of journal bearing. The application of the twofold secant method can greatly reduce the computational time for calculation of the dynamic coefficients and dynamic characteristics of rotor-bearing system with a journal bearing of finite length.

Elastic Deformation Effects on the Thermo-Hydrodynamic Aspect of Porous Journal Bearings

2014 ◽  
Vol 353 ◽  
pp. 275-279
Author(s):  
S. Boubendir ◽  
Salah Larbi ◽  
R. Bennacer
Keyword(s):  
Elastic Deformation ◽  
Carrying Capacity ◽  
Reynolds Equation ◽  
Maximum Pressure ◽  
Load Carrying Capacity ◽  
Static Characteristics ◽  
Governing Equations ◽  
Load Carrying ◽  
Variation Parameter ◽  
Viscosity Variation

In this paper, the effects of porous bush elastic deformation on the static characteristics of finite porous journal bearing are investigated using Darcy’s law. The modified Reynolds equation applied to thermo-hydrodynamic problems is modified by considering the viscosity variation along the film thickness. The film pressure distribution and other characteristics such as the load carrying capacity and attitude angle are obtained by solving the governing equations numerically. Obtained results showed that deformation is considerable in the maximum pressure zone, and the elastic deformation will decrease the load carrying capacity. The viscosity variation parameter tends also to decrease the load carrying capacity.

Load-Carrying Capacity of the Lubricating Film in the Gap Between Surfaces Textured by Hemispherical Pores

2021 ◽  
Vol 9 (2) ◽  
pp. 1-23
Author(s):  
Leonid Burstein
Keyword(s):  
Carrying Capacity ◽  
Reynolds Equation ◽  
Pore Diameter ◽  
Pore Radius ◽  
Load Carrying Capacity ◽  
Mechanical Parts ◽  
Lubricating Film ◽  
Small Pore ◽  
Cell Dimensions ◽  
Load Carrying

The load support of a lubricating film that separates the surfaces textured by identical equidistant spaced hemispherical pores was investigated. Two-dimensional time-dependent Reynolds equation is solved numerically for different pore-radius-to-gap and cell-dimension-to-pore-radius ratios and for different relative pore positions of opposite surfaces. The results are compared with the data obtained for the case when only one of the opposite surfaces is covered with pores. The obtained data show a maximum in the carrying capacity of the lubricating film when the cell-to-pore-radii ratio is approximately equal to two, in the case of two opposite surfaces with pores. At small pore radii and with increasing cell dimensions, the load support of two surfaces with pores is much greater than in the case of one surface with pores. This behavior reverses with increasing pore diameter. The presented analysis and the provided MATLAB programs are applicable for mechanisms having rubbing mechanical parts with surfaces covered with pores.

Some Characteristics of a Full Journal Bearing Lubricated With Electroconducting Gases

1969 ◽  
Vol 91 (1) ◽  
pp. 199-202
Author(s):  
M. V. Korovchinski
Keyword(s):  
Electric Field ◽  
Pressure Distribution ◽  
Electric Fields ◽  
Carrying Capacity ◽  
Journal Bearing ◽  
Load Carrying Capacity ◽  
Ionized Gas ◽  
Lubricating Film ◽  
Neutral Gas ◽  
Load Carrying

The behavior of an infinitely long journal bearing using an ionized gas lubricant in which a magnetic field is applied axially and an electric field is applied transversely to the fluid film is investigated theoretically. It is found that in the absence of an applied electric field the behavior of the bearing with the ionized gas is not much different from that of a bearing using a neutral gas even at large Hartmann numbers. However, by application of the crossed magnetic and electric fields the pressure distribution in the lubricating film can be altered significantly. Various curves showing the effect of the Hartmann, Hughes, and Harrison numbers on the pressure distribution, film load-carrying capacity, and the locus of the journal center in the bearing are presented and discussed.

Tribological Properties of the Surface Bonded Self-Lubricating Coating

2010 ◽  
Vol 154-155 ◽  
pp. 583-587 ◽  
Author(s):  
Yan Guo Yin ◽  
Fu Dong Lin ◽  
Wei Yao ◽  
Ting Xie ◽  
Jian Wei Yu
Keyword(s):  
Carrying Capacity ◽  
Dry Friction ◽  
Tribological Performance ◽  
Transfer Film ◽  
Metallic Surface ◽  
Load Carrying Capacity ◽  
Sliding Speed ◽  
Lubricating Film ◽  
Load Carrying ◽  
Wear Tests

In order to investigate the effect of load and sliding speed on the tribological performance of epoxy bonded self-lubricating coatings on the metallic surface, a series of wear tests of the coatings containing MoS2 and graphite under dry friction conditions were carried out with different loads and speeds. The results showed that the appropriate load and speed are favorable to the formation of the solid lubricating film on the coating surface and the transfer film on the counterface, which make the coatings have better self-lubricating performance and the friction counterparts run steadily. The load carrying capacity of the surface adhesive self-lubricating coatings decreases as the sliding speed increases.

Sensitivity Analysis of Profiled Steel Sheet in Profiled Steel Sheet Dry Board System (PSSDB)

2013 ◽  
Vol 838-841 ◽  
pp. 444-447 ◽  
Author(s):  
Maryam Vafa ◽  
Wan Hamidon Wan Badaruzzaman ◽  
Siti Aminah Osman
Keyword(s):  
Carrying Capacity ◽  
Steel Sheet ◽  
Ultimate Load ◽  
Computational Time ◽  
Flexural Stiffness ◽  
Load Carrying Capacity ◽  
Cross Sectional ◽  
Load Carrying ◽  
Ultimate Load Carrying Capacity ◽  
Board System

This study examines the effect of different variables of Profiled Steel Sheet (PSS) on various aspects of Profiled Steel Sheet Dry Board (PSSDB) system. PSS is an important component of PSSDB. The sensitivity of PSS variables at the 70% to 140% of Peva45 dimensions, the profiled steel sheet at local markets, to the cross-sectional area of PSS, the ultimate load carrying capacity, and the flexural stiffness of the PSSDB system is analysed. Results are shown in charts, and the most effective variables are determined. The dominant variables are found by saving computational time in the optimization of PSS in the PSSDB system.

Measurement of Load-Carrying Capacity of Thin Lubricating Films

2012 ◽  
Vol 134 (4) ◽  
Author(s):  
Xia Li ◽  
Feng Guo ◽  
Shuyan Yang ◽  
P. L. Wong
Keyword(s):  
Film Thickness ◽  
Carrying Capacity ◽  
Constant Load ◽  
Experimental Results ◽  
Hydrodynamic Theory ◽  
Load Carrying Capacity ◽  
Slider Bearing ◽  
Lubricating Film ◽  
Single Function ◽  
Load Carrying

This paper presents an experimental procedure to evaluate the load-carrying capacity of a fixed-incline slider bearing (dimensionless load W versus convergence ratio K) using a slider-on-disk lubricating film test rig. In general, the applied load is the dependent variable and is directly measured for different convergence ratios such that the relation of the load-carrying capacity W and the convergence ratio K can be obtained. The load and slider inclination are fixed in the present approach, and the film thickness is measured at different speeds. As the dimensionless load can be a function of speed and film thickness, the variation of load-carrying capacity with respect to speed can be obtained even under a constant load and a fixed incline. It is shown that the measured load-carrying capacity is lower than that predicted by the classical hydrodynamic theory. Nevertheless, the experimental results acquire the same trend in the variation of dimensionless loads with convergence ratios. The theory holds that the load-carrying capacity is a single function of the convergence ratio. However, the experimental results show that the dimensionless load-carrying capacity is affected by the inclination angle of the slider, load, and the properties of lubricating oils.

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