Performance of Different Microtexture Shapes for Textured Gas Lubricated Parallel Slider Bearings

2012 ◽  
Author(s):  
Mingfeng Qiu ◽  
Bart Raeymaekers
Keyword(s):  
Carrying Capacity ◽  
Tribological Performance ◽  
Load Carrying Capacity ◽  
Slider Bearings ◽  
Ellipsoidal Shape ◽  
Load Carrying ◽  
Different Shapes

The tribological performance of different microtexture shapes is evaluated for the case of gas lubricated textured parallel slider bearings. The geometry of each shape is optimized in terms of load carrying capacity, after which the performance of different shapes is compared relative to each other. The ellipsoidal shape is found to generate the largest load carrying capacity.

scholarly journals Two-scale homogenization of hydrodynamic lubrication in a mechanical seal with isotropic roughness based on the Elrod cavitation algorithm

2021 ◽  
pp. 135065012110176
Author(s):  
Yanxiang Han ◽  
Qingen Meng ◽  
Gregory de Boer
Keyword(s):  
Surface Topography ◽  
Carrying Capacity ◽  
Hydrodynamic Lubrication ◽  
Tribological Performance ◽  
Stribeck Curve ◽  
Polar Coordinate System ◽  
Load Carrying Capacity ◽  
Mechanical Seal ◽  
Macro Scale ◽  
Load Carrying

A two-scale homogenization method for modelling the hydrodynamic lubrication of mechanical seals with isotropic roughness was developed and presented the influence of surface topography coupled into the lubricating domain. A linearization approach was derived to link the effects of surface topography across disparate scales. Solutions were calculated in a polar coordinate system derived based on the Elrod cavitation algorithm and were determined using homogenization of periodic simulations describing the lubrication of a series of surface topographical features. Solutions obtained for the hydrodynamic lubrication regime showed that the two-scale homogenization approach agreed well with lubrication theory in the case without topography. Varying topography amplitude demonstrated that the presence of surface topography improved tribological performance for a mechanical seal in terms of increasing load-carrying capacity and reducing friction coefficient in the radial direction. A Stribeck curve analysis was conducted, which indicated that including surface topography led to an increase in load-carrying capacity and a reduction in friction. A study of macro-scale surface waviness showed that the micro-scale variations observed were smaller in magnitude but cannot be obtained without the two-scale method and cause significant changes in the tribological performance.

Hydrodynamic Lubrication of Finite Slider Bearings: Effect of One Dimensional Film Shape, and Their Computer Aided Optimum Designs

1983 ◽  
Vol 105 (1) ◽  
pp. 48-63 ◽  
Author(s):  
C. Bagci ◽  
A. P. Singh
Keyword(s):  
Numerical Solution ◽  
Carrying Capacity ◽  
Reynolds Equation ◽  
Hydrodynamic Lubrication ◽  
Load Carrying Capacity ◽  
Slider Bearing ◽  
Design Data ◽  
Slider Bearings ◽  
Load Carrying ◽  
Computer Aided

The effect of the film shape on the load carrying capacity of a hydrodynamically lubricated bearing has not been considered an important factor in the past. Flat-faced tapered bearing and the Raileigh’s step bearing of constant film thickness have been the primary forms of film shapes for slider bearing studies and design data developments. This article, by the computer aided numerical solution of the Reynolds equation for two dimensional incompressible lubricant flow, investigates hydrodynamically lubricated slider bearings having different film shapes and studies the effect of the film shape on the performance characteristics of finite bearings; and it shows that optimized bearing with film shapes having descending slope toward the trailing edge of the bearing has considerably higher load carrying capacity than the optimized flat-faced tapered bearing of the same properties. For example the truncated cycloidal film shape yields 26.3 percent higher load carrying capacity for Lz/Lx = 1 size ratio, and 44 percent higher for Lz/Lx = 1/2. The article then presents charts for the optimum designs of finite slider bearings having tapered, exponential, catenoidal, polynomial, and truncated-cycloidal film shapes, and illustrates their use in numerical bearing design examples. These charts also furnish information on flow rate, side leakage, temperature rise, coefficient of friction, and friction power loss in optimum bearings. Appended to the article are analytical solutions for infinitely wide bearings with optimum bearing characteristics. The computer aided numerical solution of the Reynolds equation in most general form is presented by which finite or infinitely wide hydrodynamically or hydrostatically lubricated bearings, externally pressurized or not, can be studied. A digital computer program is made available.

scholarly journals Non-Newtonian Effects of Second-Order Fluids on the Hydrodynamic Lubrication of Inclined Slider Bearings

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Siddangouda Apparao ◽  
Trimbak Vaijanath Biradar ◽  
Neminath Bhujappa Naduvinamani
Keyword(s):  
Frictional Force ◽  
Carrying Capacity ◽  
Second Order ◽  
Load Carrying Capacity ◽  
Film Pressure ◽  
Pressure Load ◽  
Slider Bearings ◽  
Highly Nonlinear ◽  
Load Carrying ◽  
Second Order Fluids

Theoretical study of non-Newtonian effects of second-order fluids on the performance characteristics of inclined slider bearings is presented. An approximate method is used for the solution of the highly nonlinear momentum equations for the second-order fluids. The closed form expressions for the fluid film pressure, load carrying capacity, frictional force, coefficient of friction, and centre of pressure are obtained. The non-Newtonian second order fluid model increases the film pressure, load carrying capacity, and frictional force whereas the center of pressure slightly shifts towards exit region. Further, the frictional coefficient decreases with an increase in the bearing velocity as expected for an ideal fluid.

On the study of Rayleigh step slider bearings lubricated with non-Newtonian Rabinowitsch fluid

2017 ◽  
Vol 69 (5) ◽  
pp. 666-672
Author(s):  
N.B. Naduvinamani ◽  
Siddharam Patil ◽  
S.S. Siddapur
Keyword(s):  
Carrying Capacity ◽  
Reynolds Equation ◽  
Maximum Load ◽  
Load Carrying Capacity ◽  
Slider Bearing ◽  
Content Type ◽  
Slider Bearings ◽  
Load Carrying ◽  
Modified Reynolds Equation ◽  
Frictional Coefficients

Purpose Nowadays, the use of Newtonian fluid as a lubricant is diminishing day by day, and the use of non-Newtonian fluids has gained importance. This paper presents an analysis of the static characteristics of Rayleigh step slider bearing lubricated with non-Newtonian Rabinowitsch fluid, which has not been studied so far. The purpose of this paper is to derive the modified Reynolds equation for Rabinowitsch fluids for two regions and to obtain the optimum bearing parameters for the Rayleigh step slider bearings. Design/methodology/approach The governing equations relevant to the problem under consideration are derived. The modified Reynolds equation is derived, and it is found to be highly non-linear and hence small perturbation method is adopted to find solution. Findings From this study it is found that there is an increase in the load-carrying capacity, pressure and frictional coefficients for dilatant fluids as compared to the corresponding Newtonian case. Further, for dilatant lubricants the maximum load-carrying capacity is attained for the slightly larger values of entry region length of Rayleigh step bearing as compared to Newtonian and pseudoplastic lubricants. Originality/value Rabinowitsch fluid is used for the study of lubrication characteristics of Rayleigh step bearings. The author believes that the paper presents these results for the first time.

The Pivoted, Spherical Cap Slider Bearing

1982 ◽  
Vol 104 (2) ◽  
pp. 216-219
Author(s):  
J. W. Lund
Keyword(s):  
Carrying Capacity ◽  
Load Carrying Capacity ◽  
Slider Bearing ◽  
Piston Motion ◽  
Spherical Cap ◽  
Slider Bearings ◽  
Positive Displacement ◽  
Load Carrying

In hydraulic pumps of the positive displacement type, the shoes which guide the piston motion may be designed as pivoted slider bearings. One such design, where the bearing geometry is that of a spherical cap, is analyzed and results are presented for the load carrying capacity and the friction.

An Analysis of Powder Lubricated Slider Bearings

1996 ◽  
Vol 118 (1) ◽  
pp. 206-214 ◽  
Author(s):  
K. T. McKeague ◽  
M. M. Khonsari
Keyword(s):  
Boundary Conditions ◽  
Carrying Capacity ◽  
Parametric Study ◽  
Experimental Measurements ◽  
Load Carrying Capacity ◽  
General Boundary Conditions ◽  
Slider Bearing ◽  
Slider Bearings ◽  
Load Carrying ◽  
Theoretical Predictions

A theory for predicting the behavior of powder lubricated slider bearings based on the collisional characteristics of the grain particles and their interactions at the boundaries is presented. General boundary conditions that account for the effects of powder slippage are applied to the slider bearing configuration. Theoretical predictions are presented with comparison to published experimental measurements. An extensive parametric study is also conducted to illustrate the behavior of the flow and the response of the bearing’s load-carrying capacity and friction factor to changes in various powder material and boundary parameters.

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.

Numerical and experimental investigation on influence of compound dimple on tribological performances for rough parallel surfaces

2017 ◽  
Vol 69 (4) ◽  
pp. 433-446 ◽  
Author(s):  
Fanming Meng ◽  
Zhitao Cheng ◽  
Tiangang Zou
Keyword(s):  
Friction Coefficient ◽  
Carrying Capacity ◽  
Tribological Performance ◽  
Textured Surface ◽  
Load Carrying Capacity ◽  
Friction Test ◽  
Content Type ◽  
Load Carrying ◽  
Parallel Surfaces ◽  
Simple Dimple

Purpose This study aims to explore the superiority of the compound dimple (e.g. the rectangular-rectangular dimple) and compare its tribological performance for rough parallel surfaces with those of the traditional one-layer dimple (simple dimple). Design/methodology/approach A mixed-lubrication model for a rough textured surface is established and solved using the finite difference method for film pressure and contact pressure. To accelerate the evaluation of surface deformation, the efficient Continuous convolution fast Fourier transform algorithm is applied. The effects of the compound dimple on the tribological performance for the rough parallel surfaces is numerically investigated. And these effects are compared with those of the simple dimple. Furthermore, a reciprocating friction test is conducted to verify the superiority of the compound dimple. Findings The compound dimple exhibits better tribological performances in comparison with the traditional simple dimple, that is, a larger load-carrying capacity and a smaller friction coefficient. To achieve the best tribological performances for the rough parallel surfaces, the depth ratio of the lower pore to the total pore of the compound dimple and the dimple interval should be reasonably chosen. For the surface with compound dimples, there exists an optimal surface roughness to simultaneously maximize the load-carrying capacity and minimize the friction coefficient. The smaller friction coefficient of the surface with compound dimples is verified by the reciprocating friction test. Originality/value The compound dimple is proposed and the superiority of this novel surface texture is confirmed. This study is expected to provide a new texturing method to improve the tribological performances of the traditional simple dimple.

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