Abstract
Many researchers have adopted various techniques for improving the performance characteristics of journal bearing. Apart from other parameters, incorporation of different forms of surface texture (sinusoidal, dimple, spherical etc.) on bearing or shaft also helps to increase the load carrying capacity and reduce the friction coefficient etc. in the journal bearing. Present study investigates the influence of different forms of surface texture on finite journal bearing which has been considered in the form of negative texture (micro cavities) at different locations of bearing surface. The Governing equations are solved numerically through finite difference approach for analysis of texture effects on bearing characteristics. It has been observed that the presence of micro cavities at different locations of bearing surface help in enhancing the bearing performance. It has also been found that the negative half wave texture enhances the bearing performance more in comparison to full wave texture on bearing surface.
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Abbreviations
- c :
-
Radial clearance (µm)
- d :
-
Depth of cavity (m or µm)
- d b :
-
Bearing diameter (m)
- d j :
-
Journal diameter (m)
- e :
-
Relative eccentricity of the journal
- F :
-
Friction force (N)
- F T :
-
Texture friction force (N)
- f :
-
Friction coefficient
- f T :
-
Texture friction coefficient
- h :
-
Nominal film thickness (m)
- H :
-
Texture film thickness=h+δ f &h+δ h (m)
- I :
-
Number of nodes in X-direction
- J :
-
Number of node in Y-direction
- K :
-
Number of iterations
- l :
-
Length of bearing (m)
- N :
-
Shaft speed (rpm)
- O b :
-
Bearing center
- O j :
-
Journal or the shaft center
- P :
-
Textured bearing pressure (MPa)
- P s :
-
Bearing pressure (MPa)
- r :
-
Radius of shaft (m)
- U :
-
Shaft speed (m/sec)
- u :
-
Lubricant velocity in x-direction (m/sec)
- w :
-
Width of cavity (m)
- W :
-
Load carrying capacity (N)
- W T :
-
Texture load carrying capacity
- h min :
-
Minimum film thickness=[c∗(1−ε)] (m)
- HI, HII, HIII :
-
Half wave texture for Configuration I, II, III
- FI, FII, FIII :
-
Full wave texture for Configuration I, II, III
- τ :
-
Shear stress (Pa)
- θ :
-
Angular direction (degree)
- Δθ :
-
Cavity span
- ε :
-
Eccentricity ratio
- η :
-
Lubricant viscosity (Pa⋅s)
- δ f &δ h :
-
Surface texture variation for full and half wave respectively (m)
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Kango, S., Singh, D. & Sharma, R.K. Numerical investigation on the influence of surface texture on the performance of hydrodynamic journal bearing. Meccanica 47, 469–482 (2012). https://doi.org/10.1007/s11012-011-9460-y
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DOI: https://doi.org/10.1007/s11012-011-9460-y