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ESE Mechanical 2013 Official Paper - 2

Option 4 : Eccentricity and radial clearance

__Concept:__

In case of a hydrodynamic bearing, let

D = journal or shaft diameter; D1 = Diameter of bearing; h0 = minimum oil film thickness; e = eccentricity

Diametral clearance C = D1 - D

Radial clearance C1 = \(\frac {D_1 - D}{2}\) = R1 - R

R1 = R + e + h0

e = R1 - R - h0

e = C - h0

Attitude of Journal bearing also known as Eccentricity ratio

E = \(\frac {eccentricity}{radial\space clearance}\) = \(\frac {C_1 - h_0}{C_1}\) = 1 - \(\frac {h_0}{C_1}\)

So attitude of journal bearing is **ratio of eccentricity to the radial clearance.**