Hydrodynamic journal bearing
Diameter shaft D
10
-3
m
Bearing length L
10
-3
m
Diametric clearance ΔD
10
-6
m
Rotational speed n
rpm
Minimum film thickness h
0
10
-6
m
Viscosity η
Pa·s
Density ρ
10
3
kg/m
3
Specific heat capacity c
10
3
J/(kg·K)
Bearing length number L
/D
Clearance number D/ΔD
Eccentricity ratio ε = (ΔR-h
0
)/ΔR
Sommerfeld number So
Attitude angle β
Flow number C
q
Friction number
μ(R/
ΔR)
Coefficient of friction
μ
Load capacity F
10
3
N
Stiffness S = - dF/dh
10
6
N/m
Power loss
W
Side leakage Q
10
-6
m
3
/s
Frictional heating dT
K
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