Spiral groove journal bearings
Calculator for self acting air bearings
1)
Bearing length L/D
Shaft diameter D
10
-3
m
Radial clearance dR
10
-6
m
Rotations per minute n
10
3
rpm
Lubricant viscosity η
10
-6
Pa�s
Compressibility number
Λ=
(6
η
ω(R/dR)^2)/pA
Dimensionless stiffness S1=S
�
pA
�
R^2/(ω
�
dR)
Bearing stiffness S
10
-6
N/m
Attitude angle β
deg
1)
Calculation based on groove geometry α=33�, γ=1 and
δ
=1.
www.engineering-abc.com