TourTourHydrostatic collar bearing orifice compensated
 Diameter 2R0 (outer diameter bearing)   10-3 m
 Diameter 2R1 (center of groove)   10-3 m
 Diameter 2R2 (inner diameter collar bearing)   10-3 m
 Groove width δ   10-3 m
remark 2) Groove depth h2   10-3 m
 Film thickness h0   10-6 m
 Supply pressure pS   106 Pa
remark 1) Ambient pressure pA   106 Pa
 Pressure factor β  
 Viscosity η   PaĚs
 Density ρ   kg/m3
 Number of orifices  
 Coefficient of discharge CD  
 Dimensionless Flow rate Q'  
 Flow ratio M1/M2  
 Dimensionless Load capacity F'  
 Dimensionless Stiffness S'  
 Load capacity F   N
 Stiffness S=-dF/dh   106 N/m
 Flow rate Q   10-3 l/hr
 Diameter orifices d   10-3 m
 Pump power   10-3 W

1) Calculator with prescribed pressure at the inner and outer diameter >>

2) The pressure distribution over the groove length is assumed to be homogenous which is a good approximation for a continuous groove of large depth. Two options to ad self aligning capability to the collar bearing are possible by applying:

  • shallow grooves
  • partitioned groove with each groove partition connected to one orifice.

Calculation of 1) the effect of the pressure drop in shallow grooves and 2) the exact pressure distribution in a bearing with a partitioned groove as well as 3) the calculation of the self aligning capability of the bearing requires finite element analysis.