In the Floating Ring Bearing node you specify the journal and foundation motion, ring properties and lubricant properties necessary to model a floating ring bearing.

Select Ring type — Full floating or Semi floating. In the Full floating case, the ring is allowed to axially rotate under the viscous drag force from the lubricant film in addition to the in plane translation and tilting rotation. In the Semi floating case, axial rotation of the ring is not allowed. The ring is, however, still free to move in-plane and to tilt about the lateral axes. Select Ring position and orientation — Automatic or User defined. In the Automatic case, enter the value of Mass, mring and Moment of inertia, Iring of the ring. The motion of the ring is then computed by momentum and angular momentum balance. In the User defined case, enter the values of the displacement ur,y and ur,z, as well as tilting rotation θr,y and θr,z. In Full floating case, also select Ring speed — Automatic or User defined. If Automatic is selected, enter the value of Polar moment of inertia, Ip,ring (only if Ring position and orientation is User defined). In the User defined case, enter the value of Ring to journal speed ratio, νr.

Select one of the Moving or Flexible foundation options. In these cases, one of the subnodes Moving Foundation or Flexible Foundation is automatically added.

Select Specify — Displacement, Eccentricity and direction, or Load. Then, go to the relevant section below to continue defining the properties.

Select Journal displacement — User defined and enter the displacement values, uj.

Enter values for the Eccentricity, e, and the Attitude angle relative to local y direction, ϕy.

Select Journal Load — User defined and enter the load values, Wj.

Enter the values for the Mass of the journal, mj. Also enter the value for the Initial journal displacement, uj0. Both are generally needed for a time-dependent study. In a stationary study, Initial journal displacement is taken as an initial guess for the journal displacement.

Select Velocity of the journal — Angular speed, Revolutions per time, or Velocity field.

This section is only available when Fluid type is Liquid (Reynolds equation) in the Physical Model section.

Select the Film type — Sommerfeld or Gümbel. In the Sommerfeld case, a complete 2π film is considered in the net force calculation in the bearing. In the Gümbel case, only half of the film where the pressure is positive (π film) is used for computing the net force in the bearing.

The default Dynamic viscosity, μ, is taken From material. For User defined, enter a different value or expression.

With the default options, the Density ρ is taken From material. For User defined enter a different value or expression.

If Gas (modified Reynolds equation) is being solved, the density is determined automatically by the ideal gas law.

If Liquid with cavitation is solved, the density depends on the pressure as ρ = ρc exp(βpf), where pf is the fluid pressure, ρc is the density at the cavitation pressure, and β is the fluid compressibility. In this case, enter the values for the Density at cavitation pressure, ρc, and the Compressibility β.