Radial Roller Bearing
Add a Radial Roller Bearing node to model a surface on the rotor supported by a roller bearing. The selected boundaries should form a cylindrical surface representing the surface connected with the inner race of the bearing. The forces on the rollers are computed using the Hertz contact theory. The built-in variables for the roller force distribution has the form <physicsName>.<RollerBearingTag>.fb[x,y,z], for example rotsld.rrb1.fbx.
You can also study the effect of misalignment by adding a Misalignment subnode.
Bearing Orientation
Use the settings in this section to define the orientation of the bearing. Subsequent vector and matrix inputs are specified in the local directions specified here.
Enter the Bearing orientation vector defining the local x direction. The direction given will be adjusted so that it is orthogonal to the rotor axis. The default value is the global y-axis.
You can further modify the x-axis orientation by entering an angle for the Rotation of the orientation vector around the bearing axis. The direction inferred from the previous setting will be rotated counterclockwise around the rotor axis.
Geometric Properties
Select a Bearing Type — Deep groove ball bearing, Angular contact ball bearing, Self aligning ball bearing, Spherical roller bearing, Cylindrical roller bearing, or Tapered roller bearing. Then go to the relevant section below to continue defining the properties.
Deep Groove Ball Bearing
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Select either Single row or Double row to specify if the bearing consists of single or double rows of rollers.
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For a Double row bearing, enter the Axial distance between the roller centers.
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Enter the remaining geometric properties Number of balls; Ball diameter; Pitch diameter; Contour radius, inner race; and Contour radius, outer race to define the bearing geometry.
Angular Contact Ball Bearing
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Select either Single row or Double row to specify if the bearing consists of single or double rows of rollers.
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For a Double row bearing, enter the Axial distance between the roller centers.
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Enter the remaining geometric properties Number of balls; Ball diameter; Pitch diameter; Contour radius, inner race; Contour radius, outer race; and Initial contact angle to define the bearing geometry.
Self Aligning Ball Bearing
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Select either Single row or Double row to specify if the bearing consists of single or double rows of rollers.
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Enter the geometric properties Number of balls; Ball diameter; Pitch diameter; Contour radius, inner race; and Contour radius, outer race.
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For a Double row bearing, enter also Initial contact angle.
Spherical Roller Bearing
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Select either Single row or Double row to specify if the bearing consists of single or double rows of rollers.
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For a Double row bearing, enter the Axial distance between the roller centers and Initial contact angle.
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Enter the remaining geometric properties Number of rollers; Roller diameter; Pitch diameter; Contour radius, inner race; and Contour radius, outer race to define the bearing geometry.
Cylindrical Roller Bearing
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Select either of Single row or Double row to specify if the bearing consists of single or double rows of rollers.
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For a Double row bearing, enter the Axial distance between the roller centers.
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Enter the remaining geometric properties Number of rollers, Roller diameter, Effective length of the roller, and Pitch diameter to define the bearing geometry.
Tapered Roller Bearing
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Select either of Single row or Double row to specify if the bearing consists of single or double rows of rollers.
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For Single row bearing, enter the Axial offset of roller center.
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For Double row bearing enter the Axial distance between the roller centers.
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Enter the remaining geometric properties Number of rollers, Roller diameter, Effective length of the roller, Pitch diameter, Cap radius, Semi cone angle, Roller axis orientation, Cap angle, and Flange contact angle to define the bearing geometry.
Clearance and Preload
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Enter a Radial clearance for all bearings except a Tapered roller bearing. For the Tapered roller bearing, enter values for the Inner race clearance, the Outer race clearance, and the Flange clearance.
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Select the Include preload checkbox to specify the preload in the bearings. For the Deep groove ball bearing and Cylindrical roller bearing, specify a Radial preload. For the Angular contact ball Bearing and Tapered roller bearing, specify an Axial preload. For the Self aligning ball bearing and Spherical roller bearing, specify a Radial preload for single row and an Axial preload for the double row bearings.
Material Properties
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Enter the material properties Young’s modulus, inner race and Poisson’s ratio, inner race to define the elastic properties of the inner race in the bearing.
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Select Outer race material — Same as inner race or User defined. If User defined is selected, enter the values of Young’s modulus, outer race and Poisson’s ratio, outer race.
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Finally select Roller material — Same as inner race or User defined. If User defined is selected, enter the values of the Young’s modulus, roller/ball and Poisson’s ratio, roller/ball.
Foundation Properties
Select one of the Fixed, Moving, Flexible, or Squeeze-film damper foundation options. If the model component also contains other structural physics interfaces such as Solid Mechanics, Multibody Dynamics, or Shell that have Attachment or Rigid Domain features, the above list is extended with the attachments and rigid domains available in these physics interfaces. In the Moving, Flexible, and Squeeze-film damper cases, the subnodes Moving Foundation, Flexible Foundation, or Squeeze-Film Damper are automatically added. If any of the attachments or rigid domains is selected, displacement and rotation of the selected feature are used as foundation motion. Attachments and rigid domains provide an easy way of coupling the rotor with the stator.
Location in User Interface
Context Menus
 Solid Rotor > Bearings > Radial Roller Bearing
Solid Rotor, Fixed Frame > Bearings > Radial Roller Bearing
Ribbon
Physics tab with Solid Rotor or Solid Rotor, Fixed Frame selected:
Boundaries > Bearings > Radial Roller Bearing