The Beam Rotor (rotbm) interface (
), found under the
Structural Mechanics >
Rotordynamics branch (
) when adding a physics interface, is intended for analysis of rotating structural components in 3D modeled using a line geometry. With this interface, you can compute are displacements, velocities, accelerations, and stresses. The
Journal Bearing and
Thrust Bearing features provided in this interface can be used to model different types of bearings. You can also model the effect of a bearing mounted on a foundation.
When the Beam Rotor interface is added, these default nodes are also added to the
Model Builder —
Linear Elastic Material;
Rotor Cross Section (cross-sectional properties of the Rotor domain);
Free (a boundary condition where boundaries are free, with no loads or constraints); and
Initial Values. The
Fixed Axial Rotation (a reference point where the axial rotation relative to the rigid rotation of the rotor is zero), is the default node and is only added when the
No torsion checkbox is not selected in the interface’s
Axial and Torsional Vibration section.
From the Physics toolbar, you can add features that implement other rotor properties. You can also right-click
Beam Rotor to select physics features from the context menu.
The Label is the default physics interface name.
The Name is used primarily as a scope prefix for variables defined by the physics interface. Refer to such physics interface variables in expressions using the pattern
<name>.<variable_name>. In order to distinguish between variables belonging to different physics interfaces, the
name string must be unique. Only letters, numbers, and underscores (_) are permitted in the
Name field. The first character must be a letter.
The default Name (for the first physics interface in the model) is
rotbm.
Enter the Rotor speed as revolutions per time or angular velocity (variable
omegar). This speed, together with the rotor axis, is then used to compute the frame acceleration forces due to rotation of the rotor.
Clear the No torsion checkbox (selected by default) to include the torsional vibration in the rotor. Similarly, clear the
No axial vibration checkbox (selected by default) to also include the axial vibration in the rotor model.
Clear the Include the undeformed geometry in stress/whirl plot (selected by default) to avoid plotting the undeformed geometry in the stress and whirl plots.
