Prints the orbital motion characteristics of a rotating structure

Compatible Products: – | – | Premium | Enterprise | Ent PP | Ent Solver | –


When a structure is rotating and the Coriolis or gyroscopic effect is taken into account (CORIOLIS), nodes lying on the rotation axis generally exhibit an elliptical orbital motion. The PRORB command prints out the orbit characteristics A, B, PSI, PHI, YMAX and ZMAX of each rotating node, where

A is the semi-major axis.
B is the semi-minor axis.
PSI is the angle between local y axis and major axis.
PHI is the angle between initial position (t = 0) and major axis.
YMAX is the maximum displacement along local y axis.
ZMAX is the maximum displacement along local z axis.

Angles PSI and PHI are in degrees and within the range of -180 through +180. For more information about orbit definition, see Orbits in the Advanced Analysis Guide.

To display the characteristics of the orbital path traversed by each node, issue the PLORB command.

The PRORB command is valid for line elements (such as BEAM188, BEAM189, PIPE288, and PIPE289).

Your model must also involve a rotational velocity (OMEGA or CMOMEGA) with Coriolis enabled in a stationary reference frame (CORIOLIS,,,,RefFrame = ON).

A SET command should be issued after PRORB to ensure proper output for subsequent postprocessing commands.

The coordinate system for displaying nodal results must be global Cartesian (RSYS,KCN = 0).

Menu Paths

Main Menu>General Postproc>Rotor Dynamics>Plot orbit

Release 18.2 - © ANSYS, Inc. All rights reserved.