Prints the orbital motion characteristics of a rotating structure



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

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).