Directional Loads and Restraints
Prescribed displacements
Directional input refers by default to the global coordinate system
which is based on Plane1 with its origin located at the Origin of the
part or assembly. Plane1 is the first plane that appears in the tree and
may have a different name. You can use other reference planes or axes
to specify directions.
Using Reference Planes
A reference plane defines a Cartesian coordinate system as illustrated
in the figure.

Using Reference Axes
A reference axis defines a cylindrical coordinate system as illustrated
in the figure. Reference axes are useful and necessary for specifying
radial and tangential restraints.
