Use the Harmonic Perturbation subnode to specify the harmonic part of nonzero prescribed displacements or rotations. This node is used if the study step is frequency response of a perturbation type.

The settings are the same as in the parent Prescribed Displacement/Rotation, Prescribed Velocity, or Prescribed Displacement/Rotation node. Only degrees of freedom selected as prescribed in the parent node can be assigned a value.

 Beam>Prescribed Displacement/Rotation>Harmonic Perturbation
 Beam>Prescribed Velocity>Harmonic Perturbation
 Beam>Prescribed Acceleration>Harmonic Perturbation

Physics tab with Prescribed Displacement/Rotation, Prescribed Velocity, or Prescribed Acceleration node selected in the model tree:
Attributes>Harmonic Perturbation