Use the Harmonic Perturbation subnode to specify the harmonic part of nonzero prescribed displacements, rotations, velocities, or accelerations. This node is used if the study step contains frequency response of a perturbation type.
Physics tab with Prescribed Displacement,
Prescribed Velocity,
Prescribed Acceleration,
Prescribed Displacement/Rotation, or
Rigid Connector node selected in the model tree:
Attributes>Harmonic Perturbation