Applying Acceleration Base Motions

You can apply an acceleration base motion load to specify the motion of nodes in a harmonic response step or a modal dynamic step.

You prescribe the displacements and rotations that are associated with a base during the harmonic response step or modal dynamic step.

See Also
About Base Motions
In Other Guides
Feature Manager
  1. From the Loads section of the action bar, click Acceleration Base Motion .
  2. Optional: Enter a descriptive Name.
  3. Select a Degree of freedom.
    The degree of freedom is the global direction (translation or rotation) for which the base motion is being defined.
  4. Specify a magnitude for the Acceleration.
    This value acts as a multiplier for the values given by the amplitude curve.
  5. Optional: Enter a Scale factor.
    A scale factor is a multiplier used to scale the amplitude values.
  6. Optional: Specify an Amplitude and Phase angle.
    The amplitude curve defines the magnitude of the feature during the step. The phase angle for the amplitude curve determines the real (in-phase) and imaginary (out-of-phase) parts of the magnitude. A phase angle of 0ยบ indicates a value with no imaginary component.
    Note: Phase angles are available only for a harmonic response simulation step.
  7. Click OK.