Creating Transient Motion Excitations

You can create transient dynamic base motion excitations in a transient dynamic scenario. A transient motion excitation defines a motion load on the system that scales as a function of time.

The base motion is defined by an acceleration function given for each coordinate direction over time.

Before you begin: A structural analysis simulation that contains a transient dynamic scenario must exist and must be open.
Related Topics
Defining Transient Dynamic Scenarios
Using Modulations
Reviewing Specifications

  1. In the Dynamic Excitations toolbar, click Transient Motion .

    The Transient Motion dialog box appears.

  2. Optional: In the Name box, modify the name of the excitation.

  3. Optional: By default, the motion components are defined relative to the fixed global axis system (fixed global rectangular coordinate system). To choose a different axis system, select User in the Type list, and select a user axis system in the specification tree.

    The name of the user axis system is displayed automatically in the Current axis box, and the motion components are defined relative to the specified rectangular axis system.

  4. In the Axis direction list, select the axis along which the motion is applied.

  5. Select a file to define the modulation that is a function of time.

    See Using Modulations.

  6. In the Acceleration box, enter an acceleration value.

  7. In the Phase box, enter an angle value to define the phase.

  8. Click OK.

    A transient motion appears in the specification tree under the active Transient Motions set.