To use a parametric function to define a time history load, use the following procedure.

1. On the Loading ribbon tab, select the Time History > Forcing Function tool in the Dynamic Specifications group.
   
   The Add New: Time History Definitions dialog opens.
2. Type an Integration Time Step value in seconds.
3. (Optional) Select the Consider Missing Mass Mode option if necessary.
4. (Optional) Select the Save option to generate a file with time history data.
5. Select the Loading Type for your data:

   Acceleration

   or

   Force

   or

   Moment

6. Select the Harmonic Function option in the Function Options group.
7. Select the harmonic function to use: SINE or COSINE.
8. Select one of the options for specifying wave length:

   select Frequency and enter a cyclic frequency in cycles/sec.

   or

   select RPM and enter the revolutions per minute

9. Specify the harmonic wave parameters:
   1. Enter the Amplitude in the units indicated. These correspond to the current input units and the Loading Type selection.
   2. (Optional) Enter the Phase angle in degrees.
   3. Enter the number of Cycles of loading.
10. Specify the number of time steps per cycle by either:

    select the Step option and enter the time step of the loading.

    or

    select the SubDiv option and enter a number of subdivisions per quarter cycle (i.e., from zero to peak amplitude along the sine or cosine wave).

11. Click Add.