Time History {Type} Functions

Access the Time History {Type} Functions form as follows:

Click the Define menu > Functions > Time History command to display the Define Time History Functions form. Then do one of the following:

Select {Type} from the Choose Function Type to Add drop-down list and click the Add New Function button
Select a previously defined function and click the Modify/Show Function button.

Use this Time History {Type} Functions form to specify a time history function based on a selected function type.

Function name edit box. Specify the name of the time history function or use the default.
Parameters edit boxes. Specify the parameters that define the template time history function in this area. Those parameters vary for different templates. The parameters specified for each of the templates are described in the following hyperlinked topics.
Time History Sine Function Definition Form
Time History Cosine Function Definition Form
Time History Ramp Function Definition Form
Time-History Sawtooth Function Definition Form
Time-History Triangular Function Definition Form
Define Function area. This area displays the Time and function Values for the time history function. The values update every time the template parameters are redefined.

To edit the values directly, convert the function to a user defined function by clicking the Convert to User Defined button. Then use the Add, Modify, and Delete buttons to make the appropriate changes.

Type the time and function value corresponding to a single point of the function into the edit boxes at the top of this area. Then click the Add button. Enter the points in any order; they will be sorted by ascending time. Time values must be unique (i.e., time values cannot be duplicated).

To modify an existing pair of values, highlight them in the list box. Note that they appear in the edit boxes at the top of the area. Type revised values in the edit boxes and click the Modify button.
To delete an existing pair of values, highlight them in the list box and click the Delete button.
Function graph area. This area displays a graph of the function. It updates automatically as you redefine the template parameters. If your computer has any problem with the automatic update, click the Display Graph button located just below the graph.

Run the mouse pointer over the function graph and a dot appears along the line representing the time history function. The coordinates of the dot are reported in the box just below the graph.

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