Create distributed load excitations

You can create distributed load excitations for Transient, Frequency, or Random events. These steps assume you applied one or more loads in the Dynamics Subcase prior to solving the solution (see Define Dynamic loads for distributed-load excitations). When you solve, each load you created in the Dynamics Subcase generates a load set, which determines the load distribution you can scale (using a function) to create a distributed-load excitation.

1. Use the Functions and Graphing tools to create the XY table function to be used in the excitation. For information about creating and managing functions, see the Functions and Graphing help.

2. Make sure the AFU file that contains your excitation function is opened in the XY Function Navigator (in the XY Function Navigator, right-click AFU Files – XY Tabular Functions and choose Open).

3. In the Simulation Navigator, right-click the Excitations node (under the current Event node) and choose New Excitation→Distributed Load.

4. In the New Distributed Load Excitation dialog box, type a name for the excitation in the Name box.

5. From the Selection Method list, select the method for specifying the location of the excitation.To select the location of the excitation directly in the graphics window, select Graphic Selection. To select the location of the excitation from a list of load sets, select List Selection.

6. Select the load set to define as the excitation location:If you selected Graphic Selection, click the location on the model where you want to define the excitation (each load set highlights as you move the mouse over it). If you selected List Selection, click . In the Select Excitation Location dialog box, select a load set from the list and click OK.

7. Click the button that appears next to the Function box or the direction check box and choose Function Manager.

8. In the XY Function Manager dialog box, select an existing function from the list. This function allows you to scale the load over time or spectra. Note: If you use multiple excitations in an event, the functions must have the same X Minimum and X Increment values. These values determine the number of points in the function. Functions with different numbers of points (or with the incorrect ordinate data types for the excitation type) appear in red and cannot be selected.You can also click New to create a new function.The type of function you must use to scale the load depends on whether your event is Transient, Frequency, or Random:Transient — Time functionFrequency — Spectrum functionRandom — PSD functionFor distributed load excitations, you can use only functions with Ordinate Data Type of Unitless Scalar.

9. Click OK to accept the function and return to the excitation dialog box.

10. In the Scale Factor box, type a multiplier by which to further scale the load. The function typically represents the baseline value that you use for several different situations. The Scale Factor allows you to tailor the excitation magnitude for the specific situation.

11. If you are working with a Frequency event, in the Phase Angle box, enter the phase difference between two excitations.

12. Click OK to finish creating the excitation.

The Response Dynamics Details View subpanel in the Simulation Navigator displays the details of the excitation, including the load set ID, ordinate type, and scale factor.

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Create distributed load excitations, Simcenter 3D 2021.1 Series

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