Defining a Load Excitation Set

This task will show you how to define the load excitation set in a:

• harmonic dynamic response analysis case
• transient dynamic response analysis case

Defining a load excitation set allows you to define the force type load you will apply.

Only available with the Generative Dynamic Response Analysis (GDY) product.

Harmonic Dynamic Response Case

Open the sample57.CATAnalysis document from the samples directory.

• Insert a Harmonic Dynamic Response Analysis Case (and choose a load excitation set).
• Define a white noise modulation or define a frequency modulation.

1. Double-click the load excitation set from the specification tree.

   In this particular case, double-click Load Excitation.1 under the Harmonic Dynamic Response Case set. The Load Excitation Set dialog box appears. Name: gives the name of the excitation set. You can modify it. Selection:  Selected load: lets you select the load you want to excite. You cannot reference load set belonging to a preprocessing case. Selected modulation: lets you select a white noise modulation or a frequency modulation. You cannot select a time modulation. Selected factor: lets you select the factor that will multiply the modulation. Selected phase: lets you associate a phase component of a dynamic load excitation (load, modulation and factor).

2. Set the desired parameters in the Load Excitation Set dialog box.

   In this particular example: Select Pressure.1 as Selected load. Select Frequency Modulation.1 as Selected modulation. Enter 1 as Selected factor value. Enter 2deg as Selected phase value.

3. Press Enter to update the Load Excitation Set dialog box.

   The Load Excitation Set dialog box appears as shown below: You can add or delete load excitation parameters using contextual menus in the Load Excitation Set dialog box. The available contextual menus are: Add: lets you add a load excitation. Delete: lets you delete a load excitation. Delete All: lets you delete all the load excitations you have previously defined.

4. Right-click in the frame and select the Add contextual menu.

5. Select the desired load, modulation, factor and phase.

   In this particular example: Select the Loads.1 set as Selected load. Select the White noise.1 as Selected modulation. Enter 2 as Selected factor value. Enter 1 as Selected phase value.

6. Right-click the second line and select the Delete contextual menu.

7. Click OK.

Transient Dynamic Response Case

Open the sample57.CATAnalysis document from the samples directory.

• Insert a Transient Dynamic Response Analysis Case (and choose a load excitation set).
• Define a time modulation.

In this particular example, a transient dynamic response case and a modulation set have been already inserted.

1. Double-click the load excitation set from the specification tree.

   In this particular case, double-click Load Excitation.1. The Load Excitation Set dialog box appears. Name: gives the name of the excitation set. You can modify it. Selection:  Selected load: lets you select the load you want to excite. You cannot reference load set belonging to a preprocessing case. Selected modulation: lets you select a time modulation. You cannot select a frequency modulation. Selected factor: lets you select the factor that will multiply the modulation.

2. Select the load you want to excite in the specification tree.

   In this particular example: Select Pressure.1 as Selected load. Select Time Modulation.1 as Selected modulation. Enter 1 as Selected factor value.

3. Press Enter to update the Load Excitation Set dialog box.

   The Load Excitation Set dialog box appears as shown below: You can add or delete load excitation parameters using contextual menus in the Load Excitation Set dialog box.

4. Click OK.