Create a Load Identification solution

When you perform a Load Identification solution you can use an existing FEM file and Simulation file or you can create a new empty FEM file and Simulation file.

1. Choose the Acoustics and Vibration tab → Load Identification . A Load Identification solution appears in the Simulation Navigator.

2. In the Simulation Navigator right-click Load Identification and choose Edit.The Solution Options dialog box opens.

3. In the Solutions Options dialog box, choose the Coordinate System for the Load Identification solution.

4. Choose Native(Local) or Absolute(Global) coordinate system to compute forces.

5. Click OK.

6. In the Simulation Navigator, right-click Vibrations and choose Edit.

7. In the Vibrations dialog box, enter the file name and path or Browse to the Data Source file.

8. In the Data group, select Refresh to populate the data.Physical Quantity lists the data input, based on the Data Source contents.

9. Click OK.

10. In the Simulation Navigator, right-click Frequency Response Function and choose Edit.The Frequency Response Functions dialog box opens.

11. In the Type group, choose Direct Stiffness (F/x) or Inverse Stiffness (x/F).

12. Choose the Result Node from the Simulation Navigator or Data File to import the FRF data.

13. In the Data group, select Refresh to populate the data.The Physical Quantity lists the input data type, based on the Data Source file, and whether you have chosen Direct Stiffness (F/x) or Inverse Stiffness (x/F).

14. In the Subcase list, select the subcase you will use, and click OK.

15. In the Simulation Navigator, right-click Mapping and choose Edit.The Mapping dialog box opens.

16. Automatically Populate the FRF functions. The FRF functions are listed in the Matching Table Ids list. Note: FRFs listed in green have valid mapping of response node and function. FRFs listed in red have invalid mapping due to missing data. It is recommended that invalid FRFs be deleted from the mapping table.

17. To edit an FRF, select a function in the Matching Table Labels list.Select an excitation node in the Vibration Nodes list and press Active Node.In the Vibration Node list, select a node as the response node and select Passive Node.The assigned Active Node and Passive Node appear in the Matching Table Labels function list.

18. Click OK.

19. In the Simulation Navigator, right-click Load Identification node, and choose Solve

20. Click OK.The pre-solver starts and computes the loads. When the pre-solver solution completes, close all the information windows.

21. In the Simulation Navigator right-click the Results node and choose Post-Processing Scenario.When you are post-processing forces to display the positive and negative variation of the forces across the frequency spectrum use Function Plot group→Complex Options→Real Only→OK to display the positive and negative variation of the forces across the frequency spectrum.For more information about post-processing the results, see Create and edit post-processing scenarios.

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Create a Load Identification solution, Simcenter 3D 2021.1 Series

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