Alternate representation (standalone FEM file)

You can apply an alternate representation, such as a Mode Set, FRF Set, Acoustic Transfer Vector (ATV) Set, or Vibro-acoustic Transfer Vector (VATV) Set, to a standalone FEM file. You can also apply alternate representations to component FEM files in an assembly FEM file.

Replacing the standalone FEM file with an alternate representation allows you to reuse a superelement, Mode Set, FRF Set, ATV Set, or VATV Set. You can then solve new solutions (except for VATV response solutions) with different constraints , excitations, or active modes to evaluate the effect on the structural response.

Note:

VATV response solutions support only the application of different loads because the VATV matrix already contains boundary conditions and constraints.

• For Mode Sets and FRF Sets, the data source can be OP2, UNV, and Simcenter Testlab files.

• For superelements, ATV Sets, and VATV Sets, the data source can be OP2 files.

Note:

If the Simulation file is the work part, you can select solution results from the Simulation Navigator.

The general workflow for replacing a standalone FEM file with an alternate representation is as follows:

1. In the Simulation Navigator, assign a superelement, Mode Set, FRF Set, ATV Set, or VATV Set to the FEM file.If the data source you select contains multiple Mode sets, you can select only one of the sets.If the data source you select contains multiple FRF sets, you can select a combination of the sets. The software merges the sets into one FRF Set. However, if the sets you select contain duplicates, the Information window opens with a warning message and a list of the FRFs. You can exclude duplicate FRFs in the dialog box, or you can remove them from the original file. For Simcenter Testlab files that contain timestamps, you can let the software select the FRFs with the most recent timestamp. If your source file does not contain timestamps, you must manually select the FRFs to avoid duplicates. For information on selecting the FRFs, see Mode Set / Frequency Response Function Set / Acoustic Transfer Vector Set / Vibro-Acoustic Transfer Vector Set dialog box.If the data source you select contains multiple VATV sets, you can select only one of the sets.

2. Create a new solution.Note: If you replaced the FEM with a Mode Set, edit the solution as follows:On the Bulk Data page, in the Parameters (PARAM) group, click Create Modeling Object .In the Solution Parameters dialog box, from the AUTOMPC list, select YES.Activating the AUTOMPC parameter allows superposition of a free-free Mode Set with new constraints.

3. (Optional) Edit a Mode or FRF Set to activate or deactivate the modes you want.For more information, see Edit a mode set or FRF set.

4. Apply boundary conditions, such as constraints, excitations to an FRF Set, or frequency solution range to an ATV Set or Mode Set, and then solve the solution.

5. Evaluate the results.

Learn more

Alternate representation (component FEM file)

Visualization elements (PLOTELs) in assembly FEM files

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Related Topics

Assembly FEM

Alternate representation (standalone FEM file), Simcenter 3D 2021.1 Series

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