Create a Random VATV Forced Response solution

This example shows how to perform a Random VATV Forced Response on a VATV representation of a FEM model. You apply a solved VATV to the component FEM or assembly FEM and then apply a Turbulent Boundary Layer (TBL) model to compute the acoustic response.

You first compute Vibro-Acoustic Transfer Vectors (VATVs) using a Simcenter Nastran SOL108 Vibro-Acoustic Transfer Vector or SOL 111 Vibro-Acoustic Transfer Vector solution.

For more information, see VATV Set Workflow

1. Open a Simulation File and replace the FEM component or assembly FEM with the VATV Set by editing the representation.For more information, see Replace different FEM files with an ATV set or VATV set

2. Choose the Acoustics and Vibration tab → Random VATV Forced Response . Creates a new Random VATV Forced Response solution in the Simulation Navigator.

3. In the Vibro-Acoustic Transfer Vector dialog box, choose the Result Node Reference from theSimulation Navigator, or Result File to import a VATV .op2 file. A VATV file has the format modelname_VATV.op2For more information see Vibro-Acoustic Transfer Vector dialog box.

4. Click OK

5. In the Turbulent Boundary Layer Model dialog box: In the Transient Mesh Selection group, do one of the following:Select All VATV Faces.All the acoustic mesh will be excited.Select Custom Region. Note: When you select Custom Region, the intermediary mesh will be loaded to the graphics window. Then you select the faces to apply the TBL. Loading a large VATV intermediary mesh may take time.Select the desired VATV faces. In the Correlation Spectrum Definition group, select the Correlation Spectrum Definition Model.In the Auto-Spectrum Definition group, select the Auto-Spectrum Definition Model.In the Parameters group, set the parameters for the Turbulent Boundary Layer model you have selected.For more information, see Turbulent Boundary Layer Model dialog box.

6. Click OK.

7. In the Simulation Navigator right-click Random VATV Force... and select Edit...

8. In the Edit dialog box, select Auto Power Spectral Density, Cross Power Spectral Density, or both to define the output request.If you click Cross Spectrum Density and choose Subset of Nodes for the Node Selection, you select the First Response Nodes and Second Response Nodes from the model.

9. Click OK.

10. In the Simulation Navigator right-click Random VATV Force... and choose Solve...

11. In the Export and Solve dialog box, select Solve.

12. Click OK.When the Pre-Solver completes, close all the Information windows.

13. In the Simulation Navigator right-click the Results node, choose **Post-Processing Scenario...**For more information, see Create and edit post-processing scenarios.

Learn more

Random VATV Forced Response

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

Create a Random VATV Forced Response solution, Simcenter 3D 2021.1 Series

© 2020 Siemens

window.mainLanguage="en_US"

window.delivId=""

window.projectId=""

MathJax.Hub.Config({ TeX: { extensions: ["autoload-all.js"] }, tex2jax: { displayMath: [ ] }, "SVG": { scale: 125 } });