Evaluate FRF or Transmissibility

1. Create and solve the solution and then create the Response Dynamics solution process.

2. Open the Evaluate FRF or Evaluate Transmissibility dialog box by right-clicking the Response Dynamics solution process node and choosing Evaluate FRF or Evaluate Transmissibility.

3. Under the Result group, choose the type of results to evaluate (for example, Acceleration, Velocity, Displacement, and so on). The available types depend on the result types you chose in the Structural Output Request for the solution.

4. If you are evaluating FRF: In the graphics window, select the node on your model where you want to apply the unit force load. Or, you can type the node ID in the Label box and then click to confirm your entry.

5. If you are evaluating transmissibility: Under Enforced Motion Input, choose the type of enforced motion to apply: Acceleration, Velocity, or Displacement. Click Excitation Location List and choose the DOF to which to apply the unit enforced motion input. The list includes all DOFs set to Enforced in the enforced motion location.

6. Under Input Direction, choose the direction in which to apply the unit force load or enforced motion. If you are evaluating transmissibility, the available directions correspond to the DOFs you set to Enforced in the enforced motion location.

7. Make sure the Select Nodes (or Select Elements) line is highlighted under Output Nodes/Elements. In the graphics window, select all nodes or elements for which to evaluate the response. Note: You select elements when Result Type is set to Stress, Strain, or Shell Stress Resultant.

8. Under Output Request, choose the direction (for example, X, Y, Z, Rx, Ry, Rz) or directions (Translational Magnitude, All Translationals, All Directions) in which to evaluate the response.

9. Under Property, choose whether to show the results of the evaluation as a Range of frequencies or as a threshold of the Modal Contribution frequency. For information about each value and option under Property, see Evaluate FRF / Evaluate Transmissibility dialog box. For a general discussion of the Modal Contribution option, see About Modal Contribution.

10. Under Output Setting, choose the method for displaying and/or storing the generated response function. Store to AFU — Saves the generated response function(s) to an AFU file (the storage file for table functions). This option is useful if you will be evaluating response results and want to use the plotted response function to define the range of your evaluation (by picking data points on the graph). The AFU file is created automatically with the same name as your simulation file, in the working directory where your simulation file is located. For more information about AFU files, see Manage AFU Files in the Functions and Graphing help.XY Graphing — Plots the response function as an XY graph in the graphics window.

11. If you selected Store to AFU, type a prefix in the Record Name Prefix box to identify this function record in the AFU file.

12. Click OK.

Learn more

FRF and Transmissibility

About Modal Contribution

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

Evaluate FRF or Transmissibility, Simcenter 3D 2021.1 Series

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