Command reference help topics
Evaluate FRF / Evaluate Transmissibility dialog box
| Result | |
|---|---|
| Result | Specifies the type of result to generate.Note: The available result types depend on the output requests you enabled in the Structural Output Request for the solution. For more information, see Define Response Dynamics result types.DisplacementVelocityAccelerationStressStrainShell Stress ResultantReaction Force |
| Enforced Motion Input | |
| Available only on the Evaluate Transmissibility dialog box. | |
| Input Motion Type | Specifies the type of input for which to evaluate the response:DisplacementVelocityAcceleration |
| ID | Displays the DOF (the ID number of the node and the direction of the applied force) associated with an enforced motion excitation location. |
| Excitation Location List | Opens the Select Excitation Location dialog box, where you can select a single DOF (node ID plus direction) from your previously defined enforced motion location. For information about creating excitation locations, see Specify excitation locations. |
| Input Node | |
| Available only on the Evaluate FRF dialog box. | |
| Select Node | Lets you select the node on your model where you want to define the unit input load. |
| Label | Lets you specify the node by node label.Press enter or click Select to add your entry.To edit your entry, click Edit Node Selection . |
| Input Direction | |
| Data Component | Lets you select the direction of the unit input load. |
| Output Nodes/Output Elements | |
| Appears as Output Elements when Result is set to Stress, Strain, or Shell Stress Resultant. | |
| Select Node/Select Element | Lets you select the nodes or elements on your model where you want to evaluate the response. |
| Node Labels/Element Labels | Lets you add nodes or elements to the selection.Use a space or comma to separate your entries.Use a colon or a dash to add a range of labels.For example, enter 1:10 or 1-10 to add all the labels from 1 to 10.Use colons to add an incremented range of labels.For example, enter:1:9:2 to add labels 1, 3, 5, 7, 9.1:10:2 to add labels 1, 3, 5, 7, 9, 10.10:1:-2 to add labels 10, 8, 6, 4, 2, 1.Press enter or click Select to add your entries.To edit your selection, click Edit Node Selection/Edit Element Selection . |
| Output Request | |
| Data Component | Lets you select the direction in which to evaluate the response output. |
| Observation Node | |
| Available only when Result is set to Displacement, Velocity, Acceleration, or Reaction Force. | |
| Relative to Node | Determines whether the response is evaluated relative to a node you select or whether the response yields overall absolute results. Select this check box to evaluate the response relative to a node you select. |
| Select Node | Available only when Relative to Node is selected.Lets you select a node on the model relative to which to evaluate the response. |
| Label | Lets you select a node on the model relative to which to evaluate the response by node label.Press enter or click Select to add your entry.To edit your selection, click Edit Node Selection . |
| Elemental Data Location | |
| Available only when Result is set to Stress or Strain. | |
| Beam Elements | Available only for beam elements.If you are evaluating stress or strain for beam elements, select the stress recovery point on the beam cross section where you want to recover response results. The letters C, D, E, and F correspond to the four stress recovery points on a typical beam section. |
| Shell Element Layer | Available only for shell elements.For shell elements, select the region over which the stress and strain should be calculated: Top, Middle, or Bottom. |
| Location | Lets you specify the evaluation location as only the element centroid, corner points, or both centroid and corner points. |
| Property | |
| Method | Lets you select whether to show the results of the evaluation as a Range of frequencies or as a threshold of the Modal Contribution frequency. Modal Contribution generates a polar plot (the results are generated at the frequencies you select). The polar plot displays the complex numbers in a circular grid representing amplitude and phase angle. Each arrow on the polar plot represents a mode at an output node on the model. For more information about this option, see About Modal Contribution. |
| Frequency Start Value | Available only when Method is set to Range.The starting frequency in the range of results to return. |
| Frequency End Value | Available only when Method is set to Range.The ending frequency in the range of results to return. |
| Additional Spectral Lines | The number of additional frequencies for which to calculate results. The software calculates the frequencies between the natural frequencies of the model within the specified frequency range. |
| Interpolation Method | The approximation method for inserting any additional spectral lines. |
| Frequency selection method | Available only when Method is set to Modal Contribution.Determines how you specify the frequencies for which to obtain results.From Graph — Lets you select one or more frequency points from a plotted function (with abscissa type of Frequency). If there is no plotted function when you choose this method, the Equation Selection dialog box appears, from which you can choose a function to plot.From List — Lets you select one or more normal mode frequencies.You can use both selection methods to define your evaluation; for example, you can choose From Graph and select two frequencies from the plotted function and then change the frequency selection method to From List and select another frequency from the list. |
| Frequency list | Available only when Method is set to Modal Contribution.Displays the modal frequency you selected in the Natural Frequencies dialog box or selected from the plotted function. |
| If From Graph is selected, lets you select points on a plotted function for which to obtain FRF or transmissibility results.If From List is selected, this button opens the Natural Frequencies dialog box, where you can select one or more normal modes for which to obtain FRF or transmissibility results. This option lets you evaluate the response of specific normal modes. | |
| Generate Maximum Contributors Only | Limits the points in the generated response function to only the modes that contribute most to the overall amplitude and phase at the selected input frequencies. |
| Number of Contributors | Available only when Generate Maximum Contributors Only is selected.Specifies the number of largest-contributing modes to include in the Modal Contribution evaluation. For example, if the number is 5 (the default number), the generated response function will contain six points: a mode 0 point that represents the total amplitude from all the modes (all the modes in your solution results—not just the sum of the largest contributors) and five points for the five modes that contribute the most to the response. |
| Normalize Results | Available only when Generate Maximum Contributors Only is selected.Sets the total amplitude (shown in mode 0) for all the modes to a value of 1.0 and sets the other contributing modes in the response relative to this value. This lets you easily see the fraction of the total that is contributed by each mode. |
| Output Setting | |
| Store to AFU | Saves the generated response function(s) to an AFU file. This option is useful if you will be evaluating contour 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. |
| XY Graphing | Plots the response function as an XY graph in the graphics window. |
| Record Name Prefix | Lets you enter a descriptive prefix to identify the generated function records in the AFU file in which they are saved. |
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Evaluate FRF / Evaluate Transmissibility dialog box, Simcenter 3D 2021.1 Series
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Source: https://docs.sw.siemens.com/en-US/doc/289054037/PL20200601120302950.advanced/id630861 · retrieved 2026-07-17