PCA workflow

Step	Summary	Detailed help topic
1.	Create a FEM file.	Create a FEM file using the Simcenter Nastran Vibro-Acoustic Fem template. Set the Solver to Simcenter Nastran and set the Analysis Type to Vibro-Acoustic.	Create a new FEM file
2.	Create a Simulation file.	Create a Simulation file using the Simcenter Nastran Vibro-Acoustic simulation template, and close the Solution dialog box because this workflow does not require a Solution Type.	Create a new Simulation file
3.	Create the solution process.	On the ribbon bar, select the Acoustics and Vibration tab and click Principal Component.A node with this name appears in the Simulation Navigator.
4.	Import cross-power data.	In the Simulation Navigator, expand the solution node, right-click the Cross Powers node, select Edit, and use the Cross Powers dialog box to import an external file that contains measured auto-power and cross-power data on the same range of frequencies and where the cross-power terms are of the same physical type. The input file must be a Simcenter Test.Lab Project File (*.lms).
5.	Select the hierarchy level to be processed.	In the Options group, use Hierarchy Level for Subcase to specify the level to which folder names are concatenated to simulate subcases.
6.	Select the data types to be processed.	Click the Refresh icon to populate the data from the imported file to the fields in the Subcases and Nodes data tables. After the software populates the data, you can access and change the data. For example, you can select reference and response nodes in the Nodes tab lists or let the software automatically select them when the Automatic Node Selection check box is selected.
7.	Define Singular Value Decomposition (SVD) parameters.	In the Singular Value Decomposition group, set parameters for the SVD calculation. For example, when you set the Singular Value Filter to Relative Threshold and Relative Threshold for Singular Values % to 0.0, the software does not filter values below any threshold.	Specifying forcing frequencies for a frequency response analysis
8.	Visualize the preprocessed data.	After you import the external file, you can generate function plots of the auto-power and cross-power response functions as follows:In the Simulation Navigator, right-click the Cross Powers node, choose Post-Processing scenario, in the Scenario Based Data-Visualization navigator, right-click a Function Plots post-processing view, select Plot, and choose a function that, for example, plots acceleration over frequency on a selected node.
9.	Define the solver parameters.	In the Solver Parameters dialog box, specify the location of the solver, parallel processing parameters, and so on.	Edit Solver Parameters dialog box
10.	Solve the model.	In the Simulation Navigator, right-click the solution node and choose Solve to compute the principal components.Note: During this step, the solver writes the results to an *.xml file and the pre-solver converts the *.xml file to a simulation_file_name-solution_name-results.sc_h5 file that can be used for post-processing.In the Solution Monitor, the solver reports the reference and response degrees of freedom used in the PCA analysis .
11.	Post-process the results.	Select the results and choose Post-processing Scenario.In the Simulation Navigator, do the following:Right-click the simulation_file_name-solution_name-results.sc_h5 file.Choose Plot, Function Plots, and Functions.Choose, for example, the following response function:**Root	VIRTUAL_REFERENCE_AUTOPOWER

Learn more

Principal component analysis

Remote solving workflow (Linux)

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

PCA workflow, 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 } });