Basic Screening Risk Analysis

Use SnRD to identify Squeak and Rattle issues.

This tutorial describes the basic screening analysis that the S&R analyst would perform. Starting from a NVH FE-model, the analyst wants to define a first set of Evaluation-lines (E-Lines) to assess the S&R performance of a system. Typically, this first analysis will occur at the early stage of the virtual development process, thus a lack of input might be a road blocker for the S&R CAE engineer. Therefore, the SnRD simple process will close this gap by offering automation and a set of default settings enabling this first analysis.

Typical information lacking at this stage of the development are:
  • Interface to be analyzed
  • Detailed Gap, dimensioning and tolerance data
  • Loading Conditions

The objective of this tutorial is to create E-Lines to evaluate Squeak and Rattle, define a SineSweep loadcase, and evaluate risks.

Before you begin, copy the file(s) used in this tutorial to your working directory:

Import Model

In this step, you will use the Import tool to import the required set of files.

  1. Using the file browser option in the Model Import field, browse and select the tutorial_ip_snr_model.hm file.
  2. Click Import.
    The selected model is imported to the session.
    Figure 1.

Create Geometric Lines

In this step, you will define the interface between components by using the Create Geometric Lines tool to create geometric lines in the model.

  1. In the HyperWorks toolbar, click option, and select QuickReviewComps.
    Figure 2.
    The components you want to include in the evaluation are isolated.
  2. From Setup group, select Define Interface.
    Figure 3.
    A guide bar opens.
  3. From the guide bar, click to open advanced options.
    Figure 4.
  4. Enable the Min checkbox and enter 800 as the input value.
  5. Select the complete model from graphics area.
  6. Click .
    The geometric lines are created at the component edges in the model.

Create E-Lines

In this step, you will create and manage all the E-Lines in the model.

Use Create E-Lines tool to create E-Lines at the interfaces.
  1. From Setup group, select Create E-Line tool.
    Figure 5.
    A guide bar opens.
  2. From the guide bar, select all the components for Components.
  3. For Lines, select all the lines.
  4. Enable the Realize checkbox.
  5. Click .
    Eleven E-Lines are created in the model.
    Figure 6.

Manage E-Lines

In this step, you will use the Manage E-Lines tool to review E-Lines in the model.

  1. From Setup group, select Manage E-Lines > Review E-Lines.
    Figure 7.
    table will appear. Use arrows to review one E-line at a time.
    Figure 8.
    The Review E-Line table opens.
  2. Use the arrows to review each E-Line.

SineSweep Loadcase Setup

  1. From Setup group, select Dynamic Event.
    Figure 9.
    A guide bar opens.
  2. From the guide bar, click to view advanced options.
  3. For Output Frequency under Time Step, enter 4.
    Figure 10.
  4. In the graphics area, select the node shown in Figure 11.
    Figure 11.
    A microdialog opens.
    Figure 12.
  5. For dislacement, select D.
  6. For Load Curve, select SineSweep.
  7. For load direction, select Z.
  8. Click .
    The SineSweep loadcase is created. The Curve Editor dialog opens.
  9. Review the SineSweep load curve and close the Curve Editor dialog.

Export OptiStruct Solver File

  1. From Analyze group, select Export OptiStruct Solver File.
    Figure 13.
    The Model Export dialog opens.
    Figure 14.
  2. Click Export.
    A folder selection dialog opens.
  3. Browse and select the required folder.
    The OptiStruct solver deck file is exported to the selected folder.
Use the exported .FEM solver deck to solve with OptiStruct solver. Once completed, two result files are generated: .H3D and .PCH. These files will be used in the Post Processing of results.

Risk Assessment

In this step, you will evaluate risks for Squeak and Rattle in the Risk Assessment.

  1. Open Risk Assessment.
    Figure 15.
  2. If not already selected, select the model file (.fem).
  3. Select the .pch file generated after solving the model file.
    The Sinesweep loadcase is selected in the Load Step list.
  4. In the Rattle Tab, select Relative Displacement MAG.
  5. Click Plot.
    The Relative Displacement for the E-Lines are visualized.
    Figure 16.
  6. Optional: Review the summary of all E-Lines in the model for the active loadcase and result file by clicking .
    Tip: If loading results are from additional result files and loadcases, then these results will be appended to the Summary Table which allows you to conduct easy comparisons of design iterations.

Generate Summary Report

In this step, you will export a Squeak and Rattle summary report using the HyperWorks Report tool.

Learn more about the HyperWorks Report tool.
  1. In the active HyperWorks session, click Report.
    The Report ribbon opens.
    Figure 17.
  2. Click Capture.
    Figure 18.
  3. From the Add Module dialog, click Capture Session.
    The Report tab is opened and the report module is added in the tree.
  4. Click Export.
    Figure 19.
    This will execute the module and generate outputs. A file browser window will appear.
    The module is executed and outputs are generated. A file browser dialog opens.
  5. For File Name, enter SnR Risk Summary Report and click Save.
    The document report is automatically generated.
    Figure 20.