Stochastics/DoE Post Processing

SnRD Post Stochastics and DoE module allows the analyst to investigate hundreds of simulation results in a powerful way. When multiple variational studies have been setup, and results imported, SnRD will automatically post process all the Rattle and Squeak results for high level and deep dive investigation. You can refer to Variabilities Analysis for more information.

The Stochastics tab is as shown below.
Note: To run the DoE/Stochastics post processing, you must load the FEM and pre_output.csv files in SnRD Main Tab first.


Figure 1.
The Stochastics tab allows you to perform the following operations -
  1. HyperStudy Results Database - file selection option to browse and select the XML file exported from Export Variations Study.
  2. Calculate - to read the run results data in the selected XML
    Note: Once you obtain the HyperStudy XML file and evaluates the xml file in hyperstudy as mentioned earlier, you must be able to see pch files generated for each run in the folder. SNRD Post enables us to display and visualize this results. At this stage , you can load the Hyperstudy xml in the Hyperstudy xml database in and click Calculate. On click of Calculate, the necessary information of each dynamic run is mathematically calculated using Compose and a SnR database is generated in the same folder. You can re-use this SnR database xml for further processing and save recalculation time.
  3. SnR Results Database - file selection option to browse and select the results database XML created from SnRD Stochastics post processing.
    Note: This feature is useful when you have already run a stochastics session and wants to re-use it.

    Data Filtering

  4. Active Database - to select the database for the post processing
  5. Selection - to make selections for the following options -
    1. E-Lines - to choose the ELines types


      Figure 2.
      1. All
      2. Rattle
      3. Squeak
    2. Line ID - to choose the required ELine ID.All Elines will be listed.
    3. Results - to select the result type -


      1. SnR Index - an Unit less criteria that describes Squeak or Rattle occurrence.
        • In the case of Rattle - Relative Displacement in Z higher than the Gap - Tolerance
        • In the case of Squeak - Max P2P higher than the Impulse Rate inverse.
      2. X
      3. Y
      4. Z
      5. MaxP2P
      6. MinP2P
  6. Show Runs - radio button option to display runs for All or Failed
  7. Vary Variables by - to apply variation values for -
    1. Percentage - percentage of variation from the nominal value
    2. Value - actual value used in the Run
  8. Show Variables - to select the runs for the parameters used for conducting the variations studies.
    1. All - will filter and display all the variations
    2. E-Modules - will filter and display only Youngs Modulus study
    3. Density - will filter and display only Density study
    4. Thickness - will filter and display only Thickness study
    5. Stiffness - will filter and display only Stiffness study
    6. Damping - will filter and display only Damping study
  9. After selecting the required filters, click Apply Filters. This will filter the run details and list the results in the below table.
    Note: To perform this, you will have to manually copy the summary.data file from rpt folder to approaches > sto folder.
  10. Display Results - this will filter the run details and plot the results for the same.

    Run Selection

  11. After filtering the results, runs will be listed in the table. Select the required run from the table using the checkbox against the run.
  12. Display Selection - to display the plots for the selected runs from the table.

    Evaluation Criteria Update -

    Regeneration of a new Database XML for all Stochastic Runs for a different GD&T/Impulse Rate data file. You select a new csv file and clicks Create Results DB. This new data base is loaded in the session and added to “Active Database”

  13. Select a new DTS file using the file selection option.