Tolerance analysis

This lesson illustrates how to analyze the variability of the computed parameters we created in Adding Equations to a Model.

  1. Select Default Tolerances... from the Edit menu, and click the Dimensions tab to see the default settings for dimensions.
  2. Change the default tolerance for linear dimensions to 0.01. Click OK to save your changes.

  3. Select the P variable from the parameter table.

    Select P

  4. In the Property Explorer’s Tolerance area, select +/- or Symmetric from the Type selection list, and specify a tolerance of +/- 50 as shown below.

    Set P tolerance
  5. In the same way you set the tolerance for the P variable, set the L variable's tolerance to +/- 0.1.
  6. Select the S variable from the parameter table, and select Analyze Tolerance from the Analysis menu. Concept generates a tolerance report in the Modules view spreadsheet.

  7. Click the maximize button Maximize button in the upper right corner of the Modules view to maximize the view so you can see the entire tolerance analysis report. To see the Advanced Contributor section, scroll to the right of the report.

  8. To see the sub-contributors for the complex contributors b and h, click the expand button to the left of their rows.

  9. Click the Restore button Restore button in the upper right corner of the maximized spreadsheet to return the Modules view to its normal docked size.
  10. Save the file.

Next, we'll back-solve from a computed variable to derive the value of a dimensional parameter.