Setting Up a Sensitivity Analysis

Follow this procedure to set up a sensitivity analysis. Once you have created a setup, you can Copy and Paste it, then make changes to the copy, rather than redoing the whole process for minor changes.

1. Before a variable can be included in a sensitivity analysis, you must specify that you intend for it to be used during a sensitivity analysis in the DesignProperties dialog box.
2. Select Twin Builder > Optimetrics Analysis > Add Sensitivity . The Setup Sensitivity Analysis dialog box appears.

3. Under the Calculations tab, type the maximum number of iterations per variable value for Twin Builder to perform in the Max. No. of Iterations/Sensitivity Variable text box.
4. Set up an output parameter calculation and select a Master Output.
5. Specify the value of the design point at which the sensitivity analysis should stop in the Approximate Error in Master Output text box.
6. In the Variables tab, specify the Min/Max values for variables included in the optimization, and the Initial Displacement (Initial Disp.) for the analysis.

   You can also override the variable starting values by selecting the Override check box and entering the desired value in the Starting Value field.

7. In the General tab, specify whether Optimetrics should use the results of a previous Parametric analysis or perform one as part of the optimization process.

8. The following optional sensitivity analysis setup options can also be used:
   • Modify the starting variable value.
   • Modify the minimum and maximum values of variables that will be solved.
   • Exclude variables from the sensitivity analysis.
   • Set the initial displacement.
   • Modify the values of fixed variables that are not being modified during the sensitivity analysis.
   • Set linear constraints.
   • Request that Optimetrics solve a parametric sweep before a sensitivity analysis.
   • You can also request that Optimetrics solve a parametric sweep during a sensitivity analysis.
   • Set HPC and Analysis Options, which lets you select or create an analysis configuration. Enable a fast calculation-update algorithm to speed up Optimetrics and report updates during Optimetrics analyses. By default, the fast calculation-update option is enabled whenever it is applicable.

   • Select the Perform Worst Case Analysis option for an extreme value analysis that focuses on the upper and lower boundaries of all the analyzed parameters. Some setup is required before performing a worst case analysis.

Related Topics 

Sensitivity Analysis Overview

Setting the Maximum Iteration Per Variable