Learn more about Model-Based Calibration

Automated Tradeoff

Once you have set up an optimization you can fill tables in a tradeoff using automated tradeoff. You can select cells and fill them from the results of an optimization. The cells you select in the tradeoff table define the operating point set for the optimization.

Set up a tradeoff as follows (also described in Setting Up a Tradeoff Calibration).

1. Select File > New > Tradeoff.

   This takes you to the Tradeoff view. You need to add tables to the tradeoff.

2. Click   (Add New Table). This opens the Table Setup dialog.

3. Enter Spark as the table Name.

4. Select L as the Y name and N as the X name.

5. Click Select to open the Select Filling Item dialog.

   1. Select the radio button to Display variables.

   2. Click to select SPK.

   3. Click OK to return to the Table Setup dialog.

6. Leave 10 as the size of the rows and columns (the speed and load axes), and 0 as the initial value, and click OK.

   A new Spark table appears in the Tradeoff tree. CAGE has automatically spaced the normalizers evenly over the ranges of N and L.

7. Click to expand the New_Tradeoff tree and select the Spark table node to view the new table.

You need to select the cells where you want to apply automated tradeoff. Create a region within the table:

1. Highlight a rectangle of cells in the SPK table by clicking and dragging. Note that a large region can take a very long time to evaluate. Try four cells to start with.

2. Click   (or right-click and select Extrapolation Regions > Add Selection) to define the region. The cells become light blue.

To use automated tradeoff on the cells in the defined region,

1. Select Inputs > Automated Tradeoff or click the toolbar button .

   The Automated Tradeoff dialog appears, showing a list of available optimizations in your session that are set up and ready to run.

   

2. Select your Optimization_1 multiobjective optimization to apply to the tradeoff and click OK.

3. Click OK in the following dialog to optimize only the table cells that are in the region, rather than all cells.

The automated tradeoff optimization runs. The results appear in the selected cells in the table, as shown in the example. You could optimize several regions and then use these results to extrapolate across the whole table.

Sum Optimization

Worked Example Optimization

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