To Conduct a Multi-Objective Design Study
To conduct a multi-objective design study, you must define the design variables and the design goals. You can select dimensions or top-level model parameters (except integer parameters) as the design variables. For the design goals, you can select parameters that were created through the Analysis feature.
1. Click Analysis and then click the arrow next to Feasibility/Optimization. Click Multi-Objective Design Study. The Multi-Objective Design Study dialog box opens. The dialog box consists of two sections:
Table Tree—The first column displays the hierarchy of tables in the study, including the master table and derived tables. The second column is a feedback section, displaying the number of records for each table.
Table Data—Displays the Name and the number of Records for the currently active table at the top and the table contents below. Each row in the table represents a record of an experiment. Each record in the table includes a record number, values for the design goals, and design variables in individual columns. The names of the design goals and design variables are used as the column labels. You can resize the columns by dragging or double-clicking the column separators.
2. To create a new study, click File > New and specify a name for the study. To open an existing study, click File > Open and select the name of the study.
3. To set up a master table, click Setup > Variables/Goals. The Master Table dialog box opens.
4. In the Sampling Method drop-down, select Automatic or Manual as the method of sampling.
5. If you select the Automatic method, specify the following in the Master Table dialog box:
Click the Define Increments check box to set increments for the design variables. The Increment column appears in the Design Variables section of the Master Table dialog box.
Specify the increment value for each of the design variables or accept the default increment value. The default increment value is the difference between the maximum and minimum values of that design variable.
Design Variables—For each design variable, click to add a dimension or to add a parameter as a design variable in the study. The dimension or parameter that you add is included as a design variable in the study. Each design variable is assigned to a unique row of the Design Variables table. Specify its minimum and maximum values or accept the default values. You can also specify an increment for the variable if you have clicked the Define Increments check box. To delete a variable from the list of design variables, select the variable and click .
Design Goals—Click Select Goals. The Parameter Selection dialog box opens. Select the parameters that you want to include in your study and click OK.
6. If you select the Manual method, specify the following in the Master Table dialog box:
Under Run experiments on, specify one of the following:
All combinations—Calculates the number of experiments using all possible combinations of the sampling points defined for the design variables.
One per row—Sets the number of experiments as the number of rows that are defining the sample points in the Design Variables section of the Master Table.
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An error message is displayed if you do not specify the same number of sampling points for all design variables.
Specify the design variables and design goals as described for the Automatic method of sampling.
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Each design variable is assigned to a different column in the Design Variables table.
The following are also available in the Design Variable section of the Master Table:
—Inserts an empty cell above the cell that you select.
—Deletes the cell that you select.
—Deletes all the cells in the table.
—Opens a file browser that lets you select an ASCII text file of the CSV format. The file you import must not contain alpha characters. The number of columns in this file must be less than or equal to the number of design variables included in your study.
7. Click OK to accept the setup.
8. To review the setup, click Setup > Show setup.
9. To compute the master table, click Setup > Compute and type the number of experiments you want Creo Parametric to generate, to conduct the study. The Multi-Objective Design Study dialog box displays the results. The Table Tree section displays the Master Table. The record number, computed values of the design goals, and the corresponding values of the design variables appear in individual columns in the Table Data section for the Master Table.
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If you have selected the Define Increments box for the Automatic method of sampling or, if you have selected the Manual method of sampling, then Creo Parametric calculates the number of experiments and displays it in the message area.
10. To create a derived table, click Table > Derive. The Derive Table (MASTER_TABLE) dialog box opens.
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You cannot expand a master table that uses increments for its design variables or that has been created using the Manual method of sampling.
11. Select one of the following methods for deriving a table:
Constraints—Creates a derived table by setting the maximum and minimum values for the design goals. Select a parameter in the parameter list and specify new values in the Min and Max boxes or accept the default values.
Pareto—Creates a derived table by optimizing your design goals. Click on a cell under Options and set its value to Maximize, Minimize, or Exclude.
12. Type the table name and click OK. The Multi-Objective Design Study dialog box displays the results. The Table Tree section displays the derived table icon. The record number, computed values of the design goals, and the corresponding values of the design variables appear in individual columns in the Table Data section for the derived table.
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The number of experiments used for generating the records for the derived table is derived from the master table.
13. To create another derived table, click a table in the Table Tree section, click Table > Derive, and create a table from the parent derived table by selecting the Constraints or the Pareto method. Each derived table appears in the Table Tree section with an icon indicating its method of creation.
14. To save the study including the derived tables, click File > Save in the Multi-Objective Design Study dialog box.
15. Click File > Exit to end the study.