Optimize - Sensitivity Analysis

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Sensitivity Analysis

Page Contents

Description

The Sensitivity Analysis is a basic tolerancing feature which allows determination of the sensitivity of the merit function on each optimization variable. For the threshold value selected, each variable is iterated independently until the merit function (or its square root) achieves the threshold value. A report of the sensitivity analysis results is printed to the output window, providing the following details:

•Starting sensitivity function value

•Sensitivity function threshold value

•Threshold value as a percentage above the starting sensitivity function value

•Number of active variables

•Number of active merit function aberrations

•For each active variable:

- Nominal value

- Lower and upper value limits

- Value span

Navigation

This feature can be accessed by selecting Optimization > Sensitivity Analysis from the menu.

Controls

Control	Inputs / Description	Default
Sensitivity Function Threshold Value
Set to	Option 1: % higher than starting value This option sets the sensitivity function threshold value as a percentage above the nominal (starting) value. Option 2: Explicit value This option sets the sensitivity function threshold value explicitly. If the nominal starting value is X, then setting the sensitivity function value explicitly to 1.1*X would be equivalent to setting the value 10% above nominal.	10% higher than starting value
Sensitivity Function Definition
Option 1: Merit Function Value This option designates the sensitivity function value to be equivalent to the merit function value as computed internally by FRED. Option 2: Square root of merit function value This option designates the sensitivity function value to be equivalent to the square root of the merit function value.		Merit Function Value

OK	Accept settings and close dialog.
Cancel	Discard settings and close dialog.