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Specify Design Variables

Before running the optimization, you must define the model parameters to optimize. These parameters form the design variables set for optimization. By tuning these parameters, Simulink® Design Optimization™ software attempts to make the signals meet the requirements.

Simulink Design Optimization software optimizes the response signals of the model by varying the tuned parameters so that the response signals lie within the constraint bound segments or closely match a specified reference signal. The design variables can be scalar, vector, matrix, or an expression that evaluates to one of these values.

To specify the parameters to be tuned using the Design Optimization tool:

  1. In the Design Variables Set list, select New.

    A window opens where you specify design variables. All model parameters are displayed in this window.

  2. Select one or more parameter names and click

    to add the selected parameters to a design variables set.

      Note:   You can add the same parameter to multiple design variable sets.

  3. (Optional) Specify design variable settings.

    SettingDescriptionDefault

    Variable

    The name of the parameter.

    Not an editable field

    Value

    Value of the model parameter. This value is used by the optimization method as the initial value and is modified during optimization.

    Current value of the parameter in the model. If you edit this column, click Update model variable values to update the values in the model.

    Minimum

    The minimum value or lower bound for the parameter. You can edit this field to provide an alternate minimum value.

    -Inf

    Maximum

    The maximum value or upper bound for the parameter. You can edit this field to provide an alternate maximum value.

    Inf

    Scale

    During optimization, the design variables are scaled, or normalized, by dividing their current value by a scale value. You can edit this field to provide an alternate scaling factor.

    Next power of 2 greater than the current value of the parameter

    The check-box indicates whether the parameter is selected as an design variable in the set. Select it if you want this parameter to be tuned during the optimization. Deselect if you do not want this parameter to be tuned during the optimization but you would like to keep it on the list of tuned parameters (for a subsequent optimization).

    Expand Variable Detail to see the block in the model that contains this parameter.

  4. Click OK to create a design variable set.

Related Examples

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