Simulink Control Design™ - MathWorks

Options

Use this section of the dialog box to specify additional characteristics of the step rejection
goal.

• Adjust for amplitude of input signals and Adjust for amplitude of output
  signals

For a MIMO tuning goal, when the choice of units results in a mix of small and large

signals in different channels of the response, this option allows you to specify the

relative amplitude of each entry in the vector-valued signals. This information is used

to scale the off-diagonal terms in the transfer function from the tuning goal inputs to

outputs. This scaling ensures that cross-couplings are measured relative to the

amplitude of each reference signal.

When these options are set to No, the closed-loop transfer function being constrained

is not scaled for relative signal amplitudes. When the choice of units results in a mix of

small and large signals, using an unscaled transfer function can lead to poor tuning

results. Set the option to Yes to provide the relative amplitudes of the input signals

and output signals of your transfer function.

For example, suppose the tuning goal constrains a 2-input, 2-output transfer function.

Suppose further that second input signal to the transfer function tends to be about

100 times greater than the first signal. In that case, select Yes and enter [1,100] in

the Amplitudes of input signals text box.

Adjusting signal amplitude causes the tuning goal to be evaluated on the scaled

transfer function Do–1T(s)Di, where T(s) is the unscaled transfer function. Do and Di are

diagonal matrices with the Amplitudes of output signals and Amplitudes of input

signals values on the diagonal, respectively.

The default value, No, means no scaling is applied.

• Apply goal to

Use this option when tuning multiple models at once, such as an array of models

obtained by linearizing a Simulink model at different operating points or block-

parameter values. By default, active tuning goals are enforced for all models. To

enforce a tuning requirement for a subset of models in an array, select Only Models.

Then, enter the array indices of the models for which the goal is enforced. For

example, suppose you want to apply the tuning goal to the second, third, and fourth

Step Rejection Goal