Simulink Control Design™ - MathWorks

When you create a tuning goal in Control System Tuner, a tuning-goal plot is generated.

The dotted line shows the gain profile you specify. The shaded area on the plot represents

the region in the frequency domain where the gain goal is not satisfied.

By default, Gain Goal constrains a closed-loop gain. To constrain a gain computed with

one or more loops open, specify loop-opening locations in the I/O Transfer Selection

section of the dialog box.

Creation

In the Tuning tab of Control System Tuner, select New Goal > Gain limits to create a

Gain Goal.

Command-Line Equivalent

When tuning control systems at the command line, use TuningGoal.Gain to specify a

maximum gain goal.

I/O Transfer Selection

Use this section of the dialog box to specify the inputs and outputs of the transfer

function that the tuning goal constrains. Also specify any locations at which to open loops

for evaluating the tuning goal.

• Specify input signals

Select one or more signal locations in your model as inputs to the transfer function

that the tuning goal constrains. To constrain a SISO response, select a single-valued

input signal. For example, to constrain the gain from a location named 'u' to a

location named 'y', click Add signal to list and select 'u'. To constrain the

largest singular value of a MIMO response, select multiple signals or a vector-valued

signal.

• Specify output signals

Select one or more signal locations in your model as outputs of the transfer function

that the tuning goal constrains. To constrain a SISO response, select a single-valued

output signal. For example, to constrain the gain from a location named 'u' to a

location named 'y', click Add signal to list and select 'y'. To constrain the

largest singular value of a MIMO response, select multiple signals or a vector-valued

signal.

10 Control System Tuning