Simulink Control Design™ - MathWorks

Creation

In the Tuning tab of Control System Tuner, select New Goal > Minimum stability

margins to create a Margins Goal.

Command-Line Equivalent

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

a stability margin goal.

Feedback Loop Selection

Use this section of the dialog box to specify the signal locations at which to measure

stability margins. You can also specify additional loop-opening locations for evaluating the

tuning goal.

• Measure stability margins at the following locations

Select one or more signal locations in your model at which to compute and constrain

the stability margins. To constrain a SISO loop, select a single-valued location. For

example, to constrain the stability margins at a location named 'y', click Add

signal to list and select 'y'. To constrain a MIMO loop, select multiple signals or a

vector-valued signal.

• Measure stability margins with the following loops open

Select one or more signal locations in your model at which to open a feedback loop for

the purpose of evaluating this tuning goal. The tuning goal is evaluated against the

open-loop configuration created by opening feedback loops at the locations you

identify. For example, to evaluate the tuning goal with an opening at a location named

'x', click Add signal to list and select 'x'.

TipTo highlight any selected signal in the Simulink model, click. To remove a signal

from the input or output list, click. When you have selected multiple signals, you can

reorder them using and. For more information on how to specify signal locations

for a tuning goal, see “Specify Goals for Interactive Tuning” on page 10-39.

10 Control System Tuning