Simulink Control Design™ - MathWorks

Validate Tuned Control System

When you tune a control system using systune or Control System Tuner, you must

validate the results of tuning. The tuning results provide numeric and graphical

indications of how well your tuning goals are satisfied. (See “Interpret Numeric Tuning

Results” on page 10-182 and “Visualize Tuning Goals” on page 10-187.) Often, you want

to examine other system responses using the tuned controller parameters. If you are

tuning a Simulink model, you must also validate the tuned controller against the full

nonlinear system. At the command line and in Control System Tuner, there are several

tools to help you validate the tuned control system.

Extract and Plot System Responses

In addition to the system responses corresponding to your tuning goals (see “Visualize

Tuning Goals” on page 10-187), you can evaluate the tuned system performance by

plotting other system responses. For instance, evaluate reference tracking or overshoot

performance by plotting the step response of transfer function from the reference input to

the controlled output. Or, evaluate stability margins by examining an open-loop transfer

function. You can extract any transfer function you need for analysis from the tuned

model of your control system.

Extract System Responses at the Command Line

The tuning tools include analysis functions that let you extract responses from your tuned

control system.

For generalized state-space (genss) models, use:

• getIOTransfer


• getLoopTransfer


• getSensitivity


• getCompSensitivity

For an slTuner interface, use:

• getIOTransfer (for slTuner)


• getLoopTransfer (for slTuner)


• getSensitivity (for slTuner)

Validate Tuned Control System