Simulink Control Design™ - MathWorks

An alternative way to obtain a linear plant model is to directly estimate the frequency

response data from the Simulink model, create an frd system in the MATLAB workspace,

and import it back to PID Tuner to continue PID design.

Obtain Estimated Frequency Response Data Using Sinestream Signals

The sinestream input signal is the most reliable input signal for estimating an accurate

frequency response of a Simulink model using the frestimate function. For more

information on how to use frestimate, see “Frequency Response Estimation Using

Simulation-Based Techniques”.

7 PID Controller Tuning