Simulink Control Design™ - MathWorks

Examine Estimation Results Using Simulation Results Viewer

The Simulation Results Viewer lets you examine the results of frequency response

estimation frequency by frequency. You open the viewer using the frest.simView

command. To do so, store the simulation data using the simout output argument of

frestimate.

Estimate the open-loop response of the plant in the watertank model. First, open the

model.

model = 'watertank';

open_system(model);

Define a linearization I/O set that specifies the plant, and find a steady-state operating

point for estimation.

io(1)=linio('watertank/PID Controller',1,'input');

io(2)=linio('watertank/Water-Tank System',1,'openoutput');

watertank_spec = operspec(model);

opOpts = findopOptions('DisplayReport','off');

op = findop(model,watertank_spec,opOpts);

Then, create an input signal for estimation, and estimate the frequency response of the

specified portion of the model. Use the simout output argument to store the estimation

data.

input = frest.Sinestream('Frequency',logspace(-3,2,10));

[sysest,simout] = frestimate(model,op,io,input);

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