Simulink Control Design™ - MathWorks

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);

Open the Simulation Results Viewer.

frest.simView(simout,input,sysest)

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