Simulink Control Design™ - MathWorks

Sinestream Input with Specified Number of Samples

When your sinestream signal covers a wide range of frequencies, it can be inefficient to

use the same sample time across all frequencies. For that reason, frest.Sinestream by

default uses a fixed number of samples at each frequency. You can specify that number

with a scalar value, or use a vector to provide a different number of samples at each

frequency. (To create a sinestream signal with a fixed sample time across the entire

signal, use frest.createFixedTsSinestream. This option is useful when the input

linearization point for estimation is on a discrete-time signal.)

Create a sinusoidal input signal with the following characteristics:

• 50 frequencies spaced logarithmically between 10 Hz and 1000 Hz


• Amplitude of 1e-3 at all frequencies


• Sampled with a frequency 10 times the frequency of the signal (meaning ten samples
  per period)

input = frest.Sinestream('Amplitude',1e-3,...

'Frequency',logspace(1,3,50),...

'SamplesPerPeriod',10,...

'FreqUnits','Hz');

Sinestream Signal Based on Linearized Dynamics

Create a sinestream input signal based on the dynamics of a linear system. This approach

is useful when you are using frequency response estimation to validate the linearization of

your model.

Open a Simulink model.

model = 'watertank';

open_system(model)

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