Simulink Control Design™ - MathWorks

tfinal = getSimulationTime(input)

where input is the input signal. The simulation stop time, tfinal, serves as an indicator

of the frequency response estimation duration.

You can reduce the simulation time by modifying your signal properties.

Input Signal Action Caution

Sinestream Decrease the number of periods

per frequency, NumPeriods,

especially at lower frequencies.

You model must be at steady state

to achieve accurate frequency

response estimation. Reducing the

number of periods might not excite

your model long enough to reach

steady state.

Chirp Decrease the signal sample time,

Ts, or the number of samples,

NumSamples.

The frequency resolution of the

estimated response depends on the

number of samples NumSamples.

Decreasing the number of samples

decreases the frequency resolution

of the estimated frequency

response.

For information about modifying input signals, see “Modify Estimation Input Signals” on

page 5-46.

Specifying Accelerator Mode

You can try to speed up frequency response estimation by specifying the Rapid

Accelerator or Accelerator mode in Simulink.

For more information, see “What Is Acceleration?” (Simulink).

Using Parallel Computing

You can try to speed up frequency response estimation using parallel computing in the

following situations:

• Your model has multiple inputs.


• Your single-input model uses a sinestream input signal, where the sinestream
  SimulationOrder property has the value 'OneAtATime'.

5 Frequency Response Estimation