Simulink Control Design™ - MathWorks

Speed Up Frequency Response Estimation Using Parallel

Computing

This example illustrates how to speed up frequency response estimation of Simulink®

models using parallel computing. In some scenarios, the frestimate function estimates

the frequency response of a Simulink model by performing multiple Simulink simulations.

You can distribute these simulations to a pool of MATLAB workers by using Parallel

Computing Toolbox™.

This example requires Parallel Computing Toolbox. You can optionally run simulations on

a computer cluster using MATLAB® Parallel Server™. This example uses the local worker

functionality available in Parallel Computing Toolbox.

Speed up Simulink Simulations Performed by frestimate

When you compute a frequency response using the frestimate function, the majority of

computation time is usually spent in Simulink simulations. To reduce the total simulation

time, you can:

(^1) Use rapid accelerator mode. Use this method when frestimate performs only one
Simulink simulation. For an example, see “Linearization Validation in Frequency
Domain Using FRESTIMATE” on page 5-96.
(^2) Distribute simulations across workers in a MATLAB pool. Use this method when
frestimate performs multiple Simulink simulations. frestimate performs more
than one Simulink simulation when you specify the following:

• A sinestream input signal with the SimulationOrder parameter set to
  'OneAtATime'. In this case, each frequency in the sinestream signal is simulated
  separately.


• Linear analysis points with more than one input point or a nonscalar input point. In
  this case, each linearization input point or each channel in a nonscalar linearization
  input point yields a separate Simulink simulation.

Using the frestimate function with parallel computing also supports normal,

accelerator, and rapid accelerator modes.

Configure a MATLAB Pool

To use parallel computing to speed up frequency response estimation, configure and start

a pool of MATLAB workers before you run the frestimate function.

5 Frequency Response Estimation