As an alternative to the closed-loop configurations shown above, you can use the block in
an open-loop plant, typically using a constant input signal u to drive the plant to the
desired operating point. It is a good practice to use the closed-loop configuration,
particularly for real-time estimation. In a closed-loop configuration, the controller works
to suppress the injected disturbance and maintain safe plant operation.Estimation Workflow
The general workflow for online frequency response estimation is as follows.(^1) Incorporate the Frequency Response Estimator block into your system in one of the
configurations described above.
(^2) Configure the start/stop signal that controls when the estimation experiment begins
and ends. You can use this signal to initiate the experiment at any time.
(^3) Configure experiment parameters such as the frequencies at which to estimate the
response and the amplitudes of the injected perturbations.
(^4) Start the experiment using the start/stop signal, and allow it to run long enough for
the estimation process, based on the experiment length recommended by the block.
5 Stop the experiment and examine the estimated frequency response.
For detailed information on performing each of these steps, see:
6 Online Frequency Response Estimation