- ωi is the ith frequency specified in the Frequencies parameter (in rad/s).
- Nfreq is the number of frequencies in Frequencies.
- Nset,i is the corresponding value of the Number of settling periods parameter.
- Nestim,i is the corresponding value of the Number of estimation periods
parameter. - Ts is the experiment sampling time, specified by the Sample time (Ts) parameter.
- When Experiment mode is Superposition, the recommended experiment length is
six times the longest period. If your system does not require much time for the decay
of transients or for the averaging away of noise, then you can use a shorter
experiment length. For more information about how to determine experiment length in
superposition mode, see “Experiment Length and Data-Collection Window in
Superposition Mode” on page 16-101.
Avoid any load disturbance to the plant during the experiment. Load disturbance can
distort the plant output and reduce the accuracy of the frequency-response estimation.
Data Types: single | double
w — Frequencies for estimation experiment
vector
Supply a value for the Frequencies parameter. See that parameter for information about
how to choose frequencies.
When you supply frequencies via this port, specify the number of frequencies with the
Number of frequencies in the excitation signal parameter.
Dependencies
To enable this port, in Excitation Signal Source, select External ports.
Data Types: single | double
amp — Perturbation amplitudes
scalar | vector
Supply a value for the Amplitudes parameter. See that parameter for details.
Dependencies
To enable this port, in Excitation Signal Source, select External Ports.
Data Types: single | double
Frequency Response Estimator