Process Model Structure Specification
In the System Identification app, specify the model structure by selecting the number of real or complex poles, and whether to include a zero, delay, and integrator. The resulting transfer function is displayed in the Process Models dialog box.
At the command line, specify the model structure using an acronym that includes the following letters and numbers:
Pfor a process model
3for the number of poles
Dto include a time-delay term
Zto include a process zero (numerator term)
Uto indicate possible complex-valued (underdamped) poles
Ito indicate enforced integration
Typically, you specify the model-structure acronym as an argument
in the estimation command
procest(data,'P1D')to estimate the following structure:
procest(data,'P2ZU')to estimate the following structure:
procest(data,'P0ID')to estimate the following structure:
procest(data,'P3Z')to estimate the following structure:
For more information about estimating models, see Estimate Process Models at the Command Line.