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Nonlinear plant in simulink

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Ömer Ergün
Ömer Ergün on 14 Apr 2023
Commented: Walter Roberson on 14 Apr 2023
I need to model a nonlinear equation in simulink as below:
I think I need to use s-function block, in order to do that I need to code that equation as a function in .m file?

Answers (1)

Andy Bartlett
Andy Bartlett on 14 Apr 2023
The key is to model Y(k+1) to Y(k) using a unit delay.
The output of the unit delay is the input value from one time step early.
Input Output
Y(k+1) Y(k)
then just wire-up the math around that.
  2 Comments
Ömer Ergün
Ömer Ergün on 14 Apr 2023
Edited: Ömer Ergün on 14 Apr 2023
Thanks for the tip, and where should I wire-up the math equation, in matlab fcn block or in mscript or can I just made a model with fundamental simulink blocks ...?
For example I generated this model, is it true?
(u is the signal comes from PID and the y is the output feedback)
Walter Roberson
Walter Roberson on 14 Apr 2023
There is no point having the 1/z in two different places. You should have it only once and split back the signal after the 1/z
I am not sure that you should be mux'ing the two values; I think you should probably be having the u(i) and 1/z flowing directly into the mathematics block as separate inputs.

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