Nonlinear plant in simulink
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I need to model a nonlinear equation in simulink as below:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1356408/image.png)
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?
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Andy Bartlett
2023-4-14
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.
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Walter Roberson
2023-4-14
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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