Transfer function in Simulink different from Matlab
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Hey everybody,
I am plotting the step response of a transfer function with matlab and the result is fine.
Gs = (1/s^2) * (1 - 2*exp(-s*0.5) + exp(-s))
Now I am trying to build this function in Simulink with standard blocks, but the step response is different from matlab:
and
I have tried many different solver settings but the result is always the same. I anyone has Ideas what might be the problem, please let me know.
Thanks in advance,
Daniel.
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Pedro Villena
le 21 Nov 2012
Modifié(e) : Pedro Villena
le 21 Nov 2012
Gs = (1/s^2) * (1 - 2*exp(-s*0.5) + exp(-s))
Gs = 1/s^2 - (2/s^2)*exp(-s*0.5) + (1/s^2)*exp(-s)
![](https://www.mathworks.com/matlabcentral/images/broken_image.png)
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Ryan G
le 20 Nov 2012
The easiest way to achieve the desired results would be with the LTI System block which comes with the Control System Toolbox. This allows you to create a system in MATALB and directly utilize it in Simulink.
However, your model as shown works. You need to adjust the relative tolerance in the configuration parameters to be tighter. Try 1e-6 or 1e-8 and check the results.
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