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why simulink has noise while ode45 dose not?

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hossein
hossein on 23 May 2020
Commented: hossein on 24 May 2020
Hi friends
I have developed a code based on ode45 and a similar simulink. the similink scope shows some noise in the results while ode45 does not. why is there this difference and how can I eleminate the noise from the scope in simulink?
I have attached the figures

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Accepted Answer

rubindan
rubindan on 23 May 2020
Without code or Simulink model it is hard to tell what is exacly the reason. In case that the noise is numeric and should not be there, you probably need to change the solver settings in Simulink (Simhlintaion-->Model Cofigureation Parameters->Solver). Try, for e.g., reducing the tolerance.

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hossein
hossein on 24 May 2020
thanks for the advice, actully reducing max and min of the step size solve the problem, while reducing the tolerance occures an error of singularity.
thanks alot dud.

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