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Simulink scope giving out "noisy" output

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ariel bintang
ariel bintang 2019-5-28
评论： Arvind Sathyanarayanan 2019-5-31
So I have a simulink model that gives output of error signal fed back to a PID controller. The problem is that its very "noisy" (as can be seen below); whereas it is supposed to be flat (as shown in the 2nd picture). I can see that the shape of the noisy response is overall similar to the correct one; its just the noisy oscillations that make them different. Does anyone know why? I have chosen a stiff ode solver but this problem keeps persisting.aekx5ucub0131.png
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Raj
Raj 2019-5-29
You have not attached any 2nd picture. Did you try adjusting the tolerances?
Arvind Sathyanarayanan
Arvind Sathyanarayanan 2019-5-31
Ariel, attaching the model will help us answer the question better.
Are your reference and feedback signals noise free? Have you tried playing with your PID gains?

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