How to correct resonance phase plot

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Hello,
I am trying to implement the resonance response at different damping ratios. I dont know why the phase plot looks like this
In litteratures, it is supposed to look like this, (Shifted),

Accepted Answer

Bjorn Gustavsson
Bjorn Gustavsson on 5 Nov 2021
You could quick-fix this by plotting the phase-angle phi like:
plot(unwrap(2*phi)/2)
But you might have to check that you calculate the phase-angle correctly (right sign relative to the driving force and whatnot...)
HTH
  7 Comments
Derek Cooper
Derek Cooper on 8 Nov 2021
Now it worked, thank you very much.

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