How to correct resonance phase plot

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Derek Cooper
Derek Cooper 2021-11-5
评论： Derek Cooper 2021-11-8
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),

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Bjorn Gustavsson
Bjorn Gustavsson 2021-11-5
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
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Bjorn Gustavsson
Bjorn Gustavsson 2021-11-5
Chek the size of your alfa-variable. From the help of unwrap you see that it unwraps along the first (non-singleton) dimension, and you would most likely want the unwrapping along the second dimension:
plot(r,180/pi*unwrap(2*alfa,[],2)/2)

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