How to correct resonance phase plot

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Derek Cooper 2021-11-5

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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 2021-11-5

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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 2021-11-5

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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)

Derek Cooper 2021-11-8

Now it worked, thank you very much.

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