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How do i calculate damping ratio using a half power method

Asked by ben aveyard on 21 Nov 2019 at 16:14
Latest activity Answered by Nishant Gupta on 27 Nov 2019 at 6:12
I am trying to get damping ratio from a Frequency response plot.
I have used a peakfind to get the peaks and return the natural frequewncies and have plotted the half power line onto my original frf plot but cannot get the band width where the lines intersect. i have tried polyfit and interpl but these are not working.
Thanks

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1 Answer

Answer by Nishant Gupta on 27 Nov 2019 at 6:12

You can refer to the following case to calculate the -3 dB intercept and hence can calculate the bandwidth:

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