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Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: FFT & Phase determination
Replies: 1   Last Post: May 12, 2014 5:53 AM

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Derek Goring

Posts: 3,919
Registered: 12/7/04
Re: FFT & Phase determination
Posted: May 12, 2014 5:53 AM
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On Monday, May 12, 2014 8:28:11 PM UTC+12, Muhammad Irfan Zafar wrote:
> Hi.
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> I was trying to find frequency content and corresponding phase angle for a response from a nonlinear system to a sinusoidal input. I have to insert these values in Fourier series to find a suitable output expression.
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> End results aren't very good so i was wondering if i am making any mistakes in calculating phase angle. Frequency of the nonlinear response stays the same as of input. To calculate the phase angle, i used the index value of corresponding frequency in the fft plot and found the value of phase at that index in phase plot.
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> I think it's right. Can anybody write another way to counter check that?
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> Thanks


All bets are off with Fourier transforms when you are dealing with a nonlinear system.



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