On Monday, May 12, 2014 8:28:11 PM UTC+12, Muhammad Irfan Zafar wrote: > Hi. > > > > 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. > > > > 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. > > > > I think it's right. Can anybody write another way to counter check that? > > > > Thanks
All bets are off with Fourier transforms when you are dealing with a nonlinear system.