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Homework Help: Fourier Analysis

  1. Oct 6, 2011 #1
    All, I'm having some problems with a fourier analysis im doing as a coursework, we have been given waves with multiple functions to try and work out the harmonics of them.
    My three functions are:
    f1 = -5sin (2*pi*t) - sin wave part
    f2 = 21.74t-32.61 - straight line part
    f3 = 0 - horizontal straight line part

    I have worked out A0 using MATLAB and then manually to check the answer.

    My problem is that I need to pick a certain harmonic to work out manually to check the MATLAB answer with, i picked the 2nd harmonic.

    To work out A2 i get the equations:

    1/pi (-5sin(2*pi*t)cos(4*pi*t)) when 0.73 < t < 1.27
    1/pi (21.74t*cos(4*pi*t)-32.61cos(4*pi*t)) when 1.27 < t < 1.5

    Can anyone help with what im supposed to do next?
  2. jcsd
  3. Oct 8, 2011 #2

    rude man

    User Avatar
    Homework Helper
    Gold Member

    Is your total wave f1*f2*f3? If so, do f2 and f3 repeat every period (= 1.0s)?
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