Identifying harmonics

Discussion in 'Homework Help' started by garaldpkr, Jan 27, 2011.

  1. garaldpkr

    Thread Starter New Member

    Jan 27, 2011
    1
    0
    v = 100sin ώt + 20 sin (3ώt + 450) + 5 sin (5ώt - 300) Volts

    I have this question which is totally puzzling me, its asking me to identify the harmonics present in the voltage if ω = 314 rad s-1???


    Is there any one out there who can be of assistance???
     
  2. someonesdad

    Senior Member

    Jul 7, 2009
    1,585
    141
    If you don't know the answer to this, you need to find out what the word "harmonic" means.

    You could also use a quickie python script to plot this function (needs numpy and matplotlib):

    from pylab import *
    w, N, tmax = 314, 1000, 100.0
    t = arange(0, tmax, tmax/N)
    y = 100*sin(w*t) + 20*sin(3*w*t + 450) + 5*sin(5*w*t - 300)
    plot(t, y)
    show()

    Then it's one more line to plot the FFT -- and that should answer your question if you're not able to answer it from looking at the function. :p
     
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