1. ## Fourier Analysis

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?
Thanks

2. ## Re: Fourier Analysis

Originally Posted by gaz1984
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?
Thanks
Please correct your original post so that we are not left guessing what the question is.

For instance indicate that you have a single piecewise defined function with the break points indicated.

CB