Fourier Series
Fourier Series
(OP)
Hi - Can any anyone help me graph the 1st harmonic. Please see attached data.
Thanks,
Thanks,
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RE: Fourier Series
OK, first thing to do is to interpolate the data so that you have 64 samples, not 36
Then you need to install the data analysis add-in
then you need to use the Fourier Analysis in that menu.
Then you need the magnitude, use imabs
Then you need to read up on the scale factor used in Fourier.
Eyeballing I'd expect an amplitude of somewhat less than 3 mm for the first order component, and get 2.24 mm
Cheers
Greg Locock
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RE: Fourier Series
RE: Fourier Series
See attached file.
Thanks a lot.
Thomas
RE: Fourier Series
Cheers
Greg Locock
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Fourier Series
If you've done it right you have calculated the amplitude of the sine and cosine parts of the first order, so now generate a sine wave and multiply it by a, and a cos wave and mutliply it by b, and add them up, and that should be the first order component.
You've got a - sign problem in b,
the correct formula is 0.34*cos(x)-1.83*sin(x), and it looks OK
I don't know where I got 2.24 before, that is wrong.
Cheers
Greg Locock
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RE: Fourier Series
TC
RE: Fourier Series
Regards
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RE: Fourier Series
RE: Fourier Series
Greg - thank you once again.
RE: Fourier Series
Thank GregLocock
for this valuable post!
RE: Fourier Series