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# Horrible Fourier Series Question! watch

1. Hi, I'm new to this forum and in DESPERATE need of help/guidance.

So there I was, minding my own business doing an engineering maths assignment when this happened... (see attached file)

I am not too bad at regular Fourier analysis but this came totally out of the blue and my algebra just isn't good enough. I've tried to include detailed descriptions of my workings so far and hope that someone can show me what I'm actually supposed to be doing!

So do I multiply VC/5tau by the (1/1+j omega n)? Even after that, how do I actually arrive at the Fourier series?

Supposing I somehow manage to do that, how do I then "model its phasor behaviour?" Also, do I need to do apply the same principles to the second curve and then plot the voltage and current phasors?

Sorry for all the questions, I'm only doing an HND but it's distance-learning and the college will not provide any lecture notes or guidance for this module.

Please help!!!

Thanks,

Jake
Attached Images
2. Fourier Problem.pdf (295.7 KB, 119 views)
3. (Original post by d0ctorworm)

Please help!!!

Thanks,

Jake
hi sorry you have not had much help apart from that bot thing.

i did find an error on the 3rd line of page 2 of your pdf.

it should say ( 1 + CRjwn) underneath, not ( 1 + wn )

unfortunately i cannot help beyond there

good luck

bear
4. Dear doctorworm,

I would not make a much promise to see it right but, the time period 5*tau must be the period of fourier series.

Now, for this fourier period; what we actually assume is w=2*pi/(time), in your case time=5*tau.
This leaves sine function to yield zero and cosine to give 1 accordingly as 2*pi is for even fuction for cosine.

I don't get much idea about the period of this function. if the period is half than my imagination it would be n*pi only, in which case value of cosine keeps osciallting between 0 and -1.

And don't forget bear's suggestions!!

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