My Math Forum Waveform

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 March 2nd, 2019, 06:56 AM #1 Member   Joined: Feb 2018 From: England Posts: 61 Thanks: 0 Waveform Hi All, Have been trying to simulate the following waveform but struggling to work out what waveform it approx. represents? 0.91sin (2∏ x 100t) + 0.31 sin (2∏ x 300t) + 0.19 sin (2∏ x 500t) + 0.14 sin (2∏ x 700t) + 0.04 sin (2∏ x 900t) Thanks for any guidance.
March 2nd, 2019, 07:53 AM   #2
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Quote:
 Originally Posted by NAC54321 Hi All, Have been trying to simulate the following waveform but struggling to work out what waveform it approx. represents? 0.91sin (2∏ x 100t) + 0.31 sin (2∏ x 300t) + 0.19 sin (2∏ x 500t) + 0.14 sin (2∏ x 700t) + 0.04 sin (2∏ x 900t) Thanks for any guidance.
It looks like the start of a Fourier Sine series but I have no idea how to find the function it is supposedly representing.

-Dan

 March 2nd, 2019, 10:49 AM #3 Senior Member     Joined: Sep 2015 From: USA Posts: 2,468 Thanks: 1342 It's 5 terms into being a square wave. The amplitude is about 1.4.. it's probably intended to be $\sqrt{2}$ Thanks from topsquark and NAC54321 Last edited by romsek; March 2nd, 2019 at 10:53 AM.
 March 3rd, 2019, 11:34 PM #4 Senior Member   Joined: Apr 2014 From: UK Posts: 921 Thanks: 331 And a frequency of 100Hz Thanks from topsquark

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