How can I fit data with only one sine wave?

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Luka
Luka 2014-3-24
评论： Luka 2014-3-25
Hello!
I have measurements of gear tooth error from 0° to 360°. Error data contain eccentricity of measured gear and errors of tooth shape (similar as signal and noise).
Eccentricity is a single sine wave regression of measured data. I want to subtract eccentricity from total error (get only "noise"), but I can not get only one fitted sine wave of the data. The "sin1" and "fourier1" regressions return one or more sine waves, depends on measured data.
Thank you in advance!
Luka

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回答（1 个）

Walter Roberson
Walter Roberson 2014-3-24
fft() and extract the bin with the highest magnitude, perhaps ?
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Luka
Luka 2014-3-25
Thank you for fast response!
I do not know the background of FFT so well. Should I use fft() to get periodogram and then see which frequency components my data contain? What do you mean by extracting the bin? And how can I determine the magnitude to get exactly one sine wave?

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