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Using FFT, how to extract the original spring constant and viscous constant?

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Nina
Nina 2012-10-9
Hello all, I modeled a Forced damped harmonic oscillator with a specific spring constant k and viscous constant c. After I model it in matlab and apply fft to it, is there a way to extract them back? I am trying to figure out the error while varying k and c after applying fft. Thank you

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