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You might use the general FFT method in system identification:

At least you can start with this:

1. Calculate the FFT of your output (the step response plot)
2. You know what the FFT of your input (the heaviside function) is: 1/2*pi*f
3. devide the first by the second and end up eith the calculated transfer function.
4. Plot the Bode plot (magnitude and phase / frequency)
5. Fit it with a transfer function that you know and has second order characteristics. A system with two poles with or without a zero. stuff like that

Good luck!

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15y ago

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