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Topic: problems on derivation of sampled signal
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pietro

Posts: 374
Registered: 1/3/09
problems on derivation of sampled signal
Posted: Nov 23, 2012 5:44 AM
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Hi all,

I have a displacement signal and I have to get the acceleration from it. I used several method to get the displacement, but all of them fail somehow.
Here you can see the signal:
http://imageshack.us/f/89/signalgn.jpg/

I used:
1- the formula: diff(disp,2)./(run(i).t(2)).^2; The signal magnitude is too high
2- the spectral differentiation through the derivation property of Fourier transform. Here again, I get high signal magnitude. Method 1 matches with method 2
3- I used the simulink derivation block. The signal looks reasonable.

Why is there this difference beeween methods 1 and 2 with method 3. How could I implement method 3 through a script, without creating a simulink model?

thanks

Best regards

Pietro





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