numeric integration of datapoints

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Mos_bad
Mos_bad 2019-5-26
评论： Walter Roberson 2019-5-26
I have time (dt) acceleration (Acc) data points. I need to plot velocity (vel) and displacement (disp) vs time and also calculate peak velocity (V_max) and peak displacement (d_max). I have used "cumtrapz" to do so as below:
vel=cumtrapz (dt,Acc); % velocity
disp=cumtrapz(dt,vel); % displacement
v_max=max(vel);
d_max=max(disp);
However, the peak velocity and displacement are not accurate. Is there a way to approximate them more accurately?
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Mos_bad
Mos_bad 2019-5-26
Because the data are ground motions and downloaded from USGS I have peak values of some. they do not match. I am not sure if fft helps or not.
Walter Roberson
Walter Roberson 2019-5-26
trapazoid rule is about the best numeric integration you can get when you do not have a model function. Earthquake movement studies have developed some model functions, and so can improve on trapazoid rule in some cases.

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