Converting velocity, time, and force data into acceleration

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Anthony
Anthony 2014-1-6
编辑： Youssef Khmou 2014-1-7
Hello, I am working on a project and am running into a problem converting velocity data into acceleration data. I have velocity data from an ADV as well as force data from a ring transducer on a pile in a wave tank experiment. What would be the easiest way to obtain acceleration data to use in later codes (to obtain drag and inertia coefficients). Thank you.

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回答（2 个）

Laurent
Laurent 2014-1-6
Assuming that you have a time series of velocity values, you could just calculate the derivative of the velocity by using the command 'diff' and then dividing by the time difference between adjacent velocity values. Is this what you need?
Youssef Khmou
Youssef Khmou 2014-1-6
Like Laurent said, a=diff(v)./diff(t), you compare that result with F/m with m being the mass of the considered system,
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Youssef Khmou
Youssef Khmou 2014-1-7
编辑：Youssef Khmou 2014-1-7
i never used gradient for velocity, but for 2D fields. i think diff is standard, while gradient needs to adjust the step h to be the same as Ts=1/Fs, as in this demo :
t=0:0.01:10;
v=2*t;
a1=diff(v)./diff(t);
a1(end+1)=a1(end);
a2=gradient(v,0.01);
plot(t,a1,t,a2,'r')
legend('diff(v(t))','\nabla v(t)');
if Ts is not known, its not convenient to use grad, !?

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