MATLAB: Velocity from accelerometer using numerical intergration

accelerometerfunctionintergrationtrap:velocity

I have a problem I have a trace from an accelerometer and I want to convert this into velocity I do not major in physics and I was wondering if there is a function on the mathworks forum to help me do this. I am a little confused on how to go about this. I know that my trace is from a tri-axial accelerometer and The participants put the sensors on after some minutes they then twisted 3 times to mark the start of their protocol. I would like to use the trap method if possible. Any help would be greatly appreciated

Best Answer

Bran, To make the question clear, you have to describe the nature( dimensions) of the acquired signal, and the sampling frequency. However let us make this simple simulation : dropping a simple object and storing the signal for 2 seconds, with sampling frequency Fs=1000Hz :
 t=0:1e-3:2-1e-3;
 a=0.5*9.81*t.^2; % the stored signal which is naturally the acceleration due to gravity .
You integrate this quantity :
v=integral(a,1e-2); % with 1e-2 as step .
figure, plot(t,a,t,v,'r'), legend(' Acceleration','Velocity');
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