From Acceleration to Displacement Trapz Function

Ali
2014 5 23
2 个回答
更新时间：2014 5 23
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Hello,
I have the acceleration values as a vector and I need to integrate it to get velocity and displacement via Trapz function. trapz(acc) gives a value for V but how can i reach to the displacement value? Is there any way to integrate 2 times ? When i integrate V value it naturally gives me zero.
Thank you.

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回答（2 个）

Mahdi
Mahdi 2014-5-23

0 个投票

Consider using the cumtrapz function to find the displacement.
% Defined Acceleration values as Accel, Time is the steps of time
velocity=cumtrapz(Time, Acceleration)
Displacement=cumtrapz(Time, Velocity)
Or you can use the combination of cumtrapz and trapz to fit which solution you want.

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Ali
Ali 2014-5-23
Thank you for answering !
I have my values tabulated but i dont have the exact function. They are just random values. First integration with trapz (V=trapz(time,acc)) gives me one single value as result. So it's a constant one value. When I integrate it for the second time (disp=trapz(V)) It results zero.
Mahdi
Mahdi 2014-5-23
Yeah, that's why I'm suggesting to use the cumtrapz function because it would give you velocities. Have a look at this link.

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Ali
Ali 2014-5-23
编辑：Ali 2014-5-23

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I did something hope it makes sense.
I have 485 values for each planes.(x,y,z) That one i wrote just for X values.
I seperated the values into 10 values group and got the trapz value for each interval of 10.
I ignored some of the values.(Like i have 485 but worked on 481 values)
Then I got 48 different Vx values.
Same process for the Ux(displacement) values.
This time each interval includes 5 values.
I hope its right.
for t=0:47;
accx=data((10*t+1):(10*t+11),1);
time=(t+1):(11+t);
Vx(t+1)=trapz(time,accx);
end
plot(Vx,'*');
for n=0:8;
Vxx=Vx(1,((5*n+1):(5*n+6)));
time2=(n+1):(6+n);
Ux(n+1)=trapz(time2,Vxx);
end
plot(Ux,'o');

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Ali
Ali
2014-5-23

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Ali
Ali
2014-5-23

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