problem geting velocity and acceleration

Felipe Vial

2018 10 15

0 个回答

4 次查看（30 天）

0 个投票

data.mat

I have have a vector expressing position at 1 kHz and want to extract velocity and acceleration.

This is how I am doing it:

vel = diff(data)
acc = diff(data,2)

and this is what I am getting

How can I get a more useful estimation of velocity and ACC ? I have tried downplaying the data,but it doesn't help much.

Attached is the vector

Thanks

2 个评论
显示无隐藏无

Bob Thompson 2018-10-15

What defines a 'useful estimation'? Your plots are very cluttered, but not incorrect, as you have effectively taken the first and second derivatives of position, which are velocity and acceleration respectively.

dpb 2018-10-15

在 MATLAB Online 中打开

Look at

doc gradient

to be able to account for the timestep between samples.

The plots show (as does the recorded position plot) that you've got a pretty-near constant triangle-wave position vector; hence the velocity is going to be approximately a constant +/- for each side of the ramp. There's some minor fluctuations observable that aren't visible in the full-band plots, but if you zoom in on the first section alone, then the changes will be more obvious.

What, specifically, is the end result you're looking for?

请先登录，再进行评论。

请先登录，再回答此问题。

Follow Question