acceleration integration
acceleration integration
(OP)
Hello,
I am currently working on a project where I need to find a digital integration for acceleration data. I believe I have found a sufficient integration filter that I have tested in matlab but after the first integration there is a dc offset that makes the second integration to get displacement data impossible. It would be ideal to find another type of filter to remove the dc offset for my project. I have tried basic high pass filters with no luck. Is it possible to do such a thing? and if so could someone advise me on a sufficient high pass filter?
I am currently working on a project where I need to find a digital integration for acceleration data. I believe I have found a sufficient integration filter that I have tested in matlab but after the first integration there is a dc offset that makes the second integration to get displacement data impossible. It would be ideal to find another type of filter to remove the dc offset for my project. I have tried basic high pass filters with no luck. Is it possible to do such a thing? and if so could someone advise me on a sufficient high pass filter?





RE: acceleration integration
Anyway, another method is to subtract the straight line joining the dfirst and last points in the integrated data - this is nice from apractical point of view, but is analyitically treacherous.
Or you can remove the average level from the original data.
This is less dangerous.
Cheers
Greg Locock
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: acceleration integration
There are many ways to do high pass filtering. A small twist on Greg's method is to subtract a rolling average.
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RE: acceleration integration
Of course, 5 minutes in MathCad would tell me.
Cheers
Greg Locock
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: acceleration integration
OUT(n) = IN(n)-IN(n-1)+ [alpha x OUT(n-1)]
Where alpha is the decay constant between 0 and 1