integration of decaying acceleration signal

[Sehgal]

Hi

I have an experimental acceleration signal that is decaying with respect to time

I want to get velocity by integrating this signal. Practically the velocity signal should also decay with respect to time. But the integrated signal is not decaying ? Where am I making a mistake?

Corresponding VI and The AccelerationDATA is in the attached files.

Thanks in anticipation

[Sehgal]

Hi

Sorry for inconvenience

Photo is attached herewith.

[Kevin_Price · Accepted solution]

Looks like you have some positive DC offset in the accel signal which then integrates into a velocity ramp.  A quick and dirty approximate solution would be to subtract off the best-fit straight line from the integrated velocity.

-Kevin P

[johnsold]

Or, as I just posted to the same question in the Signal Conditioning Board, subtract the mean before integrating.

Lynn

[johnsold]

I put a link to this thread in the other Board.  Let's keep the discussion here.

Lynn

[Henrik_Volkers]

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Sehgal wrote

I want to get velocity by integrating this signal. Practically the velocity signal should also decay with respect to time. But the integrated signal is not decaying ? Where am I making a mistake?

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I think your mistake is your understanding of an integration 😉
If you accelerate something and stop the accelerating the item will stay at a constant velocity .....

If you want to include something like friction to get the velocity down to zero, I would add a 1 order highpass filter ... and put the timeconstant somewhere in the seconds rage ...

[Sehgal]

Thanks Kevin

Using your technique I have solved the problem.

Thanks a lot