How do you derive speed and acceleration data position?

Hello

We are working on a project that requires data of distance, speed and acceleration over time.  We use the NI 9234 compactDAQ chassis connected to an accelerometer.  The accelerometer is attached to a topic plastic cantilevered (rectangular) which is "gathered" - a bit like a ruler on the edge of a table hanging like a diving board.  We will gain about 2 k samples/sec.  There is no problem getting the acceleration data, it is transformed in speed and distance, which is the problem.  There is a link OR a solution (http://decibel.ni.com/content/docs/DOC-4308, see below), but it does not work.  I remember in my class of calculation that you integrate acceleration to get the speed, you integrate the speed to get remotely.

This gives us the following graphs:

Acceleration seems good, of course.  But the speed looks like it is a sinusoidal signal riding on a curve that dips down and then decreases exponentially.  (This dip and decomposition looks like the answer to an excessive vibration.)  I expected to be similar to the acceleration, speed, but out of phase 90 degrees (symmetrical relative to the origin).

And we want the position and not remotely.  Position would also be a sine wave exponentially decaying.

So, what math should apply?

Thanks in advance,

Shadowfeld

Hello

Conversion acceleration in the speed/movement or movement speed requires the digital integration. In LabVIEW, you can take the accelerometer measures and represent this signal in acceleration, speed or movement by running the example VI (Figure 1) included in the next tutorial for area Developer:

1 excerpts from acceleration, speed and displacement signal processing: http://zone.ni.com/devzone/cda/tut/p/id/4989

Best regards

M Ali

Technical sales engineer

National Instruments

Tags: NI Hardware

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