SVL Integration

[vitor22]

Hi,

I'm having some problens with the SVL Integration (sound and vibration). I read many forum topics trying to find an answer for my problem but I didn't find one answer that i understood. Please look at the attachments to see what I'm doing. In the Example 1, I'm trying to integrate a sine simule signal using SVL Integration, but the results seems to be not right. In Example 2 I'm integrating an acceleration acquired with an accelerometer. In the second example I dont know if the results shown are correct. Some one can help me please?

Thanks

[vitor22]

Anybody?

[vitor22]

Please.

[vitor22]

Up

[Aurora_Tiffany-Davis]

I haven't used SVL Integration, but I have a suggestion.  I think you will get better responses on the forum if you provide more detail.  When you say "the results seem to be not right" what do you mean?  What specifically were you expecting to see, and what did you see instead?  

[vitor22]

Aurora,

In the example 1, I integrated a sine function and I was expecting a -cos function. The function shown is dropping with time (see the .vi example 1), thats not right. The second integration is dropping too.

[Lewis_G]

I can't open the VIs to check this because I don't have the toolkit installed however, if memory serves me correctly, the SVL Integration VI has a transient response.

"The SVL Integration VI uses digital filters to integrate the input signal, a lowpass filter with a ...

When I used this VI, I ignored the first batch of integrated data because it was incorrect due to all the complicated filtering thats going on inside.

Try putting your code in a loop so it continuously generates to give the SVL Integration VI to settle.

[vitor22]

Thanks Lewis,

but how can I put my code in a loop??

[Lewis_G]

Try this:

http://www.youtube.com/watch?v=hnx9WI2D9zU

[vitor22]

I could correct the data shown in the sine integration (example 1). I changed the "highpass cutoff frequency" to a very low number (0,0001) and it worked, I don't know why. But for more complex signals (with many frequencies) I dont know the correct value to put in the "highpass cutoff frequency" to it works correctly ( a change in the "highpass cutoff frequency" changes substantially the results).