Need help with vibration integration and changing units

Bteststands · ‎06-26-2015

I am far from an expert in vibration, none the less I found the following table and am now trying to reverse engineer my data that I took with an accelerometer to something I can compare with on the table.

Screen 54 of the following said to go from G's to inches/sec2, multiply by 386.1 so I wrote up a piece of code to do that along with the labview sound and vibe toolkit. We know our machine has excessive vibration but this seems to be a little redicioulous. Am I doing this correctly, please see the attached code.

Essentially how do I go from Acceleration taken with a 10.82mV/g accelerometer to inches/second and mil peak to peak. I have tried using the integration functions but I am seeing numbers that just seem too big to be real.

Is there any example code on how to do this somewhere?

Thanks,

Adam

keroba · ‎06-29-2015

Hi there,

Actually LabVIEW it self has some vibration example that can be useful for you. Here is a link that has some information about it and also explain where to find those examples

Making Acceleration Measurements With NI LabVIEW

http://www.ni.com/tutorial/7110/en/

I hope this works for you,

Regards

Bteststands · ‎06-30-2015

Thanks for the reply,

I have seen those examples but I am not sure they are helping me out too much, at issue is it seems like a lot of vibration data in the USA is based off of ips (inches per second) or displacement in mils peak to peak for example see the following image. I have done quite a bit of searching but am not necessiarly finding a good article that would describe how to code up something in LabVIEW to post process my recorded data taken in acceleration units of g's and convert it over to inches peak to peak as well as ips. I see that sound and vibe toolkit has the integration function but I am not sure I am properly using it. Do you know if there are any examples of how best to get displays in such units or writeups as to how to go about converting this to something along the lines of what suppliers and other vendors are displaying vibration data to us in? I haven't had as much time recently to work on this as desired but I also have to think I am not the first one to stumble on the need to do this considering how much vibration analysis in the USA uses such units.

Thanks,

Adam

keroba · ‎07-01-2015

Hi there,

According what you said:

I see that sound and vibe toolkit has the integration function but I am not sure I am properly using it.

Here is the manual of the Sound and Vibration toolkit:

https://docsamples.files.wordpress.com/2012/02/svt_um.pdf

https://www.ni.com/pdf/labview/us/sv_toolkit.pdf.

And if you are able to acquire the signal, you can do the conversion programmatically

LabVIEW