Overall vibration (ISO 10816)

[David Student]

Hi all,

I now started with LabView programing and I have big problem how I make measurement overall vibration by ISO 10816 (I need velocity RMS in band 10-1000Hz). I try search on this forum, and I tryed many variants how measured this vibration, but I neither way I not trust on 100%. Can you please somebody help me?

Thanks.

David Student

Czech Republic

[preston_johnson]

Consider using the proven Sound and Vibration Measurement Suite libraries, which build on LabVIEW's base RMS and integration techniques, and tune them to meet standards such as 10816.

http://sine.ni.com/nips/cds/view/p/lang/en/nid/209061

Alternatively, you will need to review the mathematical formulas behind the ISO standards. 

Hope this helps. 

[David Student]

Hi Preston,

We have Sound and Vibration Measurement Suite in our company, but i found only express function (RMS level) which is for conection to time signal. But i probably need some function for conection to frequency spectrum. I 'm create this string but i don't know whether is correct:

[preston_johnson]

You should use the lower level VIs which give you much more flexibility.  Consider the FFT functions, and the SVFA unit conversion VI. 

The manual is located here. 

http://digital.ni.com/manuals.nsf/websearch/E533CF43B486DE64862578D3000613DC

Preston

[411051]

Hi, I am attaching a vi developed for measuring vibration from single Accelerometer(100mv/g). It integrates the signal to get velocity and double integrates to get Displacement. Hardware used: cDaq :9174 , Module- NI9233. Once I calibrated the whole set up at about 1250 rpm. It was giving correct readings of all three parameters(Accln. , Vel. , Disp.) .As I go to higher rpm the readings are wrong.

As operating freq. of 9233 module is @21kHz, can I use it to measure the vibration of machine having rpm of about 7500 rpm?

I have taken sampling rate of 20ks/sec, Is it proper?

Pl. guide.

Regards

Sam