Vibration sensoring: What is significant ?

Hi there! <br>I am working on a Mesureing System for mechanical Vibrations. I will use an Accelerometer and process the data with LabView.<br>Through Integration i can get Velocity and Displacement, right ? <br>What is significant data or plots for a vibration ? <br>Can i mesure/calculate Frequency as well ?<br>Thnax Alex

 

[tomirvine]

Well, you can integrate the accelerometer signal in the time domain to obtain velocity, and then integrate again to obtain displacement.&nbsp;&nbsp;A potential problem is that any spurious offset in the acceleration signal will cause huge errors in the velocity time history.&nbsp;&nbsp;Even greater errors will occur in the displacement time history.&nbsp;&nbsp;<br><br>Thus, the accelerometer signal should be highpass filtered prior to integration.&nbsp;&nbsp;Preferably, the highpass filtering should be performed on the analog accelerometer signal, prior to digitization.&nbsp;&nbsp;However, the highpass filtering may be performed on the digital signal, if necessary.<br><br>A complete answer to your question is beyond the scope of a message board reply.&nbsp;&nbsp;I have posted some relevant software programs and tutorials on signal processing at:<br><br><A HREF="

http://www.vibrationdata.com"

TARGET="_new">

http://www.vibrationdata.com</A><br><br>As

disclosure, a very small fee is required to download the software and tutorials at this website.<br><br>Sincerely, Tom Irvine

 

[brin]

You need to determine the requirement for measurement first, then consider everything you want to monitor or analyze.&nbsp;&nbsp;Be specific, focus on what it is you are looking for.

 

[dgallagher]

Check out the applicaiton note section on

http://www.reliabilitydirect.com.

There is articles on sensor selection and integration.