×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

ONE THIRD OCTAVE STUFF

ONE THIRD OCTAVE STUFF

ONE THIRD OCTAVE STUFF

(OP)
HELLO:  I am analyzing some accelerometer vibration data and have to put it in a one-third octave format.  My question has to do with noise reduction. In a normal analysis the noise can be reduced in the frequency domain by successively averaging the data blocks of the PSD.  My software(DaDisp) does the accelerometer to octave conversion, but where do I do the noise reduction.  Can I do it in the one third octave domain or, take the PSD, do the reduction, and then invert the resulting PSD and then do the octave analysis?

Your input is appreciated
Regards
Dave  

RE: ONE THIRD OCTAVE STUFF

You can convert to third octaves at any stage in the proceedings, ie before or after summing the magnitudes^2.

I always found it helpful to think about where the energy from each frequency was going.

There is a gotcha, are you doing a triggered, gated or phase locked analysis? If not you should be OK.

If you are attempting to get transfer functions I'd do the conversion to third octaves last, given the choice, as phase and third octaves are a funny mix.



Cheers

Greg Locock

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources