×
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

Wireless Vibration Monitoring

Wireless Vibration Monitoring

Wireless Vibration Monitoring

(OP)
I need to make use of wireless on-line vibration monitoring on blades of a rotating fan. What technologies or techniques are available other than scanning laser vibrometers?

RE: Wireless Vibration Monitoring

I don't know of any technology to do wireless vibration measurements on a rotating member.  It is interesting because any conventional accelerometer or transducer would mostly see centrifugal forces (if it is mounted radially)  and would therefore have a mostly sinusoidal accelerations which I assume are not what you are looking for.  If it is mounted axially, I would expect some leakage from the radial forces and the same thing would happen.

However, you could mount strain gauges on the fan blades or shaft and monitor the stresses during rotation by use of a transmitter.  The stress readings could be calibrated to an equivalent vibration level.

RE: Wireless Vibration Monitoring

SPATE might be worth a look.

Stress patterns by thermal emissions.

It's a camera that gives you stress contours. I don't know if it can cope with a rotating target.

SDRC or GenRad used to sell the system.

Cheers

Greg Locock

Cheers

Greg Locock

RE: Wireless Vibration Monitoring

You could do something really cheap and nasty by setting up a minidisk recorder to a portable accelerometer power supply.  I use a SONY MZ-R30 to record at 44 kHz digitally and I use a PCB 480E09 power supply to power the accelerometer.  This will give you about 40 minutes of recording time.  Tape everything to the fan shaft and start it recording - start the fan.  After the fan is stopped you can play the vibration back into any vibration analyzer which has an aux input connection.  The beauty then is that you can analyze at different frequencies under all sorts of conditions.

Good luck

Ron Frend

RE: Wireless Vibration Monitoring

That's evil.

Incidentally you shouldn't use a minidisc for analytical work unless you really understand the compression formula they've used, or disabled it somehow. As I remember the algorithm only retains (worst case) 25% of the data!

 



Cheers

Greg Locock

RE: Wireless Vibration Monitoring

Sometimes someone posts exactly the right information.

Thanks

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