×
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

Accelerometer Frequency Response - Basics

Accelerometer Frequency Response - Basics

Accelerometer Frequency Response - Basics

(OP)
I am trying to select accelerometers for turning dryer cans in a Paper Mill.  Given the cans diameter and our machine speed, the cans run between 55 and 110 rpm.  I have some specs for accelerometers, but I am unsure about what I am reading.

From two salesmen, I have specs stating:

1)  120-360,000 cpm @ +/- 10%
    60-600,000 cpm @ +/- 3dB.

2)  300-600,000 cpm @ +/- 5%
    240-720,000 cpm @ +/- 10%
    120-1,200,000 cpm @ +/- 3dB

I am not an expert, but do these look as if they would function properly?  Given my rpm, these accelerometers look like they are sized for something a lot faster then my application.

Thanks in advance for any help.

Adam

RE: Accelerometer Frequency Response - Basics

None of them will go down to your slowest running speed, but that may not be terribly important. What are your most common failures? If unbalance is one, you probably don't have enough low end. If bearing problems are the main issue, then the accels above are probably fine...

"Why don't you knock it off with them negative waves? Why don't you dig how beautiful it is out here? Why don't you say something righteous and hopeful for a change?" Oddball, "Kelly's Heros" 1970

Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.
 

 
 

RE: Accelerometer Frequency Response - Basics

(OP)
Bearing problems are the main issue, but I would want this system to catch whatever else that might be going on.

I am just not that familiar with vibration monitoring.  I understand the roller bearings are turning at a faster rpm then the dryer can.  However the inner race would turn as the dryer can would.  This makes me think I do need more low end for that portion.

This is going to be a major installation, so I want to feel confident in the final decision.

Any other thoughts anyone?

RE: Accelerometer Frequency Response - Basics

Try using a velocity coil (seismic), you will find this gives you the cleanest data for your application.

RE: Accelerometer Frequency Response - Basics

I worked with someone that had a patent on a bearing monitor.  That used the ratio between peak noise spike and the average bearing noise to determine bearing condition.

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