×
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

Floating Piston Natural Frequency

Floating Piston Natural Frequency

Floating Piston Natural Frequency

(OP)
Is it possible to calculate the natural frequency of a free floating piston in a piston accumulator?

Background: I have a long piston accumulator (~14 ft long)
with a 14" diameter piston, air on one side, ethylene glycol on the other. Its purpose is to receive the fluid which is exhausted from a throttling process which I won't describe now. In monitoring the accumulator pressure on the liquid side during the process (starts at ~400 psi and ends at ~600 psi) I am observing high frequency oscillation
which is not normal. These oscillations are evident in other parts of the process system as well.  I am guessing that one possibility for the source of the unknown oscillations may be that the free floating piston is chattering during its stroke, possibly due to excess cylinder wear, and the cylinder is possibly worn into a slightly oval shape.   I cannot at this time open and inspect. I can make educated assumptions concerning clearances between cylinder I.D. and piston O.D. without disassembly.   I can also make educated assumptions on piston velocity.

What method might I use for calculating theoretical frequency if I know piston velocity and clearances? Is it possible?
Thankyou for any ideas.
Tom

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