×
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

Cross-head guide forces

Cross-head guide forces

Cross-head guide forces

(OP)
I'm trying to calculate the crosshead guide forces on a recip compressor but are struggling to find any literiture on it. Are there standard equations to calculate these forces?

RE: Cross-head guide forces

By "crosshead guide forces" I assume you mean the force perpendicular to the direction to motion.  That force is calculated from basic principals.  

Your piston load is simply piston area times pressure, call that force F.  Your rod is pinned at each end and has some length (call it RL), and makes some angle depending on it's length and cranshaft dimensions.  If your crank throw (half the stroke) is CT, you can derive the force perpendicular to the direction of piston motion from
Fr = F * CT / RL
Where F = Piston Area * Pressure
CT = 0.5 * stroke length
RL = distance from center of rod at crank to center of rod at wrist pin.

RE: Cross-head guide forces

Note: the above calculation is for when the crank shaft center to rod center is perpendicular to the rod center to wrist pin center.  Although this may be the maximum or close to maximum side load, you should check your particular case to determine the maximum side loading using basic principals.

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