×
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

Machine Press Dynamic Loads

Machine Press Dynamic Loads

Machine Press Dynamic Loads

(OP)
I'm designing a steel framed structure and foundation system for several presses up to 4500 tons (600,000 press weight). I have a pretty good handle on operating dynamic loads and  but need help on determining the dynamic loads due to a sudden part failure. This is an "internal" force that creates large vibrations. How do I determine the force on the support structure?

RE: Machine Press Dynamic Loads

Sounds like a spring & mass problem to me.  You're basically storing energy by deflecting a structure with a given mass (and attached mass(es)).  If you know the force and deflection you can calculate the acceleration (and, thus, force) of the masses when it releases.

RE: Machine Press Dynamic Loads

A large mass under the presses works well to take care of the vibrations.  If I remember the rule of thumb right 10 times the dynamic load will minimize the vibrations to the structure.  The problem with this is that I have never run the numbers to check how true this is and what are the ground condistion for this to be true, it is just the rule of the thumb that a old engineer told me years a go.

Chris

"In this house, we obey the laws of thermodynamics." Homer Simpson

RE: Machine Press Dynamic Loads

(OP)
The  "stored engery" is within the press. The heavy massed press frame will confine the broken part but vibrate when the part breaks. Sort of an internal explosion. I've designed the supporting structure for a vertical dynamic load of 100% of the press weight. My foundation mass is roughly equal to the press mass. This is similar to what I've designed in the past. Any additional thoughts would be appreciated. Thank you for your previous comments.

RE: Machine Press Dynamic Loads

There is a good article Principles of Foundation Design for Engines and Compressors which discusses rotary dynamics.
I think I downloaded it from Sliderule era's web site of good old material.  

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