×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Rail Vehicle Dynamics

Rail Vehicle Dynamics

Rail Vehicle Dynamics

(OP)
Can any one explain the static and dynamic forces that are coming on to the bearings in a rail vehicle.please respond

RE: Rail Vehicle Dynamics

Sarod...:
No, I can't explain....  Your question isn't something that lends itself easily to a few simple formulas or a number of steps out of a M.E. or Dynamics text book.  This has been something that has been studied and developed over the years.  Whole companies exist around this subject.  The railroads, the AAR (in the U.S.A. and Canada, Mexico), the RR truck and bearing manufactures, have reams of data and testing on this subject, it has just evolved from a basic understanding of journal bearings and then to roller bearings.  These groups are constantly discussing, testing and refining these components.  It is truly an area of study unto itself, and the bearing manufacture's literature and AAR Specs. would be a good place to start your study.  Obviously, the general theory on bearings remains the same, but this is a very tough environment, and the load classes vary from 50ton, 70, 100, to 125ton in the U.S.; also the railcar types vary (C.G., length, flexibility, etc.) which lead to different dynamic actions such as rock-n-roll, truck hunting, etc.  Then the running environment also varies; unit trains tend to run under full load or empty, constantly, many miles per year; while general service railcars run few miles per year and under varying loadings, not always at max. cap'y.; finally maintenance-of-way and jointed vs. welded rail plays a big part in car dynamics, and this is generally improving while miles per year is increasing.  Basically, one bearing design serves the worst of all of these conditions.  Bearings have become an incredibly refined and dependable railcar component, not to say they don't fail, but they aren't the maintenance headache they once were, with journal bearings.  Press them on a proper axle to the manufacturer's specs. and put them under a properly fitted truck and they perform quite well.
 

RE: Rail Vehicle Dynamics

Ditto to what dhengr says...

RE: Rail Vehicle Dynamics

I design railroad equipment. Thankfully, we usually use purchased production suspensions and bogeys/trucks. It can get really complicated for the suppliers.

Try www.Starfireengineering.com as an example of what is involved.

kcj

 

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! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close