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


Torsional Critical Speeds for variable speed trains

Torsional Critical Speeds for variable speed trains

Torsional Critical Speeds for variable speed trains


Could you please give some recommendations on the following questions:

For variable speed compressor train rated approx. 6 MW power which has two casings - does it make sense to make torsional measurements of critical speeds during mechanical running test or performance test ? Because what would you measure then without accounting for electrical excitations which come from the Motor and converter system ?

In other words, I am guessing that it would only make sense to measure the torsional critical speeds with the complete string either at when the train is commissioned at site or during a special test with complete unit including all the electrical components and eventually at rated torque. Without doing that I would have to blindly rely on the torsional study made by compressor Vendor which sounds not good.

Is this thinking correct ? Could you please share how do you approach these issues from your experience standpoint ?


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!


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