×
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

Phase Scenarios in Random Vibration

Phase Scenarios in Random Vibration

Phase Scenarios in Random Vibration

(OP)
We have a Random Vibration test Specification which consists of several Phases. This has nothing to do with phase angle of vibration, but are defined as several phases of Random Vibration testing with different levels (and hence g rms)and test duration.

How can that be analysed with FE? We have 7 different phases for each direction, and we could run 7*3 FE analyses. But how do we combine them to evaluate a total life?

RE: Phase Scenarios in Random Vibration

Im limited experience you could use a fatigue life analysis program. Your FEA code may offer it as an add-on. I've heard of, and seen the output from, FLAPS.

Basically each phase will cause a certain amount of damage. As you add the damage caused by each phase eventually you'll get a total damage estimate, typically given as the number of total test cycles to failure.



Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

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