×
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

frequency extraction after forming process

frequency extraction after forming process

frequency extraction after forming process

(OP)
Hey guys and girls,

i've some problem that i'm working on:

I've an explicit forming simulation and i want to use a butterworth filter to have a good force-displacement-curve.
To find out the best cut-off frequency of my butterworth-filter i found this in the abaqus manual:

"If you perform a natural frequency extraction analysis on the final model configuration, you will find that the fundamental frequency at the end of the forming step is approximately 1000 Hz. Hence, a cutoff frequency that is slightly larger than this value is a good choice for this model."

Well i did frequency extractions before so i tried to do one on a deformed part. But i was not sure about the results. That's why i tried the example with the forming channel. And i didn't get the frequency of 1000Hz but 686Hz instead.

I tried it the following way:
1. I ran the forming analyses
2. I copied the model and deleted everything despite the deformed part
3. I made up a frequency step
4. I imported the results of the forming analyses by a predefined field in initial state
5. I ran the analyses

But unfortunately i didn't get the result, that the authors of the abaqus manual got ;)

Has anybody an idea what's wrong with my proceeding?

Thanks in advance

Marko




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