×
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

Nastran external superelement and forces recovery

Nastran external superelement and forces recovery

Nastran external superelement and forces recovery

(OP)
Hi there,

Let's see if some of you can help me with the following issue, please:

I am working on the mechanical analysis of a satellite (spacecraft(SC)+ payload(PL)). I need to create an external superelement (ESE) of th PL and validate the process by comparing the results obtained with the complete physical model (SC+PL) to the results obtained with the model using the ESE (SC+ESE).
I am recovering accelerations and displacements in some nodes and forces in some CELAS, CBUSH and CQUAD elements.
A modal analysis shows a perefect correlation between the two models (with and without ESE).
I ran a sine vibration analysis and I got got also a perfect correlation between the two models when comparing accelerations and displacements. However, i didn't get a good correlation with the forces in some CELAS elements.
The reduction method used for the external superelement is the Craig-Bampton method.
Do you know if there use to be any trouble when trying to recover forces in a dynamic analysis with Nastran when using external superelements (by Craig-Bampton method)?

Thank you in advance. Have a good day!

Javi

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