×
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

Automatic Stabilization
5

Automatic Stabilization

Automatic Stabilization

(OP)
Hi everyone,

I am using a constant damping factor for the Automatic Stabilization and it works well in converging my analysis.
As I increase the damping factor (the default value is 0.0002) it even works better.
I wonder what is the damping factor doing and how much I can increase or decrease it from the default value.

Thanks,
Sep

RE: Automatic Stabilization

2
It creates a non-real viscous stiffness to avoid zero stiffness. The more you increas the factor the more stiffness and better convergence but less realistic solution.

RE: Automatic Stabilization

2
The damping is ramped down to 0 at the end of the solution step but could cause inaccurate results is some cases. Typically I check the energies of the solution to see if the energies associated with the damping is deemed significant compared to the total energy for my case. You can also do s sensitivity to see if changing the value has a significant effect on the results of interest. I hope this helps.

Rob Stupplebeen
https://sites.google.com/site/robertkstupplebeen/

RE: Automatic Stabilization

From my experience, be carefull in using it. Always check with a solution without it, or, if you can't get it to converge without, keep reducing the value and see if you have any convergence in that. Using the energy is a good point, but depending on the problem you can get a large influence, even if the energy is small.

RE: Automatic Stabilization

(OP)
thank you guys for your helpful comments.

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