×
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

Gravity and Proportional Damping Coefficents

Gravity and Proportional Damping Coefficents

Gravity and Proportional Damping Coefficents

(OP)
Hello

A weird problem has emerged in my model. In short, my model consists of essentially 2 hollow bars (composed of shell elements) falling to the ground. The simulation behaves as expected, until I changed the material damping.

I decided to change the material damping (specifically alpha and beta in the material definition). They were originally set to relatively low values with respect to my model. But once I changed beta to a higher value (around 1E-3) the bars cease to fall to the ground and just remain fixed in space despite gravity being applied to the entire model.

I'm pretty baffled by this. Clearly I am misunderstanding something. The only variables I change in my sim. are alpha and beta (proportional damping coefficients). And once beta becomes larger, the bars cease to fall to the ground.

Can anyone tell my what I'm doing wrong?

Thanks


Note: I am using mass scaling in this simulation, but I'm told that mass scaling does not effect gravity so it should not be relevant to this problem.

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