×
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

ANSYS Time History

ANSYS Time History

ANSYS Time History

(OP)
Hi,
I am applying time history acceleration to my ANSYS model which contains gap elements.

The time history input starts with 0.0 acceleration for a while before an acceleration is applied to the structure.

For the loading: The initial condition is for the structure under gravity acceleration. The time history is then applied.
After running the analysis, I found out that I am getting noise at the begining of the transient (forces in the structure although the applied accelerarion is zero, i.e. structure is under gravity acceleration only).
Does anyone know how can i get rid off or minimize the noise in the structure at the beginning of the time history (other than increasing damping). Please keep in mind that the structure has gap elements.

RE: ANSYS Time History

Are there initial strains that might cause some gaps to change state?  Start with a few time steps of no load at all (because transient solutions make use of results at t-i).  Then apply the initial gravity load gradually as a ramped load from zero so that the gaps can find the proper equilibrium.  Then give the structure enough time to calm down before applying your time history load.

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