hexagon logo
Register Sign in
  • State Not Answered
  • Replies 3 replies
  • Subscribers 3 subscribers
  • Views 73 views
  • Users 0 members are here
Options
Related

FREE-FREE Modes

shaheer.iqbal
Hello
I have a model that I am checking for any errors. I ran a free-free modal analysis. Instead of getting 6 rigid body modes (zero), I am getting the first 3 modes as 0 while, the other 3 (rotational) are not perfectly zero. It has a value of 0.2
 
Any recommendation on how to debug and know what is going on?​
Parents
  • 0
    Short answer: you will get rigid modes any where 2 parts aren't successfully glued. There can be multiple causes. The most common include:
    1. Contact detection distance (ERROR) too small,
    2. Missing elements in contact bodies (BSURF),
    3. Incorrect IGLUE flag (need 2 or 4 for moment carrying glue with shells/bars).
    4. Incorrect contact options (COPTS/COPTM)
     
    To visualize contact status, include BOUTPUT=YES as a Case Control Result Request to get contact status for Subcase 0. Be sure to save results as HDF5 or OP2 to post-process.
     
     
Reply
  • 0
    Short answer: you will get rigid modes any where 2 parts aren't successfully glued. There can be multiple causes. The most common include:
    1. Contact detection distance (ERROR) too small,
    2. Missing elements in contact bodies (BSURF),
    3. Incorrect IGLUE flag (need 2 or 4 for moment carrying glue with shells/bars).
    4. Incorrect contact options (COPTS/COPTM)
     
    To visualize contact status, include BOUTPUT=YES as a Case Control Result Request to get contact status for Subcase 0. Be sure to save results as HDF5 or OP2 to post-process.
     
     
Children
No Data
© 2025 Hexagon AB and/or its subsidiaries. Privacy Policy | Cloud Services Agreement