Error met when run Gebt

1. 

   Yonggang CHEN @ 5:39 am on 24 May 2021 — Edited @ 10:09 pm on 03 Nov 2021

   Hi,

   I am trying to use GEBT for natural frequency analysis of a beam.

   There is one error out when submit the model with gebt command.

   Please see attached both the error msg and model data.

   Anyone could help?

   Thanks in advance.

   Y.G.

   PS, it is strange that there is only one file could be attached.

   

2. 

   Yonggang CHEN @ 5:41 am on 24 May 2021 — Edited @ 5:42 am on 24 May 2021

   Here is the model data.

   eigen-002.txt

   2 KBClick to download

3. 

   Su Tian @ 6:41 pm on 02 Jun 2021

   Hello,

   The issue seems to be the boundary condition. Your original inputs is

    

       1 2 3 0 0 0

       0 0 0 0 0 0

    

   for both ends. So I guess you are trying to create a beam with both ends simply supported. If this is the case, then the correct BC setting should be for point 1

    

       1 2 3 4 11 12

       0 0 0 0 0 0

    

   and for the point 2

    

       1 2 3 10 11 12

       0 0 0 0 0 0

    

   The key is that either natural or essential BC must be set for each one of the six dofs. Also the rotational dof around the beam axis (4) must be constrained at one end.

4. 

   Yonggang CHEN @ 10:22 pm on 08 Jun 2021

   Hi Tian,

       Just followed your instruction, submit the modified model to Gebt. Same error.

    

   Thanks!

5. 

   Su Tian @ 3:52 pm on 28 Jun 2021

   Hello,

   Could you try the updated code? cdmHUB - The Composites HUB - Resources: Geometrically Exact Beam Theory: Supporting Docs