Printing Natural Frequencies and mode shapes in a separate output file

SOFiSTiK
1

Hello

I am using Teddy and would like the commands for printing the computed natural frequencies and mode shapes in a dedicated output file. Unfortunately, it is not clear which key from the cdb database corresponds to these values in the manual.

1 Like
2

Hi,

I can retrieve the eigenvalues from the loadcase itself, as it stores Ω (omega).
@KEY KWH LC_EIGE

Is this what you are looking for?
eigenvalues.dat (931 Bytes)

3

This is very helpful although I extracted these in the end from the @RPAR field, however, I would also like to extract the mode shapes in textual form. I assume it is more convenient to do so via @KEY KWH LC_EIGE?

4

If you consider the mode shape to be the displacement vectors of the nodes for the given eigenvalue, you can retrieve the displacements for a given load case with

@KEY KWH N_DISP

But this will give you as many values as the system has nodes.

5

This is precisely what I need :slight_smile:
Thank you for the reply.

6

Hi @echatzi I think To print the computed natural frequencies and mode shapes in a dedicated output file using Teddy you will want to use specific commands that reference the appropriate keys in the cdb database. you can do

  • Natural Frequencies
  • Mode Shapes
  • Output Command