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.

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

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)

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?

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.

This is precisely what I need

Thank you for the reply.

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