Modal analysis using substructuring strategy

Hi Richard,

I should have thank you earlier ! But it's never too late, so thank you for your answer ! My three previous points are now not a problem anymore, and this is awesome. I worked on very simple problem, but now I'm trying to write the big code !

I do have all the geometries I need to construct the whole model. But now the only thing which will be annoying is to get the local coordinates of each interface (coordinates of the group of nodes in each substructure). My objective right now, is to extract coordinates (maybe using a function like CREA_TABLE ???), then extract the right values and create the exact coordinates (global base) of all the interfaces by using a python script.

I do not know if I'm quite clear, so I advise you to take a look at the little graphic I made about the general idea.

Best,
Quentin

Scheme

Hello Quentin,
nice that you advance that fast with your project!

If you want to get coordinates from groups of nodes or nodes directly, I think there are better ways of doing that then with crea table.
There is a dedicated method which allows you to access the whole mesh data structure as a python object. Here's an example code snippet:
You will find a detailed description of the available options in the Utilitai/partition.py source code.
You can also manipulate the mesh and transform it back into a Code_Aster mesh object to run your calculation on it.

Concerning your method, I'm not really confident to judge it since I never worked with substructures, but it seems perfectly reasonable.

Best,
Richard

Hi Richard,

That's what I was thinking about, using python must be the right choice. But It's been a long time I did not use it. Do you know a good reader/writer of python script for linux, It might help a bit more than the gedit app I'm using right now^^. I don't really have the time to do the things "correctly" (doing tutorials for baby users etc...).

What I really need, is the nature of each OBJECT : dimension, type, etc... of "meshPY.gno".
For now, all I have succeeded in, is extract mesh, and write the number of nodes in a ".txt"

I don't get how I can have the help of such functions :
"You will find a detailed description of the available options in the Utilitai/partition.py source code. "
What does it mean ? May you explain me as if I had 2 years old, like click there, then there. I was unable to get any information on the majestic google. Should I use a command window typing "python", then using help after loading the library ?

Hello,
sure:
- go to the directory where you installed Code_Aster
- got to ASTERVERS/lib/aster/Utilitai and open the file partition.py (for me ASTERVERS=11.6)
- read it (especially the "EXEMPLE D'UTILISATION" of the MAIL_PA class)

Best,
Richard

I think I have a problem, the computer can't find anywhere (in the whole computer) a folder named "Utilitai" or a file named "partition.py".

The command I used "find /home partition.py" and "find /home Utilitai"

Any idea where it can be hidden ? My salome_meca installation is in /home/qmercier/salome_meca

Plus, it's kinda weird because aster works correctly, and the library as well. I have succeeded writing a file with the number of nodes, and nodes group coordinates.

Last question, is there any object that contain the name of the group ? Something like "mesh.gno.name"

Gavroche wrote: The command I used "find /home partition.py" and "find /home Utilitai"

Try:

Gavroche wrote: Last question, is there any object that contain the name of the group ? Something like "mesh.gno.name"

I think its a dictionary where the key is the group name and the value is the list with the nodes belonging to the group.
So mesh.gno.keys() would return the list with all node group names and mesh.gno.get("specific_group_name")
would return the list of nodes that are in that group (if the node group with name "specific_group_name" exists, otherwise it would return None).

Best,
Richard

Best,
Richard