dcascap
Aerospace
- Feb 6, 2024
- 54
Hi all,
I have a model which is a sandwich CFRP panel connected to a support structure, with around 300.000 nodes.
The 4 connection between the panel and support structure is modeled with RBE2 and spring elements. Depending on the stiffness of the spring the sol103 significantly differs on time calculation.
If for 1 connection I have the spring "rigid" stiffness 1e6 for translations 1e9 rotations (N mm, ton) then it takes around 5 minutes.
If I change some of the spring translation stiffness to 1e3 - 1e4 then it runs in around 30 minutes.
I'm searching for the first 10 modes which are in the range 50-500 Hz and I'm using Lanczos.
Do you know what can it be? or any tips?
I saw something about RDMODES do you know how to activate it in FEMAP?
I'm using v2412
Thanks in advance!
I have a model which is a sandwich CFRP panel connected to a support structure, with around 300.000 nodes.
The 4 connection between the panel and support structure is modeled with RBE2 and spring elements. Depending on the stiffness of the spring the sol103 significantly differs on time calculation.
If for 1 connection I have the spring "rigid" stiffness 1e6 for translations 1e9 rotations (N mm, ton) then it takes around 5 minutes.
If I change some of the spring translation stiffness to 1e3 - 1e4 then it runs in around 30 minutes.
I'm searching for the first 10 modes which are in the range 50-500 Hz and I'm using Lanczos.
Do you know what can it be? or any tips?
I saw something about RDMODES do you know how to activate it in FEMAP?
I'm using v2412
Thanks in advance!