I am trying to do natural frequency analysis for Body in White. In this analysis the first 6 eigenmode need to be zero, but in my case only the first 5 eigenmode is zero and rest is non zero.
I am using Abaqus 2016 Solver to do this analysis.
My question is how can i get the value of 6th eigenmode equal to zero??
Thanks
Braj
Dear Prasad,
As you state, the solver has to extract the first 6 rigid body modes. I guess the source of the error is not the solver, but the FEM. The model may not be assembled properly, i.e. you need to check the welds and other joints. For good measure, you may try to extract the modes of a single component using the same parameters of the solver.
Thank you all for your reply. I have checked all the joints, but there are no loose parts in my model (This i have done through Abaqus as well as ANSA).
I have computed the same model by using Nastran solver and it shows the correct result... but when i use Abaqus it makes error.
The possible problem seems to be undetected constraint ( as Claudio Pedrazzi had mentioned). Is there any way to find the undetected constraint, because i can not find it through Abaqus visualization tool or through ANSA.... I have tried Animator also but got nothing...
- Badges
- Science topic