Hello!

I've modeled a simple wing box with some spars and ribs in Ansys APDL. I chose SHELL181 for all the elements. My first natural mode of vibration is bending, but then I get local modes for all the other frequencies instead of the expected torsion and bending modes. I've tried to play with the thickness but I could not improve the results. Does anyone knows why I am getting such results and how to prevent this? Thanks a lot.

Similar questions and discussions