K6ROT
K6ROT
(OP)
Hi,
I have a FEM model. With different K6ROT values, the frequencies are different. The 1st frequency with K6ROT equal to 1.0 is about 9 hz lower than the 1st freq. with K6ROT equal to 100. It seems some locations need to be stiffened up. How can I find these locations? Currently I don't see any excess displacements of the elements (except that rotational displacements on 1D elements are hard to see). How can I fix the problem, so that the frequecies are simliar with different K6ROT values? Thank you very much!
I have a FEM model. With different K6ROT values, the frequencies are different. The 1st frequency with K6ROT equal to 1.0 is about 9 hz lower than the 1st freq. with K6ROT equal to 100. It seems some locations need to be stiffened up. How can I find these locations? Currently I don't see any excess displacements of the elements (except that rotational displacements on 1D elements are hard to see). How can I fix the problem, so that the frequecies are simliar with different K6ROT values? Thank you very much!





RE: K6ROT
RE: K6ROT
the k6rot influence the drilling stiffness of the shell and influence the TRUE stiffness of the beam.
You should avoid this (if this is the case) connecting more then one grid point to the ends of beams.
RE: K6ROT