In the Teddy example files I’ve come across scripts in which the eigenmodes and eigenfrequencies of a structure are calculated in ASE, and in others it is done with DYNA. The record ‘EIGE’ seems to require the same input in both programs. I’ve done some tests myself and noticed that the resulting eigenfrequencies of both programs are almost the same, but not entirely. However, I also noticed that defining lumped masses with the ‘MASS’ record has no effect in the DYNA calculation, whereas it does in ASE. In this MASS record, I included a load case (#lc_dl) which I defined in another ASE program and which contains two dead loads (but not the selfweight).
MASS LC #lc_dl
EIGE NEIG #nr_of_eigenmodes LC #lc_eigen_first
So my question is what the difference(s) actually is/are, and which program is recommended. It wasn’t entirely clear to me from the descriptions in the manual.
Thank you for reading.