I’m running a *FREQUENCY analysis after preloading the system with some centrifugal force.
*SELECT CYCLIC SYMMETRY MODES,NMIN=0,NMAX=1
First step is using NLGEOM=YES
What I do not understand is this message in the console when the second step starts.
Frequency analysis was selected
Perturbation parameter is active
Nonlinear geometric effects are taken into account
Decascading the MPC’s
¿What does Nonlinear geometric effects are taken into account in a *Frequency calculation mean?
If I set *STEP,PERTURBATION,NLGEOM=NO the message disappear.
If I set *STEP,PERTURBATION the message is shown but the calculation works and completes.
If I set *STEP,PERTURBATION,NLGEOM=YES Frequency stops and there is a new message:
*ERROR reading *STEP: PERTURBATION and NLGEOM are mutually exclusive.
*ERROR reading *STEP. Card image: *STEP,PERTURBATION,NLGEOM=YES
*ERROR in calinput: at least one fatal error message while reading the input deck: CalculiX stops.
¿Which would be the correct parameters to take my Centrifugal NLGEOM effects computed in the previous STEP into consideration for the Frequency analysis.?