Pre-stressed modal analysis: Adding additional supports in between structural and modal solves
Pre-stressed modal analysis: Adding additional supports in between structural and modal solves
(OP)
Dear all.
I am running a pre-stressed modal analysis. A stator for a rotating machine consist of several modules tied together with a tie-rod, which also works as a guide.
When assembling, the stator will only be clamped in one end, tied together, and then clamped in the other end. When running the analysis, i would thus like to use a fixed support first for the structural analysis, and then before the modal analysis, add a fixed support to the opposing end.
Is it possible to add the additional fixed support after the structural analysis for use in the modal analysis?
Thanks in advance, and best regards,
Mikael Mosbech Eronen
I am running a pre-stressed modal analysis. A stator for a rotating machine consist of several modules tied together with a tie-rod, which also works as a guide.
When assembling, the stator will only be clamped in one end, tied together, and then clamped in the other end. When running the analysis, i would thus like to use a fixed support first for the structural analysis, and then before the modal analysis, add a fixed support to the opposing end.
Is it possible to add the additional fixed support after the structural analysis for use in the modal analysis?
Thanks in advance, and best regards,
Mikael Mosbech Eronen
RE: Pre-stressed modal analysis: Adding additional supports in between structural and modal solves
If you are using WB then you need though to add command snippet for the restrain that will be done with the D apdl command.
Med venlige hilsen
EPK
RE: Pre-stressed modal analysis: Adding additional supports in between structural and modal solves
RE: Pre-stressed modal analysis: Adding additional supports in between structural and modal solves
I was hoping there would be a more WB friendly way of doing it, but i guess i will look into how to use the APDL command within WB.
Best regards,
Mikael
RE: Pre-stressed modal analysis: Adding additional supports in between structural and modal solves
CMSEL,S,FIXNODES ! This selects the nodes
D,ALL,UX,0 ! Fix X for sel. nodes
D,ALL,UY,0
D,ALL,UZ,0
ALLSEL,ALL ! Selects all nodes again
From an Fea point of view it is fine, since the static analysis generates the geometric stiffness matrix which is added to the standard global matrix and then the BC are just changed (so dof will be condensed out form the global matrix). Try it out on a simple model.
@ FEA way - please if you are not really sure about this do not provide help (unless you have a long exp. in Ansys which I cannot see in this forum) - because if advice is not correct things can go wrong!
RE: Pre-stressed modal analysis: Adding additional supports in between structural and modal solves
RE: Pre-stressed modal analysis: Adding additional supports in between structural and modal solves
RE: Pre-stressed modal analysis: Adding additional supports in between structural and modal solves