cbrn
Mechanical
- Jun 28, 2005
- 1,066
Hi,
can somebody share suggestions about the following:
Problem: how to analyze the rotation of a deformable body around an axis not passing through the centroid, when it accelerates from 0 rpm to regime speed and then stays at the regime for a while (eccentric rotation with centrifugal and unbalancing effects).
Why am I asking this: the rotating body has a complicate section shape, so I can't use PIPE16 or other similar methods; on the other hand, a full 3D model I am running right now seems too heavy for a transient analysis (it takes 20 mn per substep); it seems I can't take advantage of axisymmetry because the eccentric axis is ruining BC symmetry. I am wondering which is the most resource-saver method for this analysis. Maybe harmonic elements with MODE=1, ISYM=-1 ??? And which is the correct way to use CMOMEGA ?
Thanks in advance,
Regards
can somebody share suggestions about the following:
Problem: how to analyze the rotation of a deformable body around an axis not passing through the centroid, when it accelerates from 0 rpm to regime speed and then stays at the regime for a while (eccentric rotation with centrifugal and unbalancing effects).
Why am I asking this: the rotating body has a complicate section shape, so I can't use PIPE16 or other similar methods; on the other hand, a full 3D model I am running right now seems too heavy for a transient analysis (it takes 20 mn per substep); it seems I can't take advantage of axisymmetry because the eccentric axis is ruining BC symmetry. I am wondering which is the most resource-saver method for this analysis. Maybe harmonic elements with MODE=1, ISYM=-1 ??? And which is the correct way to use CMOMEGA ?
Thanks in advance,
Regards