Moving a pilot node with APDL commands between timesteps.

[mark.gjeloshaj]

I have an analysis i'm performing with multiple time steps and i'm trying to move a pilot node imbetween the time steps. I'm doing this in mechanical with APDL command snippets.I have 5 command snippets and 6 time steps. The intention was to move the node for each step 2,3,4,5, and 6 using identical command snippets that work via step selection mode. I noticed that it is skipping steps 1/2/3/4/5 and just solving step 6 outputting only one time step. an example of one of the snippets is below:

compression= -.741

/PREP7 csys,0 NSEL,S,,,GP2

N,GP2,  NX(GP2), NY(GP2)+compression, NZ(GP2)

ALLSEL,ALL

/Solution

I think the issue is due to the solver trying to enter /prep7 between each command snippet. is there anyway around this? LSwrite? I would think its possible to define time steps when a node is moved.

[dlooman]

Hi Mark,

I think you're right about the reason.  When I do something like you're doing I try not to leave solution.  I think you can issue the command NMOD,GP2,NX(GP2), NY(GP2)+compression, NZ(GP2) without leaving solution.  You'd have to test whether the MPC contact really got updated.  Or you could issue antype,,restart after re-entering solution.

Dave