Element Force and NODE acceleration during a simulation

[schaerr]

Hello Everybody,

In order to implement a controller within the ANSYS programm, I need to have access to the acceleration of a node and the force acting on an element. I know how to do this in the postprocess, but I couldn't find any helpful command to do it during a simulation (within a DO-loop)

What I found so far:
*GET,x1,NODE,10113,U,Y => results in the displacement in Y direction of node 10113
*GET,F,NODE,10113,F,FY => results in the force acting in Y direction on node 10113

the DERIV command doesn't work here. Also I think doing the derivation manually is not a really nice solution.. but a backup idea. I hope someone has a better approach.

Does someone have an idea how to solve this problem? The *GET command doesn't future the force together with 'ELEM' and I also couldn't find a A instead of a U to get the acceleration.

Thank you for your help.

Regards
Raphael

 

[meshparts]

Hello Raphael,

I hope a have a better solution: There is a toolbox for Ansys Mechanical APDL for user friendly definition of controller structures (GUI and macro based).

See description at

http://www.meshparts.de/CT

and a video of the controlled motion of a machine tool at

https://www.youtube.com/watch?v=-s8P5qTIwQo

Regards
Alex

MESHPARTS
Tuning Your Simulation

http://www.meshparts.de

 

[schaerr]

Thank you for the hint. I will check that.

What I found so far is, that
*GET,acc,NODE,10113,A,Y is a way to get the acceleration if the following setting is made:
OUTRES,ALL,ALL

10113 is the node of interest. Value is then stored in 'acc'

And the force of a contact element can be read out with the following command:
*GET,Fcontact,ELEM,11013,NMISC,44 where 11013 is the element number of the contact element. Value is then stored in 'Fcontact'.

Regards
Raphael