Chad,
Take a look at user subroutines UAMP and VUAMP which were introduced in the 6.8 release. Should be just what you are looking for.
-Eric
--- In
Abaqus@..., "Clary, Chadd W" <chadd@...> wrote:
>
> Hello all-
>
> I was curious if anyone has experience/references for implementation of PID control systems into an Abaqus Explicit model. In my application, I'm controlling muscle activation signals to generate a desired motion of the lower limb. I'm currently using an external program (Matlab) to implement the controller, update amplitude cards, call abaqus using the RESTART command to evaluate the next step in the model, calculate error, then repeat on the next step. However, it seems like there should be a more efficient way using user-subroutines (like VDLOAD) to accomplish the same goal within Abaqus. Suggestions on implementation and efficiency from anyone with such experience would be greatly appreciated.
>
> Thanks in advance,
> Chadd Clary
>
> Post-Doctoral Research Associate
> University of Denver
>
