POU_D_T_GD in DYNA_NON_LINE: possible?

Maggoo

Dear colleagues,

While trying to make a line model of a buggy, I am facing a dilemma: if I use POU_D_T or _E, the results converge, but to a wildly strange behaviour. If I try POU_D_T_GD it complains against not knowing how to calculate AMOR_MECA, even if I give it aproximate factors in AMOR_ALPHA and AMOR_BETA.

Is it possible to use POU_D_T_GD in a dynamical simulation as of now? I read in other posts that there is a work underway to improve it, and may be I am stepping in something that is still to be solved. The version I use now is the 2019 into CAELinux.

Any answer is welcome.

Thank you very much in advance for your attention.

Helio

Maggoo

Why I can't upload a file?

AsterO'dactyle

Hello,

Problem on server code-aster.org ...

Maggoo

Patience is the keyword!

Thank you very much.

AsterO'dactyle

Hello,

No one has asked for it internally from our customers

Maggoo

Dear colleagues,

Since I am not being able to add the HDF files, I will try to describe what I'm trying to do literally.

First, the geometry:

The light blue lines are an approximation of a human body, with the apex being the head, modelled with DIS_T and DIS_TR elements.

The green lines are the springs/cushions and are modelled with DIS_TR elements.

The yellow lines are arms, modelled with POU_D_T_GD, as are the rest of the structure.

The nodes connecting the cushions, arms and frame are restrained to have only DRZ free, all the others dofs are enforced to be the same.

At the connection arm/cushion, a mass element (DIS_T) of 25kg is set to represent the tire and parts related.

When I put a movement in the nodes of the tires, the structure deforms wildly, doing loops and all things weird.

My question is: is it possible to use POU_D_T_GD and DIS_TR elements with big displacements?

I hope the system allow me to put it now.

Thank you very much in advance.

Helio