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Beam Offsets

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ULBsha:
Hi,

Regarding the beam offsets, in one of the Pro tutorials (AP1) related to V5 for which *.CL files were updated, it is shown that the finite element definition of the beam is updated when we change the reference plane from Centroid to Top or Bottom, by using Beam Offsets.

However, in V6.4, I have 3 questions about this Beam Offset:

1) Why the default option in the Reference Plane is set to "TOP", and not Centroid, whereas when I visualise the FEM in Patran, the beams are defined such that their centroid (and not top of them) are set on the nodes (grids) !?

2) When I try to change it, for instance, from 'top' to 'bottom', nothing happens... nothing in terms of final results when I re-analyse everything, nor when I visualise them (still at the same place).

3) I don't find the update in the FEM files either (which makes sense, since nothing happened in the analysis nor in the visualisation).  Where can I find this update in the FEM files please ?


Thanks a lot.

Regards

Ryan:
1) I believe the default is set to TOP since most beams on an aeroshell will be attached on a skin. Unfortunately the offset definition is not imported from the FEM.

2, 3) When you change the beam offset, the updated FEM files will reflect the latest offsets. In Nastran, the offsets are found on the element definitions.

ULBsha:

--- Quote from: Ryan on July 25, 2014, 06:46:24 AM ---1) I believe the default is set to TOP since most beams on an aeroshell will be attached on a skin. Unfortunately the offset definition is not imported from the FEM.

--- End quote ---

Yes. That makes sense. But the fact is that it doesn't seem to work !
I attached a figure (FEM files visualized in Patran) that clearly shows the beams are not correctly set. In HyperSizer, the Reference Plane is set to 'Top', while in the figure it seems to be the centroid.



--- Quote from: Ryan on July 25, 2014, 06:46:24 AM ---2, 3) When you change the beam offset, the updated FEM files will reflect the latest offsets. In Nastran, the offsets are found on the element definitions.

--- End quote ---

I was also expecting such a behaviour. However, once again, it doesn't seem to work. When I change the Reference Plane via the Option tab, nothing happens. I also analysed the component, group and the whole project to see if there is any update on the FEM files... but the beams are still like before (see figure)... !

ULBsha:
Any suggestion... ?

Thanks a lot

Ryan:
What do the updated CBAR entries look like per component? You should be able to change the offset style, update the FEM, and look at the CBARs in the *.CEL or _i.bdf file to see the offsets.

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