distributed loads

[delphy90]

Hello everyone, I am new in this forum. I am enrolled in aerospace engineering and thesis work I am using patran/nastran for mechanical simulations.
I have the case of a panel subjected to a series of concentrated forces (12 for precision) agents along the z axis, equispaziate both along the x axis and y. I think it needs to use first the lbc field function command and subsequently impose the distributed load, but I have no result in my case of study.
Does anyone have any proposals on how to proceed?
thanks to all

 

[Onda]

Are the forces identical or different?
the easiest way is to have a knot at every point where you want to put the force and then apply the force directly to the knot.
12 forces are not so many
If you don't have no knots at that point, you can create rbe3s that spread the force on the surrounding knots.
If you place the model maybe it is easier.
field leave them alone, for 12 forces it is not worth to shake them

 

[delphy90]

first of all thanks for the prompt response. I'll attach you under the picture of the model I tried to make a mesh. I'm in the first place, so I don't even know if it's correct!all forces have the same intensity. But if I put the forces in every knot, the mesh must be less dense than I did?

 

[Onda]

remove the roundings and make a mesh with parallelepiped elements. That mesh is better than throwing it.

then put the forces in knots, or rather with rbe3 that do not add stiffness and spreads at least on four knots each.

read some documentation on rbe3 are not trivial

 

[delphy90]

Okay, wave. I try to follow your advice and I'll react. Thank you so much!!! )

p.s.: all the time I make mesh to a component I must necessarily switch from a surface mesh to a volume??? or can I stop at the surface?

 

[Onda]

if you want to analyze with shell elements do surface mesh. otherwise if you want to analyze solid bodies, use tridiemensional elements.