Why the Main Node of a RBody moves automatically to a beam component.
I am defining a Node and using it as the main node of a Rbody. This Rbody is supposed to connect shell elements with a beam element. The Main node position is important as there is a Spring element that needs to have this node as one of it own. When I define this in Hypermesh, it looks like this:
Red element: RBody
Dark Grey: Beam to be connected with the shells
Green: Shells or Sh3ns
Light Grey: Spring
When I run Radioss with this model, there is no errors. I have Warnings due to the Main Node of some RBodies being connected to an element, but that has not been an issue in the past with other similar configurations. However, when I open Hyperview to see results, I get this:
I am afraid this would change the direction of the Spring force, as it is changing nodes locations.
Does anybody know why I am getting this effect?
Thanks in advance
Diego
Best Answer
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The main node of an RBODY will (by default) be moved to CoG of the (main and) secondary nodes, for this reason standard, recommended practice is that you should not normally connect anything to it (it should be a free node), you should connect your spring to a secondary node instead probably, you may change the behaviour of the main node by setting icog flag differently (e.g. icog = 3) but I would recommend leaving it as icog =0/1 and connecting spring to secondary instead
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Altair EmployeeAnswers
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The main node of an RBODY will (by default) be moved to CoG of the (main and) secondary nodes, for this reason standard, recommended practice is that you should not normally connect anything to it (it should be a free node), you should connect your spring to a secondary node instead probably, you may change the behaviour of the main node by setting icog flag differently (e.g. icog = 3) but I would recommend leaving it as icog =0/1 and connecting spring to secondary instead
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Paul Sharp_21301 said:
The main node of an RBODY will (by default) be moved to CoG of the (main and) secondary nodes, for this reason standard, recommended practice is that you should not normally connect anything to it (it should be a free node), you should connect your spring to a secondary node instead probably, you may change the behaviour of the main node by setting icog flag differently (e.g. icog = 3) but I would recommend leaving it as icog =0/1 and connecting spring to secondary instead
Thanks a million, it helped me to identify a bigger issue, the CoG is in the Beam element because the mass is so much hihger than it should be hahah Anyways, thanks as always Paul, this has been super useful.
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