I am just trying to add a flexible body with a force element between two of its interface nodes to reinforce the structure.
I can't share the model, but I think what gives a good picture of the idea is a flexible model of a tuning fork, imported from a mnf file.
At the two fork Ends imagine the interface nodes which I want to connect with a GForce element (or beam)..
As Adams basically does not allow to do this I thought I just might define two GForce elements, each between the Flex Body an ground and define the forces of restitution dependent on the relative displacement of the Interface nodes (considering the Initial offset of course)
A first testmodel run internally did not make Adams complain. What I wanted to ask is if somebody knows about issues that I might come across in a later stage or knows a more elegant way to handle this.
For us who works mainly with ADAMS/Car, the use of interface parts are standard. It makes the use of communicators simpler.
So no matter what @Kent West says, there is no danger in using dummy parts at the interface nodes.
We even have macros that loops over all interface nodes and automatically creates all the interface parts and associated fixed joints for any flex body in our templates.
My macros even automatically create construction frames and mount/location communicators on those interface parts for a more convenient use in A/Car ...
Does someone actually know how rigid parts are connected (or forces applied) to flexible parts in Adams?
From the cmd and afm fiiles I can only see hat the connection is defined via the joint's (or forces') marker positions without a distinct reference to a certain interface node of a flexible body.
The reason why I am asking is that I would like to import a model from FE which has two concident nodes that are individually connected to different elements of the structure via rigid elements..
So how can I be sure, that when I connect rigid bodys to the structure in Adams (or apply forces), that the resultant forces wll be applied at the right DOF of the flexible body...?
Maybe I need to adapt the FE model according to Adams' needs..
Yes, I know where it is. From my adm-file, a typical interface marker is listed as:
! adams_view_name='ipr_interface_j_1'
MARKER/431
, FLEX_BODY = 1
, NODE_ID = 2
, QP = -575, 484, 22.89999962
So belonging to FLEX_BODY_1 and on NODE_ID =2
So I don't understand what you looked at when you say that it is not listed in adm or cmd files. You can also use the interface and the marker should be "Located at Node"
Yes, you are absolutely right about the .adm-File. I just got lost in the test model file I created... Thats why naming is so important :/
The question came up when I started creating .cmd-scripts for automated modeling steps. So when I create markers for specific modeling elements, like forces or constraints, I usually create new markers on those parts defined basically by.
part
location
orientation
For the location I use loc_relative_to , for orientation ori_relative_to. For me it was not intuitive that this means that the elements are finally connected to that particular node.