Global-Local Modeling RBE3 Elements

Burner2k

Is there a tool in HW to automatically model RBE3 elements from target nodes to source nodes while creating a GFEM-DFEM (Breakout/Local modeling) model? 

cfree

Connectors work pretty well for this.

https://www.youtube.com/watch?v=rt4aPzWophw&list=PLGNemB0NFb0C_SyFVrdD9d0WZEr1aUiP3

You could experiment with the "rbe3 (load transfer)" control to make RBE3 elements where you want. Also, tie/freeze contact works pretty well for making connections between parts.

Michele Macchioni

Suggest to look as well to the sewing tool under the aerospace menu

Burner2k

Folks,

Thanks for your replies. I know my issue ain't new...been done to death. 

Basically, I want to transfer forces/displacements from Global (top) to local (bottom) model. The red arrows are RBE3 elements to distribute forces to refined model. Actually I have a couple of questions on the procedure involved. In my case, the local geometry has more details that global lacks. Typically we bring in our local geometry from CAD. 

1. Any good way to preserve the global node locations on edges where loads/displacements need to be applied. One can create points (from nodes) and/or project nodes on to the edges of local model. Any other ways to accomplish the above?

2. I tried connectors & Aerospace->Connections-Sew in both cases, I am not getting desired results. I am creating RBE3s manually for now (since I have lots of time) but the hope is to find a method to do it automatically as the complexity of model increases & time constraints start kicking-in

Again, I really appreciate the replies folks. 

cfree

Some thoughts for consideration are below.

1. In the new interface there's a couple tools that might work well for this. "Imprint" can create fixed points on a surface from a selection of nodes. In this way there will always be nodes there when you mesh the surface. This is basically the project method but quicker.

2. I'm blanking on automated ways to create RBE3 elements like the above, but maybe a field entity could be used instead? You can use fields to take a given selection of loads (from the global model) and apply them to a new set of nodes (on the local model). If you map using force balance then the total force will be equal and optionally you can react induced moments as well.

Burner2k

Christrian Free, thanks for the suggestions. I had not looked in to Imprint Command. Will do so tomorrow. 

I think my 2nd try was using Fields. We don't have Optistruct solver, so I could not get "forcebalancing" option to work. My solver preference is set to MSC Nastran. I did try other options (proximity, linear interpolation) etc., but the force distribution always was not correct. In the figure of global model, lets say the force distribution is (2.5 5.0 2.5) units (left to right) and when I realize using fields, in the node 2nd from left (in local model), I get a load of 2.5+5.0...perhaps I am doing it wrong and like I said, global-local modeling ain't nothing new...its just that the procedure is new to me in HW. 

Burner2k

So, I have a bunch of questions on new HW...

1. Is there any option to create "Planes" in Hyperworks? I want to create a plane which has an offset of 1000 mm from global XY plane and use it as a support for creating a sketch. Not able to find a way...I don't know why but my Sketch creation icons are greyed out even if I select a planar surface. 

2. I understand Imprint is the replacement for the old project tool but I am not able to imprint/project elements from one surface on to another. The target surface is blank but I believe HW is expecting source elements to be present. I am using Elements -> Imprint. I looked under the tool options but I could not figure out how to make it work. Basically I want to copy elements from one surface to another. 

3. There was a dedicated command on HM called Count which could be used to get more info on entities. Any such command is available in new HW?

4. I am assuming Aerospace -> Connections -> Sewing Tools is the replacement for Linear 1D mesh? I need a quick way to connect a bunch of 2D elements on two surfaces by 1D elements

Thanks in advance...

 

 

Adriano_Koga

Burner2k said:

So, I have a bunch of questions on new HW...

1. Is there any option to create "Planes" in Hyperworks? I want to create a plane which has an offset of 1000 mm from global XY plane and use it as a support for creating a sketch. Not able to find a way...I don't know why but my Sketch creation icons are greyed out even if I select a planar surface. 

2. I understand Imprint is the replacement for the old project tool but I am not able to imprint/project elements from one surface on to another. The target surface is blank but I believe HW is expecting source elements to be present. I am using Elements -> Imprint. I looked under the tool options but I could not figure out how to make it work. Basically I want to copy elements from one surface to another. 

3. There was a dedicated command on HM called Count which could be used to get more info on entities. Any such command is available in new HW?

4. I am assuming Aerospace -> Connections -> Sewing Tools is the replacement for Linear 1D mesh? I need a quick way to connect a bunch of 2D elements on two surfaces by 1D elements

Thanks in advance...

 

 

a couple answers:

 

2) in 2022.3 the project tool is back, now in the upper menus

 

4) have you tried connectors for that? https://community.altair.com/community?id=community_blog&sys_id=ff7e1506db1d3c10e8863978f4961936&view_source=searchResult

cfree

Burner2k said:

So, I have a bunch of questions on new HW...

1. Is there any option to create "Planes" in Hyperworks? I want to create a plane which has an offset of 1000 mm from global XY plane and use it as a support for creating a sketch. Not able to find a way...I don't know why but my Sketch creation icons are greyed out even if I select a planar surface. 

2. I understand Imprint is the replacement for the old project tool but I am not able to imprint/project elements from one surface on to another. The target surface is blank but I believe HW is expecting source elements to be present. I am using Elements -> Imprint. I looked under the tool options but I could not figure out how to make it work. Basically I want to copy elements from one surface to another. 

3. There was a dedicated command on HM called Count which could be used to get more info on entities. Any such command is available in new HW?

4. I am assuming Aerospace -> Connections -> Sewing Tools is the replacement for Linear 1D mesh? I need a quick way to connect a bunch of 2D elements on two surfaces by 1D elements

Thanks in advance...

 

 

Having a go here again

1. Plane entities don't exist yet, but they may in the future. I'm not sure why your sketch tools are greyed out, the intended functionality of these tools should work. You can create a new sketch from the XY plane and offset it some distance, then get to sketching. If surfaces exist in the model, these can form the sketch plane instead.

2. Adriano is right here that the new Align/Project is good for this. Free morphing to a target surface might also get the job done.

3. I see Count in 2022 but I do not see Count in 2022.3. It strikes me that most (if not all) of its functionality is replaced by the number of entities shown by each entry in the model browser.

 

Burner2k

The new client that we're working for is using Hyperworks 2022 version

If I enter Sketching mode, then the existing Geometries (CAD import and others) are not visible...plus the Sketcher grid box (outside box) is constant when zooming in or out. It would be useful to do design mods on the fly but for that visibility of existing Geometry is a must. I've looked around in Preferences but hoping that I've missed out on an option or something.

cfree

Burner2k said:

The new client that we're working for is using Hyperworks 2022 version

If I enter Sketching mode, then the existing Geometries (CAD import and others) are not visible...plus the Sketcher grid box (outside box) is constant when zooming in or out. It would be useful to do design mods on the fly but for that visibility of existing Geometry is a must. I've looked around in Preferences but hoping that I've missed out on an option or something.

I'm not aware of a way to make geometry visible in the sketch edit view. Intersect/project could be used to get reference geometry. If you want to stay in the Altair toolset, Inspire is probably better for viewing the CAD while sketching.

Burner2k

Where do I find the washer split tool in the new UI?

cfree

Burner2k said:

Where do I find the washer split tool in the new UI?