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by mfasano
Wed Feb 24, 2021 11:12 pm
Forum: FEM
Topic: FreeCAD as pre-post processor for MBDyn
Replies: 327
Views: 49548

Re: FreeCAD as pre-post processor for MBDyn

Hi. Can anybody spot my error in the next input file for MBDyn? There are two nodes, one static at the origin and one dynamic at (0.02, 0.02, 0.). The static node is clampped, and both nodes are attached together through a deformable displacement joint. Both nodes are parallel to the global referen...
by mfasano
Wed Feb 10, 2021 1:52 am
Forum: FEM
Topic: FreeCAD as pre-post processor for MBDyn
Replies: 327
Views: 49548

Re: FreeCAD as pre-post processor for MBDyn

Hello Jose, From the mbdyn documentation, the direction of the in line is given by the direction 3 of the orientation matrix. (Sextion 8.12.25) And the orientation matrix can be defined as Dir1,x,y,z,dir2, guess In this case dir1 should be 3 And x=xp1-xp2, y=yp1-yp2, z=zp1-zp2 And dir2 could be 1 o...
by mfasano
Mon Feb 01, 2021 1:27 pm
Forum: Open discussion
Topic: Google Summer of Code 2021 - Call for ideas
Replies: 78
Views: 9290

Re: Google Summer of Code 2021 - Call for ideas

Besides a 1 month timebox, another main goal of projects is to get students engaged in the community so that they stick around. So, projects should not just be tough things that need a chunk of time to do that weekend contributors can't muster, they should also be educational or interesting to enga...
by mfasano
Fri Jan 29, 2021 3:11 pm
Forum: FEM
Topic: FreeCAD as pre-post processor for MBDyn
Replies: 327
Views: 49548

Re: FreeCAD as pre-post processor for MBDyn

Yes I have also been thinking the total joint would be easier to use, because we would only have to program one scripted object to create a total joint within FreeCAD, and use it to model a wide range of assemblies, however my attempts to do so did not go well. Total joints have more parameters to ...
by mfasano
Fri Jan 29, 2021 2:38 pm
Forum: FEM
Topic: FreeCAD as pre-post processor for MBDyn
Replies: 327
Views: 49548

Re: FreeCAD as pre-post processor for MBDyn

Hi. It is great you were able to reproduce the pendulums! Even considering I still didn´t make a tutorial. One key idea of the working process Is to create simple (non-parametric) parts before you set a simulation. The reason is that I sometimes find problems when obtaining the mass and inertia of ...
by mfasano
Thu Jan 28, 2021 6:31 pm
Forum: FEM
Topic: FreeCAD as pre-post processor for MBDyn
Replies: 327
Views: 49548

Re: FreeCAD as pre-post processor for MBDyn

What do you think about Assembly3? It works quite nice in our production line. Do you think the efforts can be merged (or shifted to Assembly3)? I thought about how to use MBDyn with an assembly workbench that uses a solver. I wondered if it would be easier to use an MBDyn joint element called the ...
by mfasano
Thu Jan 28, 2021 1:28 pm
Forum: FEM
Topic: FreeCAD as pre-post processor for MBDyn
Replies: 327
Views: 49548

Re: FreeCAD as pre-post processor for MBDyn

This is an idea I´ve had in mind for a while. I have seen people struggle to write an assembly workbench for FreeCAD for years. There is assembly 2, but it only works for assembies with few parts and it often cannot solve relatively complicated assembies. Assembly 4 is a nice tool, but the lack of ...
by mfasano
Thu Jan 28, 2021 11:19 am
Forum: FEM
Topic: FreeCAD as pre-post processor for MBDyn
Replies: 327
Views: 49548

Re: FreeCAD as pre-post processor for MBDyn

I tried your workbench and was able to create a single pendulum and a double pendulum that ran the simulation successfully. The animation only worked for the single. Though the code works there are errors generated with many of the commands The error I got trying to animate the double pendulum was, ...
by mfasano
Mon Jan 25, 2021 1:23 pm
Forum: FEM
Topic: FreeCAD as pre-post processor for MBDyn
Replies: 327
Views: 49548

Re: FreeCAD as pre-post processor for MBDyn

I´m glad you were able to run the examples. Yes, I am working on a quick tutorial on how to perform the "free-falling body" simulation first. I think it will be a video tutorial, because it is way easier than a written document and because I am sure the workflow will change quickly as the...
by mfasano
Wed Dec 30, 2020 1:40 pm
Forum: Open discussion
Topic: Using Github to store files
Replies: 5
Views: 342

Re: Using Github to store files

A problem with github for this is you have to download the whole repository; you can't just pick one file.

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