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by thschrader
Wed Aug 19, 2020 4:54 pm
Forum: Forum in Deutsch
Topic: Unterstützung bei FEM FC 0.19
Replies: 6
Views: 352

Re: Unterstützung bei FEM FC 0.19

Sorry aber diese Datei läuft gleich mit mit einer Fehlermeldung. 17:50:05 C:\Users\Werner Kluse\Downloads\FreeCAD_0.19.22266-Win-Conda_vc14.x-x86_64\FreeCAD_0.19.22266-Win-Conda_vc14.x-x86_64\Mod\Fem\femsolver\run.py:254: SyntaxWarning: "is" with a literal. Did you mean "=="? if path is "": Kannst ...
by thschrader
Wed Aug 19, 2020 1:58 pm
Forum: Users Showcase
Topic: openstreetmap import with heights
Replies: 18
Views: 1833

Re: openstreetmap import with heights

Wow!
I hope your client is impressed like me... :)
by thschrader
Wed Aug 19, 2020 1:53 pm
Forum: Forum in Deutsch
Topic: Unterstützung bei FEM FC 0.19
Replies: 6
Views: 352

Re: Unterstützung bei FEM FC 0.19

Hi Werner,
probier mal diese Datei:
bimetalFEM.FCStd
(13.2 KiB) Downloaded 15 times
by thschrader
Wed Aug 19, 2020 9:51 am
Forum: FEM
Topic: Balance at the rotation of a table (static analysis)
Replies: 20
Views: 1612

Re: Balance at the rotation of a table (static analysis)

In this case the axis of rotation is obvious. So you can manipulate the fixings/load in such a way, that the z-component is zero. That is the point of equilibrium, where the external load is in balance with the selfweight of the table among the rotation axis. Case a) and b). If I don’t know the anal...
by thschrader
Mon Aug 17, 2020 7:56 pm
Forum: FEM
Topic: Balance at the rotation of a table (static analysis)
Replies: 20
Views: 1612

Re: Balance at the rotation of a table (static analysis)

HoWil wrote:
Mon Aug 17, 2020 6:58 pm
Nice.
But with FEM you will always have to worry if you have made your fixation in a correct way.
...
Yes, thats the problem. My solution is constructed.
Because I know the analytical solution. A fake...
sorry.
by thschrader
Mon Aug 17, 2020 2:34 pm
Forum: FEM
Topic: Balance at the rotation of a table (static analysis)
Replies: 20
Views: 1612

Re: Balance at the rotation of a table (static analysis)

My 2 cent...
Asuming that I dont know the analytical result, I would set a test load (lets say 1000 N) and trigger
this up/down until a point, when there remains a tiny compression sigma_zz in zone A.
At 330 N loading (33kg) I get sigma_zz=-0,106 MPa.
table_tilt.FCStd
(23.63 KiB) Downloaded 17 times
sigma_zz.JPG
sigma_zz.JPG (57.47 KiB) Viewed 500 times
by thschrader
Mon Aug 17, 2020 7:34 am
Forum: Help on using FreeCAD
Topic: Scaling Floorplans
Replies: 4
Views: 319

Re: Scaling Floorplans

Here is a workflow from user freecad-heini-1:
https://peertube.mastodon.host/videos/w ... 6b4ac46123

Voice in german, but video alone should be ok as description.
by thschrader
Sat Aug 15, 2020 10:32 am
Forum: FEM
Topic: Balance at the rotation of a table (static analysis)
Replies: 20
Views: 1612

Re: Balance at the rotation of a table (static analysis)

Hi domad, thanks for your detailed advices to me. Please have a look at your numbers from your first post: 46,59 kg FEM-calculated versus 38,29 kg analytical/graphic gives an error of 22%. Your model reacts super-sensitive to the input: varying the input load by 1 N (0,2 % !) breaks your analysis, y...
by thschrader
Sat Aug 15, 2020 10:10 am
Forum: CfdOF / CFD
Topic: Chip cooling ==> new solver available
Replies: 11
Views: 807

Chip cooling ==> new solver available

There is a new solver for using with the cfdof-wb GUI: buoyantSimpleFoam https://github.com/jaheyns/CfdOF I ran a simple test-case, chip-cooling. chipCooling.FCStd Dependency-checks ok. During calculation, only the k/omega residuals are plotted. I have no experience with buoyantSimpleFoam, comments ...
by thschrader
Thu Aug 13, 2020 4:45 pm
Forum: FEM
Topic: Balance at the rotation of a table (static analysis)
Replies: 20
Views: 1612

Re: Balance at the rotation of a table (static analysis)

Interesting problem.
For me using sketcher and formulating equilibrium seems the fastest and most reliable way.
Does it makes sense to solve a rigid-body problem with FEM, which uses a totally different approach (mesh-deformation)?
table_stability.FCStd
(10.62 KiB) Downloaded 31 times
table_max_load.JPG
table_max_load.JPG (61.23 KiB) Viewed 867 times

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