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Unstable Flexible Assemblies

4 REPLIES 4
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Message 1 of 5
exSWX
418 Views, 4 Replies

Unstable Flexible Assemblies

Is there a way to create a more stable flexible assembly?

 

We use a lot of pneumatic cylinders in our assemblies and want to chack range of motion etc.

 

We constantly get errors in the a flexible ssemblies and sub assemblies that do not exist!

 

We can open up any sub assembly, rebuild, and the error dissapears. If we then go back into the main assembly the error dissapears too, then suddenly, we get rebuild errors again for no apparent rerason.

 

This happens over different assemblies on different machines.

Autodesk Inventor 2021
Intel Xeon W3520 @ 2.67GHz
Win 10 Pro
6.7 System Rating
NVIDIA Quadro FX 1800
4 REPLIES 4
Message 2 of 5
blair
in reply to: exSWX

This is always a problem using Flexible sub-assemblies. Sometimes I think it's better to "replace" the flexible subs with constraints with min-max limits. If you go with flexible constraints and contact sets, you can actually move the part faster that IV can calculate the contact sets and pull cylinders apart. Then everything really goes for a dump.


Inventor 2020, In-Cad, Simulation Mechanical

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Message 3 of 5
WHolzwarth
in reply to: exSWX

Lots of similar problems are here, too.

I think, this should be improved without any entry in IdeaStation.

 

Walter

Walter Holzwarth

EESignature

Message 4 of 5
exSWX
in reply to: blair

Hi Blair,

We add the travel dimensions to the cylinder, so it only moves within the stroke limits.

The problem seems to be with Inventors inability to handle the flexibility.

Autodesk Inventor 2021
Intel Xeon W3520 @ 2.67GHz
Win 10 Pro
6.7 System Rating
NVIDIA Quadro FX 1800
Message 5 of 5
jhagarty
in reply to: exSWX

We have the same issues here constantly.  Flexibility seems to work fine then it just starts giving us errors that don't exist.  Once assemblies get larter we seem to start to have issues.  We do the same workflow to correct the error at the subassembly level only to see it reappear once we try to move something.  The functionality definitely needs some bugs worked out.

 

Jim

Autodesk Inventor 2015-64Bit Edition

 

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