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jwalch99
Posts: 6
Registered: ‎01-21-2014
Message 1 of 10 (223 Views)

Export from Simulation to FEA

223 Views, 9 Replies
01-27-2014 01:25 PM

I have a working simulation from which I want to export the dynamic forces to analyze the supporting frame.  I get the message attached stating that the sub assembly needs to be flexible.  This is a sub assembly made up of parts, and I have tried setting it to flexible, but I get the same message.

 

What am I missing here?

 

Flexible.JPG

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JDMather
Posts: 26,169
Registered: ‎04-20-2006
Message 2 of 10 (221 Views)

Re: Export from Simulation to FEA

01-27-2014 01:30 PM in reply to: jwalch99

Can you attach the assembly here?

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Active Member
jwalch99
Posts: 6
Registered: ‎01-21-2014
Message 3 of 10 (191 Views)

Re: Export from Simulation to FEA

01-28-2014 06:31 AM in reply to: JDMather

Actually, I cannot.  With the sim, it is 162mb zipped up.

 

 

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JDMather
Posts: 26,169
Registered: ‎04-20-2006
Message 4 of 10 (180 Views)

Re: Export from Simulation to FEA

01-28-2014 08:42 AM in reply to: jwalch99

I suspect that you are including a significant amount of geometry in the simulation that doesn't have anything to do with the target information. 

 

Can you not simplify?

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rfeijen
Posts: 24
Registered: ‎03-23-2012
Message 5 of 10 (169 Views)

Re: Export from Simulation to FEA

01-28-2014 12:08 PM in reply to: jwalch99
Close Dynamic Simuaktion environment. Make the assembly Inventor complaining about flexible. Go back to the Dynamic Simulation environment. Select Export to Fea, before you run the Simulation. Than run the Simuaktion. That should work. If not try posting your assembly using WeTranfer.com and send it to yourself. Copy the link from the WeTransfer email and post it here. Normally the WeTransfer link status valid for two weeks. That should be long enough.
Roelof Feijen
_______________________________________________________________________________
Product Design Suite Ultimate 2015| Simulation Mechanical 2015 | Simulation CFD 2015
Autodesk Inventor 2014 Certified Professional | Autodesk AutoCAD 2014 Certified Professional
Active Member
jwalch99
Posts: 6
Registered: ‎01-21-2014
Message 6 of 10 (161 Views)

Re: Export from Simulation to FEA

01-28-2014 01:27 PM in reply to: rfeijen

I did not get the Export to FEA to work, and I remodeled the assemblies as parts to try to eliminate the problem.  Now I have another recurring problem:  "Please check joints' nature and geometry".  Maybe someone else can help me identify the problem.  This simulation is driven by the profiles on the two upper joints.  There is a joint on the lower pusher face that applies a force to the face of the pusher.

 

I appreciate any help with this.  The dynamic simulation tool has proven to be quite painful to work with, and unfortunately our local Autodesk supplier knows nothing about it.

 

Thanks, Jared

 

Nature.JPG

 

 

The assembly is on WeTransfer: 

https://www.wetransfer.com/downloads/565f58eda5ba750f2529ab9a823f9b9620140128203934/53e885393cddedb2...

Contributor
rfeijen
Posts: 24
Registered: ‎03-23-2012
Message 7 of 10 (130 Views)

Re: Export from Simulation to FEA

01-29-2014 07:06 AM in reply to: jwalch99

Hello Jared,

 

Suppress the Flush:135 under Planar:14. Run the Simulation.

The whole mechanism turns 180 degrees.

Unsuppress Flush:135

 

Change the Imposed Motion:smileytongue:ositon in Revolution:11. Select Y1 with your Roght Mouse Button and select Initial Position. Same for Y2.

 

DSInitialPostion.PNG

Repeat teh same stepr for Revolution:4.

 

Your simulation will run, but you still have to figure out the imposed motions in both revolutions. I think you are trying to make a motion that is reality impossible to make.

Roelof Feijen
_______________________________________________________________________________
Product Design Suite Ultimate 2015| Simulation Mechanical 2015 | Simulation CFD 2015
Autodesk Inventor 2014 Certified Professional | Autodesk AutoCAD 2014 Certified Professional
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JDMather
Posts: 26,169
Registered: ‎04-20-2006
Message 8 of 10 (116 Views)

Re: Export from Simulation to FEA

01-29-2014 10:40 AM in reply to: rfeijen

For anyone interested -

I haven't had my students take a look at this yet, but here are the files.

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Contributor
rfeijen
Posts: 24
Registered: ‎03-23-2012
Message 9 of 10 (108 Views)

Re: Export from Simulation to FEA

01-29-2014 11:14 AM in reply to: JDMather

Maybe something to consider.

Get rid of the Imposed motion in both Revolutions 11 and 4.

Add a Spatial Joint between the paddle and the frame.

Describe the motion in de Spatial Joint using the positions X,Y,Z directions.

Roelof Feijen
_______________________________________________________________________________
Product Design Suite Ultimate 2015| Simulation Mechanical 2015 | Simulation CFD 2015
Autodesk Inventor 2014 Certified Professional | Autodesk AutoCAD 2014 Certified Professional
Active Member
jwalch99
Posts: 6
Registered: ‎01-21-2014
Message 10 of 10 (99 Views)

Re: Export from Simulation to FEA

01-29-2014 12:12 PM in reply to: rfeijen

A spatial joint does in fact work.  In fact a spatial joint was used to create the original motion.  The output data from the revolving joints was then saved, and was imported back in as an imposed motion curve (inverse kinematics)  I did have this working at one point.

 

It is important for this analysis to impose the motion at the revolving axis, since the forces and moments we need to look at are what is generated by the motors and gearboxes at these joints.  I did get a nice plot of this data when it was working, but now I need to review the supporting structure with FEA.

 

First I was not able to export my results to FEA, and now I also cannot get the simulation functional again.  I will probably go back to an older version of the simulation that was functional and retrieve the forces manually to run the FEA.  The vague errors and lack of troubleshooting tools has been a disappointment.  There is definite opportunity to improve this tool.

 

Thanks,

Jared

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