Good Day All,
I hope I'm missing something, Are we restricted to 8 frames of animation in the results window?
I'm trying to animate the results from an static Creo 2 Simulate analysis (mechanica) run on a assembly.
When I go to set up the number of frames it only allows 5 frames, no more and no less than 8.
Anyone else run into this?
Thanks,
Don Anderson
hi all
What value can be used for coefficents of friction (static and kinetic) and restitution in dynamic analysis.Does it depends on rpm.Also suggest a book if it has addressed such question.Thanks
I am trying to mesh two spur-type gears and, instead of using just the rotational relationship generated by the 'gears' feature in Mechanism, I am trying to set up cam followers between the mating teeth so that the teeth move only when contact occurs. Trying to get the most realistic reaction forces that I can at the supports of this gear train for structural FEA on a housing that these gears ride in--and I wasn't sure if the 'gears' feature in Mechanism will appropriately capture that.
Initially this worked pretty well and there was little penetration of the parts. Running a Dynamic analysis with a force motor or servo motor driving the assembly I got decent results for about half of the run--for the other half of the run the gear teeth spun through each other. Now, for whatever reason, the gears will turn through each other and only occasionally and briefly hang with the surfaces that are supposed to remain in contact. Any ideas or experience with this?
Hello Everybody,
I am working with Pro mechanica, I am seeing singularity in my results. what is meant by singularities? It's the peak stress as for I know, but still I could not understand exactly. Can anyone give me a clear vision to that.
Hi!
Does anyone know how to define motors and measure Lifting and "draging" force?
I know how to add servo and external load to tip of the telescope and measure required cylinder forces but how to do it vice versa. I can do it in stationary state when I fix the tip of telescope and add cylinder forces. Worst thing doing it this way is that I have to create multiple analysis. Cylinders must act in certain order and velocity is constant → velocity and trajectory of the tip is known. Static results are enough in this case.
Attached picture is a simplyfied case of my mechanism. Actual mechanism contains parallel mechanism (4bar link) but the procedure is the same.
Hello,
May be it seem very easy task to do but beginner like me in Creo 2.0 need your help.
Please if anyone knows how I can measure torque, when apply force on leaver arm.
I am sure there will be a very straight forward way to do it so please help me.
Actually I want to simulate for a 4 links robotic arm with 4 rotational joints and I want to know if robotic arm lift 2 kg load from robotic arm end-effector then how much torque I need to has for my joint actuators. Will Static and dynamic analysis help me?
Please answer me or refer me to any document or tutorial.
Looking forward for your help
Why it takes too much time to run an optimization study while the design variable is only one and the problem is simple.I have run a static anlysis of a gear and i now i want to minimize its mass by optimizing it thicness.It has been 24 hours of running and still no results.I think it should take time but not this much time as the problem is not complex.what can be the possible cause?
I am simulating a scenario where 2 parts are touuching and one is made of a hyperelastic material, hence i can only run it contact.
- When I run it with 2 Output time steps (0-1), the solution converges (Single Pass) and I get some results.
- When i take the same run, and increase the output to 5 time steps, the solution always terminates because it fails to converge at a load factor less than 1.
Can someone pleasae help? How can the solution converge in the first case, but not in the second? Any guidance is appreciated. (If it helps, I also added a lot of mesh refinement points in he contact region and raan the 2nd analysis again and it still failed.)
Hi,
Two questions, the second resulting from the first.
Thanks
1. Has anyone/can anyone share their experience of scanned component data - Real reverse engineering?
Any links, contacts, papers, methodologies,,,
This is new-ish territory for us; previous experiences have been with simple componenents which are easliy remodelled, a process that generally resolves all issues.
We thought we would investigate 'proper' reverse engineering data so had a moderately interesting steel casting scanned and delivered as 'watertight' surfaces in a number of forms. NURBS, .stp, .igs. to begin to understand what the real issues are including that nothing is either cylindrical or flat (even though it's machined) and so shafts and holes (contact) become interesting problems ... even a simple 'flat' plate bolted interface is an interesting contact problem.
.igs and .stp are non-starters. Thousands of surfaces when we get them to load.
NURBS - Slow to load/spin (lowest quality shading) and Mechanica (Creo) mesher continuously gives the message 'singlular mapping'. Chasing one down, appling mesh controls leads to the next. Sometimes and assembly will mesh, but with a simple change of component (all other components are native pro/e) the assembly will produce more meshing errors.
Contacts disappear, the definition of the contacts are in the model and can be editied but those analyses that run fail insufficiently constrained with no contact measures reported.
Pro/e crashes regularly at the most obscure moments. msengine terminates regularly with no error logs.
I conclude that there is a lot we don't understand and that this is not limited to the pro/e end of things; it must include the scanning and methodologies employed in the processing of the scanned data.
2. Singlular mapping element - what is this and what causes this? I have avoided the question so far by knowing adding autogem controls and/or modelling over the top usually makes the problem go away (we have to be practical).
Is there a way in Mechanica/Simulate to write custom programs (like you can with FEMAP's API or ANSYS' APDL)? If there currently isn't, can anyone from PTC comment on whether this functionality could be supported? I think there could be some real value in allowing users to create custom tools via programming to help stream-line processes (like the fastener tool in Mechanica for exmaple), and being able to share with them other users.
Rotation Constraints are greyed out in Creo 2.0.
I am unable to create rotational constraints for a assembly model which I am working.
Anybody facing this issue?
Can you design devices for balistics?
Okay, so this is just not realistic, but I want an HTC phone.
This phone survived a bullet! Who could have ever designed for this...
Hi ,
Version: Creo 2.0
perhaps this is a common problem in FEA models - I'm having trouble properly properly defining the rotational constraints in a model and I'm getting strange results because of it.
I would like to model a steel plate constrained with a pin joint on either side.
The plate should be loaded centrally with 5000N. (see pictures in Excel table).
What i expect to see is that the plate bends upwards in the middle and is free to rotate on either side until the plate comes into tension and holds the load.
The intention was to make a simple model to see if it behaves as intended and then i would use the same method on a more complicated assembly model.
I've ignored the stress levels at first and only looked at the displacements to see if the model is behaving as intended.
i've tried the following and none seem to give the right model behaviour:
The problem i see is that the pin/ball constraints seem to fix the edges and don't allow free rotation aroung the selected cylinderical surface as intended.
I thought the Cylindrical coord. system might work but it seems like i can allow any amount of rotational freedom and the resulting deflection just keeps on increasing with no end in sight.
would be great if someone had some more insights here - it doesn't seem to make sense.
Thanks,
Dermot
Good Day all,
Has anyone run into the following message while running an analysis on an assembly with one component containing hyperelastic properties?
*** Decomp. Singular Stiffness Matrix. Recovering...
Thanks for any ensight you can provide.
Don Anderson
Begin Displacement and Stress Calculation
Tue Oct 29, 2013 08:48:18
Begin Reaction Calculation
Tue Oct 29, 2013 08:48:20
Begin Time Step 9 of 15: 6.00000e-01
Tue Oct 29, 2013 08:48:20
*** Decomp. Singular Stiffness Matrix. Recovering...
Iteration Residual norm
------------- -------------
1 1 Tue Oct 29, 2013 08:48:40
Load Factor: 0.566667
*** Decomp. Singular Stiffness Matrix. Recovering...
Iteration Residual norm
------------- -------------
1 0.0560233 Tue Oct 29, 2013 08:49:04
Load Factor: 0.55
*** Decomp. Singular Stiffness Matrix. Recovering...
Iteration Residual norm
------------- -------------
1 0.0480005 Tue Oct 29, 2013 08:49:27
Load Factor: 0.541667
*** Decomp. Singular Stiffness Matrix. Recovering...
Iteration Residual norm
------------- -------------
1 0.0469847 Tue Oct 29, 2013 08:49:49
I've been trying to run a simulation on a frame and it keeps failing. It says in the log
AutoGEM has detected an element incompatibility across the
highlighted curve. Adding points to the curve may help.
In some cases, re-creating the curve and adjacent
surfaces may be required.
but I can't see anything highlighted.
In the log it also says:
The highlighted geometry may cause meshing problems.
Creo Simulate has placed this geometry in the group "agem_bad_geom".
All problematic geometry is automatically placed in this group.
I don't know where this file is. Any help would be greatly apreciated
Tony Flores
Hi all
i would like to know how to create a planetry gear reducer.I have modeled all the parts but their mechanism gives problem.
Scenario is that i have a planetry gear head with 5 rows of planetry carriers for a reduction of 1:625.each row has three planetry gear.
Now i have made a sub assembly of Sun gear,planetry gear,and planetry carrier and the gear connection between sun and planetry are correct
BUT the gear connection between the RING gear and the PLANETRY gear is not successful.
NOTE:RING gear is stationary part.
Kindly tell me proper method of correcting these connection.or refer me to some tutorial regarding this issue.
If someone have Planetry gear asembly.kindly email it to davidrifat@yahoo.com so that i can see the mechanism in action and reverse it to correct my own.
Dear all,
Is there any option to analyse components made up of plastic materials (e.g pp,30%gf pp, Acetal, Abs) for fatigue failure. Can you please give more details to perform a fatigue analysis for plastic parts using Creo simulate 2.0?
Regards,
Shivaprakash
Just starting on Creo 2.0, and when I save a part (or assembly) I get the following conflict window pop up:
"Mass properties are not calculated"
Now.... I know what it means 
The trouble is I have not created a mass properties feature or a saved analysis and I currently have no need or desire to calculate the mass properties of my part. I have to check this box off every time I save a file.
Does anyone know how to get rid of this?
"X-axis direction of the local beam coordinate system has changed."
I continue to get this message, and I don't know how to fix this. Any professional help would be welcomed.
Thanks,
Ali