Assemblies and Connections in Pro/Mechanica

[RaceMaster]

Help. I'm new to Pro/Mechanica. I have a simple three part assembly (yes, with small gaps) of a driveshaft, a-symmetric U-joint, and Flange. I placed connections btw all the parts, the flange is rigid, and a torque is applied at the drive shaft. Everytime I run a study (static), I get an error about improper constraints.

What am I doing wrong?

FYI: I'm running this in the intergrated mode.

What is the right way to handle an assembly?

 

[Twoballcane]

Well first, what are you trying to analyze? The drive shaft? If so, just bring in the drive shaft and constrain the end of it and then applie the torque. You know once you do that you have to do some hand calcs to make sure you have the right numbers.



Tobalcane
"If you avoid failure, you also avoid success."

 

[RaceMaster]

I'm trying to analysis the U-Joint and the driveshaft. because of it's unique connection feature I'm not sure what will fail first. Stress and the deflection are both critical. (It's tapered also, so deflection will determine if the connection will dislocate as well).
I'm confused how Pro/E handles connections when you bring in an assembly into Pro/mech.

 

[Twoballcane]

Hi RaccMaster,
In assembly put the drive shaft into the u-joint, proM will see this as one part so you don't have to define a conneciton between the u-joint and drive shaft. Bring that assembly into ProM. Constrain the u-joint at the pin holes. Apply a torque at the end of the drive shaft. Once you run it, you have to determin what are the stresses and then calc the factor of safty and see what you can live with. Pro M will not tell you if the part will fail or not, but if you want to go into the plastic state you can.

good luck!

Tobalcane
"If you avoid failure, you also avoid success."

 

[seymours2571]

Hey RaceMaster,

Create a modal analysis, convergence set to quickcheck, and look for the first 10 or so modes. Make sure you run the analysis with constraints had the "rigid mode search" checkbox enabled.

During post processing with animated results, the rigid body motion will become obvious.

Good luck,

Steve