Dynamic Simulation- Over Constrained

[karthur1]

I have a DS that is giving me the "over-constrained" error.  I cant figure out what I need to do.  Tried all sorts of joints, but nothing I tried has worked.  One problem that I am having is the clevis needs to stay in-line with the cylinder rod through out the travel.  There is a Insert:3 constraint that does this, but when I go to DS, I get the over-constainted error.  If I suppress it, then try to add joints in DS, I still get the over-constrained error.  When you drag the clevis in DS you can see how the clevis stays in line with the cylinder. But, with the over-constraint, the output grapher wont run.

Also when I run the simulation, I would like the clevis to move only .75 in from the cylinder to simulate the stroke.

I am trying to determine the force on the cylinder thru its range of motion.  I have calculated this by hand so I know what it should be at certian points.

Thanks,

Kirk

[JDMather]

Have you installed all Service Packs and Updates for 2015?

[karthur1]

Currently at Build 223, Release: 2015 SP 2, Update 2

[JDMather]

Have you saved all of your parts since the Updates?

Some of your iProperties would seem to indicate - no.

[JDMather]

Am I missing something?

How can this assembly possible work?  The hydralic mechanism is one part?  No translational motion of the piston rod possible?

[JDMather]

Maybe something like this is what you are after?

[karthur1]

I realize there is no rod there.  I didnt think it was necessary.  I thought that I could use a constraint/joint to simulate it.  It looks like you made several changes to the constraints in my model... just so that it will work in DS I suppose.

I'm just having a hard time understand the joints and how to apply them. What I don't get is how my mechanism works in the model, but then when I take it to DS... it fails. 

How do I simulate the cylinder stroking out/in and graphing the resultant force at the end of the arm?