Relative Rotation

[kerby43]

This problem should be relatively easy to solve, but somehow I'm struggling.

Essentially I have 2 cylinders connected by a plate. One cylinder is fixed in all DOF, the other is rotated axially. I want to know the relative rotation between the ends of the 2 cylinders.

Two questions:

1) My first idea was to connect a joint or spring between the two ends in WB, and then find the rotation with the "joint probe" function.
I get an error: "At least one contact pair has no elements in it. Set the variable contactAllowEmpty = 1 to allow solution to proceed"...
I've tried setting this variable under Tools -> VariableManager and with the commands function, it hasn't changed anything.

2) Perhaps there is a simpler way to calculate this?

 

[bagarbilla]

What do u mean by relative rotation ?
As one of the cylinder in constrained to all DOF how can it rotate ! ..

 

[kerby43]

oops, silly me... one cylinder is fixed in all DOF except x and y rotation... the other is rotated axially

 

[Transient1]

Uh....well what is reality? How are the two cylinders connected?

 

[SFLM]

Hi Kerby43,

1) The only way to help with this is by seeing your model.

2) If you have ansys V12 you can perform result calculations (User Defined Results). If you don't, read the rst file in ANSYS classic and perform the calculation there. For instance: rotation of B minus rotation of A.

Steve