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[sebasanchez2019]

Hi everyone, right now I'm working on a F.E.A of a thrust roller subjected to loads exerted by a rotary kiln. For the analysis, I just modelled the thurst roller along with the tyre connected to the rotary kiln . Sadly, I can't get the simulation to work because i'm really having a bad time configuring the boundary conditions. Here is a picture of the geometry:

The rotary kiln rotates at 1.85 RPM and the thrust roller is subjected to a force of 40 KN in the axial direction of the rotary kiln (Z). I planned to use a body-ground joint (with free displacement and rotation in the Z direction) on the tyre with a rotational joint load of 1,85 RPM and a force joint load equal to 40 KN, and other body-ground joint on the thurst roller with free rotation in the Y direction according to the next picture.

I selected those surfaces because those are the zones where the bearings of the thrust roller shaft are installed.

I also added a frictional connection between the roller and the tyre. My idea was to apply the 1,85 RPM rotation and the 40 KN force on the tyre. The force would be transferred to the thrust roller and, due to the fricctional contact, it would also rotate. I programmed it this way because i wanted to obtain the stresses present in the thrust roller as it rotates, sadly I always obtains errors and the simulation never works

I tried with other B.C but the stresses calculated never make sense. For example, I added a remote displacement in the thrust roller and the maximum stress obtained was arround 200 MPa with a force of 1 KN. ¿Could anyone help me with the constrains? I did a course of F.E.A in my university but honestly, they taught us very basics things.

Sorry for my bad english, I'm from Chile, thanks everyone

[harshvardhan.negi]

Hi,
From the error message you have shared, I can assume that the problem might be that the model is not fully constrained in every direction and is experiencing a rigid body motion.

It might be helpful if you could check out this course from the AIS:
Structural Boundary Conditions | Ansys Innovation Courses

I hope this helps.

Regards,
Harshvardhan
Ansys Help
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[sebasanchez2019]

Thank you very much, I'm going to study that course right away