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Anyone has used ansys to simulate bearing in dynamic condition?

Anyone has used ansys to simulate bearing in dynamic condition?

Anyone has used ansys to simulate bearing in dynamic condition?

(OP)
Hi, is there anyone has tried use ansys to simulate a bearing? I met converge problem and hope somebody can help me. Thanks.

RE: Anyone has used ansys to simulate bearing in dynamic condition?

Your post is way to vague. You need to actually describe what you did and what happened.

Rick Fischer
Principal Engineer
Argonne National Laboratory

RE: Anyone has used ansys to simulate bearing in dynamic condition?

(OP)
Hi Rick,

I found it is really hard to set the contact between ball and cage,inner race,outer race. I set the contact between ball and cage is frictionless.The interface treatment is "add offset and ramp effect". The contact between ball and ring is frictional with a small frictional coefficient. Treatment is "adjust to touch".These nonlinear contact can bring a lot problems. I do a modal analysis and cage flies out. Do you have ideas to solve it? Thanks.

RE: Anyone has used ansys to simulate bearing in dynamic condition?

I don't think you can do a modal analysis in Ansys on a nonlinear model. The cage flies out because the nonlinear contact elements are not recognized by the linear modal solution, so the cage is unattached. I'll bet you have a lot of zero frequency modes. I think the usual way to do modal on an assembly containing a bearing is to model the stiffness and damping with a dampened spring. Workbench has a bearing element that does that. Search the Mechanical Applications Manual in help for bearing.

Rick Fischer
Principal Engineer
Argonne National Laboratory

RE: Anyone has used ansys to simulate bearing in dynamic condition?

search for other scientific papers, you are not the first with that task.

RE: Anyone has used ansys to simulate bearing in dynamic condition?

(OP)
I have searched for a long time. But I didn't find any papers that have done a modal analysis for a bearing(or rotor-bearing system) in ansys workbench.Can you show me one?Thanks.

RE: Anyone has used ansys to simulate bearing in dynamic condition?

You're not trying very hard. I found these in the first ten hits on a google search for "rotordynamics ansys"

www.mecheng.osu.edu/documentation/Fluent14.5/145/a...
https://www.civ.cvut.cz/.../ansys.../RotorDynamics...
www.ansys.com/.../AA-V4-I2-Turning-to-Rotordynamic...
www.ewp.rpi.edu/hartford/~ernesto/.../Trebuna2011-...
http://www.scribd.com/doc/33750426/Rotor-Dynamics-...

Also, RTFM, as they say. There are sections on rotordynamics in the Mechanical Applications manual and the Mechanical APDL Manual, and a Workbench verification problem at VMMECH087.

Rick Fischer
Principal Engineer
Argonne National Laboratory

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