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run- up analysis-rotordynamics-ansys

Dear all,

I want to do a run- up analysis for a rotor in ansys. The rotational speed change from 0 to 5000 rpm

In ansys help is explained:

nlgeom,on !! so that the gyroscopic matrix is updated

But because my model has Combin214 element, the nlgeom make error and solve dont run.

when I remove combin214, I dont get error.

I changed combin214 with matrix 27 but same problem.

In an example in ansys is used combin14. but my model is 2-D axisymmetric analysis and I think combin14 in not good element for modeling bearings.

mesh free +orthogonal transform method +free vibration

Hi

I want to impose SS-F-SS-F or F-F-F-F for boundary condition of rectangular plate with element free galerkin method and with

ortogonal transform method(G.R Liu and chen 2001) for imposing B.c. 

How can I do that?

for F-F-F-F how can I impose B.c? when I do nothing for imposing B.c ,I will have 3 extra natural frequency

the first complex and second and third near zero. how can I solve this problem

thanks

vielen dank

Ali 

Extended kantorovich method

Hallo every body,

who knows about Extended kantorovich method?

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