Structural prestress analysis on a rotating wheel fixed at center with rpm as load co
 

Hi all,

I am performing a prestress analysis on a rotating wheel which is fixed at center having given rom as load condition. I performed the same problem using 2d shell elements and 3d-solid elements separately with all the analysis details same materials, contacts . I observed high frequencies in 3d solid elements case.
Q. Is my observation is correct?
Q. If my observation is correct, what could be the reason for the high frequencies in Solid elements case compared to 2d shell
Q. How can we correlate both the results. Is there any defined explaination behind this.
Please let me know the reason . I thank all for the support. Expecting an explaination for the defined problem.
Thanku all

Thanku for the reply but I cannot show u the geometry or mesh or related becoz it is my office problem being confidential . Hope u understand . I am really sorry

Sorry, no info - no help.
In general if structure can be considered as thin walled and if it meshed, loaded and constrained in the right way then result modes will be almost the same. But "right way" is too complex to write it on a forum. There are many possibilities to make something wrong.
Therefore the answer to your first question is no, your observation isn`t correct. Modes should be similar.

I agree to ur point . Mode shapes are same . I observed that frequency numbers are high . Difference in frequency numbers between the shell and solid mesh is 2Hz

First frequency in shell is around 14.5 Hz whereas in solid mesh it is around 16.5 Hz

~15% relative error. It is not small but also not giant.
I can recommend to perform mesh convergence study - reduce alement size and recalculate model until mode frequencies and shapes stop changing.