Regarding the increment of natural frequencies in prestress analysis when bonded conn
 

Hi all,

I am performing a prestress analysis on a rotating wheel with fixed condition at center and rpm as load condition. In the problem, I defined the same bonded contact 2 times with shell thickness effect using MPC formulation in ansys software. I observed the increment in frequencies.
Q. What could be the reason behind the increment in frequencies.please let me know the reason with explaination.

Thanku all for the support.