cracked rotor

sir

can i find natural frequencies of cracked rotating shaft in ansys.i am using contact elements to model crack due to which nonlinearity comes into picture.since modal and harmonic analysis cannot solve nonlinear problems,so please tell me in detail the steps to find natural frequency .

my project submission date is on 15th june and i have no results.pls reply as soon as possible

it will be yr great help.

thanks in advance

pushpendra

iit roorkee