How to find the natural frequency in ansys apdl

[dhirendra pandey]

Hi! I am new in ansys. I am doing rotor dynamic study of a high speed rotating shaft. the shaft comprise of two discs and at the it ends the shaft is supported by the bearing I am facing problem in modelling stage please tell me how to model the bearing and disc briefly.I am uploading the image and these are the dimension.Please Do reply.

Diameter of disc 1 = 0.28m
Diameter of disc 2 = 0.35m
Diameter of shaft = 0.05m
Length of the shaft = 1.5m
Thickness of disc 1, disk 2 = 0.07m
Modulus of Elasticity = 211 GN/m^2
Modulus of Rigidity = 81.2 GN/m^2
Density = 7800 kg/m^3
Speed = 4000 rpm
Bearing stiffness = 1 MN/m

 

[Mech_Engineer]

It isn't realistic to expect an online forum to teach you how to use a complex program like ANSYS, there are just too many considerations. Are you taking a class in FEA and its usage? Have you found any tutorial materials regarding setting up a rotor dynamics simulation in ANSYS?

 

[dhirendra pandey]

It isn't realistic to expect an online forum to teach you how to use a complex program like ANSYS, there are just too many considerations. Are you taking a class in FEA and its usage? Have you found any tutorial materials regarding setting up a rotor dynamics simulation in ANSYS?

I am a M.Tech student and yes i have taken the FEM classes and i am using ansys help as a tutorial and I am using APDL but there is problem in the modelling phase the results are not matching with the theoretical result pls help me.