A traditional practice in the rotor dynamics analysis is to use beam models for both the lateral and the torsion analysis. Such an analysis limits the capabilities for the modern day design of high-speed machinery. The beam type one-dimensional models require good modeling techniques to approximate the three dimensional rotors. An analysis of this type is usually followed for most of the steam turbine and compressor rotors. The accuracy of the beam modeling analysis is limited to how best the mass and stiffness terms in the system are captured. For a complex geometry such as that of the rotor, it is difficult to accurately capture these terms in the rotor dynamics beam model. Solid model rotor dynamics provides an accurate solution for such problems.