Abstract—Rotor dynamics is a field under mechanics. Mainly deals with the vibration of rotating structures. In recent days, the study about rotor dynamics has gained more importance within steam turbine industries. The main reason is steam turbine consists of many rotating parts constitutes a complex dynamic system. While designing rotors of high speed turbo machineries, it is of prime importance consider rotor dynamics characteristics in to account. And the world we are living in today is pushing the technology harder and harder. The products need to get better and today they also need to be friendlier to the environment. To get better products we need better analysis tools to optimize them and to get closer to the limit what the material can withstand. The modeling features for rotor and bearing support flexibility are described in this thesis. By integrating these characteristic rotor dynamics features into the standard FEA- modal, harmonic and transient analysis procedures found in ANSYS we can analyze and determine the design integrity of rotating equipment. Some ideas are presented to deal with critical speeds calculation using ANSYS. This Thesis shows how elements BEAM188 and COMBI214 are used to model the shaft and bearings, respectively.The purpose of a standard rotor dynamics analysis of Steam turbine rotor is to enable an engineer to characterize the lateral dynamics design characteristics of a given design. With the Campbell plots, we can determine critical speeds and system stability. These techniques, along with a same modeling and results are also calculated from TMS-050 to verify ANSYS result with testing result for unbalance response.

Index Terms—Ansys, Critical speed, Rotor, Rotor dynamics, Steam turbine, TMS-050, Vibrations

Cite: Nagaraju Tenali and Srinivas Kadivendi, "Rotor Dynamic Analysis of Steam Turbine Rotor Using Ansys," International Journal of Mechanical Engineering and Robotics Research, Vol. 3, No. 1, pp. 338-349, January 2014.