Modal Analysis of Asymmetric Rotor System Using Simple Model

This paper includes modal analysis of an asymmetric rotor system. The analysis has been carried out in the rotating co-ordinate system so that the equations of motion do not include time dependent terms in it. After analysis, the eigenvalues are transformed back into stationary co-ordinate system. The real and imaginary parts of the eigenvalues thus obtained are plotted. Such analysis is very important as rotor systems with asymmetric nature gets unstable between some speed ranges. Stability graphs are plotted and analyzed to find out the regions of instability for the rotor system using a simple rotor model.