Stability and Vibrational Analysis of a Flexible Damped Rotor System using Finite Element Method

( Vol-2,Issue-8,August 2016 )

Author(s): Akhil Chandran J, Ashfak A

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Page No: 1324-1331
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Keywords:

Analysis, Bearing, Critical speed, Internal damping, Rotor, Unbalance.

Abstract:

Dynamic stability of a damped flexible Rotor system is studied in this work. Analysis of a damped rotating shaft with multiple discs are carried out by, varying the rotor offset positions in order to investigate the effect on critical speed and frequency of the system. From this analysis, it is observed that by varying the rotor offset positions, the modal mass participation varies and which in turn cause a variation in the critical speed and frequency of the system. This study also extends a detailed evaluation of damped rotor stability. Through this analysis it is observed that the system become unstable beyond its critical speed. The stabilizing effects of anisotropic bearing stiffness and external damping are also demonstrated. The effect of unbalance in the rotating machinery is evaluated in the last section.

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