Volume 9 Issue 2 - November 2017

  • 1. Evolution of whirl in flexible isotropic rotors : modelling and experimental study

    Authors : Chandan Chattoraj

    Pages : 149-157

    DOI : http://dx.doi.org/10.21172/1.92.26

    Keywords : Asymmetric Rotor Bearing Systems; Gyroscopic Couple; Rotatory Inertia; Coriolis Force; Supercritical response ; Instability.

    Abstract :

    Rotors are principal elements of a wide variety of machineries. Early investigators had noticed the effects of imbalance and increasing speeds on the vibrations as the rotors operated near resonance. The modern high speed trend to enhance the power-to-weight ratios has rendered the study of rotor dynamics as one of upmost importance as vibration failures may prove disastrous. Etiology of rotor’s dynamic behaviour may often be counter-intuitive, especially when flexible systems with rotational asymmetry are required to operate above the primary critical speed. The intent of the present work is to investigate the evolution of the vibratory motion in a horizontal rotor with orthotropic flexible end constraint (bearing), both in the sub critical and super critical states. The analysis includes the effects of rotatory inertia, gyroscopic couple, Coriolis force and internal/external damping producing a four degree of freedom system and the method was experimentally validated on a test facility.

    Citing this Journal Article :

    Chandan Chattoraj, "Evolution of whirl in flexible isotropic rotors : modelling and experimental study", Volume 9 Issue 2 - November 2017, 149-157