Vibration analysis of a dual-rotor-bearing-double casing system with pedestal looseness and multi-stage turbine blade-casing rub

Research and applications of active bearings: A state-of-the-art review

Model based analysis and identification of multiple fault parameters in coupled rotor systems with offset discs in the presence of angular misalignment and integrated with an active magnetic bearing

Finite element modelling, analysis and identification using novel trial misalignment approach in an unbalanced and misaligned flexible rotor system levitated by active magnetic bearings

Dynamic analysis and identification of unbalance and misalignment in a rigid rotor with two offset discs levitated by active magnetic bearings: a novel trial misalignment approach

Application of active magnetic bearings in flexible rotordynamic systems - A state-of-the-art review

In the present work, a rotor train system is connected by a flexible coupling and integrated with an auxiliary active magnetic bearing. Due to angular misalignment that exists between the shafts, coupling stiffness varies with shaft rotation. A mathematical function that is time-dependent and which can yield integer harmonics has been chosen to numerically model coupling additive stiffness. The equations of motion have been obtained from Lagrange’s equation. The amplitude and phase of peaks of rotor vibration and AMB current signatures have been obtained in time and frequency domains using least-squares regression technique and full spectrum technique, respectively. They are eventually utilized to identify the intact and additive stiffness of coupling, viscous damping, unbalance magnitude and phase, and the AMB displacement and current stiffness. A SIMULINKTM has been built to generate time domain responses of discs and AMB current. From the EOM of rotors regression equations have been formed in frequency domain to create an inverse problem. The identification algorithm has been found to be robust against noise levels up to 5%.

Identification of Coupling Parameters in Flexibly Coupled Jeffcott Rotor Systems with Angular Misalignment and Integrated Through Active Magnetic Bearing

Ch. Kannababu

Papers

Application of active magnetic bearings in flexible rotordynamic systems - A state-of-the-art review

Model based analysis and identification of multiple fault parameters in coupled rotor systems with offset discs in the presence of angular misalignment and integrated with an active magnetic bearing

Identification of Coupling Parameters in Flexibly Coupled Jeffcott Rotor Systems with Angular Misalignment and Integrated Through Active Magnetic Bearing