Adaptive Disturbance Rejection and Stabilization for Rotor Systems With Internal Damping

Abstract

Advanced rotor systems today consist of a lightweight rotor supported by radial active magnetic bearings. It has been shown in previous works that composite materials have high energy dissipation characteristics, mainly due to internal damping. In applications where the rotor speed is subcritical, this property is of low concern, whereas at supercritical speeds the effect of internal damping should not be ignored due to instability effects described in detail later. Therefore, it is essential that one must have a detailed understanding of the sources and effects of internal damping in these structures. This work addresses the application of Adaptive Disturbance Rejection control method to deal with the rotordynamic instability caused by internal damping and synchronous vibrations caused by mass imbalance in a rotor system operating at supercritical speed. The simulated system is a slim, flexible shaft represented by a 73-node finite element model. A detailed description of the problems and the strategies for addressing them are discussed.

Numerical Simulation of a Small Size Rotor With Selfinduced Instability Using Sliding Mode and Fopid Controller and Their Comparison

“…"Modeling and Simulation of Process Machine Interaction in Grinding systems" [23] this paper gave an overall insight that how dry friction forces in between the rotor tool and the mating surface created a tool hunting and wandering effect within the rotor system however no real control strategy to overcome such instability was discussed. PhD thesis [24] was referred to understand the effects of rotor imbalance and external disturbances in the rotor system and some adaptive control strategies were also studied.…”

A simple linear quadratic regulator (LQR) approach for active stabilization of mini rotors due to spinning dissipation

“…"Modeling and Simulation of Process Machine Interaction in Grinding systems" [23] this paper gave an overall insight that how dry friction forces between the rotor tool and the mating surface created a tool hunting and wandering effect within the rotor system however no real control strategy to overcome such instability was discussed. PhD thesis [24] was referred to understand the effects of rotor imbalances and external disturbances in the rotor system. One might choose the overall rotor parameters like the internal damping in the rotating frame, as = 2 such that its effective value in all directions is 'Ri'.…”

An Active Vibration Control Strategy to Prevent Nonlinearly Coupled Rotor–Stator Whirl Responses in Multimode Rotor-Dynamic Systems

“…The use of actuated clearance bearings has been proposed for alleviating rub interaction [11], and for recovering stable levitation in magnetic bearing systems [12]. In other work, destabilizing nonlinear effects are accounted for in controller designs through linear approximations [13]- [16].…”