This paper presents an adaptive output-feedback control method based on neural networks for a flexible link manipulator that is a nonlinear non-minimum phase system. The proposed controller compris...

Nonlinear output feedback control of a flexible link using adaptive neural network: controller design

The internal friction associated with the shaft hysteresis or with the possible release of some shrink-fit coupling exerts a destabilizing effect on the over-critical rotor running, but may be effi...

Approach to rotor-shaft hysteretic whirl using Krylov–Bogoliubov techniques:

The article presents the results of the analysis of the active control of Stodola-Green rotor, made of a cantilevered beam with a rigid disc attached to its free end. The rotor is of a smart type, ...

The influence of the active control of internal damping on the stability of a cantilever rotor with a disc

In this paper the authors have extended their work on active stabilization of rotors with circulatory force arising from linear viscous dissipation in a frame rotating with the rotor to an active stabilization of the rotor with face grinding or abrasive tool tip for surface processing of brittle materials like inorganic glasses or thin strata or wafers of semiconducting materials for production of optoelectronic or integrated circuit devices. The dynamics and stabilization of such systems turned out much more complex than one that was addressed earlier due to the complex nature of dry friction forces. To analyze the dynamical nature of dry friction forces in rotating frames four vector operators are proposed. The operators provide a rational basis for creation of paradigms and algorithms (gain switching scheme) for stabilization. The efficacy of the proposals is established by simulation studies.

A proposal for active control of face abrasive tool wandering

An appropriate reference signal is proposed to compensate the unmatched uncertainties inherent in the internal system dynamics. The adaptation laws for the neural network weights and adaptive gains...

Nonlinear output feedback control of a flexible link using adaptive neural network: stability analysis

Destabilizing effects due to rotating dampers in gyrating or spinning systems govern their dynamic behavior very prominently. Tippe-tops and gyro-pendulums exhibit their seemingly counter intuitive behavior due to such dissipations. Rotors at speeds higher than certain threshold values become unstable due to rotating damping forces generated by dissipation in rotor material, couplings or due to friction in splines and tool tips. There are several techniques by which one may stabilize such rotors. Although the current methods in practice are quite effective for large or medium size rotors but these may not be suitable for small, mini or micro rotor systems. This paper proposes a class of alternative techniques to stabilize rotors any size through implementation of strategies developed here, however the selection of actuating mechanism would depend on the size of the rotor. In this paper the size of the rotor that may be actuated by piezo-electrical type actuators are considered. Thus may be called small si...

A. Mukherjee

Papers

Active stabilization of rotors with circulating forces due to spinning dissipation

A proposal for active control of face abrasive tool wandering