Active disk for automatic balancing of rotor-bearing sytems

Abstract

This paper leads with the active cancellation problem of mechanical vibrations in rotor-bearing systems. The use of an active disk is proposed for actively balancing a rotor by means of locating a balancing mass at a suitable position. Two nonlinear controllers with integral compensation are proposed to put the balancing mass at a specific position. Algebraic identification is used for on-line eccentricity estimation, because of the implementation of this active disk is based on knowledge of the eccentricity. An important property of this algebraic identification is that the eccentricity identification is not asymptotic but algebraic, in contrast to most of the traditional identification methods, which generally suffer of poor speed performance. In addition, a velocity control is designed to take the rotor velocity to a desired operating point over the first critical speed. The controllers are developed in the context of an offline prespecified reference trajectory tracking problem. Some numerical simulations are included to illustrate the dynamic performance of the closed loop system and the active vibration cancellation.

Control de Vibraciones en Maquinaria Rotatoria

“…El Disco Equilibrador Activo (DEA) propuesto (ver Blanco-Ortega et al, 2008) es diseñado de manera que la masa equilibradora m 1 se pueda mover en todas las posiciones angulares y radiales dentro del disco, las cuales están denotadas por α y r 1 , respectivamente (Figuras 11 y 12). Estos movimientos pueden obtenerse mediante el uso de un tornillo o husillo para el movimiento radial y con un sistema de engranes cónicos se puede obtener el movimiento angular.…”

Autobalancing control for a reduced gravity simulator

“…Existing approaches to this problem consider mechanisms that are in constant rotation [9], [10]. A specific, passive, autobalancing method is presented in [11], which is a similar to our problem but different enough to not be applicable.…”

Motion Constraints and Trajectory Planning of a Planar Active Dynamic Balancing Mechanism

“…For instance, a planar parallel mechanism is adopted in order to move counterrotary countermass for a planar robot [17]. An active dynamic mechanism composed of three discs was adopted to simultaneously eliminate shaking forces and moments [18].…”