Dynamic Balancing of a Centrifuge: Application to a Dual-Rotor System with Very Little Speed Difference

Abstract

The conventional way of separating the vibration signals of the inner and outer rotors of a dual-rotor system is to separate the composite "beat" signal; however, this is not effective for a dual-rotor system with little speed difference. We propose a new method of separating the vibration signals of the inner and outer rotors of a system with veiy little speed difference. It is not necessary to separate the composite " beat" signal, as in the conventional method. The magnitude and phase values of the unbalanced weights are obtrined directly by sampling the vibration signal synchronized with a reference signal. The balancing process is completed by the reciprocity influence coefficients of the method of the inner and outer rotors. The results show the advantage of such a method for a dual-rotor system, compared with conventional balancing. The proposed new method has been successfully implemented in field dynamic balancing of the centrifuge with such dual-rotor systems in two rectifying planes with digital signal processing and virtual instrument technology.