Balancing of Dynamic Rotors with Distributed Unbalance

Abstract

The unbalance present in the rotor gives rise to a synchronous unbalance force in the rotor. To minimize or eliminate the effects caused due to this unbalance force, the rotor needs to be balanced. The unbalance of the rotor needs to be estimated and determined well before balancing, for better results. The unbalance is assumed to be distributed over the entire span of the rotor. The unbalance eccentricity curve is assumed to be a polynomial. The geometry of the bent rotor i.e. the eccentricity present in the rotor, determines the amount of unbalance in the rotor. The relation between the inherent eccentricity and the unbalance force response is established and the unbalance distribution is determined from the relation.