Effect of rotor-stator contact on the mass unbalance response

Abstract

In turbo-engines the sudden increase of mass unbalance, due for example to a blade-loss, can generate rotor-stator contacts in different zones of the motor architecture: turbine blade/flange, centrifugal compressor wheel/shroud, seals, stopend bearing. The aim of this paper is to analyse the influence of such rotor-stator interactions on the dynamic behaviour of two types of academic rotors. Several contact laws combined with smoothing methods are investigated in order to implement them in rotor dynamics models. The full annular rub and a finite impact series in forward whirl are exhibited.