There are a variety of abnormal running conditions in rotating machinery that lead to rotor/stator interaction dynamics which, in turn, have a range of effects associated with them. One of these effects is steady vibration response at frequencies which are different from the excitation. This paper describes a mechanism of generating subharmonic vibration frequencies in both numerical simulation and measurements, which are obtained from a study of the relatively new problem of “windmilling imbalance” in aero-engines. What is different from other nonlinear systems with, say, clearance or squeeze film dampers, is the richness of the frequency spectrum.

Issue Section:
Technical Papers
Keywords:
stators, rotors, vibrations, numerical analysis, nonlinear dynamical systems
Topics:
Rotors, Stators, Vibration, Simulation
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Copyright © 2002
 by ASME
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