Chaotic Vibrations of Rotor/Bearing/Stator Systems With Looseness or Rubs

Abstract

Abstract This paper presents results of numerical simulation of the dynamic behavior of a one-lateral-mode unbalanced and radially side-loaded rotor with either loose pedestal (looseness in a stationary joint), or with one oversize bearing (looseness between a rotating and stationary joint), or with occasional rotor/stator rubbing. The nonlinearities of these systems (variable stiffness, impacting, and friction) are associated with intermittent contacts with the stationary element. The results, based on a local impact model, developed in the author’s previous publications, exhibit regular periodic, as well as chaotic vibration patterns of the rotor.