Dong-Ju Han
International Journal of Aeronautical and Space Sicences, vol. 5, no. 2, pp.35-42, 2004

Abstract : Among other critical conditions in rotor systems the large non-linear vibration excited by bearing non-linearity causes the rotor failure. For reducing this catastrophic failure and predictive analysis of this phenomena the identification analysis of bearing non-linearity in an anisotropic rotor system using the higher order dFRFs are developed and are shown to be theoretically feasible as in non-rotating structures. For the identification of the anisotropic rotor with anisotropic bearing non-linearity expressed by the displacement in polynomial form, the higher order dFRFs based upon the Volterra series are investigated and depict their features by using the simple forms of the normal and reverse dFRFs. They produce additional sub-harmonic resonant peaks, which indicate the existence of higher order non-linearties, and show the energy transfer such that the modes for normal and reverse dFRFs are exchanged, which are the fundamental differences from what we can expect in linear ones.

Keyword : No keyword