Abstract
The Jeffcott Rotor used widely in the analysis of resonancies is a two-degree-of-freedom model with a disk at the midspan of a massless-shaft. Natural frequency of a forward whirling mode pf and that of a backward whirling mode pb have the relation of ps:pb=1:-1. Consequently, subharmonic resonancies of a forward and a backward whirling modes and a combination resonance occur at the same rotational speed of twice the major critical speed and internal resonance phenomena appear. In this paper, nonlinear phenomena in the neighborhood of this rotational speed are investigated. The following are clarified theoretically and experimentally. (a) The shape of resonance curves becomes far more complex than that of a single resonance. (b) A quasi-periodic motion occurs. (c) These phenomena are influenced greatly by the misalignment in assembly and misattachment of rotor position.
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