Abstract
The paper presents a theoretical model of a rotor supported by a rigid shaft, running in two non-linear oil-film bearings. The model is utilised to examine the stability of rigid rotor systems with varying degrees of static journal/bush misalignment. Although static misalignment has a significant effect on the running position and orbit size of a rotor system subject to out of balance or step displacement forces, the stability of the system is only affected when the journal is operating close to the stability boundary. It is shown that when a dynamic conical misalignment is induced, the journal axes being skew to that of the shaft, there is no apparent effect on the running position of the journal but the stability of the system can be significantly improved, even where the system would be normally operating well into the unstable regime.
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