Analysis of Self-Excited Vibration Generated in Asymmetric Rotating Shaft with Anisotropic Support

Abstract

Rotating machines are widely used in industry and therefore improvement of their efficiency through weight reduction and high-speed operation is always one of the most important tasks. However, such attempts run the risk of generating self-excited vibrations, since it is difficult to accurately predict the vibration characteristics of the high-precision large scale model which closely reflects the effects of shaft asymmetry and anisotropic bearing properties. In order to overcome this problem, this paper proposes a novel technique to construct a reduced model that accurately predicts the stability characteristics of the original large scale model. The effectiveness of the proposed technique is verified by comparing the results of stability analysis between the reduced and full models.