Effect of Bearing Dynamic Properties on the Lateral Vibration of a Flexible Rotor

Helen Wu

doi:10.4028/www.scientific.net/AMM.553.693

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Modelling of Guided Wave Propagation with Spectral Element: Application in Structural Engineering
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Effect of Bearing Dynamic Properties on the Lateral Vibration of a Flexible Rotor
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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 553Effect of Bearing Dynamic Properties on the...

Effect of Bearing Dynamic Properties on the Lateral Vibration of a Flexible Rotor

Abstract:

Analytic study of rotor vibration plays an important role in design, and fault detection and diagnosis of rotating machines. In this paper, vibration characteristics of a flexible rotor due to a central mass unbalance were analysed numerically under two cases. In Case I, bearings have symmetric, isotropic stiffness and damping matrices, while in Case II they have asymmetric, non-isotropic stiffness and damping matrices. It was found in Case I that critical speed occurs at 1690 rpm and the orbital trajectories of rotor mass stations are circular and corotational. In Case II, response orbit of either the bearing or the disk is elliptic and the size, shape, and orientation of the elliptical orbit changes with shaft speed, and also from the bearing to the disk.

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Periodical:

Applied Mechanics and Materials (Volume 553)

Pages:

693-698

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.553.693

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Online since:

May 2014

Authors:

Helen Wu*

Keywords:

Asymmetrical Bearing Stiffness Matrix, Mass Unbalanced Rotor, Response Orbit, Rotor Dynamics

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