Stability analysis of a rotor bearing system due to surface waviness and number of balls

In the paper, the stability analysis of a rigid rotor supported by ball bearings has been studied. In the analytical formulation, the contacts between balls and races are considered as nonlinear springs, whose stiffnesses are obtained by using Hertzian elastic contact deformation theory. The implici...

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Bibliographic Details
Published in:International journal of mechanical sciences 2004-07, Vol.46 (7), p.1057-1081
Main Authors: Harsha, S.P., Kankar, P.K.
Format: Article
Language:English
Subjects:
FFT
Newmark-β
Nonlinear vibrations
Poincarè map
Surface waviness
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Summary:In the paper, the stability analysis of a rigid rotor supported by ball bearings has been studied. In the analytical formulation, the contacts between balls and races are considered as nonlinear springs, whose stiffnesses are obtained by using Hertzian elastic contact deformation theory. The implicit type numerical integration technique Newmark-β with Newton–Raphson method is used to solve the nonlinear differential equations iteratively. The effects of surface waviness and the varying number of balls on stability of rotor bearing system are observed. All results presented in form of fast fourier transformations show that the vibration characteristics of the rotor and its bearings change, when the bearings operate in different regions of their nonlinear load deflection characteristics. From the analysis, it is implied that the number of balls and number of waves in the ball bearing are two important governing parameters affecting its dynamic behavior.
ISSN:0020-7403
1879-2162
DOI:10.1016/j.ijmecsci.2004.07.007