A Dynamic Analysis of a Flexible Rotor in Ball Bearingswith Nonlinear Stiffness Characteristics

[摘要] This paper presents an effective analysis approach for a flexible rotor in ball bearings withnonlinear stiffness characteristics to obtain realistic dynamic behavior results. The ball bearingis modeled in five degrees of freedom and the nonlinear stiffness characteristics of thebearing are completely described as functions of combined loads and spin speed. For dynamicbehavior analysis of the nonlinear rotor-bearing system, a transfer-matrix method isiteratively used until the bearing displacements and the shaft displacements at every bearinglocation converge to the same values. The results show that the nonlinear stiffness characteristicsof ball bearings significantly influence system dynamic behaviors and the proposedanalysis approach for the nonlinear rotor-bearing system is effective.

[学科分类] 力学，机械学