Nonlinear Dynamic Analysis of a Flexible Rotor System with a Combination of Fixed-Tilting Pads Journal Bearing Supports

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (5) : 257-262.

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Nonlinear Dynamic Analysis of a Flexible Rotor System with a Combination of Fixed-Tilting Pads Journal Bearing Supports

LU Yan-Jun1, YU Yang-Bing1, ZHANG Yong-Fang2, WANG Dong1, YU Lie3

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Abstract

Abstract： Based on the Reynolds equation with Reynolds boundary conditions, the Castelli method was employed to solve the Reynolds equation for oil lubrication upon bearings. By doing so, a profile of nonlinear oil film force of single pad journal bearings is established. According to the structure of combination journal bearings, nonlinear oil film force of combination journal bearing is obtained by retrieval, interpolation, and assembly techniques. As for symmetrical flexible Jeffcott rotor system supported by combination journal bearings, the nonlinear motions of the center of the rotor are calculated by self-adaptive Runge-Kutta method and Poincaré mapping during different rotational speed tests under different pivot ratio. Numerical results show that the performance of system becomes slightly better when the pivot ratio changes from 0.5 to 0.6, and reveal periodic, period-doubling, quasi-periodic motion, etc. nonlinear behaviors.

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Fixed-Tilting Pad Combination Journal Bearings / Nonlinear / Dynamics / Bifurcation

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LU Yan-Jun;YU Yang-Bing;ZHANG Yong-Fang;WANG Dong;YU Lie. Nonlinear Dynamic Analysis of a Flexible Rotor System with a Combination of Fixed-Tilting Pads Journal Bearing Supports[J]. Journal of Vibration and Shock, 2011, 30(5): 257-262