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Nonlinear Vibration Induced by the Water-film Whirl and Whip in a Sliding Bearing Rotor System

Chinese Journal of Mechanical Engineering 2016年第2期29卷 260-270页

作者： ZHAI Liming LUO Yongyao WANG Zhengwei kitauchi seishiro MIYAGAWA Kazuyoshi State Key Laboratory of Hydroscience and Engineering Tsinghua University Department of Thermal Engineering Tsinghua University Department of Applied Mechanics and Aerospace Engineering Waseda University

Many industrial applications and experiments have shown that sliding bearings often experience fluid film whip due to nonlinear fluid film forces which can cause rotor-stator rub-impact failures. The oil-film whips have attracted many studies while the water-film whips in the water lubricated sliding bearing have been little researched with the mechanism still an open problem. The dynamic fluid film forces in a water sliding bearing are investigated numerically with rotational, whirling and squeezing motions of the journal using a nonlinear model to identify the relationships between the three motions. Rotor speed-up and slow-down experiments are then conducted with the rotor system supported by a water lubricated sliding bearing to induce the water-film whirl/whip and verify the relationship. The experimental results show that the vibrations of the journal alternated between increasing and decreasing rather than continuously increasing as the rotational speed increased to twice the first critical speed, which can be explained well by the nonlinear model. The radial growth rate of the whirl motion greatly affects the whirl frequency of the journal and is responsible for the frequency lock in the water-film whip. Further analysis shows that increasing the lubricating water flow rate changes the water-film whirl/whip characteristics, reduces the first critical speed, advances the time when significant water-film whirling motion occurs, and also increases the vibration amplitude at the bearing center which may lead to the rotor-stator rub-impact. The study gives the insight into the water-film whirl and whip in the water lubricated sliding bearing.

关键词： rotor system sliding bearing vibration water-film whip nonlinear

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