The hydrodynamic characteristics of liquid film for bearings, especially water-lubricated bearings with a large length-to-diameter ratio, affect the dynamics behavior of rotor bearing systems. The purpose of this study is to carry out theoretical analysis and experiments to determine the hydrodynamic characteristics of water-lubricated journal bearings.,The finite difference method is adopted for the simulation of the characteristics of water-lubricated bearings. The comparison results between water-lubricated bearings with and without grooves, as well as with and without the consideration of the effects of rubber deformation, are presented. The test bearings, test bench, and monitoring system, especially the force exciter for the bearing experiment, are presented. Dynamic coefficient identification verification experiments were performed in different working situations. The obtained results include the calibration of magnetic force, two kinds of excitation, vibration data of the rotor system and dynamic coefficients.,The theoretical results demonstrate that the hydrodynamic effect was obvious when the speed was increased and that the water film had improved capability at a working speed of 1800 rpm. The identification results reveal the lubrication situation of the test bearing under low-speed and high-load conditions. Moreover, it was found that the liquid film was not continuous at low speeds.,The theoretical results can lead to the enhancement of the design level of water-lubricated rubber journal bearings with a large aspect ratio. The experimental results can lead to the improvement of the dynamic behavior design of rotor systems supported using water-lubricated bearings with a large length-to-diameter ratio.

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大纵横比水润滑橡胶轴颈轴承的理论与试验分析

轴承液膜的流体动力学特性，尤其是大长径比的水润滑轴承，会影响转子轴承系统的动力学行为。本研究的目的是通过理论分析和实验来确定水润滑径向轴承的流体动力学特性。采用有限差分法对水润滑轴承的特性进行模拟。给出了带槽和不带槽的水润滑轴承以及考虑和不考虑橡胶变形影响的比较结果。介绍了试验轴承、试验台和监测系统，特别是用于轴承试验的力激振器。在不同工况下进行动态系数辨识验证实验。获得的结果包括磁力标定、两种激励、转子系统振动数据和动力系数。理论结果表明，当转速增加时，水动力效应明显，水膜在1800转/分的工作速度。鉴定结果揭示了试验轴承在低速高负荷条件下的润滑情况。此外,发现低速时液膜不连续。,该理论结果可以提高大纵横比水润滑橡胶轴颈轴承的设计水平。