ISSN   1004-0595

CN  62-1224/O4

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双向偏载对含沟槽结构水润滑轴承润滑特性影响机理研究

Research on the Influence of Bidirectional Misalignment on the Lubrication Characteristics of Water-Lubricated Grooved Bearings

  • 摘要: 针对含有沟槽结构的水润滑轴承在偏载工况下运行时润滑状态不明朗的问题,建立了同时考虑双向偏载效应与湍流效应的润滑模型,深入分析了双向偏载对轴承内部流体动力学的影响,以及这些影响如何进一步作用于轴承的润滑特性,揭示了偏载条件下磨损加剧的热点区域,为优化轴承材料选择、表面处理技术及维护策略提供了理论依据. 采用扰动法分析了轴承水膜的刚度特性与阻尼特性. 通过数值模拟的方式,系统地探明了在不同偏载条件下,转速、外载荷、以及沟槽数目对轴承水膜厚度、水膜峰值压力、主刚度、主阻尼等关键静特性与动特性参数的影响. 结果表明,单向偏载与双向偏载均会对轴承内部的流体动力学特性产生不同程度的影响,导致水膜厚度和水膜压力分布的不均匀性增加,进而影响到轴承的润滑效果和运行稳定性. 高转速、小外载荷条件下,不同偏载条件下的润滑效果均有明显提升. 然而,偏载往往能使得轴承水膜得到略高于无偏载时的刚度与阻尼特性. 本研究不仅深化了对双向偏载下水润滑轴承润滑特性的理解,还为工程实践中轴承的设计、制造及维护提供了科学依据和实用指导,对促进相关领域的技术进步具有重要意义.

     

    Abstract: A lubrication model considering both misalignment and turbulence effects is established to address the issue of unclear lubrication status of water-lubricated bearings with groove structures during operation under misaligned conditions. The impact of misalignment effects on the internal fluid dynamics of the bearing is analyzed in depth, and how these effects further affect the lubrication characteristics of bearing. The hot spots where wear intensifies under misaligned conditions are revealed, providing a theoretical basis for optimizing bearing material selection, surface treatment technology, and maintenance strategies. The stiffness and damping characteristics of the water film are analyzed using the perturbation method. Through numerical simulation, the influences of rotational speed, external load, and number of grooves on key static and dynamic parameters such as water film thickness, peak water film pressure, main stiffness, and main damping of bearings under different misaligned conditions were systematically investigated. Results indicate that both unidirectional and bidirectional misalignment have varying degrees of impact on the fluid dynamics characteristics inside bearing, leading to an increase in the unevenness of water film thickness and water film pressure distribution, which in turn affects the lubrication effect and operational stability of the bearing. Under high-speed and low external load conditions, the lubrication effect is significantly improved under different misaligned conditions. However, misalignment often results in slightly higher stiffness and damping characteristics of the bearing water film compared to alignment. This study not only deepens the understanding of the lubrication characteristics of water lubricated bearings under misaligned conditions, but also provides scientific basis and practical guidance for the design, manufacturing, and maintenance of bearings in engineering practice, which is of great significance for promoting technological progress in related fields.

     

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