As an important part of the rotor system, the damping coefficient of ball bearing has a great influence on the dynamic characteristics of the system. This study aims to propose a theoretical calculation method and an experimental test method to obtain the damping coefficient of ball bearing.,Based on Hertzian contact theory and elastohydrodynamic lubrication theory, the point contact oil film damping analysis model of ball bearing is established. The comprehensive damping calculation method considering external radial load, centrifugal force, ball spin, rotational speed and lubricating oil film is derived. The multigrid method is used to obtain the oil film pressure and thickness distribution in the contact zone. The variation trend of comprehensive damping with bearing radial load, rotational speed, oil film thickness and viscosity is analyzed. The test platform is designed and the influencing factors of damping are tested.,The validity of the model and reliability of the test device are verified by comparing the good consistency obtained in the work. The results show that the comprehensive damping of ball bearing increases with the increase of radial load and decreases with the increase of rotational speed.,At present, the existing bearing damping model can achieve approximate calculation of damping, but the factors considered in these models are not comprehensive enough. Besides, few studies exist regarding test platform of bearing damping, and a perfect test plan has not yet been formed. In this paper, the comprehensive damping calculation model of ball bearing is improved, and a complete experimental scheme is proposed to provide reference for the comprehensive damping theory and experimental research of bearing.,The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-08-2019-0342/

中文翻译：

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基于多重网格法的球轴承综合阻尼计算方法

球轴承作为转子系统的重要组成部分，其阻尼系数对系统的动态特性影响很大。本研究旨在提出一种获得球轴承阻尼系数的理论计算方法和实验测试方法。,基于赫兹接触理论和弹性流体动力润滑理论,建立了球轴承点接触油膜阻尼分析模型。推导出考虑外部径向载荷、离心力、滚珠自旋、转速和润滑油膜的综合阻尼计算方法。采用多重网格法获得接触区的油膜压力和厚度分布。分析了综合阻尼随轴承径向载荷、转速、油膜厚度和粘度的变化趋势。设计了测试平台,对阻尼的影响因素进行了测试,通过对比工作中获得的良好一致性,验证了模型的有效性和测试装置的可靠性。结果表明,球轴承的综合阻尼随着径向载荷的增加而增大,随着转速的增加而减小。,目前现有的轴承阻尼模型可以实现阻尼的近似计算,但这些模型中考虑的因素有不够全面。此外，关于轴承阻尼试验平台的研究较少，尚未形成完善的试验方案。本文对球轴承综合阻尼计算模型进行了改进，