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论文类型：期刊论文

发表时间：2020-04-01

发表刊物：TRIBOLOGY INTERNATIONAL

收录刊物：EI、SCIE

卷号：144

ISSN号：0301-679X

关键字：Cylindrical roller bearing; Time-varying stiffness; Frictional heat generation; Lubricant oil temperature

摘要：In this paper, the time-varying stiffness of the cylindrical roller bearing due to the thermal behavior, i.e. warm-up process and different lubricant oil temperatures are experimentally investigated. Firstly, a special test rig that can measure the bearing stiffness is built. Then, a bearing stiffness identification method is proposed, which can avoid the influence of the clearance and deformation on measurement results. Finally, a series of measurements are carried out at different operational conditions. Results reveal that the bearing stiffness shows strong nonlinearity and time-varying characteristics due to the variation of structure and oil performance. In startup (quasi-isothermal condition) and thermal balance states (combined with the frictional heat generation), the influence of the rotational speed on stiffness is opposite.