Ultrasonic measurement of oil film thickness in cylindrical roller bearings under mixed lubrication

LI Meng1,2,3,TIAN Guibin2, LIU Yi2, LIU Heng2, QI Shemiao2, SONG Haitao3,4, JI Chuanyi5

Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (10) : 279-284.

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (10) : 279-284.

Ultrasonic measurement of oil film thickness in cylindrical roller bearings under mixed lubrication

  • LI Meng1,2,3,TIAN Guibin2, LIU Yi2, LIU Heng2, QI Shemiao2, SONG Haitao3,4, JI Chuanyi5
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Abstract

Cylindrical roller bearings are widely used in various types of large equipment under low speed and heavy load conditions due to their linear contact characteristics.Their operating performance and stability are closely related to the contact lubrication state between rollers and the inner or outer rings.The ultrasonic method based on equivalent stiffness can be used to measure the thickness of elastohydrodynamic lubrication film of roller bearings under actual working conditions.But it cannot be directly applied to the measurement of oil film thickness in mixed lubrication state under low speed and heavy load conditions.Therefore, an ultrasonic measurement method under mixed lubrication was proposed in this paper, and the parallel model of interface oil film stiffness and rough body contact stiffness was established.By introducing the contact coefficient and combining with the empirical formula, the total interface stiffness measured by ultrasonic method was decomposed to get the oil film stiffness under mixed lubrication state.Then a more accurate oil film thickness was obtained.Finally, through comparing the experimental and theoretical results, the feasibility and validity of the proposed model were verified.

Key words

cylindrical roller bearing / mixed lubrication / ultrasonic measurement / contact coefficient / oil film thickness

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LI Meng1,2,3,TIAN Guibin2, LIU Yi2, LIU Heng2, QI Shemiao2, SONG Haitao3,4, JI Chuanyi5. Ultrasonic measurement of oil film thickness in cylindrical roller bearings under mixed lubrication[J]. Journal of Vibration and Shock, 2020, 39(10): 279-284

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