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Research on Thickness Measurement of Lubricating Oil Film Based on Contact Resistance Method |
TONG Wei-jie1,2,HUANG Lu2,JIA Xin2,SUN Miao2,CAI Jin-hui1 |
1. Collage of Metrology & Testing Engineering,China Jiliang University,Hangzhou,Zhejiang 310018,China
2. National Institute of Metrology,Beijing 100029,China |
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Abstract A method for measuring lubricating oil film thickness based on contact resistance method has been proposed, and a rotating friction testing machine that can measure contact resistance in real-time to evaluate lubricating film thickness has been developed. The correlation between oil film thickness and contact resistance in boundary lubrication and mixed lubrication states is studied and established. Load and speed are precisely controlled to realize a stable lubrication condition. The electrical resistance of the contact area is measured in-situ by a specially and precisely designed electrical circuit. Corresponding relation between the contact resistance and lubrication film thickness measured by the optical interference method under the same working conditions has been established,the correlation coefficient of the fitting curve is 0.98, and the remaining standard deviation is 4.56nm. This study provides technical experience and data support for the characterization of lubrication state in real operating conditions.
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Received: 27 February 2023
Published: 27 December 2023
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