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Non-contact resistance and capacitance on-line measurement of lubrication oil film in rolling element bearing employing an electric field coupling method.pdf
Measurement 91 (2016) 606–612
Contents lists available at ScienceDirect
Measurement
journal homepage: /locate/measurement
Non-contact resistance and capacitance on-line measurement of lubrication oil ?lm in rolling element bearing employing an electric ?eld coupling method
Kai Xie (谢楷) a,?, Long-Chao Liu (刘龙超) a, Xiao-Ping Li (李小平) a, Han-Lu Zhang (张涵璐) b
a School of Aerospace Science and Technology, Xidian University, Xi’an 710071, China b School of Communication and Information Engineering, Xi’an University of Posts and Telecommunications, Xi’an 710121, China
article info
Article history: Received 16 June 2015 Received in revised form 24 May 2016 Accepted 24 May 2016 Available online 30 May 2016
Keywords: Bearing Oil-?lm Non-contact measurement
abstract
The lubrication condition of a radially loaded rolling element bearing mainly depends on the continuity of the oil ?lm between friction pairs, which is critical for highly reliable electromechanical systems. To achieve the continuous online monitoring of the lubricating condition of the bearing oil ?lm, a noncontact measuring method for both the oil ?lm capacitance and resistance, which can be used to detect oil deterioration and ?lm damage, is proposed. The method is implemented by measuring the complex impedance of the oil ?lm using two electric ?eld coupling paths instead of slip rings, thus avoiding mechanical contact with the rotating parts directly. This paper provides the equivalent circuit of the lubrication structure in the bearing and the operational principle, algorithm, and circuit implementation of the non-contact measurement. Veri?cation experiments were carried out for a practical rotary mechanical system, obtaining the capacitance in the range of 50–300 pF and the resistance in the range of 50 kX–2 MX with error less than 15%, which is suf?cient for practical on-line lubrication monitoring. The proposed method has a wide range of applications in high-reliability, high-speed, and precise suspension s
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