Monitoring Lubrication and Wear in-situ by triboelectrification Under Vacuum Conditions

Maintaining the condition of the friction pair is an important measure to reduce mechanical failure. This paper
integrates a vacuum elastohydrodynamic oil film measurement device and a current amplifier to simultaneously
observe the optical interference image, friction coefficient and triboelectric signal during the friction process. In a
high vacuum environment, the discharge phenomenon of steel balls corresponds to the time when the friction
pair wears. Changes in the friction state in high vacuum environments have a significant impact on triboelec
tricity. Based on the relationship between the two, a sensor for real-time monitoring of the friction and wear
status of the friction pair is designed, which provides a reliable real-time monitoring method for friction pair
monitoring in vacuum machinery.