Optical analysis of ball-on-ring mode test rig for oil film thickness measurement

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Abstract

There are few experimental results available on film thickness at speeds above 5 m/s and they are almost all based on the optical ball-on-disc test rig. In contrast to the contacts in a rolling bearing, in which the lubricant in the oil reservoir distributes symmetrically, ball-on-disc contact shows asymmetry of lubricant distribution due to centrifugal effects. In order to closely imitate the contact occurring between the ball and the outer ring of a ball bearing, this study proposes an experimental model based on ball-on-glass ring contact. An optical matrix method is used to analyze the optical system, which is composed of a steel ball-lubricant-chromium-coated glass ring. Based on the optical analysis, the measurement system is improved in order to obtain a high quality interference image, which makes it possible to measure the film thickness at high-speeds conditions.

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Zhang, Y., Wang, W., Zhang, S., & Zhao, Z. (2016). Optical analysis of ball-on-ring mode test rig for oil film thickness measurement. Friction, 4(4), 324–334. https://doi.org/10.1007/s40544-016-0127-5

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