윤활면의 실시간 시각화를 위한 도립형 트라이보미터 개발 = Development of Inverted Tribometer for Visualization of Lubricated Interfaces

다국어 초록 (Multilingual Abstract)

The observation of lubrication interface is crucial for analyses of tribological behavior. However, it is chal lenging owing to various physical and structural constraints. Conventional pin-on-disk tribometers often suffer from limited visibility of the contact zone and oil leakage at high speeds. To overcome these challenges, this study intro duces a novel inverted tribometer designed for simultaneous friction measurement and real-time contact interface monitoring. The design features an upward-facing drive shaft that rotates a transparent glass disk within a stationary oil reservoir. By positioning the counter material beneath the glass disk, the design achieves a clear view of the lubri cation interface. To validate the structural reliability and operational stability of the design, numerical simulations are conducted using the COMSOL software. These analyses confirm the system's structural integrity under a normal load of 29.4 N and demonstrate stable fluid behavior at speeds up to 500 rpm. Subsequent experimental results verify that the system effectively facilitates a quantitative analysis across varying speeds and loads. The device successfully dis tinguishes lubrication regimes by capturing the transition to a hydrodynamic behavior and facilitates a clear, real-time observation of outlet cavitation expansion as the rotational speeds increases. This device offers a robust platform to study the tribological characteristics of various lubricants and complex tribological mechanisms.