Experimental Measurements of Oil Films in a Dynamically Loaded Journal Bearing

This article describes the design of a journal bearing test platform capable high-accuracy film thickness measurements via ultrasonic transducers permanently embedded in both and rotating shaft. A bespoke hydraulic loading system with programmable valves allowed application dynamic loads defined patterns, including simulation patterns found real components such as automotive connecting rod bearings. Tests under range rotation speeds, temperatures, profiles detailed analysis response to rapidly changing loads. Unlike conventional methods, technique offers noninvasive direct measurement shaft–bearing interface, thus enabling study phenomena squeeze effects. Measurements were achieved by applying novel referencing method, referred “snapshot technique”. Via this time was shown reduce increasing shaft speed, applied load, temperature. Results compared against inductive sensors numerical techniques good agreement observed.