Designing high-performance industrial machinery with fluid-film bearings for safe and stable operation relies on accurate stability prediction. One element of accurate stability prediction is fluid-film bearing properties. Bearing codes are utilized to predict fluid-film bearing properties and these prediction models are validated using various test rigs. Due to systematic errors present in test rigs, estimated bearing coefficients have associated uncertainty. Uncertainty in fluid-film bearing coefficient estimation due to displacement measurement error, force measurement error, and rotor flexibility is analyzed. A single-degree-of-freedom system model is analyzed to understand trends in uncertainties. Computer modeling software is used to develop a modular, high-fidelity model to analyze a test rig for worst-case uncertainty in fluid-film bearing coefficient estimation for a tilting-pad journal bearing. The results show that for high excitation frequencies the uncertainty is large enough that estimated coefficients are practically useless.

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