Abstract
Preloaded three-lobe and pressure dam bearings were tested with a three-mass flexible rotor. The oil viscosity was varied. The resulting changes in the instability threshold were measured and were found to depend markedly on oil viscosity. Data were compared with theoretical stability map predictions. The data were typically 50% higher than predicted for the three-lobe bearing and were within ±30% for the pressure dam bearing. Although the predictions are not quantitatively correct, the correct trends are predicted, i.e. the experimental and theoretical stability maps show the same trends for instability thresholds as functions of the Sommerfeld number.
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