Friction measurements on small journal bearings

Abstract eng:
The setup described in this work allows precise friction measurements on small bearings for various shaft-speeds, radial loadings, lubricants and gap widths. The system is able to capture simultaneously the friction, as well as the relative displacement between shaft and bearing which reveals the displacement trajectory and the dynamic behavior, mainly half-frequency whirling with critical speeds. If displacement is considered for the friction measurement, an improvement in measurement accuracy is achieved when compared to previously reported techniques. Geometrical tolerances are identified by two measurements and corrected.

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