Failure of the oil supply to a gearbox leads to breakdown of the oil-film between teeth after extended running. The progressive stages in the surface contacts, which initially improve the gears and then give failure, can be monitored using the Smith shocks, which are generated at the asperity interactions.
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References
1.
SmithJ. D.A new diagnostic technique for asperity contact. Tribol. Int., 1993, 26(1), 25.
2.
SmithJ. D.A gear test rig with variable torque actuator. Proc. Instn Mech. Engrs, Part C, 1992, 206(C5), 311–315.
