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The 2nd method exploited the use of the kinematic sim-ulation program and the carefully monitored geometry of the planetary system during testing. The geometrically syn-chronized measurement method matches the signal’s re-sponse with the sun gear teeth in mesh and tallies a condi-tion indicator parameter. For this study, the sum of the sixth power of the amplitude was used. Consistent with SGVS -SASP , the best responses are obtained for the low-power cases. This is due to the increased vibration often associ-ated with lower powers. Plots showed that for the baseline case, there was no biasing of the values of each bin. For the sun gear with a single tooth spall, there was an emer-gence of mesh groups indicating increased damage, but the result, based on the condition indicator used, was inconclu-sive. The results for the multiple spall case clearly shows that the damage is on the sun gear. References 1Stewart, R., “Some Useful Analysis Techniques for Gearbox Diagnostics,” Report MHM/R/10/77 -Machine Health Monitoring Group-Institute of Sound and Vibration Research, University of Southampton, July 1997. 3Zakrajsek, J., Townsend, D., and Decker, H., “An Anal-ysis of Gear Fault Detection Methods as Applied to Pitting Fatigue Failure Data,” NASA TM-105950, Vol. AVSCOM TR-92-C-035, 1993. |
