Gear Diagnostic Parameters (Vibration Based)

Parameter	Reference
RMS	Root Mean Square of the signal
Kurtosis	4th Statistical Moment of the signal normalized by the square of the variance of the signal.
Delta RMS	Change in the Root Mean Square of the signal
Crest Factor	Swansson, N.S. Application of Vibration Signal Analysis Techniques to Signal Monitoring. Conference on Friction and Wear in Engineering 1980. Institution of Engineers, Australia, Barton, Australia, 1980, pp 262-267.
Sideband Level Factor	Favaloro, S.C. A Preliminary Evaluation of Some Gear Diagnostics Using Vibration Analysis. ARL-AERO-RPOP-TM-427, Aeronautical Research Laboratory, Department of Defence, Melbourne, Australia, 1985.
Energy Ratio	Swansson, N.S. Application of Vibration Signal Analysis Techniques to Signal Monitoring. Conference on Friction and Wear in Engineering 1980. Institution of Engineers, Australia, Barton, Australia, 1980, pp 262-267.
FM0	Stewart, R.M. Some Useful Data Analysis Techniques for Gearbox Diagnostics. Machine Health Monitoring Group, Institute of Sound and Vibration Research, University of Southampton, Report MHM/R/10/77, July 1977.
FM2	Stewart, R.M. Some Useful Data Analysis Techniques for Gearbox Diagnostics. Machine Health Monitoring Group, Institute of Sound and Vibration Research, University of Southampton, Report MHM/R/10/77, July 1977.
FM4	Stewart, R.M. Some Useful Data Analysis Techniques for Gearbox Diagnostics. Machine Health Monitoring Group, Institute of Sound and Vibration Research, University of Southampton, Report MHM/R/10/77, July 1977.
M6A	Martin, H.R. Statistical Moment Analysis As a Means of Surface Damage Detection. Proceedings of the 7th International Modal Analysis Conference, Society for Experimental Mechanics, Schenectady, NY, 1989, pp. 1016-1021.
M8A	Martin, H.R. Statistical Moment Analysis As a Means of Surface Damage Detection. Proceedings of the 7th International Modal Analysis Conference, Society for Experimental Mechanics, Schenectady, NY, 1989, pp. 1016-1021.
NA4	Zakrajsek, J.J., Townsend, D.P., Decker, H.J. An Analysis of Gear Fault Detection Methods as Applied to Pitting Fatigue Failure Data. NASA Lewis Research Center/U.S. Army Aviation Systems Command. 47th Mechanical Failure Prevention Group, NASA TM 105950, AVSCOM TR 92-C-035, April 1993.
NA4*	Decker, H.J., Handschuh, R.F., Zakrajsek, J.J. An Enhancement to the NA4 Gear Vibration Diagnostic Parameter. U.S. Army Research Laboratory/NASA Glenn Research Center. 18th Annual Meeting of the Vibration Institute, NASA TM 106553, ARL-TR-389, June 1994.
NB4	Zakrajsek, J.J., Handschuh, R.F., Decker, H.J. Application of Fault Detection Techniques to Spiral Bevel Gear Fatigue Data. NASA Lewis Research Center/U.S. Army Research Laboratory 48th Mechanical Failures Prevention Group, Wakefield, Mass. April 1994. NASA TM 106467, ARL-TR-345
NB4*	Application of difference between NA4 and NA4* to NB4. No paper published.
NP4	Polyshchuk, V.V., Choy, F.K., Braun, M.J. Gear Fault Detection with Time-Frequency based Parameter NP4. Proceedings from the 8th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC-8), Honolulu, Hawaii, March 26-30, 2000.