Measuring and testing – Vibration – By mechanical waves
Reexamination Certificate
2005-05-31
2005-05-31
Williams, Hezron (Department: 2856)
Measuring and testing
Vibration
By mechanical waves
Reexamination Certificate
active
06898975
ABSTRACT:
In the method of detecting a localized sun gear fault, in the operation of an epicyclic gear train having ring, planet and sun gears, and a planet carrier, the steps that include detecting sun gear vibrations transmitted through each planet gear, computing separated averages of such detected vibrations, phase shifting the averages to account for the differences in gear meshing positions, and re-combining the phase shifted averages to produce a modified average value of the sun gear vibration.
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Forrester, B.D. “A Method for the Separation of Epicyclic Planet Gear Vibration Signatures”, Proceedings of the Third International Conference on Vibratory Surveillance Methods and Diagnostic Techniques, Senlis, France, Oct. 12th-15th, 1998.*
Howard, I. M., “An Investigation of Vibration Signal Averaging of Individual Components in an Epicyclic Gearbox”, DSTO ARL Propulsion Report 185, ARL-PROP-R-185, AR-006-147, Jun. 1991.*
McFadden, P.D. and Howard, L.M., “The Detection of Seeded Faults in an Epicyclic Gearbox by Signal Averaging of the Vibration”, DSTO ARL Propulsion Report 183, ARL-ROP-R-183, AR-006-087, Oct. 1990.*
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Haefliger William W.
Miller Rose M.
The Defence Science and Technology Organization of the Departmen
Williams Hezron
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