Abstract
Anewgear-fault-detectionparametercalledNP4 isintroduced.Thisfault-detectionparameterutilizestheproperties of the joint time ‐frequency analysis given by the Wigner ‐Ville distribution (WVD) and kurtosis. With the WVD, the instantaneous power of the gear-vibration signature for one complete rotor revolution can be obtained. The presence of single-gear-tooth damage can be manifested by the existence of an instantaneous power distribution with a peakedness larger than the normal distribution. The normalized kurtosis, a fourth-order statistical parameter calculated for the instantaneous power distribution, provides the gear-fault-detection parameter NP4. The developed fault-detection parameter NP4 is sensitive to gear-tooth damage, especially for damage in a single tooth. The application of this NP4 fault-detection parameter was demonstrated by experimental data obtained from a gear test rig. The results showed that the NP4 parameter, used with the WVD, can provide an accurate fault identie cation of gear-tooth damage. The parameter NP4 would be of help to the practitioners in the e eld of machine health monitoring.
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