A comparison between stationary statistical fault indicators and the discrete harmonic wavelet packet transform (DHWPT) is investigated for accelerometer vibration data obtained from the OH-58A main rotor transmission. This transmission is comprised of two stages, a spiral bevel input stage and a planetary stage, resulting in an overall reduction of 17.44:1. Vibration data from a load-to-failure transmission test is used to evaluate the sensitivity of previously developed stationary fault metrics and a new non-stationary fault metric for early fault detection. The non-stationary fault indicator consists of a normalized energy metric which was developed to quantify the redistribution of sideband energy about the dominant mesh frequency and its harmonics in the presence of actual gearbox faults. This metric is used to qualitatively assess the presence, type and location of gearbox faults. Gearbox faults considered in this study include sun gear spalling and spiral bevel gear scoring. Results from the comparison suggest that the non-stationary normalized energy metric is capable of detecting damage at a rate that is comparable to the stationary statistical fault indicators. In addition, the normalized energy metric provides more information about the nature of a fault.


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    Title :

    A comparison of stationary and non-stationary metrics for detecting faults in helicopter gearboxes


    Additional title:

    Vergleich der stationären und instationären Metrik zur Fehlererkennung in Hubschraubgetrieben


    Contributors:
    Samuel, P.D. (author) / Pines, D.J. (author) / Lewicki, D.G. (author)

    Published in:

    Publication date :

    2000


    Size :

    12 Seiten, 11 Bilder, 3 Tabellen, 34 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English






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