The research investigated the enhancement of early detection of gear and bearing problems in helicopter gearboxes. Additional considerations were the applicability of these improvements to routine helicopter maintenance and/or an additional aid for in-flight readiness. The selected research dealt with the processing of acceleration data collected from a Navy TH-1L helicopter test bed. The aircraft was strapped down with the main rotor removed for safety reasons and the tail rotor left on to load the 42 degree gearbox being investigated. The signal processing research dealt principally with the potential improvements to be gained by utilizing the complex and cosine squared cepstrum techniques. Considerable apparent gains in performance were achieved by a combination of the traditional and unique employments of these cepstral techniques.


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    Title :

    Applications of Vibration Analysis to Helicopter Gearbox Health Assessment


    Contributors:
    R. C. Kemerait (author) / G. W. Pound (author) / L. J. Owiesny (author) / R. H. Kimmel (author)

    Publication date :

    1986


    Size :

    91 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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