Helicopter transmission fault diagnostics and prognostics continue to receive a considerable amount of attention in the rotorcraft community. There are tens of gears in a modern helicopter and spur gears are widely used in the helicopter transmission system. Because of the harsh operation enviroment, they are susceptible to many kinds of damage. The most common mode of gear damage is bending fatigue crack. It is widely acknowledged that the conventional vibration-based damage detection methodologies have their limitations. For example, they can hardly detect an incipient crack and they are sensitive to the propagation of the crack either. This paper provides a novel approach to address the problems of an incipient crack as well as the tracking of the propagation of a gear crack on a spur gear. A new mechanical multifunctional dual-stiffness sensor for stiffness and energy density measurements was de veloped at the University of Maryland. The sensor has the ability to predit the elastic field of a given host structure based on the strain state of two strain sensors of different stiffness integrated into the structure. The sensor concept is used on a finite element model of a spur gear under quasi-static loading conditions. A crack model is developed and allowed to grow. The growth of this crack is tracked using the dual stiffness sensor. Experiment is carried out to verify the numerical simulations. Results illustrate that the sensor represents a promising approach for transmission health diagnostics and prognostics analysis.


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    Titel :

    A dual-stiffness-energy sensor for crack detection in spur gears


    Weitere Titelangaben:

    Ein dualer Steifigkeits-Energie-Sensor zur Rißprüfung in Geradzahnstirnradgetrieben


    Beteiligte:
    Wakha, C. (Autor:in) / Lin Liu (Autor:in) / Pines, Darryll J. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2004


    Format / Umfang :

    9 Seiten, 27 Bilder, 7 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    A Dual-Stiffness-Energy Sensor for Crack Detection in Spur Gears

    Wakha, C. / Liu, L. / Pines, D. J. et al. | British Library Conference Proceedings | 2004


    CRACK DETECTION FOR AEROSPACE QUALITY SPUR GEARS

    Decker, H. J. / American Helicopter Society | British Library Conference Proceedings | 2002


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    Marsh, G.R. | Engineering Index Backfile | 1930


    Mesh stiffness and transmission error of spur and helical gears

    Choi,M. / David,J.W. / North Carolina State Univ.,US | Kraftfahrwesen | 1990


    Natural Fatigue Crack Initiation and Detection in High Quality Spur Gears

    Stringer, D. / Laberge, K. / Burdick, C. et al. | British Library Conference Proceedings | 2012