Fatigue cracks of considerable length were discovered in two separate main transmissions planetary gear carrier plates of U.S. Army helicopters. These cracks originated at the blend between the gear post and the plate and later diagnosed as low cycle fatigue. Cracks on the planet carrier plate are a very serious but rare type of fault that may require the redesign of this critical part. In this paper, an investigation of the problem is attempted using experimental data from ground and aircraft tests. Two features based on the signal energy are used to distinguish the faulty from the healthy plate using the signals from four one-dimensional accelerometers. A data analysis based on the time synchronous averaging signal transformation, tends to indicate that besides any machining error or material fault that may have initiated the crack, there is evidence of a non-rotating fault. A possible explanation of this fault is a deformation of the ring gear, or a considerable non-uniform distribution of forces among the planet gears that may have been generated by the presence of the crack and or may have promoted its rapid development.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    A helicopter planetary gear carrier plate crack analysis and feature extraction based on ground and aircraft tests


    Contributors:


    Publication date :

    2005


    Size :

    6 Seiten, 4 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Nonlinear dynamic modeling of a helicopter planetary gear train for carrier plate crack fault diagnosis

    Fan, Lei / Wang, Shaoping / Wang, Xingjian et al. | Elsevier | 2016

    Free access

    Life prediction of helicopter planetary carrier plate fatigue crack propagation

    Fan, Lei / Wang, Shaoping / Zhang, Chao et al. | British Library Online Contents | 2016



    CARRIER HELICOPTER-AMPHIBIOUS AIRCRAFT

    DUROV DMITRIJ SERGEEVICH | European Patent Office | 2018

    Free access

    Determination of the Crack Propagation Life of a Planetary Gear Carrier

    Sahrmann, G. J. / American Helicopter Society | British Library Conference Proceedings | 2004