Monitoring the health of a helicopter drive train enhances flight safety and reduces operating costs. Health and Usage Management Systems (HUMS) monitor the drive train by using accelerometers to measure component vibration. Algorithms process the time domain vibration data into various condition indicators (CI), which are used to determine component health via thresholding. For the rotating machinery, a standard set of CI are shaft order one, two and three (i.e. 1, 2 or 3 times the shaft RPM). Shaft order one (SO1) is indicative of an unbalance, where as higher shaft order can be used to detect a bent shaft or misalignment condition. In the case of bearings, CIs are envelope spectrum or cepstrum analysis of the ball, cage, inner race and outer race frequencies. There are a number of standard CI used for gear analysis, such as line elimination and resynthesis, side band modulation, gear misalignment, etc. In general, some method is used to set thresholds for these CIs: when the threshold is exceeded, maintenance is recommended. The HUMS system must balance the risk of setting the threshold too high such that a component may fail in flight versus the risk of setting the threshold too low, which results in additional maintenance cost. This paper covers a generalized process of optimally setting threshold for CI and fusing the information into an Health Indicator. It can be shown that the distributions of CI for shaft magnitude and bearing envelop energy are Rayleigh distribution.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    A Generalized Process for Optimal Threshold Setting in HUMS


    Contributors:


    Publication date :

    2007-03-01


    Size :

    329775 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    HUMS Avionique Nouvelle

    Brand, E. / Tondre, P. | Tema Archive | 1998


    Eurocopter HUMS Concept

    Brand, E. / Farnault, B. / Deutsche Gesellschaft fur Luft-und Raumfahrt | British Library Conference Proceedings | 1995


    Israelischer Begleitpanzer HUMS

    Dt.Bundeswehr | Automotive engineering | 1984


    REAL TIME HUMS

    CIABURRI DANIEL A / ROZAK JAMES N | European Patent Office | 2022

    Free access

    HUMS for rotorcraft

    Ford, Terry | Emerald Group Publishing | 1996