Detection and diagnosis of ball bearing imperfections in reaction wheels by micro-vibration test

M.P. Le, E. Heide, van der, R. Seiler, E.J.E. Cottaar

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    Abstract

    The results of micro-vibration test contain information on unbalance level, torque ripples, and most importantly the bearing health status. In this paper, the envelop analysis technique is proposed for localizing imperfections in the bearing. The envelop analysis, which is a powerful method used in ball bearing fault diagnosis, is adapted to the micro-vibration data. This method analyzes the data around the structural resonance: through the amplification of the vibration smaller faults can be detected. The procedure of envelope analysis, its practical issues and robustness are validated with simulated signals. Finally, the envelope analysis is applied to diagnose and evaluate the change in bearing status throughout two environmental tests: sine vibration and full ECSS shock. The result of envelope analysis shows its high sensitivity in revealing the development of small imperfections, makes an initial step in reaction wheel condition monitoring (on-ground and in-flight) and provides insights in design improvement to further lower micro vibration levels of reaction wheels.
    Original languageEnglish
    Title of host publicationProceedings of the 12th European Conference on Spacecraft Structures, Materials & Environmental Testing, 20-23 March 2012, Noordwijk, The Netherlands
    Pages1-6
    Publication statusPublished - 2012
    Event12th European Conference on Spacecraft Structures, Materials & Environmental Testing (ECSSMET 2012)
    - ESTEC, Noordwijk, Netherlands
    Duration: 20 Mar 201223 Mar 2012
    Conference number: 12

    Conference

    Conference12th European Conference on Spacecraft Structures, Materials & Environmental Testing (ECSSMET 2012)
    Abbreviated titleECSSMET 2012
    CountryNetherlands
    CityNoordwijk
    Period20/03/1223/03/12
    Other

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