Nonlinear vibration-interaction metric for health assessment of helicopter drivetrain systems

Mohammed A. Hassan, Yong June Shin, Abdel E. Bayoumi, Joshua Tarbutton, Les Eisner, Jerry Higman

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, concept of cross-bispectrum is used to investigate and model vibration interaction due to nonlinearities in faulted drive shafts in an AH-64 helicopter. Most of the currently available vibration-monitoring tools are built around auto- and cross-power spectral analyses which have limited value in detecting frequency correlations higher than first order. Studying higher order correlations provides more information about the mechanical system which helps in building more accurate diagnostic model using the same collected vibration data. Based on cross-bispectrum as higher order spectral analysis, health conditions of rotating shafts are assessed by studying quadratic nonlinear correlation between two vibration signals collected at the bearing supporting the shafts. Vibration data are gathered from dedicated condition based maintenance experimental helicopter drive-train simulating different shaft conditions, namely; baseline case, shaft misalignment, shaft imbalance, and combination of misalignment and imbalance. For each of these settings, the experiment is repeated three times using different hanger bearing articles, making a grand total of twelve experiment runs. This work is targeting the development of health indicators based on higher order spectra (HOS) for more effective condition based maintenance (CBM) programs.

Original languageEnglish
Title of host publicationAmerican Helicopter Society International - Airworthiness, CBM and HUMS Specialists' Meeting 2013
Pages207-214
Number of pages8
Publication statusPublished - 2013 Dec 12
EventAirworthiness, CBM and HUMS Specialists' Meeting 2013 - Huntsville, AL, United States
Duration: 2013 Feb 112013 Feb 13

Publication series

NameAmerican Helicopter Society International - Airworthiness, CBM and HUMS Specialists' Meeting 2013

Other

OtherAirworthiness, CBM and HUMS Specialists' Meeting 2013
CountryUnited States
CityHuntsville, AL
Period13/2/1113/2/13

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

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  • Cite this

    Hassan, M. A., Shin, Y. J., Bayoumi, A. E., Tarbutton, J., Eisner, L., & Higman, J. (2013). Nonlinear vibration-interaction metric for health assessment of helicopter drivetrain systems. In American Helicopter Society International - Airworthiness, CBM and HUMS Specialists' Meeting 2013 (pp. 207-214). (American Helicopter Society International - Airworthiness, CBM and HUMS Specialists' Meeting 2013).