Bicoherence analysis for condition assessment of multi-faulted helicopter drivetrain systems

Mohammed A. Hassan, David Coats, Yong June Shin, Abdel E. Bayoumi, Alexander Barry

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

3 Citations (Scopus)

Abstract

Traditional linear spectral analysis techniques of the vibration signals, based on auto-power spectrum, are used as common tools of rotating components diagnoses. Unfortunately, linear spectral analysis techniques are of limited value when various spectral components interact with one another due to nonlinear or parametric process. In such a case, higher order spectral (HOS) techniques are recommended to accurately and completely characterize the vibration signals. In this paper, we use the bicoherence analysis as a tool to investigate nonlinear wave-wave interaction in vibration signals. Accelerometer data has been collected from an AH-64 helicopter drive-train research test bed simulating drive-train conditions under multiple faulted components namely faulted inner race in one hanger bearing, contaminated grease in another hanger bearing, misaligned and unbalanced drive shafts. The proposed bicoherence analysis provides more details about the spectral content of the vibration signal and how different fault frequencies nonlinearly interact with one another.

Original languageEnglish
Title of host publication68th American Helicopter Society International Annual Forum 2012
Pages2326-2331
Number of pages6
Publication statusPublished - 2012 Aug 17
Event68th American Helicopter Society International Annual Forum 2012 - Fort Worth, TX, United States
Duration: 2012 May 12012 May 3

Publication series

NameAnnual Forum Proceedings - AHS International
Volume4
ISSN (Print)1552-2938

Other

Other68th American Helicopter Society International Annual Forum 2012
CountryUnited States
CityFort Worth, TX
Period12/5/112/5/3

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All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Hassan, M. A., Coats, D., Shin, Y. J., Bayoumi, A. E., & Barry, A. (2012). Bicoherence analysis for condition assessment of multi-faulted helicopter drivetrain systems. In 68th American Helicopter Society International Annual Forum 2012 (pp. 2326-2331). (Annual Forum Proceedings - AHS International; Vol. 4).