Observations of a naturally degrading slow-speed shaft

M. Elforjani, D. Mba, B. Charnley

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)


    Acoustic emission (AE) technology applied to condition monitoring is gaining acceptance as a useful monitoring tool. This study presents an experimental investigation for incipient fault detection of low-speed shafts with the AE technology. In addition to continuous AE measurements, traditional AE parameters, the energy index, kurtosis, information entropy and Kolmogorov-Smirnov test were employed to detect and monitor natural defect initiation and propagation in slow-speed rotating shafts. A low-speed test-rig was employed to accelerate natural shaft breakage. Throughout the life of the shaft, AE measurements were acquired. It is concluded that crack initiation and subsequent fracture can be detected using a range of data analysis techniques on AEs generated from natural degrading shafts.

    Original languageEnglish
    Pages (from-to)267-278
    Number of pages12
    JournalNondestructive Testing and Evaluation
    Issue number4
    Publication statusPublished - 2 Jun 2010


    • acoustic emission
    • condition monitoring
    • energy index
    • information entropy and Kolmogorov-Smirnov test
    • kurtosis
    • natural breakage and slow-speed shafts


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